JPH0471620A - High-frequency heating exhaust gas purifier - Google Patents
High-frequency heating exhaust gas purifierInfo
- Publication number
- JPH0471620A JPH0471620A JP2180849A JP18084990A JPH0471620A JP H0471620 A JPH0471620 A JP H0471620A JP 2180849 A JP2180849 A JP 2180849A JP 18084990 A JP18084990 A JP 18084990A JP H0471620 A JPH0471620 A JP H0471620A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- frequency power
- absorbing material
- gas purification
- 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 41
- 239000003054 catalyst Substances 0.000 claims abstract description 99
- 238000000746 purification Methods 0.000 claims abstract description 60
- 239000011358 absorbing material Substances 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052878 cordierite Inorganic materials 0.000 claims description 7
- 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 claims description 7
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 63
- 239000010419 fine particle Substances 0.000 description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- 239000010948 rhodium Substances 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
- F01N3/202—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means using microwaves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、たとえば自動車エンジン等から排出される未
燃焼の炭化水素、−酸化炭素、窒素酸化物を完全燃焼さ
せ、炭酸ガスと窒素、水に分解する排ガス浄化装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention completely burns unburned hydrocarbons, carbon oxides, and nitrogen oxides discharged from automobile engines, etc., and decomposes them into carbon dioxide, nitrogen, and water. The present invention relates to an exhaust gas purification device.
従来の技術
従来のこの種の排ガス浄化装置は、コーディエライトな
どの高密度のセラミックハニカム構造体の表面に表面積
を大きくするためにアルミナなどの微粒子をコーティン
グし、その上に白金、ロジウム、パラジウムなどの貴金
属触媒を担持した排ガス浄化触媒体を、自動車エンジン
から発生する排熱、又は電気ヒータなどの加熱手段を用
いて高温度化し、未燃焼ガスの炭化水素、−酸化炭素、
窒素酸化物を完全燃焼させ炭酸ガスと窒素、水とに分解
するようにしていた。Conventional technology Conventionally, this type of exhaust gas purification device coats the surface of a high-density ceramic honeycomb structure such as cordierite with fine particles such as alumina to increase the surface area, and coats the surface with fine particles such as alumina. An exhaust gas purification catalyst supporting a noble metal catalyst such as
Nitrogen oxides were completely combusted and decomposed into carbon dioxide, nitrogen, and water.
発明が解決しようとする課題
しかしながら上記のような排ガス浄化触媒を、自動車エ
ンジンから発生する排熱で高温度化する場合、排ガス浄
化触媒体が触媒として機能する温度まで加熱されるのに
時間を要し、その間に未燃焼ガスが発生し通過していく
、使用初期の段階で未燃焼ガスを完全燃焼させることが
できない、電気ヒータなどの加熱手段を用いる場合も、
排ガス浄化触媒体を外周から加熱するので急速に温度を
立上らすことはできず、排熱を利用するものと同様の課
題があった。Problems to be Solved by the Invention However, when raising the temperature of the exhaust gas purification catalyst as described above using exhaust heat generated from an automobile engine, it takes time for the exhaust gas purification catalyst body to be heated to a temperature at which it functions as a catalyst. However, unburned gas is generated and passes through during that time, and it is not possible to completely burn the unburned gas during the initial stage of use.When using heating means such as electric heaters,
Since the exhaust gas purification catalyst body is heated from the outer periphery, the temperature cannot be raised rapidly, and there are problems similar to those using exhaust heat.
課題を解決するための手段
上記課題を解決するために本発明の高周波加熱排ガス浄
化装置は、セラミックハニカム構造体の触媒担持体にア
ルミナなどの微粒子で高周波電力吸収材料をコーティン
グし、その表面に貴金属などの浄化触媒を担持して排ガ
ス浄化触媒体を構成し、排ガス浄化触媒体に高周波を給
電して、触媒担持体表面の高周波電力吸収材料そのもの
が発熱し、表面に担持された浄化触媒が機能する温度に
急速に加熱されるようにしたものである。Means for Solving the Problems In order to solve the above problems, the high-frequency heating exhaust gas purification device of the present invention coats a high-frequency power absorbing material with fine particles such as alumina on a catalyst support of a ceramic honeycomb structure, and coats a high-frequency power absorbing material with fine particles such as alumina on the surface thereof. An exhaust gas purification catalyst body is formed by supporting a purification catalyst such as, and when high frequency power is supplied to the exhaust gas purification catalyst body, the high frequency power absorption material itself on the surface of the catalyst support generates heat, and the purification catalyst supported on the surface functions. It is designed so that it can be rapidly heated to a certain temperature.
作用
高周波を利用した高周波加熱は、被加熱物が高周波電力
を吸収し自から誘電加熱又は電気抵抗加熱などの高周波
損失で発熱するものである。この場合被加熱物の材料は
比誘電率と誘電体損失が大きいが、高周波による磁性体
損失が大きくないと、高周波電力を効率よく吸収せず急
速な発熱をしない、従来の排ガス浄化触媒体に用いられ
ている触媒担持体はコーディエライト又はムライトが一
般的であるが、これらの材料は比誘電率と誘電体損失角
の値が小さく高周波加熱には適さない。In high-frequency heating using high-frequency action, the object to be heated absorbs high-frequency power and generates heat by itself through high-frequency losses such as dielectric heating or electric resistance heating. In this case, the material to be heated has a large dielectric constant and dielectric loss, but unless the magnetic loss due to high frequency is large, the conventional exhaust gas purification catalyst will not absorb high frequency power efficiently and will not generate heat rapidly. Cordierite or mullite is generally used as the catalyst carrier, but these materials have small values of dielectric constant and dielectric loss angle, and are not suitable for high-frequency heating.
比誘電率と誘電体損失角の値が大きいか、高周波による
磁性体損失の大きいかなどの高周波電力吸収材料を触媒
担持体の表面に用い、その上に浄化触媒を担持して排ガ
ス浄化触媒体を構成し、この排ガス浄化触媒体に高周波
給電口であるマグネトロンから発振した高周波を給電す
ると、触媒担持体表面の高周波電力吸収材料は自己発熱
し、しかも内部発熱であるので外部に逃げる余分な熱が
ほとんどなく、排ガス浄化触媒体は触媒として機能する
温度まで急速に加熱される。触媒担持体の表面にコーテ
ィングされた高周波電力吸収材料は極めて薄く、発熱体
としての熱容量は小さいため短時間で高温に発熱し易い
、しかも浄化触媒はその表面に担持され同時に高温にな
るとともに、触媒担持体を構成しているセラミック体は
熱絶縁の役割を果し、浄化触媒が急速に高温度化する。A high-frequency power absorbing material with a large relative dielectric constant and dielectric loss angle, or a large magnetic loss due to high frequencies is used on the surface of the catalyst support, and a purification catalyst is supported on the material to form an exhaust gas purification catalyst. When this exhaust gas purification catalyst body is supplied with high frequency waves oscillated from a magnetron, which is a high frequency power supply port, the high frequency power absorbing material on the surface of the catalyst carrier self-heats, and since it is internal heat generation, excess heat escapes to the outside. The exhaust gas purification catalyst body is rapidly heated to a temperature at which it functions as a catalyst. The high-frequency power absorbing material coated on the surface of the catalyst carrier is extremely thin and has a small heat capacity as a heating element, so it easily heats up to a high temperature in a short time. The ceramic body constituting the carrier serves as a thermal insulator, and the temperature of the purification catalyst increases rapidly.
未燃焼ガスを含む排ガス気流中に配置された本発明の高
周波加熱排ガス浄化装置は、高周波が給電されることに
より触媒として機能する温度まで急速に加熱され、運転
開始時の未燃焼ガスが分解されずに通過することを防ぐ
。The high-frequency heating exhaust gas purification device of the present invention, which is placed in an exhaust gas stream containing unburned gas, is rapidly heated to a temperature at which it functions as a catalyst by being supplied with high-frequency power, and the unburned gas at the start of operation is decomposed. This prevents the vehicle from passing without passing.
実施例
以下、本発明の一実施例を添付図面にもとづいて説明す
る。第１図において、１は高周波が給電され被加熱物が
加熱される加熱室、２は加熱室１に高周波を給電する高
周波発振源であるマグネトロン、３はマグネトロン２よ
り発振した高周波を加熱室１へ導く導波管、４は導波管
３の開口で加熱室１への高周波給電口、５は加熱室１を
構成するもので排ガスの入口側にある吸気壁、６は同じ
く出口側にある排気壁である。加熱室ｌは高周波の共振
箱として作用し、高周波を閉じ込め漏電しないように耐
熱性のあるステンレス鋼などの金属板で構成されている
。加熱室１の一部を構成する吸気壁５と排気壁６も高周
波が漏洩しない金属材料でなり、排ガスが流れるよう金
網やパンチングメタルなどの金属透過体で形成されてい
る。７は排ガス流入口、８は同しく排気口である。この
ような構成の高周波加熱装置の加熱室ｌ内で吸気壁５側
に、触媒担持体の表面に高周波電力吸収材料をコーティ
ングした排ガス浄化触媒体９を設けたものが本発明の高
周波加熱排ガス浄化装置である。Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Fig. 1, numeral 1 indicates a heating chamber to which high frequency waves are supplied to heat the object to be heated, 2 indicates a magnetron which is a high frequency oscillation source that supplies high frequency waves to the heating chamber 1, and 3 indicates a high frequency wave oscillated by the magnetron 2 to the heating chamber 1. 4 is the opening of the waveguide 3 and is a high-frequency power feeding port to the heating chamber 1; 5 is the intake wall that constitutes the heating chamber 1 and is on the exhaust gas inlet side; 6 is also on the exit side This is an exhaust wall. The heating chamber 1 acts as a high frequency resonance box and is made of a heat-resistant metal plate such as stainless steel to confine high frequencies and prevent electrical leakage. The intake wall 5 and the exhaust wall 6, which constitute a part of the heating chamber 1, are also made of a metal material that does not leak high-frequency waves, and are made of a metal transparent material such as a wire mesh or punched metal so that the exhaust gas flows. 7 is an exhaust gas inlet, and 8 is an exhaust port. The high-frequency heating exhaust gas purification device of the present invention has an exhaust gas purification catalyst body 9 in which the surface of the catalyst carrier is coated with a high-frequency power absorbing material on the side of the intake wall 5 in the heating chamber l of the high-frequency heating device having such a configuration. It is a device.
排ガス浄化触媒体９は、触媒担持体としてコーディエラ
イト又はムライトの高密度セラミックハニカム構造体を
用い、表面にアルミナなどの微粒子で１例としてチタン
酸バリュームＢ ａ Ｔ ｉ Ｏｓの高周波電力吸収材
料をコーティングしている。The exhaust gas purification catalyst body 9 uses a high-density ceramic honeycomb structure of cordierite or mullite as a catalyst support, and has fine particles such as alumina on the surface and a high-frequency power absorbing material such as titanate barum B a Ti Os as an example. It is coated.
その上に白金、ロジューム、パラジウムなどの貴金属触
媒、又はペロブスカイト型複合酸化物触媒が担持されて
いる。チタン酸バリニームＢａＴｉ０１は比誘電率と誘
電体損失角の値が大きく、高周波の給電で高周波電力を
よく吸収し２速に発熱する。A noble metal catalyst such as platinum, rhodium, palladium, or a perovskite-type composite oxide catalyst is supported thereon. Balineal titanate BaTi01 has large values of relative dielectric constant and dielectric loss angle, and absorbs high frequency power well when supplied with high frequency power and generates heat in a second speed.
他の実施例として、触媒担持体の表面にフェライトＭＯ
，Ｆｅｘ Ｏｓ又はＦｅ５Ｏａの高周波電力吸収材料を
コーティングする手段もある０ＭはＣｕ、Ｍｇ、Ｍｎ、
Ｎｉなどの２価金属である。As another example, ferrite MO is applied to the surface of the catalyst carrier.
, FexOs or Fe5Oa.0M is Cu, Mg, Mn,
It is a divalent metal such as Ni.
フェライトはマイクロ波領域の高周波に対しては磁性体
損失を大きくすることができ、高周波電力吸収材料とし
て効果的である。Ferrite can increase magnetic loss for high frequencies in the microwave region, and is effective as a high-frequency power absorbing material.
シリコンカーバイ）ＳｉＣも高周波電力吸収材料として
触媒担持体の表面にコーティングして用いることができ
る。シリコンカーバイトＳｉＣは、純粋の単結晶では高
い絶縁性を表すが、焼き固めたセラミック体の微粒子は
多くの欠陥を有し、この欠陥からエレクトロンを供給す
るため適当な導電性を表し、高周波電力吸収材料となる
。Silicon carbide (SiC) can also be used as a high-frequency power absorbing material by coating it on the surface of a catalyst support. Silicon carbide SiC exhibits high insulating properties as a pure single crystal, but the fine particles of the fired ceramic body have many defects, and as electrons are supplied from these defects, it exhibits appropriate conductivity and is suitable for high-frequency power. Becomes an absorbent material.
排ガス浄化触媒体９は、上記の如く触媒担持体としてセ
ラミックハニカム構造体の表面にチタン酸バリニームＢ
ａＴｉＯｓなどの高周波電力吸収材料をコーティングし
、その上に貴金属触媒などを担持する構成を示したが、
触媒担持体の高密度セラミックハニカムなどの微粒子を
コーティングし、その上にチタン酸バリニームＢａＴｉ
○、などの高周波電力吸収材料と白金、ロジューム、パ
ラジュームなどの貴金属触媒又は他の浄化触媒とを混練
して同時に担持しても同し効果が得られる。As described above, the exhaust gas purification catalyst body 9 is made of titanate barineal B on the surface of the ceramic honeycomb structure as a catalyst support.
Although we have shown a structure in which a high-frequency power absorbing material such as aTiOs is coated and a noble metal catalyst is supported on it,
Fine particles such as high-density ceramic honeycomb as a catalyst support are coated, and BaTi titanate is coated on top.
The same effect can be obtained by kneading and simultaneously supporting a high-frequency power absorbing material such as ◯ and a noble metal catalyst such as platinum, rhodium, palladium, or other purifying catalyst.
この場合加工工程の減少効果もある。In this case, there is also the effect of reducing processing steps.
１０は加熱室１内で、排ガス浄化触媒体９より排気壁６
側に設けられた第２排ガス浄化触媒体である。第２排ガ
ス浄化触媒体１０は、触媒担持体として同じくコーディ
エライト又はムライトの高密度セラミックハニカム構造
体を用い、表面に表面積を大きくするためのアルミナな
どの微粒子をコーティングし、その上に白金、ロジウム
、パラジウムなどの貴金属触媒又はペロブスカイト型複
合酸化物触媒を担持している。排ガス浄化触媒体９を未
燃焼ガスが流れて触媒機能で分解するとき発生する分解
熱、又は高温になった自動車エンジンの排熱で加熱され
、触媒としての機能を発揮する。10 is located within the heating chamber 1, and is connected to the exhaust wall 6 from the exhaust gas purification catalyst body 9.
This is a second exhaust gas purification catalyst body provided on the side. The second exhaust gas purification catalyst body 10 uses a high-density ceramic honeycomb structure made of cordierite or mullite as a catalyst carrier, and coats fine particles such as alumina on the surface to increase the surface area, and coats the surface with fine particles such as alumina, etc. Supports a noble metal catalyst such as rhodium or palladium or a perovskite-type composite oxide catalyst. The exhaust gas purification catalyst body 9 is heated by the decomposition heat generated when unburned gas flows and is decomposed by the catalytic function, or by the exhaust heat of a high-temperature automobile engine, and functions as a catalyst.
高周波を給電し急速に発熱させ短時間で触媒が機能する
温度まで立上らすためには、排ガス浄化触媒体９は熱容
量を小さくする必要があり、触媒担持体の大きさ重量は
余り増せない、従って排ガス浄化触媒体９の容積は、第
２排ガス浄化触媒体１０の容積より小さくしている未燃
焼ガスを大量に含む排ガスが流れ始めると浄化触媒体の
表面積は大きなものが望まれ、第２排ガス浄化触媒体１
０が有効に作用する。触媒担持体の表面にコーティング
された高周波電力吸収材料は薄い膜状であるため、排ガ
ス浄化触媒体９の発熱体としての熱容量は小さく、短時
間で高い温度まで立上らす構成でもある。In order to supply high-frequency power and rapidly generate heat to reach a temperature at which the catalyst functions in a short time, the exhaust gas purification catalyst body 9 must have a small heat capacity, and the size and weight of the catalyst carrier cannot be increased much. Therefore, the volume of the exhaust gas purification catalyst body 9 is made smaller than the volume of the second exhaust gas purification catalyst body 10. When exhaust gas containing a large amount of unburned gas starts to flow, a large surface area of the purification catalyst body is desired, and 2 Exhaust gas purification catalyst body 1
0 works effectively. Since the high frequency power absorbing material coated on the surface of the catalyst carrier is in the form of a thin film, the heat capacity of the exhaust gas purification catalyst body 9 as a heating element is small, and the structure is such that it can rise to a high temperature in a short time.
高周波に対し加熱室１は共振箱として作用し、内部に定
在波が立つ、電界の強い点は、使用している周波数によ
って決る波長の４分の１以上加熱室１の壁面から離れた
ところにある。高周波電力吸収材料を有する排ガス浄化
触媒体９は、電界の強い点に配置される方が効果的で、
排ガスの入口側金属透過体である吸気壁５との間に４分
の１波長以上の間隙を設けている。The heating chamber 1 acts as a resonant box for high frequencies, and standing waves are generated inside.The point where the electric field is strong is at least a quarter of the wavelength determined by the frequency being used, away from the wall of the heating chamber 1. It is in. The exhaust gas purification catalyst body 9 having a high-frequency power absorbing material is more effective when placed at a point where the electric field is strong.
A gap of 1/4 wavelength or more is provided between the intake wall 5, which is a metal transmitting body on the inlet side of the exhaust gas.
高周波はインピーダンスの急激な変化面では反射する。High frequencies are reflected on surfaces with sudden changes in impedance.
従って導波管３の開口を直接排ガス浄化触媒体９の近傍
にもってくると、効果的高周波電力の吸収が行われない
、又高周波は進行波でもあり、給電面に近い物体から吸
収されていく。このため高周波電力吸収材料を有する排
ガス浄化触媒体９近傍の空隙に給電することが効果的で
、吸気壁５と排ガス浄化触媒体９との間隙に高周波給電
口４を設けている。Therefore, if the opening of the waveguide 3 is placed directly near the exhaust gas purification catalyst 9, effective absorption of high-frequency power will not take place, and high-frequency waves are also traveling waves and will be absorbed from objects close to the power supply surface. . For this reason, it is effective to supply power to the gap near the exhaust gas purification catalyst body 9 having a high frequency power absorbing material, and the high frequency power feed port 4 is provided in the gap between the intake wall 5 and the exhaust gas purification catalyst body 9.
このような構成の高周波排ガス浄化装置であれば、未燃
焼ガスを含む排ガスが自動車エンジンから流れる直前又
は流れ始めて直後、マグネトロン２を発振させ加熱室１
に高周波を給電すると、排ガス浄化触媒体９の触媒担持
体の表面にコーティングされた高周波電力吸収材料が誘
電加熱又は高周波による磁性体損失で自己発熱し、しか
も内部発熱であるので、排ガス浄化触媒体９の表面は触
媒として機能する温度まで短時間に発熱し、未燃焼ガス
を分解する。未燃焼ガスの通過を防ぐか、未燃焼ガスの
通過量を減少させることができる。In a high-frequency exhaust gas purification device having such a configuration, the magnetron 2 is oscillated immediately before the exhaust gas containing unburned gas flows from the automobile engine, or immediately after the exhaust gas starts to flow.
When high frequency power is supplied to the exhaust gas purification catalyst body 9, the high frequency power absorbing material coated on the surface of the catalyst carrier of the exhaust gas purification catalyst body 9 self-heats due to dielectric heating or loss of magnetic material due to high frequency. The surface of No. 9 generates heat in a short time to a temperature at which it functions as a catalyst, decomposing unburned gas. The passage of unburned gas can be prevented or the amount of unburned gas passing can be reduced.
第２図ａ、ｂは、排ガス浄化触媒体９の実施例を示す拡
大断面図である。第２図ａにおいて１１は触媒担持体で
、コーチデイエライトなどのセラミックハニカム構造体
で構成しガス透過孔１４を有している。１２が触媒担持
体１１の表面にアルミナなどの微粒子でコーティングさ
れたチタン酸バリュームＢａＴｉＯ３などの高周波電力
吸収材料である。FIGS. 2a and 2b are enlarged sectional views showing an example of the exhaust gas purification catalyst body 9. FIG. In FIG. 2a, reference numeral 11 denotes a catalyst carrier, which is made of a ceramic honeycomb structure such as coch-dayerite and has gas permeation holes 14. 12 is a high frequency power absorbing material such as barum titanate BaTiO3 coated with fine particles such as alumina on the surface of the catalyst support 11.
１３は高周波電力吸収材料１２の表面に担持された貴金
属などの浄化触媒である。第２図すにおいて、１５は同
じく触媒担持体でガス透過孔１７を存している。１６は
高周波電力吸収材料と浄化触媒とを混練して、触媒担持
体１５の表面に同時に担持した高周波電力吸収浄化触媒
体である。このように触媒担持体１１又は１５の表面に
高周波電力吸収材料１２又は高周波電力吸収浄化触媒体
１６を薄い膜状でコーティングした排ガス浄化触媒体９
を、加熱室１の中に設けて高周波を給電するようにした
ものが本発明の高周波加熱排ガス浄化装置である。13 is a purification catalyst such as a noble metal supported on the surface of the high frequency power absorbing material 12. In FIG. 2, reference numeral 15 is also a catalyst carrier having gas permeation holes 17. Reference numeral 16 denotes a high frequency power absorption purification catalyst body in which a high frequency power absorption material and a purification catalyst are kneaded and simultaneously supported on the surface of the catalyst carrier 15. In this way, the exhaust gas purification catalyst body 9 is formed by coating the surface of the catalyst support 11 or 15 with the high frequency power absorbing material 12 or the high frequency power absorbing purification catalyst body 16 in a thin film form.
The high frequency heating exhaust gas purification device of the present invention is provided in the heating chamber 1 and is supplied with high frequency power.
発明の効果
以上のように本発明の高周波加熱排ガス浄化装置によれ
ば、次の効果が得られる。Effects of the Invention As described above, according to the high frequency heating exhaust gas purification device of the present invention, the following effects can be obtained.
（１） 自動車エンジンからの排熱、又は電気ヒータ
を用いた加熱手段からの熱による外部加熱と異なり、触
媒担持体の表面にある高周波電力吸収材料又高周波電力
吸収浄化触媒体自体の内部発熱であるので、触媒が活性
機能を表す温度まで立上る時間が短い。(1) Unlike external heating due to exhaust heat from an automobile engine or heat from a heating means using an electric heater, internal heat generation from the high-frequency power absorbing material on the surface of the catalyst support or the high-frequency power absorbing purification catalyst body itself Therefore, the time required for the catalyst to rise to the temperature exhibiting its active function is short.
（２）高周波電力吸収材料は薄い膜でコーティングされ
ているので、熱容量が小さく高温に栄、速に立上る。(2) Since the high-frequency power absorption material is coated with a thin film, it has a small heat capacity and rises quickly to high temperatures.
（３）運転初期の段階で排ガス浄化触媒体が急速に加熱
されるので、未燃焼ガスが分解されずに通過していくこ
とを防ぐか、未燃焼ガスの通過量を減少させることがで
きる。(3) Since the exhaust gas purification catalyst body is rapidly heated at the initial stage of operation, it is possible to prevent unburned gas from passing through without being decomposed or to reduce the amount of unburned gas passing through.
第１図は本発明の一寞施例を示す高周波加熱排ガス浄化
装置の側断面図、第２図（ａ）、（ｂｌは同装置の排ガ
ス浄化触媒体を示す拡大断面図である。
１・・・・・・加熱室、２・・・・・・マグネトロン、
４・・・・・・高周波給電口、９・・・・・・排ガス浄
化触媒体、１１，１５・・・・・・触媒担持体、１２・
・・・・・高周波電力吸収材料、１３・・・・・・浄化
触媒、１６・・・・・・高周波電力吸収浄化触媒体。
代理人の氏名 弁理士 粟野重孝 はか１名第 １！！
Ｉ
？
第２１１！１
ｃ山）
（ｂ）FIG. 1 is a side sectional view of a high-frequency heating exhaust gas purification device showing a first embodiment of the present invention, and FIG. ... Heating chamber, 2 ... Magnetron,
4... High frequency power supply port, 9... Exhaust gas purification catalyst body, 11, 15... Catalyst carrier, 12.
...High frequency power absorption material, 13 ... Purification catalyst, 16 ... High frequency power absorption purification catalyst body. Name of agent: Patent attorney Shigetaka Awano Haka 1 person 1st! !
I? No. 211!1 C mountain) (b)
Claims (4)
波を給電する高周波電源と、前記加熱室内に設けられた
ガス透過形状の触媒担持体とを備え、前記触媒担持体の
少なくとも一部表面に高周波電力吸収材料をコーティン
グし、この高周波電力吸収材料の上に排ガス浄化用触媒
を担持して、前記加熱室への排ガス入口及び出口に金属
透過体を設けた高周波加熱排ガス浄化装置。(1) A heating chamber to which high-frequency power is supplied, a high-frequency power supply to supply high-frequency power to the heating chamber, and a gas-permeable catalyst support provided in the heating chamber, and at least a portion of the catalyst support A high-frequency heating exhaust gas purification device, the surface of which is coated with a high-frequency power absorbing material, an exhaust gas purifying catalyst supported on the high-frequency power absorbing material, and metal transparent bodies provided at the exhaust gas inlet and outlet to the heating chamber.
トの表面にチタン酸バリュームＢａＴｉＯ＿３をコーテ
ィングしたセラミック体を用いた請求項１記載の高周波
加熱排ガス浄化装置。(2) The high-frequency heating exhaust gas purification device according to claim 1, wherein a ceramic body having a surface of cordierite or mullite coated with barum titanate BaTiO_3 is used as the catalyst carrier.
トの表面にフェライトをコーティングしたセラミック体
を用いた請求項１記載の高周波加熱排ガス浄化装置。(3) The high-frequency heating exhaust gas purification device according to claim 1, wherein a ceramic body having a surface of cordierite or mullite coated with ferrite is used as the catalyst carrier.
トの表面に、チタン酸バリュームＢａＴｉＯ＿３又はフ
ァライトの高周波電波吸収材料を排ガス浄化用触媒とを
混練して同時に担持した請求項１記載の高周波加熱排ガ
ス浄化装置。(4) High-frequency heating exhaust gas purification according to claim 1, wherein a high-frequency radio wave absorbing material of titanate barium BaTiO_3 or phallite is kneaded with an exhaust gas purification catalyst and simultaneously supported on the surface of cordierite or mullite as a catalyst support. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180849A JPH0471620A (en) | 1990-07-09 | 1990-07-09 | High-frequency heating exhaust gas purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180849A JPH0471620A (en) | 1990-07-09 | 1990-07-09 | High-frequency heating exhaust gas purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0471620A true JPH0471620A (en) | 1992-03-06 |
Family
ID=16090437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2180849A Pending JPH0471620A (en) | 1990-07-09 | 1990-07-09 | High-frequency heating exhaust gas purifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0471620A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05168950A (en) * | 1991-12-17 | 1993-07-02 | Zexel Corp | Combustion exhaust gas purification catalyst |
| JPH07222912A (en) * | 1994-02-15 | 1995-08-22 | Zexel Corp | Exhaust gas purifying device for vehicle |
| JP2007247477A (en) * | 2006-03-15 | 2007-09-27 | Nobuyasu Kondo | Exhaust gas treatment equipment and exhaust gas treatment method |
| JP2019173583A (en) * | 2018-03-27 | 2019-10-10 | トヨタ自動車株式会社 | Exhaust emission control device for vehicle |
| KR20220026732A (en) * | 2020-08-26 | 2022-03-07 | 주식회사 제이케이글로벌 | Catalyst Dust Collector |
| 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 |
-
1990
- 1990-07-09 JP JP2180849A patent/JPH0471620A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05168950A (en) * | 1991-12-17 | 1993-07-02 | Zexel Corp | Combustion exhaust gas purification catalyst |
| JPH07222912A (en) * | 1994-02-15 | 1995-08-22 | Zexel Corp | Exhaust gas purifying device for vehicle |
| JP2007247477A (en) * | 2006-03-15 | 2007-09-27 | Nobuyasu Kondo | Exhaust gas treatment equipment and exhaust gas treatment method |
| JP2019173583A (en) * | 2018-03-27 | 2019-10-10 | トヨタ自動車株式会社 | Exhaust emission control device for vehicle |
| KR20220026732A (en) * | 2020-08-26 | 2022-03-07 | 주식회사 제이케이글로벌 | Catalyst Dust Collector |
| 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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