JPH06126190A - High-frequency heating element having catalytic function - Google Patents
High-frequency heating element having catalytic functionInfo
- Publication number
- JPH06126190A JPH06126190A JP4281485A JP28148592A JPH06126190A JP H06126190 A JPH06126190 A JP H06126190A JP 4281485 A JP4281485 A JP 4281485A JP 28148592 A JP28148592 A JP 28148592A JP H06126190 A JPH06126190 A JP H06126190A
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- ceramic
- frequency
- frequency heating
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 73
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 121
- 239000003054 catalyst Substances 0.000 claims abstract description 55
- 239000010419 fine particle Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000011358 absorbing material Substances 0.000 claims description 28
- 239000000835 fiber Substances 0.000 claims description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical class [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 6
- 239000010941 cobalt Substances 0.000 claims description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 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 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 229910000510 noble metal Inorganic materials 0.000 claims description 4
- 229910052703 rhodium Inorganic materials 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
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 abstract description 16
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 43
- 238000000746 purification Methods 0.000 description 22
- 239000006096 absorbing agent Substances 0.000 description 19
- 239000000126 substance Substances 0.000 description 13
- 239000011230 binding agent Substances 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction 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
- 230000000694 effects Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 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
- 238000006555 catalytic reaction Methods 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910003445 palladium oxide Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 salt compound Chemical class 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
Abstract
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
て加熱昇温し、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 relates to a high-frequency heating element that heats and heats by using high-frequency energy to decompose harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged from internal combustion engines such as automobiles. It is about.
【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、現在実用
化されている。この後処理方式に用いられる代表的な触
媒体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
三元触媒があり、この三元触媒は主として乗用車に搭載
されている。2. Description of the Related Art Automobiles that use gasoline as a fuel are subject to stricter restrictions on the emission of hydrocarbons, carbon monoxide, and nitrogen oxides contained in exhaust gas. As one of the purification methods for these pollutants, there is a post-treatment method using a catalyst, which is currently in practical use. As a typical catalyst used in this post-treatment system, by controlling the air-fuel ratio to near the stoichiometric air-fuel ratio, the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides are simultaneously performed, and harmless carbon dioxide and steam , There is a three-way catalyst that converts to nitrogen, and this three-way catalyst is mainly installed in passenger cars.
【０００３】図４は乗用車に搭載されている従来の排ガ
ス浄化装置を示す。同図において、１はエンジン、２は
排気マニホールド、３は排気管、４は酸素センサ、５は
三元触媒体、６は触媒を収納する容器、７は排気温度セ
ンサ、８はマフラーであり、従来の排ガス浄化装置は三
元触媒体５と容器６から構成され、三元触媒体５は排気
マニホールド２に接続された排気管３の途中に配置され
ている。三元触媒体５は特公昭５２−３３５８号公報に
開示されているように、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セラミック成型体か
らなる担体に表面積の大きいアルミナなどの微粒子から
なるコーティング層を設け、このコーティング層に白
金、パラジウム、ロジウムなどの貴金属微粒子を担持し
て構成されている。FIG. 4 shows a conventional exhaust gas purifying apparatus mounted on a passenger car. In the figure, 1 is an engine, 2 is an exhaust manifold, 3 is an exhaust pipe, 4 is an oxygen sensor, 5 is a three-way catalyst, 6 is a container for storing a catalyst, 7 is an exhaust temperature sensor, and 8 is a muffler. The conventional exhaust gas purifying apparatus is composed of a three-way catalyst body 5 and a container 6, and the three-way catalyst body 5 is arranged in the middle of the exhaust pipe 3 connected to the exhaust manifold 2. As disclosed in Japanese Examined Patent Publication No. 52-3358, the three-way catalyst body 5 is formed of a fine particle such as alumina having a large surface area on a carrier formed of a cordierite ceramic molded body containing silica, alumina and magnesia as main components. Is provided, and the noble metal fine particles such as platinum, palladium, and rhodium are supported on the coating layer.
【０００４】エンジン１が始動すると燃焼による排気ガ
スは排気マニホールド２を通り排気管３の途中に設けら
れた排気ガス浄化装置に導かれる。この排気ガスは三元
触媒体５のハニカム構造を構成する各々のセルを通過し
て排気管３より大気に排出される。このとき、空燃比は
酸素センサ４により理論空燃比付近に制御され、排気ガ
ス中に含まれる炭化水素、一酸化炭素、窒素酸化物は三
元触媒体５の酸化、還元反応により無害な炭酸ガス、水
蒸気、窒素に変換される。When the engine 1 is started, the exhaust gas produced by combustion passes through the exhaust manifold 2 and is guided to an exhaust gas purifying device provided midway in the exhaust pipe 3. This exhaust gas passes through each cell forming the honeycomb structure of the three-way catalyst body 5 and is exhausted to the atmosphere from the exhaust pipe 3. At this time, the air-fuel ratio is controlled near the stoichiometric air-fuel ratio by the oxygen sensor 4, and hydrocarbons, carbon monoxide, and nitrogen oxides contained in the exhaust gas are harmless carbon dioxide gas due to the oxidation and reduction reactions of the three-way catalyst body 5. , Converted to steam and nitrogen.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の構成において触媒反応を起こさせるためには三元触
媒体５を触媒として機能する温度に昇温させる必要があ
る。この三元触媒体５は排気ガスの熱によって加熱され
るが常温にあるエンジンが始動する場合は触媒として機
能する温度に到達するのに約１分を要し、それまでは有
害な排気ガスが大気に排出されるという課題があった。However, in order to cause a catalytic reaction in the above conventional structure, it is necessary to raise the temperature of the three-way catalyst body 5 to a temperature at which it functions as a catalyst. This three-way catalyst body 5 is heated by the heat of the exhaust gas, but when the engine at room temperature starts, it takes about 1 minute to reach the temperature at which it functions as a catalyst. There was a problem of being released into the atmosphere.
【０００６】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 problems and has a catalytic function for reducing harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged at the time of starting an engine of an automobile or the like by utilizing high frequency heating. The purpose is to provide a high-frequency heating element.
【０００７】[0007]
【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
支持体と、前記セラミック支持体に被覆された高周波エ
ネルギを吸収し発熱する高周波吸収材と、前記セラミッ
ク支持体と前記高周波吸収材で構成される表面に被覆さ
れたセラミック微粒子と、前記セラミック支持体と前記
高周波吸収材と前記セラミック微粒子で構成される表面
に担持された触媒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 of the present invention is a ceramic support and a high-frequency absorbing material that absorbs high-frequency energy and heats the ceramic support. And ceramic fine particles coated on the surface composed of the ceramic support and the high frequency absorbing material, and a catalyst supported on the surface composed of the ceramic support, the high frequency absorbing material and the ceramic fine particles. is doing.
【０００８】また前記セラミック支持体はセラミック粒
子からなる成型体、もしくはセラミック繊維の成型体で
構成している。The ceramic support is a molded body made of ceramic particles or a molded body of ceramic fibers.
【０００９】また前記セラミック支持体表面に被覆され
る前記高周波発熱材は炭化珪素ウィスカーで構成してい
る。The high-frequency heating material coated on the surface of the ceramic support is made of silicon carbide whiskers.
【００１０】[0010]
【作用】上記構成において、本発明の触媒機能を有する
高周波発熱体を収納している加熱室に高周波エネルギが
給電されると、セラミック支持体に被覆された高周波吸
収材が高周波エネルギを吸収し、熱変換によって加熱さ
れる。同時に高周波吸収材とセラミック支持体とセラミ
ック微粒子で構成される表面に担持された触媒が加熱さ
れ、自動車などの排気ガス中に含まれる一酸化炭素や炭
化水素は無害な炭酸ガスと水蒸気に変換される。このと
き、触媒はセラミック微粒子によって得られる大きな比
表面積を有する表面に担持されているので高い触媒活性
が得られる。 セラミック支持体としてセラミック粒子
からなる成型体を用いた高周波発熱体の場合、高周波エ
ネルギは前記セラミック支持体の表面に被覆された高周
波吸収材によって吸収されるので前記高周波発熱体の表
面近傍（セラミック微粒子と触媒を含む）が選択的に加
熱され、短時間で触媒として機能する温度に昇温させる
ことができる。In the above structure, when high-frequency energy is supplied to the heating chamber containing the high-frequency heating element having the catalytic function of the present invention, the high-frequency absorbing material coated on the ceramic support absorbs the high-frequency energy, It is heated by heat conversion. At the same time, the catalyst supported on the surface composed of the high-frequency absorber, the ceramic support and the ceramic particles is heated, and carbon monoxide and hydrocarbons contained in the exhaust gas of automobiles are converted into harmless carbon dioxide and water vapor. It At this time, since the catalyst is supported on the surface having a large specific surface area obtained by the ceramic fine particles, a high catalytic activity can be obtained. In the case of a high-frequency heating element using a molded body made of ceramic particles as a ceramic support, high-frequency energy is absorbed by the high-frequency absorbing material coated on the surface of the ceramic support, and thus the vicinity of the surface of the high-frequency heating element (ceramic fine particles) And a catalyst) are selectively heated, and the temperature can be raised to a temperature at which the catalyst functions in a short time.
【００１１】またセラミック支持体としてセラミック繊
維からなる成型体を用いた高周波発熱体の場合、前記セ
ラミック繊維で構成されるセラミック支持体が多孔質構
造となるので前記高周波発熱体自身の熱容量を小さくす
ることでき、より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る。Further, in the case of a high frequency heating element using a molded body made of ceramic fiber as a ceramic support, since the ceramic support made of the ceramic fiber has a porous structure, the heat capacity of the high frequency heating element itself is reduced. Therefore, the temperature can be raised to a temperature that functions as a catalyst in a shorter time.
【００１２】また、高周波吸収材として適用される炭化
珪素ウィスカーは高周波エネルギの吸収特性、耐熱性、
化学的安定性が高いので、高周波発熱体としての信頼性
に優れ、排気ガス浄化性能を持続させることができる。Further, the silicon carbide whiskers applied as a high-frequency absorber have high-frequency energy absorption characteristics, heat resistance, and
Since it has high chemical stability, it has excellent reliability as a high-frequency heating element and can maintain exhaust gas purification performance.
【００１３】[0013]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１４】図１は本発明の触媒機能を有する高周波発
熱体の外観の一例を示すものであり、高周波発熱体９を
構成するセラミック支持体としてはアルミナ、シリカ、
マグネシアを主成分とするセラミック粒子の押し出し加
工による成型体、もしくはアルミナ、シリカ、ジルコニ
アなどのセラミック繊維からなる多孔質シートのコルゲ
ート加工による成型体が適用される。これらのセラミッ
ク成型体は図１に示すように気体が通過できる複数の気
孔を有するハニカム状構造（ここでいうハニカムはセル
の形状が六角形でなくてもよい）とすることが実用的で
あるが、これに限定されるものではなく、セラミック支
持体に孔開け加工による気孔を設けたものでもよい。こ
れらのセラミック支持体は高周波エネルギを吸収し発熱
する高周波吸収材によって被覆されるとともに、セラミ
ック支持体と前記高周波吸収材とで構成される表面はセ
ラミック微粒子によって被覆され、さらに排気ガス中の
有害物質を低温で分解する触媒が担持される。FIG. 1 shows an example of the appearance of a high-frequency heating element having a catalytic function according to the present invention. As a ceramic support forming the high-frequency heating element 9, alumina, silica,
A molded product obtained by extruding ceramic particles containing magnesia as a main component, or a molded product obtained by corrugating a porous sheet made of ceramic fibers such as alumina, silica, and zirconia is applied. As shown in FIG. 1, it is practical that these ceramic molded bodies have a honeycomb structure having a plurality of pores through which a gas can pass (the honeycomb here does not have to have a hexagonal cell shape). However, the present invention is not limited to this, and the ceramic support may be provided with pores by punching. These ceramic supports are covered with a high-frequency absorbing material that absorbs high-frequency energy and generates heat, and the surface composed of the ceramic support and the high-frequency absorbing material is covered with fine ceramic particles. A catalyst that decomposes at low temperature is supported.
【００１５】図２は本発明の高周波発熱体９の一部断面
図である。同図（ａ）において１０はセラミック支持体
であり、セラミック支持体１０としてセラミック粒子の
押し出し加工で造られる成型体を用いた高周波発熱体９
の断面の一部である。このセラミック支持体１０は高周
波エネルギを吸収し発熱する高周波吸収材１１によって
被覆され、この高周波吸収材１１とセラミック支持体１
０で構成される表面はセラミック微粒子１２によって被
覆され、さらにセラミック支持体１０と高周波吸収材１
１とセラミック微粒子１２で構成される表面には有害物
質を分解する触媒１３が担持されている。なお、セラミ
ック支持体１０と高周波吸収材１１、セラミック微粒子
１２は無機質バインダー（図示せず）によって接着され
ている。FIG. 2 is a partial sectional view of the high frequency heating element 9 of the present invention. In FIG. 1A, reference numeral 10 is a ceramic support, and a high frequency heating element 9 using a molded body formed by extrusion of ceramic particles as the ceramic support 10.
Is a part of the cross section of. The ceramic support 10 is covered with a high-frequency absorber 11 that absorbs high-frequency energy and generates heat, and the high-frequency absorber 11 and the ceramic support 1 are covered.
The surface composed of 0 is covered with ceramic fine particles 12, and further the ceramic support 10 and the high frequency absorber 1
A catalyst 13 for decomposing harmful substances is carried on the surface composed of 1 and ceramic fine particles 12. The ceramic support 10, the high frequency absorbing material 11, and the ceramic fine particles 12 are bonded by an inorganic binder (not shown).
【００１６】一方同図（ｂ）はセラミック支持体１０が
セラミック繊維からなる多孔質シートのコルゲート加工
で造られる成型体を用いた高周波発熱体９の断面の一部
であり、１４はセラミック繊維を示している。このセラ
ミック繊維１４の成型体からなるセラミック支持体１０
は同図（ａ）のセラミック粒子の成型体よりなるセラミ
ック支持体１０よりも多孔質構造とすることができるの
で、高周波吸収材１１はこのセラミック支持体１０の外
表面だけでなく、内部にも存在する。すなわち、セラミ
ック繊維１４の表面が高周波吸収材１１によって被覆さ
れている。そして高周波吸収材１１とセラミック繊維１
４で構成される表面は同図（ａ）で述べたようにセラミ
ック微粒子１２によって被覆され、さらにセラミック支
持体１０と高周波吸収材１１とセラミック微粒子１２で
構成される表面には有害物質を分解する触媒１３が担持
されている。またセラミック支持体１０を構成するセラ
ミック繊維１４と高周波吸収材１１、セラミック微粒子
１２は無機質バインダー（図示せず）によって接着され
ている。On the other hand, FIG. 1B shows a part of a cross section of a high-frequency heating element 9 using a molded body in which a ceramic support 10 is formed by corrugating a porous sheet made of ceramic fibers, and 14 is a ceramic fiber. Shows. Ceramic support 10 made of a molded body of this ceramic fiber 14
Can have a more porous structure than the ceramic support 10 made of a molded body of ceramic particles shown in FIG. 1A, so that the high-frequency absorber 11 can be applied not only to the outer surface of the ceramic support 10 but also to the inside thereof. Exists. That is, the surface of the ceramic fiber 14 is covered with the high frequency absorbing material 11. And the high frequency absorber 11 and the ceramic fiber 1
The surface constituted by 4 is covered with the ceramic fine particles 12 as described in FIG. 1A, and the surface constituted by the ceramic support 10, the high frequency absorbing material 11 and the ceramic fine particles 12 decomposes harmful substances. The catalyst 13 is carried. Further, the ceramic fibers 14 constituting the ceramic support 10, the high frequency absorbing material 11, and the ceramic fine particles 12 are bonded by an inorganic binder (not shown).
【００１７】セラミック支持体１０への高周波吸収材１
１とセラミック微粒子１２の被覆、及び触媒１３の担持
は次のようにして行われる。先ず、高周波吸収材１１に
無機質バインダーと溶媒（通常は水）を加え、スラリー
を作製し、このスラリーにセラミック支持体１０を浸漬
し、高周波吸収材１１を付着させた後、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１１の付着量、接着力を保持できるバインダー量、
浸漬処理の際の作業などによって適宜設定される。次
に、セラミック微粒子１２と無機質バインダーと溶媒
（通常は水）で調整されたスラリーに前記高周波吸収材
１１を被覆したセラミック支持体１０を浸漬し、セラミ
ック微粒子１２を付着させた後、乾燥（もしくは焼成）
する。このセラミック微粒子１２を含むスラリーの組成
も上述の高周波吸収材１１を含むスラリーと同様に適宜
設定される。次に、金属からなる触媒１３もしくは触媒
１３を含む金属塩化合物を溶解させた（または分散させ
た）溶媒中に高周波吸収材１１、セラミック微粒子１２
を被覆したセラミック支持体１０を浸漬し、触媒１３を
担持した後、乾燥（もしくは焼成）する。なお、触媒１
３はあらかじめセラミック微粒子１２を含むスラリーに
所定量加えておき、前述の触媒担持工程を省いてもよ
い。また、担持前の触媒が金属酸化物である場合は無機
質バインダーと溶媒からなるスラリーを作製し、これに
高周波吸収材１１、セラミック微粒子１２を被覆したセ
ラミック支持体１０を浸漬し、触媒１３を担持してもよ
い。High frequency absorber 1 for ceramic support 10
The coating of 1 and the ceramic fine particles 12 and the loading of the catalyst 13 are performed as follows. First, an inorganic binder and a solvent (usually water) are added to the high frequency absorbing material 11 to prepare a slurry, the ceramic support 10 is dipped in the slurry, and the high frequency absorbing material 11 is adhered thereto, and then dried (or fired). To do. The composition of the slurry is the required amount of the high-frequency absorber 11 attached, the amount of binder that can maintain the adhesive force,
It is appropriately set depending on the work at the time of immersion treatment. Next, the ceramic support 10 coated with the high-frequency absorbing material 11 is dipped in a slurry prepared by the ceramic fine particles 12, an inorganic binder and a solvent (usually water), and the ceramic fine particles 12 are adhered and then dried (or Firing)
To do. The composition of the slurry containing the ceramic fine particles 12 is appropriately set similarly to the slurry containing the high frequency absorbing material 11 described above. Next, the high frequency absorbing material 11 and the ceramic fine particles 12 are dissolved in a solvent in which the catalyst 13 made of metal or the metal salt compound containing the catalyst 13 is dissolved (or dispersed).
The ceramic support 10 coated with is soaked, and the catalyst 13 is carried, and then dried (or fired). The catalyst 1
3 may be added in advance to the slurry containing the ceramic fine particles 12 in a predetermined amount, and the catalyst supporting step described above may be omitted. When the catalyst before loading is a metal oxide, a slurry containing an inorganic binder and a solvent is prepared, and the high frequency absorbing material 11 and the ceramic support 10 coated with the ceramic fine particles 12 are immersed in the slurry to carry the catalyst 13. You may.
【００１８】次に本発明の高周波発熱体９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 operation and effect of the high-frequency heating element 9 of the present invention will be described by taking an exhaust gas purifying apparatus as an example.
【００１９】図３は本発明の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
する装置の一例である。同図において、１５は内燃機関
の排気ガスを排出する排気管、１６は排気管の途中に設
けられた加熱室、１７は加熱室１６内に収納される高周
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１７は高周波発熱体９の外周と加熱室１６の内壁と
の間の断熱機能も兼ねている。１８は加熱室１６に給電
する高周波エネルギを発生させる高周波発振器、１９は
高周波発振器１８から発生した高周波エネルギを加熱室
１６に伝送する導波管である。２０、２１は加熱室１６
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 an example of an apparatus for purifying exhaust gas discharged from an automobile, in which the high frequency heating element 9 having the catalytic function of the present invention is arranged. In the figure, 15 is an exhaust pipe for discharging the exhaust gas of the internal combustion engine, 16 is a heating chamber provided in the middle of the exhaust pipe, and 17 is a support for supporting the high-frequency heating element 9 housed in the heating chamber 16. This support member 17 also serves as a heat insulating function between the outer periphery of the high-frequency heating element 9 and the inner wall of the heating chamber 16. Reference numeral 18 is a high-frequency oscillator that generates high-frequency energy to be supplied to the heating chamber 16, and 19 is a waveguide that transmits the high-frequency energy generated from the high-frequency oscillator 18 to the heating chamber 16. 20 and 21 are heating chambers 16
Is a high-frequency shielding means that limits the number of holes, and is composed of a metal plate having many punching holes or a metal honeycomb structure having many through holes.
【００２０】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１５を通り、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１８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１９を伝送して高周波発熱体
９を収納している加熱室１６に給電される。高周波発熱
体９は給電された高周波エネルギの熱変換と排気ガスの
もつ熱エネルギによって加熱される。高周波発熱体９に
存在する触媒１３が触媒として機能する温度に達する
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反応し、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
はマフラを通過して排気管１５より大気に排出される。When the engine of a gasoline vehicle is started, the exhaust gas containing harmful substances such as carbon monoxide and hydrocarbons discharged from the engine passes through the exhaust pipe 15 and passes through the high frequency heating element 9.
Flow into. On the other hand, at the same time as the engine is started or immediately before the engine is started, the high frequency oscillator 18 generates high frequency energy according to a command from a control unit (not shown). This high-frequency energy is transmitted through the waveguide 19 and supplied to the heating chamber 16 that houses the high-frequency heating element 9. The high-frequency heating element 9 is heated by the heat conversion of the supplied high-frequency energy and the heat energy of the exhaust gas. When the temperature of the catalyst 13 existing in the high-frequency heating element 9 reaches a temperature at which the catalyst functions as a catalyst, carbon monoxide and hydrocarbons, which are harmful substances in the exhaust gas, react with oxygen contained in the exhaust gas and form harmless water vapor. Decomposed into carbon dioxide. The harmless exhaust gas passes through the muffler and is exhausted to the atmosphere through the exhaust pipe 15.
【００２１】（実施例１）図２（ａ）に示すセラミック
粒子からなるセラミック支持体１０としてコーディエラ
イトのハニカム状（セルは四角形）成型体（容積１００
ｃｃ、２００ｃｅｌｌ／ｉｎｃｈ2 ）、高周波吸収材１
１として酸化亜鉛ウィスカー、比表面積を大きくするた
めのセラミック微粒子１２としてアルミナ、有害物質を
分解する触媒１３として白金を用い、高周波発熱体９を
構成した。なお、無機質バインダーとしてアルミナゾル
を用いた。この高周波発熱体９を図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１６に収
納し、排気ガス量約３００／ｍｉｎ、排気ガス温度３０
０〜３５０℃となるようにエンジン（排気量２０００ｃ
ｃ）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５０％の
浄化率が得られた。(Embodiment 1) As a ceramic support 10 made of ceramic particles shown in FIG. 2A, a cordierite honeycomb (cell is quadrangular) shaped body (volume 100) is used.
cc, 200 cells / inch2), high frequency absorber 1
A high-frequency heating element 9 was constructed by using zinc oxide whiskers as 1, alumina as ceramic fine particles 12 for increasing the specific surface area, and platinum as a catalyst 13 for decomposing harmful substances. Alumina sol was used as the inorganic binder. This high-frequency heating element 9 is housed in the heating chamber 16 of the exhaust gas purification device (high-frequency power consumption 1.5 kW) shown in FIG. 3, and the exhaust gas amount is about 300 / min and the exhaust gas temperature 30.
Engine (displacement 2000c
When c) was operated and the hydrocarbon purification performance was evaluated by a hydrocarbon analyzer, a purification rate of about 50% was obtained after 30 seconds of high frequency power feeding.
【００２２】また、高周波吸収材１１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−珪素−炭素−酸素の
化合物を用いたところ、高周波給電３０秒後で４０〜５
０％の浄化性能が得られた。As the high frequency absorbing material 11, instead of zinc oxide whiskers, copper, manganese, cobalt, titanium,
When each oxide of tin and iron, a mixture thereof, a composite oxide containing one or more of those metals, and a compound of titanium-silicon-carbon-oxygen was used, 40 to 5 after 30 seconds of high frequency power feeding.
A purification performance of 0% was obtained.
【００２３】また、触媒１３として白金の代わりにロジ
ウム、パラジウムの貴金属及び銅、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３５〜５０％の浄化率が得られた。When a noble metal such as rhodium and palladium and metal oxides of copper, manganese, iron and cobalt were used as the catalyst 13 instead of platinum, a purification rate of 35 to 50% was obtained after 30 seconds of high frequency power feeding. It was
【００２４】上述のように、本発明の高周波発熱体９の
セラミック支持体１０としてセラミック粒子からなる成
型体を用いた場合、それ自身が緻密であるので高周波吸
収材１１はセラミック支持体１０の外表面に被覆された
状態にある。したがって、高周波発熱体９での高周波エ
ネルギによる発熱は主として高周波吸収材１１の存在す
る表面近傍で起こる。同時に高周波吸収材１１とセラミ
ック支持体１０で構成される表面に被覆されたセラミッ
ク粒子１２と触媒１３も加熱されるので極めて短時間で
触媒として機能する温度に昇温する。さらに触媒１３は
比表面積の大きいセラミック微粒子に担持されているの
で触媒としての活性が高く、排気ガス中に含まれる一酸
化炭素、炭化水素は直ちに浄化される。この排気ガスの
浄化は自動車エンジンが始動してから十秒前後から開始
するので従来の触媒装置に比べ、排気ガスの浄化性能が
向上する。As described above, when a molded body made of ceramic particles is used as the ceramic support 10 of the high frequency heating element 9 of the present invention, the high frequency absorbing material 11 is outside the ceramic support 10 because it is dense in itself. It is in a state of being coated on the surface. Therefore, heat generation by the high-frequency energy in the high-frequency heating element 9 mainly occurs near the surface where the high-frequency absorber 11 is present. At the same time, the ceramic particles 12 and the catalyst 13 coated on the surface composed of the high-frequency absorber 11 and the ceramic support 10 are also heated, so that the temperature rises to a temperature that functions as a catalyst in an extremely short time. Further, since the catalyst 13 is supported on the ceramic fine particles having a large specific surface area, it has a high activity as a catalyst, and carbon monoxide and hydrocarbons contained in the exhaust gas are immediately purified. Since the purification of the exhaust gas is started about 10 seconds after the automobile engine is started, the purification performance of the exhaust gas is improved as compared with the conventional catalyst device.
【００２５】上述のセラミック支持体１０は耐熱性、機
械的強度に優れたセラミック材料が望ましく、特にセラ
ミック粒子の押し出し加工で造られる成型体としてはコ
ーディエライト、アルミナなどの材質が適用される。The above-mentioned ceramic support 10 is preferably made of a ceramic material having excellent heat resistance and mechanical strength, and in particular, a molded body formed by extrusion of ceramic particles is made of a material such as cordierite or alumina.
【００２６】またセラミック微粒子１２は比表面積を大
きくすることにより、担持される触媒１３の分散性を向
上させ触媒活性を高くすることが目的で用いられるもの
でありあり、耐熱性の優れたアルミナ、セリアで代表さ
れる金属酸化物などのセラミック微粒子がよい。The ceramic fine particles 12 are used for the purpose of improving the dispersibility of the supported catalyst 13 and enhancing the catalytic activity by increasing the specific surface area, and alumina and ceria having excellent heat resistance are used. Ceramic fine particles such as metal oxides represented by are preferable.
【００２７】また有害物質を低温で分解する触媒１３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。Examples of the catalyst 13 for decomposing harmful substances at low temperature include noble metals such as platinum, palladium and rhodium, oxides of copper, manganese and cobalt, and perovskite type complex oxides, and at least one of them is applied. .
【００２８】また無機質バインダー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 inorganic binder is not particularly limited, but colloidal particles of alumina, silica, zirconia or the like having excellent heat resistance and adhesiveness are preferable.
【００２９】（実施例２）図２（ｂ）に示すセラミック
繊維からなるセラミック支持体１０としてアルミナ・シ
リカ繊維のハニカム状（セルは三角形）成型体（容積１
００ｃｃ、２００ｃｅｌｌ／ｉｎｃｈ2 ）、高周波吸収
材１１として酸化亜鉛ウィスカー、比表面積を大きくす
るための微粒子１２としてアルミナ、有害物質を分解す
る触媒１３として白金を用い、高周波発熱体９を構成し
た。なお、無機質バインダーとしてアルミナゾルを用い
た。この高周波発熱体９を図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１６に収納し、
排気ガス量約３００ ／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５５％の浄化
率が得られた。(Embodiment 2) As a ceramic support 10 made of ceramic fibers shown in FIG. 2B, a honeycomb-shaped (cell is triangular) shaped body (volume 1) of alumina / silica fibers is formed.
A high frequency heating element 9 was constructed by using 00 cc, 200 cells / inch <2>, zinc oxide whiskers as the high frequency absorbing material 11, alumina as the fine particles 12 for increasing the specific surface area, and platinum as the catalyst 13 for decomposing harmful substances. Alumina sol was used as the inorganic binder. The high-frequency heating element 9 is housed in the heating chamber 16 of the exhaust gas purification device (high-frequency power consumption 1.5 kW) shown in FIG.
Exhaust gas amount about 300 / min, exhaust gas temperature 300 ~
Engine (displacement 2000cc) so that it becomes 350 ° C
Was operated and the hydrocarbon purification performance was evaluated by a hydrocarbon analyzer, and a purification rate of about 55% was obtained after 30 seconds of high-frequency power feeding.
【００３０】また、セラミック繊維１４としてアルミナ
・シリカ繊維の代わりにジルコニア繊維を用いたとこ
ろ、上記と同等の性能が得られた。When zirconia fibers were used as the ceramic fibers 14 instead of the alumina / silica fibers, the same performance as above was obtained.
【００３１】上述のように、本発明の高周波発熱体９の
セラミック支持体１０としてセラミック繊維１４からな
る成型体を用いた場合、それ自身が多孔質構造となるの
で高周波吸収材１１はセラミック支持体１０の外表面だ
けでなく、内部にも存在する。すなわち、セラミック繊
維１４の表面が高周波吸収材１１によって被覆された状
態にあるので、高周波発熱体９はほぼ全体が高周波エネ
ルギによって加熱されることになる。しかしながら、セ
ラミック繊維１４からなる支持体１０は上述の通り、多
孔質構造であるのでその熱容量をセラミック粒子からな
る支持体１０（図２（ａ））に比べ、１／２以下にする
ことができる。したがって高周波エネルギによる加熱が
高周波発熱体９の全体であっても、極めて短時間で触媒
として機能する温度に加熱することができ、優れた排気
ガスの浄化性能を得ることができる。 上述のセラミッ
ク繊維１４は耐熱性に優れたセラミック材料が望まし
く、特にセラミック繊維シートのコルゲート加工で造ら
れる成型体としてはアルミナ、シリカ、ジルコニアなど
の材質が適用される。As described above, when a molded body made of ceramic fibers 14 is used as the ceramic support 10 of the high-frequency heating element 9 of the present invention, the high-frequency absorber 11 itself has a porous structure and therefore the high-frequency absorber 11 is a ceramic support. It exists not only on the outer surface of 10, but also on the inside. That is, since the surface of the ceramic fiber 14 is covered with the high frequency absorbing material 11, the high frequency heating element 9 is heated almost entirely by the high frequency energy. However, since the support 10 made of the ceramic fibers 14 has a porous structure as described above, its heat capacity can be reduced to 1/2 or less as compared with the support 10 made of ceramic particles (FIG. 2A). . Therefore, even if the whole of the high-frequency heating element 9 is heated by the high-frequency energy, it can be heated to a temperature that functions as a catalyst in an extremely short time, and an excellent exhaust gas purification performance can be obtained. A ceramic material having excellent heat resistance is desirable for the above-mentioned ceramic fiber 14, and in particular, a material such as alumina, silica, or zirconia is applied as a molded body formed by corrugating a ceramic fiber sheet.
【００３２】（実施例３）図２（ａ）に示すセラミック
粒子からなるセラミック支持体１０としてコーディエラ
イトのハニカム状（セルは四角形）成型体（容積１００
ｃｃ、２００ｃｅｌｌ／ｉｎｃｈ2 ）、高周波吸収材１
１として炭化珪素ウィスカー、比表面積を大きくするた
めの微粒子１２としてアルミナ、有害物質を分解する触
媒１３として白金を適用し、高周波発熱体９を構成し
た。なお、無機質バインダとしてアルミナゾルを用い
た。この高周波発熱体９を図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１６に収納し、
排気ガス量約３００ ／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６０％の浄化
率が得られた。(Embodiment 3) As a ceramic support 10 made of the ceramic particles shown in FIG.
cc, 200 cells / inch2), high frequency absorber 1
The high frequency heating element 9 was constituted by applying silicon carbide whiskers as 1, the alumina as the fine particles 12 for increasing the specific surface area, and platinum as the catalyst 13 for decomposing harmful substances. Alumina sol was used as the inorganic binder. The high-frequency heating element 9 is housed in the heating chamber 16 of the exhaust gas purification device (high-frequency power consumption 1.5 kW) shown in FIG.
Exhaust gas amount about 300 / min, exhaust gas temperature 300 ~
Engine (displacement 2000cc) so that it becomes 350 ° C
Was operated and the hydrocarbon purification performance was evaluated by a hydrocarbon analyzer. A purification rate of about 60% was obtained after 30 seconds of high-frequency power feeding.
【００３３】高周波吸収特性の高い高周波吸収材１１と
しては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、珪素を主成分とする
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明確ではないが、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。Examples of the high frequency absorbing material 11 having high high frequency absorption characteristics include semiconductor materials, and particularly include zinc, copper, manganese, cobalt, iron, tin, titanium, oxide containing silicon as a main component, carbide, and the above metal. An oxide composed of at least one kind of complex oxide such as perovskite type complex oxide is applied. Although the reason why the semiconductor material is excellent in absorption and heat generation characteristics of high frequency energy is not clear, it is considered that the semiconductor material has conductive characteristics and dielectric characteristics suitable for high frequency absorption.
【００３４】特に高周波吸収材１１として炭化珪素ウィ
スカーを用いた場合、排気ガスの浄化性能が最も優れて
おり（実施例１との比較）、このことから高周波エネル
ギの吸収・発熱特性が最も優れていることがわかる。さ
らに炭化珪素ウィスカーは排気ガス雰囲気での耐熱性、
化学的安定性に優れており、高い信頼性を実現すること
ができる。In particular, when silicon carbide whiskers are used as the high-frequency absorber 11, the exhaust gas purification performance is the best (compared with the first embodiment), which shows that the high-frequency energy absorption and heat generation properties are the best. You can see that Furthermore, silicon carbide whiskers have heat resistance in an exhaust gas atmosphere,
It has excellent chemical stability and can achieve high reliability.
【００３５】なお、本発明の高周波発熱体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 of the present invention can also be used as a means for decomposing oil fumes and odors discharged from a cooking device such as an oven microwave oven.
【００３６】[0036]
【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 the catalytic function of the present invention, the following effects can be obtained.
【００３７】（１）高周波発熱体を構成するセラミック
支持体としてセラミック粒子からなる成型体を用いた場
合、高周波エネルギは前記セラミック支持体の表面に被
覆している高周波吸収材によって吸収されるので、前記
高周波発熱体の表面近傍（セラミック微粒子と触媒を含
む）が選択的に加熱され、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るとともに、セラミック微
粒子によって比表面積を大きくすることができるので、
触媒活性が高くなり、優れた排気ガスの浄化性能を実現
することができる。(1) When a molded body made of ceramic particles is used as the ceramic support which constitutes the high-frequency heating element, the high-frequency energy is absorbed by the high-frequency absorber coated on the surface of the ceramic support. The vicinity of the surface of the high-frequency heating element (including the ceramic fine particles and the catalyst) is selectively heated and can be heated to a temperature that functions as a catalyst in a short time, and the specific surface area can be increased by the ceramic fine particles. So
The catalytic activity becomes high, and excellent exhaust gas purification performance can be realized.
【００３８】（２）高周波発熱体を構成するセラミック
支持体としてセラミック繊維からなる成型体を用いた場
合、前記セラミック支持体が多孔質構造となり、前記高
周波発熱体自身の熱容量を小さくすることができるの
で、より短時間で触媒として機能する温度に加熱させる
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) When a molded body made of ceramic fibers is used as the ceramic support constituting the high-frequency heating element, the ceramic support has a porous structure, and the heat capacity of the high-frequency heating element itself can be reduced. Therefore, it can be heated to a temperature that functions as a catalyst in a shorter time, and excellent exhaust gas purification performance can be obtained.
【００３９】（３）高周波吸収材として高周波エネルギ
の吸収・発熱特性に優れた炭化珪素ウィスカーを用いる
ことにより、触媒の加熱速度を速くし排気ガスの浄化性
能を向上させることができるとともに、耐熱性、化学的
安定性が高いので排気ガスの浄化性能の持続など高い信
頼性を実現することができる。(3) By using a silicon carbide whisker having a high-frequency energy absorption / exothermic property as the high-frequency absorber, the catalyst heating rate can be increased to improve the exhaust gas purification performance and the heat resistance. Since the chemical stability is high, high reliability such as continuous exhaust gas purification performance can be realized.
【図１】本発明の一実施例における高周波発熱体の外観
図FIG. 1 is an external view of a high-frequency heating element according to an embodiment of the present invention.
【図２】本発明の一実施例における高周波発熱体の一部
断面図FIG. 2 is a partial sectional view of a high-frequency heating element according to an embodiment of the present invention.
【図３】本発明の高周波発熱体の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 of the present invention.
【図４】従来の排ガス浄化装置の構成図FIG. 4 is a configuration diagram of a conventional exhaust gas purification device.
９ 高周波発熱体 １０ セラミック支持体 １１ 高周波吸収材 １２ セラミック微粒子 １３ 触媒 １４ セラミック繊維 9 High Frequency Heating Element 10 Ceramic Support 11 High Frequency Absorber 12 Ceramic Fine Particles 13 Catalyst 14 Ceramic Fiber
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０１Ｎ 3/20 ＺＡＢ Ｋ 3/28 ＺＡＢ ３０１ Ｐ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location F01N 3/20 ZAB K 3/28 ZAB 301 P
Claims (9)
体に被覆された高周波エネルギを吸収し発熱する高周波
吸収材と、前記セラミック支持体と前記高周波吸収材で
構成される表面に被覆されたセラミック微粒子と、前記
セラミック支持体と前記高周波吸収材と前記セラミック
微粒子で構成される表面に担持された触媒とからなる触
媒機能を有する高周波発熱体。1. A ceramic support, a high-frequency absorbing material coated on the ceramic support to absorb high-frequency energy and generate heat, and ceramic fine particles coated on the surface composed of the ceramic support and the high-frequency absorbing material. And a high frequency heating element having a catalytic function comprising the ceramic support, the high frequency absorbing material, and a catalyst supported on the surface composed of the ceramic fine particles.
体からなる請求項１記載の触媒機能を有する高周波発熱
体。2. The high-frequency heating element having a catalytic function according to claim 1, wherein the ceramic support is a molded body of ceramic particles.
体からなる請求項１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 ceramic support is a ceramic fiber molding.
を有する成型体からなる請求項１ないし請求項３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 ceramic support is a molded body having pores through which gas can pass.
１ないし請求項３記載の触媒機能を有する高周波発熱
体。5. A high frequency heating element having a catalytic function according to claim 1, wherein the high frequency absorbing material is made of a semiconductor material.
ルト、鉄、スズ、チタン、珪素を主成分とする酸化物、
炭化物、及び前記金属を含む複合酸化物の少なくとも１
種からなる請求項１ないし請求項３記載の触媒機能を有
する高周波発熱体。6. The high frequency absorbing material is an oxide containing zinc, copper, manganese, cobalt, iron, tin, titanium and silicon as a main component,
At least one of carbide and complex oxide containing the metal
A high-frequency heating element comprising a seed and having a catalytic function according to claim 1.
る請求項１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 high frequency absorbing material is made of silicon carbide whiskers.
コニアの少なくとも１種からなる請求項３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 3, wherein the ceramic fiber is made of at least one of alumina, silica and zirconia.
属及び銅、マンガン、コバルト、鉄の金属酸化物の少な
くとも１種からなる請求項１記載の触媒機能を有する高
周波発熱体。9. A high-frequency heating element having a catalytic function according to claim 1, wherein the catalyst is composed of a noble metal such as platinum, rhodium or palladium and at least one metal oxide of copper, manganese, cobalt or iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4281485A JPH06126190A (en) | 1992-10-20 | 1992-10-20 | High-frequency heating element having catalytic function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4281485A JPH06126190A (en) | 1992-10-20 | 1992-10-20 | High-frequency heating element having catalytic function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06126190A true JPH06126190A (en) | 1994-05-10 |
Family
ID=17639848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4281485A Pending JPH06126190A (en) | 1992-10-20 | 1992-10-20 | High-frequency heating element having catalytic function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06126190A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017131851A (en) * | 2016-01-29 | 2017-08-03 | 日本特殊陶業株式会社 | Catalyst material for microwave heating, catalyzer for microwave heating, and production method |
| JP2018176091A (en) * | 2017-04-17 | 2018-11-15 | 日本特殊陶業株式会社 | Catalyst material for microwave heating, catalyst body for microwave heating, and manufacturing method of catalyst body for microwave heating |
| CN114644845A (en) * | 2022-04-08 | 2022-06-21 | 中国科学院过程工程研究所 | Heat-conducting catalyst coating and preparation method and application thereof |
-
1992
- 1992-10-20 JP JP4281485A patent/JPH06126190A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017131851A (en) * | 2016-01-29 | 2017-08-03 | 日本特殊陶業株式会社 | Catalyst material for microwave heating, catalyzer for microwave heating, and production method |
| JP2018176091A (en) * | 2017-04-17 | 2018-11-15 | 日本特殊陶業株式会社 | Catalyst material for microwave heating, catalyst body for microwave heating, and manufacturing method of catalyst body for microwave heating |
| CN114644845A (en) * | 2022-04-08 | 2022-06-21 | 中国科学院过程工程研究所 | Heat-conducting catalyst coating and preparation method and application thereof |
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