JP2848242B2 - High frequency heating element with catalytic function - Google Patents
High frequency heating element with catalytic functionInfo
- Publication number
- JP2848242B2 JP2848242B2 JP6116601A JP11660194A JP2848242B2 JP 2848242 B2 JP2848242 B2 JP 2848242B2 JP 6116601 A JP6116601 A JP 6116601A JP 11660194 A JP11660194 A JP 11660194A JP 2848242 B2 JP2848242 B2 JP 2848242B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- catalyst
- heating element
- ceramic
- catalytic function
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title claims description 57
- 230000003197 catalytic effect Effects 0.000 title claims description 39
- 239000003054 catalyst Substances 0.000 claims description 90
- 239000000919 ceramic Substances 0.000 claims description 58
- 239000006096 absorbing agent Substances 0.000 claims description 49
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 239000010419 fine particle Substances 0.000 claims description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000010941 cobalt Substances 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- 239000010948 rhodium Substances 0.000 claims description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 2
- 150000001247 metal acetylides Chemical class 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910001111 Fine metal Inorganic materials 0.000 claims 1
- 239000002923 metal particle Substances 0.000 claims 1
- 229910003450 rhodium oxide Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 44
- 239000010410 layer Substances 0.000 description 33
- 229930195733 hydrocarbon Natural products 0.000 description 13
- 150000002430 hydrocarbons Chemical class 0.000 description 13
- 238000000746 purification Methods 0.000 description 13
- 239000011230 binding agent Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000002002 slurry Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002759 woven fabric Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- FMIAYBZNPVVAAF-UHFFFAOYSA-N [O].[Ti].[C].[Si] Chemical compound [O].[Ti].[C].[Si] FMIAYBZNPVVAAF-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- -1 iron-chromium-aluminum Chemical compound 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910003445 palladium oxide Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Catalysts (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は高周波エネルギを利用し
て加熱・昇温させ、自動車などの内燃機関から排出され
る排気ガス中の炭化水素、一酸化炭素などの有害物質を
触媒的に分解する高周波発熱体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses high-frequency energy to heat and raise the temperature to catalytically decompose harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged from internal combustion engines such as automobiles. The present invention relates to a high-frequency heating element.
【０００２】[0002]
【従来の技術】ガソリンを燃料とする自動車は排気ガス
中に含まれる炭化水素、一酸化炭素、窒素酸化物の排出
規制が強化される動きにある。これら汚染物質の浄化方
法の一つとして触媒による後処理方式があり、代表的な
触媒としては空燃比を理論空燃比付近に制御することに
より炭化水素、一酸化炭素の酸化と窒素酸化物の還元を
同時に行い、無害な炭酸ガス、水蒸気、窒素に変換する
触媒体（三元触媒）がある。2. Description of the Related Art In automobiles that use gasoline as fuel, there is a movement to tighten regulations on the emission of hydrocarbons, carbon monoxide, and nitrogen oxides contained in exhaust gas. One of the purification methods of these pollutants is a post-treatment system using a catalyst. A typical catalyst is to control the air-fuel ratio to near the stoichiometric air-fuel ratio to oxidize hydrocarbons and carbon monoxide and reduce nitrogen oxides. At the same time, there is a catalytic body (three-way catalyst) that converts it into harmless carbon dioxide, water vapor, and nitrogen.
【０００３】この触媒体はシリカ、アルミナ、マグネシ
アを主成分とするコーディエライトの３００〜４００ce
ll／inch2のモノリス担体、または鉄−クロム−アルミ
ニウム系合金をコルゲート加工した金属製の担体（メタ
ル担体と呼ばれている）に、表面積の大きいアルミナな
どの微粒子からなるウォッシュコートと呼ばれるコーテ
ィング層、もしくは前記メタル担体の酸化被膜層を設
け、このコーティング層もしくは酸化被膜層に白金、パ
ラジウム、ロジウムなどの貴金属微粒子を担持して構成
されており、触媒機能は排気ガスの加熱によって発揮さ
れる。[0003] This catalyst is made of cordierite having a main component of silica, alumina and magnesia of 300 to 400 ce.
ll / inch 2 monolithic carrier, or a metallic carrier (called a metal carrier) obtained by corrugating an iron-chromium-aluminum-based alloy, and a coating layer called a wash coat composed of fine particles such as alumina having a large surface area Alternatively, an oxide film layer of the metal carrier is provided, and the coating layer or the oxide film layer carries fine particles of noble metal such as platinum, palladium, and rhodium. The catalytic function is exerted by heating the exhaust gas.
【０００４】また最近では触媒機能を短時間で発揮させ
るため、前記メタル担体に直接電流を流し、触媒体を急
速加熱する電気ヒータ方式が検討されている。Recently, an electric heater system has been studied in which an electric current is directly applied to the metal carrier to rapidly heat the catalyst body in order to exert a catalytic function in a short time.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら従来の触
媒体の構成では、触媒機能を発揮させるには触媒層の温
度が３５０℃以上を必要とし、排気ガスのみによって加
熱される場合は前述の触媒として機能する温度に到達す
るのに約１分を要し、それまでは有害な排気ガスがその
まま大気へ排出されるという課題があった。However, in the structure of the conventional catalyst body, the temperature of the catalyst layer needs to be 350 ° C. or higher in order to exert the catalytic function. It took about one minute to reach a functional temperature, and until then, there was a problem that harmful exhaust gas was directly discharged to the atmosphere.
【０００６】またメタル担体に通電して急速に加熱する
ヒータ方式の触媒体は排気ガスのみによって加熱される
触媒体に比べ、昇温スピードが改善されるがメタル担体
の熱容量が大きいので極めて短時間で昇温させるには大
電力を必要とするという課題があるとともに、電気的絶
縁など信頼性に欠けるという課題がある。[0006] A heater-type catalyst body that heats rapidly by energizing a metal carrier improves the temperature rising speed as compared with a catalyst body that is heated only by exhaust gas. In addition to the problem that large power is required to raise the temperature, there is a problem that reliability such as electrical insulation is lacking.
【０００７】本発明は上記課題を解決するもので、高周
波加熱を利用し、自動車などのエンジン始動時に排出さ
れる排気ガス中の有害物質である炭化水素や一酸化炭素
を低減する触媒機能を有する高周波発熱体の提供を目的
としたものである。The present invention solves the above-mentioned problems, and has a catalytic function of reducing harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged when starting an engine of an automobile or the like by using high-frequency heating. It is intended to provide a high-frequency heating element.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明の触媒機能を有する高周波発熱体はセラミッ
ク多孔体に高周波エネルギを吸収し発熱する高周波吸収
層を形成してなる高周波吸収体と、複数のセラミック繊
維からなる支持体にセラミック微粒子からなる担体層を
形成するとともに前記担体層に触媒を担持してなる触媒
体とから構成している。In order to achieve the above object, a high-frequency heating element having a catalytic function according to the present invention comprises a high-frequency absorbing layer formed by absorbing a high-frequency energy and generating heat in a porous ceramic body. And a catalyst body in which a carrier layer made of ceramic fine particles is formed on a support made of a plurality of ceramic fibers and a catalyst is carried on the carrier layer.
【０００９】また本発明の触媒機能を有する高周波発熱
体は高周波エネルギを吸収し発熱するセラミック多孔体
からなる高周波吸収体と、複数のセラミック繊維からな
る支持体にセラミック微粒子からなる担体層を形成する
とともに前記担体層に触媒を担持してなる触媒体とから
構成している。The high-frequency heating element having a catalytic function according to the present invention comprises a high-frequency absorber made of a porous ceramic body that absorbs high-frequency energy and generates heat, and a carrier layer made of ceramic fine particles on a support made of a plurality of ceramic fibers. And a catalyst body having a catalyst supported on the carrier layer.
【００１０】[0010]
【作用】上記構成において、本発明の触媒機能を有する
高周波発熱体（高周波吸収体と触媒体）に高周波エネル
ギが給電されると、前記高周波吸収体は高周波エネルギ
を吸収し、発熱する。同時に前記高周波吸収体に隣接し
て配置されている触媒体が触媒として機能する温度に加
熱され、自動車などから排出される排気ガス中の一酸化
炭素や炭化水素は加熱された触媒によって無害な炭酸ガ
スと水蒸気に変換され大気へ排出される。In the above configuration, when high-frequency energy is supplied to the high-frequency heating element having the catalytic function of the present invention (the high-frequency absorbing element and the catalytic element), the high-frequency absorbing element absorbs the high-frequency energy and generates heat. At the same time, the catalyst disposed adjacent to the high frequency absorber is heated to a temperature at which it functions as a catalyst, and carbon monoxide and hydrocarbons in exhaust gas discharged from automobiles and the like are converted into harmless carbon dioxide by the heated catalyst. It is converted to gas and water vapor and released to the atmosphere.
【００１１】前記高周波吸収体はその骨格がセラミック
多孔体で構成されているので軽量となり、熱容量を小さ
くすることができる。したがって高周波エネルギによる
急速加熱が可能となり、前記高周波吸収体を短時間で高
温に昇温させることができる。Since the high-frequency absorber has a skeleton made of a porous ceramic body, it is light in weight and can have a small heat capacity. Therefore, rapid heating by high-frequency energy becomes possible, and the high-frequency absorber can be heated to a high temperature in a short time.
【００１２】さらに前記高周波吸収体に隣接して配置さ
れている触媒体はその骨格がセラミック繊維で構成され
ているので従来の触媒体に比べ軽量となり、熱容量を小
さくすることができる。したがって前記触媒体は前記高
周波吸収体によって発生した熱を受けて短時間で触媒と
して機能する温度に昇温し、触媒機能を発揮することが
できる。Further, the catalyst body disposed adjacent to the high-frequency absorber has a skeleton made of ceramic fibers, so that it is lighter in weight and can have a smaller heat capacity than a conventional catalyst body. Therefore, the catalyst body receives the heat generated by the high-frequency absorber and heats up to a temperature at which it functions as a catalyst in a short time, so that the catalyst function can be exhibited.
【００１３】[0013]
【実施例】以下、本発明の実施例を添付図面を参照して
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１４】図１、図２は本発明の一実施例である触媒
機能を有する高周波発熱体の一部断面図を示している。
図１（ａ）において、１は高周波吸収体でありセラミッ
ク多孔体２に高周波エネルギを吸収して発熱する高周波
吸収材料からなる高周波吸収層３が形成されている。セ
ラミック多孔体２は同図（ｂ）に示すように均一な連続
気孔を有する三次元網状の骨格構造を有している。また
図２（ａ）において、４は触媒体であり、複数のセラミ
ック繊維からなる支持体５に比表面積を拡大するセラミ
ック微粒子からなる担体層６が形成され、さらに担体層
６には排気ガス中の有害物質を分解する触媒７が担持さ
れている。本発明の触媒機能を有する高周波発熱体は高
周波吸収体１と触媒体４の両者で構成される。図２
（ｂ）は複数のセラミック繊維からなる支持体５の一部
断面図であり、支持体５は複数のセラミック繊維８を集
束して得られる撚糸によって構成されている。同図
（ｃ）、（ｄ）は支持体５が同図（ｂ）で示した撚糸の
偏織品で構成されたものを示しており、支持体５は実用
的には前記偏織品を用いることが望ましい。同図
（ｃ）、（ｄ）は平織の例を示しているが、朱子織、か
らみ織、ブレード、ロープ、テープなど各種の織り方が
可能である。また、上記織布ではなく、ペーパーやマッ
トなどの不織布も適用できる。FIGS. 1 and 2 are partial sectional views of a high-frequency heating element having a catalytic function according to an embodiment of the present invention.
In FIG. 1A, reference numeral 1 denotes a high-frequency absorber, and a high-frequency absorbing layer 3 made of a high-frequency absorbing material that absorbs high-frequency energy and generates heat is formed on a porous ceramic body 2. The ceramic porous body 2 has a three-dimensional net-like skeleton structure having uniform continuous pores as shown in FIG. In FIG. 2 (a), reference numeral 4 denotes a catalyst, and a carrier layer 6 made of ceramic fine particles having an increased specific surface area is formed on a support body 5 made of a plurality of ceramic fibers. A catalyst 7 for decomposing harmful substances is supported. The high-frequency heating element having a catalytic function of the present invention is composed of both the high-frequency absorber 1 and the catalyst 4. FIG.
(B) is a partial cross-sectional view of a support 5 made of a plurality of ceramic fibers, and the support 5 is formed of a twisted yarn obtained by bundling a plurality of ceramic fibers 8. FIGS. 6C and 6D show a structure in which the support 5 is composed of the untwisted twisted yarn shown in FIG. 6B, and the support 5 is practically the unwoven fabric. Is desirable. FIGS. 3C and 3D show examples of plain weave, but various weaves such as satin weave, leno weave, blade, rope, and tape are possible. Further, nonwoven fabric such as paper and mat can be applied instead of the above woven fabric.
【００１５】セラミック多孔体２はポリウレタンなどの
有機質の多孔体（例えばポリウレタンフォーム）を基材
としこれにセラミック材料をコーティングし、焼成して
得られるものであり、このセラミック材料としては耐熱
性、機械的強度に優れたアルミナ、シリカ、マグネシ
ア、ジルコニアの少なくとも１種が適用される。The porous ceramic body 2 is obtained by coating an organic porous body such as polyurethane (for example, polyurethane foam) as a base material with a ceramic material and firing the ceramic material. At least one of alumina, silica, magnesia, and zirconia having excellent mechanical strength is applied.
【００１６】高周波吸収層３を形成する材料としては高
周波吸収特性に優れた半導体材料が挙げられ、特に亜
鉛、銅、マンガン、コバルト、鉄、スズ、チタン、ケイ
素を主成分とする酸化物、炭化物、前記金属を含むペロ
ブスカイト型複合酸化物などの複合酸化物の少なくとも
１種からなるものが適用される。上記半導体材料が高周
波エネルギの吸収・発熱特性に優れている理由は上記半
導体材料が高周波の吸収に適した導電特性、誘電特性を
有していることが考えられる。特に高周波吸収材料とし
て炭化ケイ素を適用することにより、より優れた高周波
エネルギの吸収・発熱特性と排気ガス雰囲気下での耐熱
性、化学的安定性を実現することができる。 セラミッ
ク繊維８は耐熱性に優れたセラミック材料が望ましく、
特にアルミナ、シリカ、ジルコニアの少なくとも１種が
適用される。As a material for forming the high-frequency absorption layer 3, a semiconductor material having excellent high-frequency absorption characteristics can be mentioned, and in particular, oxides, carbides containing zinc, copper, manganese, cobalt, iron, tin, titanium and silicon as main components. A material composed of at least one complex oxide such as a perovskite complex oxide containing the metal is applied. The reason that the semiconductor material is excellent in high frequency energy absorption and heat generation characteristics is considered to be that the semiconductor material has conductive properties and dielectric properties suitable for high frequency absorption. In particular, by applying silicon carbide as the high-frequency absorbing material, more excellent high-frequency energy absorption / heating characteristics, heat resistance in an exhaust gas atmosphere, and chemical stability can be realized. The ceramic fiber 8 is desirably a ceramic material having excellent heat resistance.
In particular, at least one of alumina, silica and zirconia is applied.
【００１７】支持体５に形成される担体層６は担持され
る触媒７の分散性を向上させ、触媒活性を高くするため
（比表面積の拡大）のものであり、その材料としては耐
熱性に優れたシリカ、アルミナ、ジルコニア、セリアの
少なくとも１種を主成分とするセラミック微粒子が適用
される。The carrier layer 6 formed on the support 5 is for improving the dispersibility of the supported catalyst 7 and for increasing the catalytic activity (enlarging the specific surface area). Ceramic fine particles mainly composed of at least one of silica, alumina, zirconia, and ceria are used.
【００１８】有害物質を分解する触媒７としては白金、
パラジウム、ロジウムの貴金属、銅、マンガン、コバル
トの酸化物、ペロブスカイト型複合酸化物が挙げられ、
これらの少なくとも１種が適用される。Platinum is used as the catalyst 7 for decomposing harmful substances.
Palladium, noble metals of rhodium, copper, manganese, oxides of cobalt, perovskite-type composite oxides,
At least one of these applies.
【００１９】担体層６は任意の形に構成された支持体５
に形成されることが望ましいが、支持体５を構成する各
々のセラミック繊維８またはセラミック繊維８よりなる
撚糸に予め形成することも可能である。The carrier layer 6 comprises a support 5 having an arbitrary shape.
However, it is also possible to form in advance the ceramic fibers 8 constituting the support 5 or the twisted yarns made of the ceramic fibers 8.
【００２０】なお、セラミック多孔体２と高周波吸収層
３を構成する高周波吸収材料、およびセラミック支持体
５と担体層６を構成するセラミック微粒子は無機質バイ
ンダで接着され、また触媒７は前記無機質バインダによ
る接着もしくは触媒溶液の浸漬・乾燥処理により担持さ
れる。また無機質バインダは特に限定されるものではな
いが、耐熱性、接着性に優れたアルミナ、シリカ、ジル
コニアなどのコロイド粒子のものがよい。The high-frequency absorbing material forming the porous ceramic body 2 and the high-frequency absorbing layer 3 and the fine ceramic particles forming the ceramic support 5 and the carrier layer 6 are adhered with an inorganic binder, and the catalyst 7 is formed of the inorganic binder. It is carried by adhesion or immersion and drying treatment of the catalyst solution. The inorganic binder is not particularly limited, but is preferably a colloidal particle of alumina, silica, zirconia or the like having excellent heat resistance and adhesiveness.
【００２１】高周波吸収体１は次のようにして製造され
る。高周波吸収材料に無機質バインダと溶媒（通常は
水）からなるスラリーを作製し、このスラリーにセラミ
ック多孔体２を浸漬するか、もしくは前記スラリーをセ
ラミック多孔体２に刷毛塗りやスプレーなどの方法によ
り塗布し、高周波吸収材料と無機質バインダを付着させ
て高周波吸収層３を形成した後、乾燥もしくは焼成す
る。前記スラリーの組成は必要とする高周波吸収材料の
付着量や接着力を保持できる無機質バインダ量、浸漬処
理の際の作業などによって適宜設定される。The high-frequency absorber 1 is manufactured as follows. A slurry composed of an inorganic binder and a solvent (usually water) is prepared in the high frequency absorbing material, and the ceramic porous body 2 is immersed in the slurry, or the slurry is applied to the ceramic porous body 2 by brushing or spraying. Then, after the high-frequency absorbing material and the inorganic binder are attached to form the high-frequency absorbing layer 3, drying or firing is performed. The composition of the slurry is appropriately set depending on the amount of the required high frequency absorbing material to be adhered, the amount of the inorganic binder capable of maintaining the adhesive strength, the operation during the immersion treatment, and the like.
【００２２】一方触媒体４は次のようにして製造され
る。シリカ、アルミナなどのセラミック微粒子と無機質
バインダと溶媒（通常は水）をからなるスラリーを作製
し、このスラリーに支持体５を浸漬するか、もしくは前
記スラリーを持体５に刷毛塗りやスプレーなどの方法に
より塗布しセラミック微粒子からなる担体層６を形成し
た後、乾燥もしくは焼成する。次に金属からなる触媒
７、もしくは触媒７を含む金属化合物を分散（または溶
解）させた触媒溶液を作製し、この触媒溶液中に上記の
担体層６を形成した支持体５を浸漬するか、もしくは前
記触媒溶液をスプレーなどにより担体層６に塗布した
後、乾燥もしくは焼成する。また触媒７は予め前述のセ
ラミック微粒子と無機質バインダと溶媒とからなるスラ
リーに所定量を加えておき、担体層６の形成と同時に触
媒７を担持してもよい。なお、触媒７が金属酸化物であ
る場合、触媒の担持は次のように行われる。触媒７と無
機質バインダと溶媒からなるスラリーを作製し、このス
ラリーに支持体５を浸漬するか、もしくは刷毛塗りやス
プレーにより塗布した後、乾燥もしくは焼成する。On the other hand, the catalyst body 4 is manufactured as follows. A slurry comprising ceramic fine particles such as silica and alumina, an inorganic binder and a solvent (usually water) is prepared, and the support 5 is immersed in the slurry, or the slurry is applied to the carrier 5 by brushing or spraying. After coating by a method to form a carrier layer 6 made of ceramic fine particles, drying or firing is performed. Next, a catalyst solution is prepared by dispersing (or dissolving) a metal catalyst 7 or a metal compound containing the catalyst 7, and the support 5 on which the carrier layer 6 is formed is immersed in the catalyst solution, Alternatively, the catalyst solution is applied to the carrier layer 6 by spraying or the like, and then dried or fired. Alternatively, a predetermined amount of the catalyst 7 may be added in advance to a slurry composed of the above-mentioned ceramic fine particles, an inorganic binder, and a solvent, and the catalyst 7 may be supported simultaneously with the formation of the carrier layer 6. When the catalyst 7 is a metal oxide, the loading of the catalyst is performed as follows. A slurry composed of the catalyst 7, the inorganic binder and the solvent is prepared, and the support 5 is immersed in the slurry or applied by brushing or spraying, and then dried or fired.
【００２３】次に本発明の触媒機能を有する高周波発熱
体の作用と効果について、排ガス浄化装置を一例に挙げ
説明する。Next, the function and effect of the high-frequency heating element having a catalytic function of the present invention will be described with reference to an exhaust gas purifying apparatus as an example.
【００２４】図３は本発明の高周波吸収体１と触媒体４
で構成される触媒機能を有する高周波発熱体９を配置し
た自動車から排出される排気ガスを浄化する装置の一例
を示すものである。同図において、１０は内燃機関の排
気ガスを排出する排気管、１１は排気管の途中に設けら
れた加熱室であり、本発明の触媒機能を有する高周波発
熱体９は加熱室１１に収納される。このとき前記触媒機
能を有する高周波発熱体９は排気ガスの流れに対し前流
側に高周波吸収体１、後流側に触媒体４となるように配
置されている。１２は加熱室１１に収納される触媒機能
を有する高周波発熱体９を支持するための支持部材であ
り、この支持部材１２は前記触媒機能を有する高周波発
熱体９の外周と加熱室１１の内壁との間の断熱機能も兼
ねている。１３は加熱室１１に給電する高周波エネルギ
を発生させる高周波発振器、１４は高周波発振器１３か
ら発生した高周波エネルギを加熱室１１に伝送する導波
管である。１５、１６は加熱室１１を限定する高周波遮
蔽手段であり、多数のパンチング孔を有する金属板ある
いは多数の貫通孔を有する金属のハニカム構造体から
構成される。FIG. 3 shows the high-frequency absorber 1 and the catalyst 4 of the present invention.
1 shows an example of a device for purifying exhaust gas discharged from an automobile in which a high-frequency heating element 9 having a catalytic function constituted by the above is disposed. In FIG. 1, reference numeral 10 denotes an exhaust pipe for discharging exhaust gas of an internal combustion engine, 11 denotes a heating chamber provided in the middle of the exhaust pipe, and a high-frequency heating element 9 having a catalytic function of the present invention is housed in the heating chamber 11. You. At this time, the high-frequency heating element 9 having the catalytic function is disposed so as to be the high-frequency absorber 1 on the upstream side of the exhaust gas flow and the catalyst body 4 on the downstream side. Reference numeral 12 denotes a support member for supporting the high-frequency heating element 9 having a catalytic function, which is accommodated in the heating chamber 11. The supporting member 12 includes an outer periphery of the high-frequency heating element 9 having the catalytic function and an inner wall of the heating chamber 11. It also has a thermal insulation function between the two. Reference numeral 13 denotes a high-frequency oscillator that generates high-frequency energy to supply power to the heating chamber 11, and 14 denotes a waveguide that transmits high-frequency energy generated by the high-frequency oscillator 13 to the heating chamber 11. Reference numerals 15 and 16 denote high-frequency shielding means for limiting the heating chamber 11, which is made of a metal plate having many punching holes or a metal honeycomb structure having many through holes.
Be composed.
【００２５】ガソリン車のエンジンが始動すると、エン
ジンから排出された一酸化炭素や炭化水素などの有害物
質を含む排気ガスは排気管１０を通り、触媒機能を有す
る高周波発熱体９に流入する。一方、エンジン始動と同
時にあるいはエンジン始動直前に高周波発振器１３が制
御部（図示せず）からの指令により高周波エネルギを発
生させる。この高周波エネルギは導波管１４を伝送して
加熱室１１に給電されると、高周波吸収体１によって吸
収され（実際にはセラミック多孔体２に形成されている
高周波吸収層３）、熱に変換される。同時に高周波吸収
体１の排気ガスの流れに対し後方に隣接して配置されて
いる触媒体４が高周波吸収体１からの熱伝達によって加
熱される。そして触媒体４の担体層６に担持されている
触媒７が触媒として機能する温度に到達すると、排気ガ
ス中の有害物質である一酸化炭素や炭化水素は排気ガス
中に含まれる酸素との反応が起こり無害である水蒸気と
炭酸ガスに分解される。この無害となった排気ガスはマ
フラーを通過して排気管１０より大気に排出される。When the engine of a gasoline-powered vehicle starts, exhaust gas containing harmful substances such as carbon monoxide and hydrocarbons discharged from the engine passes through an exhaust pipe 10 and flows into a high-frequency heating element 9 having a catalytic function. On the other hand, at the same time as or immediately before the start of the engine, the high-frequency oscillator 13 generates high-frequency energy according to a command from a control unit (not shown). When this high-frequency energy is transmitted to the heating chamber 11 through the waveguide 14, it is absorbed by the high-frequency absorber 1 (actually, the high-frequency absorption layer 3 formed on the ceramic porous body 2) and converted into heat. Is done. At the same time, the catalyst 4 disposed adjacent to and behind the flow of the exhaust gas of the high frequency absorber 1 is heated by the heat transfer from the high frequency absorber 1. When the temperature of the catalyst 7 supported on the carrier layer 6 of the catalyst body 4 reaches a temperature at which it functions as a catalyst, carbon monoxide and hydrocarbons, which are harmful substances in the exhaust gas, react with oxygen contained in the exhaust gas. Occurs and is decomposed into harmless steam and carbon dioxide gas. This harmless exhaust gas passes through the muffler and is exhausted to the atmosphere through the exhaust pipe 10.
【００２６】（実施例１）セラミック多孔体２としてア
ルミナ、シリカ、マグネシアからなる成形体（直径８０
mm、容積５０cc、２５cell/inch2）と、高周波吸収層３
を構成する高周波吸収材料として炭化ケイ素ウィスカー
を用い、高周波吸収体１を作製した。また支持体５とし
て直径１５μmのシリカの連続繊維を１０００本集束し
た撚糸を縦糸、横糸ともに１０本（撚糸）/inch2の打ち
込み数で平織された織布（直径８０mm）と、担体層６を
構成するセラミック微粒子としてアルミナと、有害物質
を分解する触媒７として白金を用い、触媒体４を作製し
た。なお、無機質バインダとしてアルミナゾルを用い
た。(Example 1) As the ceramic porous body 2, a formed body (diameter 80) made of alumina, silica, and magnesia was used.
mm, volume 50cc, 25cell / inch 2 ) and high frequency absorption layer 3
A high frequency absorber 1 was manufactured using silicon carbide whiskers as the high frequency absorbing material constituting. Further, as the support 5, a woven cloth (80 mm in diameter) in which warp yarns and weft yarns are plain woven at a driving number of 10 (twist yarns) / inch 2 and a carrier layer 6 is formed by twisting 1000 continuous fibers of 15 μm in diameter of silica continuous fibers as the support 5. A catalyst 4 was prepared using alumina as the ceramic fine particles and platinum as the catalyst 7 for decomposing harmful substances. Note that alumina sol was used as the inorganic binder.
【００２７】上記高周波吸収体１と、触媒体４を５枚重
ねて高周波発熱体９を構成し、図３に示す排気ガス浄化
装置（高周波消費電力１．５kw）の加熱室１１に高周波
吸収体１が排気ガスの前流側となるように収納し、排気
ガス量約３００l／min、排気ガス温度３００〜３５０℃
となるようにエンジン（排気量２０００cc）を運転し、
炭化水素分析計による炭化水素の浄化性能を評価したと
ころ、高周波給電３０秒後で約７０％の浄化率が得られ
た。A high-frequency heating element 9 is formed by stacking five high-frequency absorbers 1 and five catalytic members 4 and is provided in a heating chamber 11 of an exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 1 is located on the upstream side of the exhaust gas, the exhaust gas amount is about 300 l / min, and the exhaust gas temperature is 300 to 350 ° C.
Drive the engine (displacement 2000cc) so that
When the performance of purifying hydrocarbons by a hydrocarbon analyzer was evaluated, a purification rate of about 70% was obtained after 30 seconds of high-frequency power supply.
【００２８】また、触媒７として白金の代わりにロジウ
ム、パラジウムの貴金属および銅、マンガン、鉄、コバ
ルトの金属酸化物を用いたところ、高周波給電３０秒後
で４５〜７０％の浄化率が得られた。When noble metals of rhodium and palladium and metal oxides of copper, manganese, iron and cobalt were used instead of platinum as the catalyst 7, a purification rate of 45 to 70% was obtained after 30 seconds of high frequency power supply. Was.
【００２９】（実施例２）セラミック多孔体２としてア
ルミナ、ジルコニアからなる成形体（直径８０mm、容積
５０cc、２５cell/inch2）と、高周波吸収層３を構成す
る高周波吸収材料として酸化亜鉛ウィスカーを用い、高
周波吸収体１を作製した。また支持体５として直径１２
μmのアルミナの連続繊維を８００本集束した撚糸を縦
糸、横糸ともに１０本（撚糸）/inch2の打ち込み数で平
織された織布（直径８０mm）と、担体層６を構成するセ
ラミック微粒子としてジルコニアと、有害物質を分解す
る触媒７として白金を用い、触媒体４を作製した。な
お、無機質バインダとしてアルミナゾルを用いた。(Example 2) A molded body (diameter: 80 mm, volume: 50 cc, 25 cells / inch 2 ) made of alumina and zirconia was used as the porous ceramic body 2, and zinc oxide whisker was used as a high frequency absorption material constituting the high frequency absorption layer 3. The high frequency absorber 1 was produced. The support 5 has a diameter of 12
A woven fabric (diameter: 80 mm) woven with 800 (μm) continuous fibers of alumina continuous fibers woven with 10 (twisted) / inch 2 yarns for both warp and weft yarns, and zirconia as ceramic fine particles constituting the carrier layer 6 And platinum as a catalyst 7 for decomposing harmful substances to prepare a catalyst body 4. Note that alumina sol was used as the inorganic binder.
【００３０】上記高周波吸収体１と、触媒体４を５枚重
ねて高周波発熱体９を構成し、図３に示す排気ガス浄化
装置（高周波消費電力１．５kw）の加熱室１１に高周波
吸収体１が排気ガスの前流側となるように収納し、排気
ガス量約３００l／min、排気ガス温度３００〜３５０℃
となるようにエンジン（排気量２０００cc）を運転し、
炭化水素分析計による炭化水素の浄化性能を評価したと
ころ、高周波給電３０秒後で約６５％の浄化率が得られ
た。A high-frequency heating element 9 is formed by stacking five high-frequency absorbers 1 and five catalytic members 4, and is provided in a heating chamber 11 of an exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 1 is located on the upstream side of the exhaust gas, the exhaust gas amount is about 300 l / min, and the exhaust gas temperature is 300 to 350 ° C.
Drive the engine (displacement 2000cc) so that
When the purification performance of hydrocarbons by a hydrocarbon analyzer was evaluated, a purification rate of about 65% was obtained 30 seconds after the high-frequency power supply.
【００３１】また、前記高周波吸収層３を構成する高周
波吸収材料として酸化亜鉛ウィスカーの代わりに銅、マ
ンガン、コバルト、チタン、スズ、鉄の各酸化物、それ
らの混合物、それらの金属を１種以上含む複合酸化物、
チタン−ケイ素−炭素−酸素の化合物を用いたところ、
高周波給電３０秒後で４５〜６５％の浄化率が得られ
た。As the high-frequency absorbing material constituting the high-frequency absorbing layer 3, oxides of copper, manganese, cobalt, titanium, tin and iron, mixtures thereof, and one or more of these metals are used instead of zinc oxide whiskers. Including complex oxides,
When using a compound of titanium-silicon-carbon-oxygen,
A purification rate of 45 to 65% was obtained 30 seconds after the high-frequency power supply.
【００３２】また、前記担体層６を構成するセラミック
微粒子としてジルコニアの代わりにシリカ、セりアを用
いたところ、高周波給電３０秒後で約６０％の浄化率が
得られた。In addition, when silica and soil were used instead of zirconia as ceramic fine particles constituting the carrier layer 6, a purification rate of about 60% was obtained after 30 seconds of high frequency power supply.
【００３３】なお実施例１、２において高周波エネルギ
を給電しない場合、３０秒後の浄化率は約５％であっ
た。When no high-frequency energy was supplied in Examples 1 and 2, the purification rate after 30 seconds was about 5%.
【００３４】以上のように、本発明の触媒機能を有する
高周波発熱体９（高周波吸収体１と触媒体４）を排気ガ
ス浄化装置に適用し、高周波を給電することにより優れ
た浄化性能を得ることができる。この理由は以下のよう
に考察できる。高周波吸収体１の骨格となるセラミック
支持体を多孔体で構成することで従来のコーディエライ
ト担体からなる触媒体に比べて重量を軽くすることがで
き、高周波吸収体１の熱容量を小さくすることができ
る。その結果、高周波エネルギによる急速加熱が可能と
なり、短時間で高温に加熱することができる。さらに、
高周波吸収体１に隣接して配置している触媒体４はその
骨格がセラミック繊維からなる支持体５で構成されてい
るので触媒体４においても従来の触媒体よりも軽量化さ
れ、熱容量を小さくすることできる。したがって触媒体
４は高周波吸収体１で発生した熱を受けることにより短
時間に触媒として機能する温度に上昇し、触媒機能を発
揮することができる。As described above, the high-frequency heating element 9 having the catalytic function of the present invention (the high-frequency absorber 1 and the catalyst 4) is applied to an exhaust gas purifying apparatus, and an excellent purifying performance is obtained by supplying a high frequency. be able to. The reason can be considered as follows. By making the ceramic support, which is the skeleton of the high frequency absorber 1, a porous body, the weight can be reduced as compared with a conventional catalyst body made of a cordierite carrier, and the heat capacity of the high frequency absorber 1 can be reduced. Can be. As a result, rapid heating by high-frequency energy becomes possible, and heating to a high temperature can be performed in a short time. further,
Since the catalyst body 4 arranged adjacent to the high-frequency absorber 1 is composed of the support 5 whose skeleton is made of ceramic fiber, the weight of the catalyst body 4 is smaller than that of the conventional catalyst body, and the heat capacity is smaller. You can do it. Therefore, the catalyst 4 receives the heat generated by the high-frequency absorber 1 and rises to a temperature at which it functions as a catalyst in a short time, and can exhibit the catalytic function.
【００３５】実施例１、２では触媒体４を５枚積層して
用いたが、この積層の枚数は限定されるものでなく、高
周波発熱体として要求される圧力損失特性、熱容量、触
媒性能によって最適な状態に適宜設計されるものであ
る。In the first and second embodiments, five catalysts 4 were used in a stacked manner. However, the number of stacked catalysts is not limited, and the number of catalysts 4 depends on the pressure loss characteristics, heat capacity, and catalyst performance required of the high-frequency heating element. It is appropriately designed in an optimum state.
【００３６】また実施例では触媒体４における排気ガス
の通路は織布の縦糸と横糸で構成される格子を利用して
いるが、この構成に限定されるものではなく、織布をス
パイラル状に巻き、織布と織布の隙間で排気ガスの通路
を構成してもよい。Further, in the embodiment, the passage of the exhaust gas in the catalyst body 4 uses a lattice constituted by warp and weft of woven fabric. However, the present invention is not limited to this structure. The passage of the exhaust gas may be constituted by the gap between the winding and the woven fabric.
【００３７】なお、上記実施例では高周波吸収体１と触
媒体４を同じ加熱室１１内に配置しているが、この構成
に限定されるものではなく、触媒体４は高周波遮蔽手段
１６の後方に配置してもよい。Although the high-frequency absorber 1 and the catalyst 4 are arranged in the same heating chamber 11 in the above embodiment, the present invention is not limited to this configuration. May be arranged.
【００３８】図４は本発明の他の実施例である触媒機能
を有する高周波発熱体を構成する高周波吸収体の一部断
面図である。高周波吸収体１７は高周波エネルギを吸収
し発熱する機能を有するセラミック多孔体で構成され、
図１で説明したセラミック多孔体２と同様な構造を有す
るものである。すなわち、ポリウレタンなどの有機質の
多孔体（例えばポリウレタンフォーム）を基材としこれ
に高周波エネルギを吸収し発熱するセラミック材料をコ
ーティングし焼成して得られる均一な連続気孔を有する
三次元網状の骨格構造体が適用される。FIG. 4 is a partial sectional view of a high frequency absorber constituting a high frequency heating element having a catalytic function according to another embodiment of the present invention. The high-frequency absorber 17 is made of a porous ceramic body having a function of absorbing high-frequency energy and generating heat.
It has a structure similar to that of the porous ceramic body 2 described in FIG. That is, a three-dimensional net-like skeletal structure having uniform continuous pores obtained by coating an organic porous material (eg, polyurethane foam) such as polyurethane as a base material with a ceramic material that absorbs high-frequency energy and generates heat and firing. Is applied.
【００３９】前述の高周波吸収体１と異なる点はセラミ
ック多孔体自身が高周波を吸収し発熱するので高周波吸
収層３を必要としないことである。The difference from the above-described high frequency absorber 1 is that the high frequency absorbing layer 3 is not required since the ceramic porous body itself absorbs high frequency and generates heat.
【００４０】なお、高周波吸収体１７は前述の高周波吸
収体１と同様に触媒体４との組み合わせで用いられる。
また高周波吸収体１７を構成する材料は前述の高周波吸
収層３と同じものが適用される。The high frequency absorber 17 is used in combination with the catalyst 4 as in the case of the high frequency absorber 1 described above.
The same material as that of the high-frequency absorption layer 3 described above is applied to the high-frequency absorber 17.
【００４１】（実施例３）高周波エネルギ吸収し発熱す
るセラミック多孔体として炭化ケイ素からなる成形体
（直径８０mm、容積５０cc、２５cell/inch2）を作製
し、高周波吸収体１７とした。また支持体５として直径
１２μmのアルミナの連続繊維を８００本集束した撚糸
を縦糸、横糸ともに１０本（撚糸）/inch2の打ち込み数
で平織された織布（直径８０mm）と、担体層６を構成す
るセラミック微粒子としてジルコニアと、有害物質を分
解する触媒７として白金を用い、触媒体４を作製した。
なお、無機質バインダとしてアルミナゾルを用いた。(Example 3) A molded body (diameter: 80 mm, volume: 50 cc, 25 cells / inch 2 ) made of silicon carbide was produced as a ceramic porous body that absorbs high-frequency energy and generates heat. Further, a woven cloth (80 mm in diameter) in which a warp yarn and a weft yarn are plain woven at a driving number of 10 (twist yarns) / inch 2 and a carrier layer 6 as a support 5 is a twisted yarn obtained by bundling 800 continuous fibers of alumina having a diameter of 12 μm into both a warp and a weft. A catalyst 4 was prepared using zirconia as the ceramic fine particles and platinum as the catalyst 7 for decomposing harmful substances.
Note that alumina sol was used as the inorganic binder.
【００４２】上記高周波吸収体１７と、触媒体４を５枚
重ねて高周波発熱体９を構成し、図３に示す排気ガス浄
化装置（高周波消費電力１．５kw）の加熱室１１に高周
波吸収体１７が排気ガスの前流側となるように収納し、
排気ガス量約３００l／min、排気ガス温度３００〜３５
０℃となるようにエンジン（排気量２０００cc）を運転
し、炭化水素分析計による炭化水素の浄化性能を評価し
たところ、高周波給電３０秒後で約７０％の浄化率が得
られた。A high-frequency heating element 9 is formed by stacking five high-frequency absorbers 17 and five catalytic members 4, and is provided in a heating chamber 11 of an exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 17 is located on the upstream side of the exhaust gas,
Exhaust gas amount about 300 l / min, exhaust gas temperature 300-35
When the engine (displacement: 2000 cc) was operated at 0 ° C. and the purification performance of hydrocarbons by a hydrocarbon analyzer was evaluated, a purification rate of about 70% was obtained after 30 seconds of high-frequency power supply.
【００４３】上述のように、高周波吸収体１７として高
周波エネルギを吸収し発熱するセラミック多孔体を用い
ても優れた浄化性能を得ることができる。これは実施例
１、２と同様に高周波吸収体として高周波エネルギを吸
収し発熱するセラミック多孔体を用いることにより熱容
量を小さくすることができるので急速加熱が可能となる
とともにその熱を触媒体４へ効率よく伝達でき、触媒と
して機能する温度により速く昇温させることができるた
めである。As described above, even if a ceramic porous body that absorbs high-frequency energy and generates heat is used as the high-frequency absorber 17, excellent purification performance can be obtained. Since the heat capacity can be reduced by using a ceramic porous body that absorbs high-frequency energy and generates heat as the high-frequency absorber as in the first and second embodiments, rapid heating becomes possible and the heat is transferred to the catalyst 4. This is because the heat can be transmitted efficiently and the temperature can be raised more quickly to the temperature that functions as a catalyst.
【００４４】また高周波吸収体１７は高周波吸収層３を
形成する必要がないので、高周波吸収体１よりもさらに
軽量化することができる可能性を有し、さらなる上記浄
化性能の向上が期待できる。Since the high frequency absorber 17 does not need to form the high frequency absorber 3, there is a possibility that the high frequency absorber 1 can be lighter than the high frequency absorber 1, and further improvement in the purification performance can be expected.
【００４５】従来の排気ガス浄化触媒体は排気ガス中に
長時間曝されると燃料などの含まれるイオウ分の付着に
より触媒が劣化するが、本発明の高周波発熱体９は触媒
体４が高周波吸収体１、１７の排気ガスの流れに対し後
流側に配置されるので排気ガス中に含まれるイオウなど
の付着が抑制され、被毒による触媒の劣化を防止するこ
とができる。When the conventional exhaust gas purifying catalyst is exposed to exhaust gas for a long period of time, the catalyst deteriorates due to the adhesion of sulfur contained in the fuel and the like. Since the absorbers 1 and 17 are arranged downstream of the flow of the exhaust gas, the adhesion of sulfur and the like contained in the exhaust gas can be suppressed, and the catalyst can be prevented from being deteriorated due to poisoning.
【００４６】なお、本発明の触媒機能を有する高周波発
熱体９はオーブン電子レンジなどの調理器から排出され
る油煙、臭気の分解手段としても利用できる。The high-frequency heating element 9 having a catalytic function of the present invention can also be used as a means for decomposing oily smoke and odor discharged from a cooker such as an oven microwave oven.
【００４７】[0047]
【発明の効果】以上説明したように本発明の触媒機能を
有する高周波発熱体によれば、以下の効果が得られる。As described above, according to the high-frequency heating element having a catalytic function of the present invention, the following effects can be obtained.
【００４８】（１）高周波吸収体が軽量であるセラミッ
ク多孔体で構成されるので、従来のコーディエライト担
体からなる触媒体に比べて熱容量を小さくすることがで
きる。したがって、高周波吸収体を短時間で高温に昇温
させることができ、高周波吸収体に隣接して配置してい
る触媒体に高温の熱を伝達することができる。(1) Since the high frequency absorber is made of a lightweight ceramic porous body, the heat capacity can be reduced as compared with a conventional catalyst body made of a cordierite carrier. Therefore, the high-frequency absorber can be heated to a high temperature in a short time, and high-temperature heat can be transmitted to the catalyst disposed adjacent to the high-frequency absorber.
【００４９】（２）触媒体の骨格が軽量であるセラミッ
ク繊維から構成されるので、従来の触媒体に比べて熱容
量を小さくすることができる。したがって、触媒体を高
周波吸収体からの熱を受けて短時間で触媒として機能す
る温度に昇温させることができ、優れた排気ガスの浄化
性能を得ることができる。(2) Since the skeleton of the catalyst body is made of lightweight ceramic fibers, the heat capacity can be reduced as compared with the conventional catalyst body. Therefore, the catalyst can be heated to a temperature that functions as a catalyst in a short time by receiving heat from the high-frequency absorber, and excellent exhaust gas purification performance can be obtained.
【００５０】（３）触媒体は高周波吸収体の排気ガスの
流れに対し後流側に配置されるので、排気ガス中に含ま
れるイオウなどの付着が抑制され、被毒による触媒の劣
化を防止することができるので触媒寿命を向上させるこ
とができる。(3) Since the catalyst is disposed downstream of the flow of the exhaust gas from the high frequency absorber, adhesion of sulfur and the like contained in the exhaust gas is suppressed, and deterioration of the catalyst due to poisoning is prevented. Therefore, the catalyst life can be improved.
【００５１】（４）本発明の触媒機能を有する高周波発
熱体は触媒として機能する温度に極めて短時間で昇温で
きるので、エンジンの排気ガスの熱による触媒加熱を必
要とせず、エンジンから離れた位置に配設することでき
る。したがって自動車が高速走行時などのようにエンジ
ン直下で排気ガス温度が高い状況でも高温環境が避けら
れるので高周波吸収体、触媒体の劣化が著しく抑制さ
れ、優れた耐久性を実現することができる。(4) Since the high-frequency heating element having a catalytic function of the present invention can be heated to a temperature at which it functions as a catalyst in a very short time, it does not need to heat the catalyst by the heat of the exhaust gas of the engine and is separated from the engine. Position. Therefore, even in a situation where the exhaust gas temperature is high immediately below the engine, such as when the vehicle is running at high speed, a high-temperature environment can be avoided, so that the deterioration of the high-frequency absorber and the catalyst can be significantly suppressed, and excellent durability can be realized.
【図１】本発明の一実施例における高周波発熱体を構成
する高周波吸収体の一部断面図FIG. 1 is a partial cross-sectional view of a high-frequency absorber constituting a high-frequency heating element according to an embodiment of the present invention.
【図２】同高周波発熱体を構成する触媒体を示す図FIG. 2 is a view showing a catalyst body constituting the high-frequency heating element.
【図３】同高周波発熱体を用いた排ガス浄化装置の構成
図FIG. 3 is a configuration diagram of an exhaust gas purifying apparatus using the high-frequency heating element.
【図４】本発明の他の実施例における高周波発熱体を構
成する高周波吸収体の一部断面図FIG. 4 is a partial cross-sectional view of a high-frequency absorber constituting a high-frequency heating element according to another embodiment of the present invention.
１、１７ 高周波吸収体 ２ セラミック多孔体 ３ 高周波吸収層 ４ 触媒体 ５ 支持体 ６ 担体層 ７ 触媒 ８ セラミック繊維 ９ 触媒機能を有する高周波発熱体 DESCRIPTION OF SYMBOLS 1, 17 High frequency absorber 2 Ceramic porous body 3 High frequency absorption layer 4 Catalyst 5 Support 6 Carrier layer 7 Catalyst 8 Ceramic fiber 9 High frequency heating element having a catalytic function
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F01N 3/20 - 3/24 B01D 53/86 B01J 35/02Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) F01N 3/20-3/24 B01D 53/86 B01J 35/02
Claims (9)
し発熱する高周波吸収層を形成してなる高周波吸収体
と、複数のセラミック繊維からなる支持体にセラミック
微粒子からなる担体層を形成するとともに前記担体層に
触媒を担持してなる触媒体とから構成される触媒機能を
有する高周波発熱体。1. A high-frequency absorber having a high-frequency absorbing layer that absorbs high-frequency energy and generates heat in a porous ceramic body, and a carrier layer made of ceramic fine particles formed on a support made of a plurality of ceramic fibers. A high-frequency heating element having a catalytic function, comprising a catalyst body having a catalyst supported on a layer.
ク多孔体からなる高周波吸収体と、複数のセラミック繊
維からなる支持体にセラミック微粒子からなる担体層を
形成するとともに前記担体層に触媒を担持してなる触媒
体とから構成される触媒機能を有する高周波発熱体。2. A high-frequency absorber made of a ceramic porous body that absorbs high-frequency energy and generates heat, and a carrier layer made of ceramic fine particles is formed on a support made of a plurality of ceramic fibers, and a catalyst is carried on the carrier layer. A high-frequency heating element having a catalytic function, comprising:
ミナ、マグネシア、ジルコニアの少なくとも１種である
請求項１または２記載の触媒機能を有する高周波発熱
体。3. The high-frequency heating element having a catalytic function according to claim 1, wherein the main component of the ceramic porous body is at least one of silica, alumina, magnesia, and zirconia.
収層と高周波エネルギを吸収し発熱するセラミック多孔
体は主成分が半導体材料である請求項１または２記載の
触媒機能を有する高周波発熱体。4. The high-frequency heating element having a catalytic function according to claim 1, wherein the high-frequency absorbing layer that absorbs high-frequency energy and generates heat and the porous ceramic body that absorbs and generates high-frequency energy are semiconductor materials.
収層と高周波エネルギを吸収し発熱するセラミック多孔
体は亜鉛、銅、マンガン、コバルト、鉄、チタン、ケイ
素の少なくとも１種を含む酸化物および炭化物である請
求項１または２記載の触媒機能を有する高周波発熱体。5. A high-frequency absorbing layer that absorbs high-frequency energy and generates heat and a porous ceramic body that absorbs high-frequency energy and generates heat include oxides and carbides containing at least one of zinc, copper, manganese, cobalt, iron, titanium, and silicon. The high-frequency heating element having a catalytic function according to claim 1 or 2.
収層と高周波エネルギを吸収し発熱するセラミック多孔
体は主成分が炭化ケイ素である請求項１または２記載の
触媒機能を有する高周波発熱体。6. A high-frequency heating element having a catalytic function according to claim 1, wherein the high-frequency absorbing layer that absorbs high-frequency energy and generates heat and the porous ceramic body that absorbs and generates high-frequency energy are mainly silicon carbide.
成分がシリカ、アルミナの少なくとも１種である請求項
１または２記載の触媒機能を有する高周波発熱体。7. The high-frequency heating element having a catalytic function according to claim 1, wherein the support made of a plurality of ceramic fibers is mainly composed of at least one of silica and alumina.
分がシリカ、アルミナ、ジルコニア、セリアの少なくと
も１種である請求項１または２記載の触媒機能を有する
高周波発熱体。8. A high-frequency heating element having a catalytic function according to claim 1, wherein the main component of the ceramic fine particles constituting the carrier layer is at least one of silica, alumina, zirconia and ceria.
る金属微粒子、銅、マンガン、コバルト、鉄の金属酸化
物の少なくとも１種である請求項１または２記載の触媒
機能を有する高周波発熱体。9. The high-frequency heating element having a catalytic function according to claim 1, wherein the catalyst is at least one of fine metal particles made of platinum, palladium and rhodium, and metal oxides of copper, manganese, cobalt and iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116601A JP2848242B2 (en) | 1994-05-30 | 1994-05-30 | High frequency heating element with catalytic function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116601A JP2848242B2 (en) | 1994-05-30 | 1994-05-30 | High frequency heating element with catalytic function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07324616A JPH07324616A (en) | 1995-12-12 |
| JP2848242B2 true JP2848242B2 (en) | 1999-01-20 |
Family
ID=14691202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6116601A Expired - Fee Related JP2848242B2 (en) | 1994-05-30 | 1994-05-30 | High frequency heating element with catalytic function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2848242B2 (en) |
-
1994
- 1994-05-30 JP JP6116601A patent/JP2848242B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07324616A (en) | 1995-12-12 |
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