JPH0871418A - Catalyst carrier for purification of exhaust gas and catalyst for purification of exhaust gas - Google Patents
Catalyst carrier for purification of exhaust gas and catalyst for purification of exhaust gasInfo
- Publication number
- JPH0871418A JPH0871418A JP6234213A JP23421394A JPH0871418A JP H0871418 A JPH0871418 A JP H0871418A JP 6234213 A JP6234213 A JP 6234213A JP 23421394 A JP23421394 A JP 23421394A JP H0871418 A JPH0871418 A JP H0871418A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- titanium oxide
- carrier
- tantalum
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車等の内燃機関、
あるいはボイラーや産業用廃棄物処理など各種の燃焼装
置から排出される排ガス中に含まれる炭化水素（Ｈ
Ｃ）、一酸化炭素（ＣＯ）、窒素酸化物（ＮＯX ）等の
有害ガスを浄化するのに用いられる排ガス浄化用触媒担
体、および排ガス中に含まれるとくに炭化水素が効率よ
く浄化できる排ガス浄化用触媒に関する。BACKGROUND OF THE INVENTION The present invention relates to an internal combustion engine for automobiles,
Alternatively, hydrocarbons (H) contained in exhaust gas discharged from various combustion devices such as boilers and industrial waste treatment
C), an exhaust gas purifying catalyst carrier used for purifying harmful gases such as carbon monoxide (CO), and nitrogen oxides (NO x ), and exhaust gas purifying capable of efficiently purifying particularly hydrocarbons contained in the exhaust gas For catalysts.
【０００２】[0002]
【従来の技術】従来、排ガス浄化用触媒として、アルミ
ナ等の多孔質担体に白金等の触媒金属を担持したものが
一般的に知られている。特開平５−２８５３８６号公報
では、セリウム、ジルコニウム、ネオジウム、ランタ
ン、およびアルミニウムの酸化物から選ばれる１種以上
の担体に、白金、パラジウム、ロジウム、ルテニウム、
イリジウム等の触媒金属を担持した触媒が開示されてい
る。この触媒によれば、排ガス中に含まれる炭化水素、
一酸化炭素、一酸化窒素（ＮＯ）を同時に浄化できる。2. Description of the Related Art Conventionally, as an exhaust gas-purifying catalyst, a catalyst in which a catalytic metal such as platinum is carried on a porous carrier such as alumina is generally known. In Japanese Unexamined Patent Publication No. 5-285386, platinum, palladium, rhodium, ruthenium, and platinum are added to one or more carriers selected from oxides of cerium, zirconium, neodymium, lanthanum, and aluminum.
A catalyst supporting a catalytic metal such as iridium is disclosed. According to this catalyst, hydrocarbons contained in exhaust gas,
It is possible to purify carbon monoxide and nitric oxide (NO) at the same time.
【０００３】また、特開平５−２５３４８３号公報で
は、アルミナからなる担体に銅−コバルトの複合酸化物
を担持した触媒が開示されている。この触媒によれば、
排ガス中に含まれる炭化水素、一酸化炭素を浄化でき
る。Further, JP-A-5-253483 discloses a catalyst in which a copper-cobalt complex oxide is supported on a carrier made of alumina. According to this catalyst,
It is possible to purify hydrocarbons and carbon monoxide contained in exhaust gas.
【０００４】これら上記従来の触媒では、担体として無
機質の多孔質担体が用いられている。これは、多孔質担
体が有するＢＥＴ比表面積の広さ、および固体酸性の強
さに着目して排ガスの浄化率向上を図ったものである。In these above-mentioned conventional catalysts, an inorganic porous carrier is used as a carrier. This is intended to improve the purification rate of exhaust gas by paying attention to the wide BET specific surface area of the porous carrier and the strength of solid acidity.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記従
来技術では、いずれも排ガス中のとくに炭化水素につい
て浄化（酸化）性能が十分ではなく、とくに自動車用排
ガス浄化触媒として用いるためには、更なる炭化水素浄
化性能の向上が望まれている。However, none of the above-mentioned prior arts has sufficient purification (oxidation) performance with respect to hydrocarbons in exhaust gas, and further carbonization is required for use as an exhaust gas purification catalyst for automobiles. Improvement of hydrogen purification performance is desired.
【０００６】本発明者等は、排ガス浄化のメカニズムに
ついてその基礎から鋭意研究した。そして、酸化チタン
の有する半導体特性に着目した。この特性をさらに向上
させることができれば高性能な排ガス浄化用触媒担体に
なるのではないかと考えた。そこで、酸化チタンの半導
体的性質を向上させるべく鋭意研究し、さらに前記酸化
チタンを用いる触媒について各種の系統的実験を重ねた
結果、本発明を成すに至ったものである。The present inventors diligently studied the mechanism of exhaust gas purification from the basics. Then, attention was paid to the semiconductor characteristics of titanium oxide. We thought that if this property could be further improved, it would become a high performance exhaust gas purification catalyst carrier. Therefore, as a result of intensive studies to improve the semiconducting properties of titanium oxide and various systematic experiments on the catalyst using titanium oxide, the present invention has been accomplished.
【０００７】本発明は、排ガス中の有害ガスを高効率で
浄化できる排ガス浄化用触媒担体の提供を目的とする。
また、さらに、本発明は、排ガス中のとくに炭化水素を
従来より低温から高効率で浄化できる排ガス浄化用触媒
の提供を目的とする。An object of the present invention is to provide a catalyst carrier for purifying exhaust gas, which can purify harmful gases in exhaust gas with high efficiency.
Still another object of the present invention is to provide a catalyst for purifying exhaust gas, which can purify hydrocarbons in exhaust gas from a lower temperature than before conventionally with high efficiency.
【０００８】[0008]
（第１発明）本第１発明の排ガス浄化用触媒担体は、タ
ンタルまたはニオブの少なくとも１種を固溶させた酸化
チタンからなる排ガス浄化用触媒担体であって、前記タ
ンタルまたはニオブの固溶量は、酸化チタンに対し、
０．５〜５モル％であることを特徴とする。(First invention) The exhaust gas purifying catalyst carrier of the first invention is an exhaust gas purifying catalyst carrier comprising titanium oxide in which at least one of tantalum and niobium is dissolved, and the solid solution amount of tantalum or niobium is Is for titanium oxide,
It is characterized by being 0.5 to 5 mol%.
【０００９】（第２発明）本第２発明の排ガス浄化用触
媒は、排ガス中の少なくとも炭化水素を浄化する排ガス
浄化用触媒であって、タンタルまたはニオブの少なくと
も１種を、酸化チタンに対し０．５〜５モル％固溶させ
た酸化チタンからなる担体と、前記担体に担持した白金
族金属の少なくとも一種以上とからなることを特徴とす
る。(Second Invention) The exhaust gas purifying catalyst of the second invention is an exhaust gas purifying catalyst for purifying at least hydrocarbons in exhaust gas, and contains at least one of tantalum and niobium in an amount of 0 to titanium oxide. The carrier is characterized by comprising a carrier composed of titanium oxide in a solid solution of 5 to 5 mol% and at least one or more platinum group metals supported on the carrier.
【００１０】[0010]
（第１発明の作用）酸化チタンは、チタンの電子価が２
価から４価まで変化することにより酸素量が変化する不
定比化合物である。このため、電子価が５価のタンタル
またはニオブの少なくとも１種をチタンの位置に配位さ
せる、すなわち固溶させることによりチタンの一部が３
価になり酸化チタンは不安定な形になる。不安定になっ
た酸化チタンは温度あるいは雰囲気の変化により酸素量
の変化が起こりやすくなるために半導体特性が向上す
る。この半導体特性が向上した酸化チタンは格子内の酸
素欠陥および電子の不足を生ぜしめ、担持する触媒金属
の活性を高めることができる。このために触媒担体とし
て優れた性能を発揮することができるものと推定され
る。(Operation of the First Invention) Titanium oxide has an electron valence of 2
It is a non-stoichiometric compound in which the amount of oxygen changes as the valence changes from tetravalent to tetravalent. Therefore, at least one kind of tantalum or niobium having an electron valence of 5 is coordinated to the position of titanium, that is, by solid solution, a part of titanium is converted into 3 parts.
It becomes valent and titanium oxide becomes unstable. Instable titanium oxide is likely to have a change in oxygen content due to changes in temperature or atmosphere, so that semiconductor characteristics are improved. Titanium oxide having improved semiconductor characteristics causes oxygen defects in the lattice and lack of electrons, and can enhance the activity of the catalytic metal supported. Therefore, it is presumed that the catalyst carrier can exhibit excellent performance.
【００１１】酸化チタンに固溶させるタンタルまたはニ
オブの少なくとも１種の量が酸化チタンに対し、０．５
モル％未満では酸化チタンの半導体特性の変化が少な
い。また、５モル％を越えるとタンタルまたはニオブの
単独酸化物が残り、この酸化物が担持する触媒金属の活
性を低下させるので好ましくない。このため、酸化チタ
ンに固溶させるタンタルまたはニオブの少なくとも１種
の量は、酸化チタンに対し、０．５〜５モル％とする。
さらに好ましくは、１〜３．５モル％がよい。この範囲
において、酸化チタンの半導体特性はさらに向上するた
め、さらに優れた触媒担体となる。The amount of at least one of tantalum and niobium which is solid-dissolved in titanium oxide is 0.5 with respect to titanium oxide.
If it is less than mol%, the change in the semiconductor characteristics of titanium oxide is small. On the other hand, if it exceeds 5 mol%, a single oxide of tantalum or niobium remains, which reduces the activity of the catalyst metal supported by this oxide, which is not preferable. Therefore, the amount of at least one of tantalum and niobium which is solid-dissolved in titanium oxide is 0.5 to 5 mol% with respect to titanium oxide.
More preferably, it is 1 to 3.5 mol%. Within this range, the semiconductor characteristics of titanium oxide are further improved, and the titanium oxide becomes an even more excellent catalyst carrier.
【００１２】（第２発明の作用）タンタル（Ｔａ）また
はニオブ（Ｎｂ）の少なくとも１種を固溶させた酸化チ
タンからなる担体は、本第１発明の作用に記した理由に
より、半導体特性が向上している。この半導体特性が向
上した酸化チタンと白金族金属との間では、従来の触媒
より電子の授受が起こりやすくなっている。このため
に、白金族金属として例えば白金が担持されてなる場
合、該白金の触媒としての活性が向上する。(Operation of Second Invention) A carrier made of titanium oxide in which at least one of tantalum (Ta) and niobium (Nb) is solid-solved has a semiconductor characteristic because of the reason described in the operation of the first invention. Has improved. Electrons are more easily exchanged between the titanium oxide having improved semiconductor characteristics and the platinum group metal than the conventional catalyst. Therefore, for example, when platinum is supported as the platinum group metal, the activity of the platinum as a catalyst is improved.
【００１３】すなわち、排ガス中の炭化水素は白金族金
属の電子が不足しているときに該白金族金属に吸着さ
れ、炭化水素中の炭素がラジカルを形成し、形成された
ラジカルに酸素が捕獲される。すなわち、炭化水素は酸
化される。この反応による酸化が起こりやすくなってい
るために、従来より低温から高効率で炭化水素の酸化が
可能であると推定される。That is, the hydrocarbon in the exhaust gas is adsorbed by the platinum group metal when the electrons of the platinum group metal are insufficient, the carbon in the hydrocarbon forms a radical, and the formed radical captures oxygen. To be done. That is, hydrocarbons are oxidized. Since oxidation due to this reaction is likely to occur, it is presumed that it is possible to oxidize hydrocarbons from a lower temperature than in the past with high efficiency.
【００１４】酸化チタンに固溶させるタンタルまたはニ
オブの少なくとも１種の量が酸化チタンに対し０．５モ
ル％未満では、酸化チタンの半導体特性の変化が少な
く、該酸化チタンに担持した白金族金属に対し電子の授
受が少ないために好ましくない。また、５モル％を越え
るとタンタルまたはニオブの単独酸化物が残り、この酸
化物が白金族金属の活性を低下させるために好ましくな
い。このため、酸化チタンに固溶させるタンタルまたは
ニオブの少なくとも１種の量は、酸化チタンに対し、
０．５〜５モル％とする。さらに好ましくは、１〜３．
５モル％がよい。この範囲において、酸化チタンの半導
体特性はさらに向上し、担持した白金族金属に対し電子
の授受がさらに増大するために触媒活性がさらに向上す
る。When the amount of at least one of tantalum and niobium solid-dissolved in titanium oxide is less than 0.5 mol% with respect to titanium oxide, the change in semiconductor characteristics of titanium oxide is small and the platinum group metal supported on the titanium oxide is small. On the other hand, it is not preferable because the transfer of electrons is small. On the other hand, if it exceeds 5 mol%, a single oxide of tantalum or niobium remains, and this oxide lowers the activity of the platinum group metal, which is not preferable. Therefore, the amount of at least one kind of tantalum or niobium which is solid-dissolved in titanium oxide is
It is 0.5 to 5 mol%. More preferably, 1-3.
5 mol% is good. In this range, the semiconductor properties of titanium oxide are further improved, and the electron transfer to and from the supported platinum group metal is further increased, so that the catalytic activity is further improved.
【００１５】[0015]
（本第１発明の効果）本第発明によれば、排ガス中の有
害ガスを高効率で浄化できる排ガス浄化用触媒担体を提
供することができる。(Effect of the First Invention) According to the present invention, it is possible to provide an exhaust gas purifying catalyst carrier that can purify harmful gases in exhaust gas with high efficiency.
【００１６】（本第２発明の効果）本第２発明によれ
ば、排ガス中のとくに炭化水素を低温から高効率で浄化
できる排ガス浄化用触媒を提供することができる。(Effect of the Second Aspect of the Invention) According to the second aspect of the present invention, it is possible to provide an exhaust gas purifying catalyst capable of purifying hydrocarbons in exhaust gas from low temperatures with high efficiency.
【００１７】[0017]
（発明の具体例）本第１発明において、酸化チタンにタ
ンタルおよび／またはニオブを固溶させるには、酸化チ
タンと、タンタルおよび／またはニオブを混合し、１２
００℃以上の温度で固相反応させることにより行うこと
ができる。温度が１２００℃未満では、未反応のタンタ
ルおよび／またはニオブの酸化物が残るために好ましく
ない。好ましくは、１３００〜１４００℃の温度範囲が
よい。この範囲において、固相反応を効率よく経済的に
進行させることができる。ここにおいて、準備する酸化
チタン、タンタルおよび／またはニオブの形状はとくに
限定しない。例えば、粉末、粒状等のものを用いること
ができる。(Specific Example of the Invention) In the first invention, in order to form a solid solution of tantalum and / or niobium in titanium oxide, titanium oxide is mixed with tantalum and / or niobium.
It can be performed by carrying out a solid phase reaction at a temperature of 00 ° C. or higher. If the temperature is less than 1200 ° C., unreacted tantalum and / or niobium oxide remains, which is not preferable. The temperature range of 1300 to 1400 ° C. is preferable. Within this range, the solid-phase reaction can proceed efficiently and economically. Here, the shapes of titanium oxide, tantalum, and / or niobium to be prepared are not particularly limited. For example, powder, granules or the like can be used.
【００１８】また、酸化チタン以外にも半導体特性をも
つものは酸化チタンに代えて利用することができる可能
性がある。この場合、タンタルおよび／またはニオブを
固溶させることができるものであればさらに好ましい。In addition to titanium oxide, those having semiconductor characteristics may be used in place of titanium oxide. In this case, it is more preferable if tantalum and / or niobium can be solid-dissolved.
【００１９】また、前記固相反応の結果調製された触媒
担体は例えば粉末状または圧粉成形してペレット状にし
て用いてもよい。該粉末状またはペレット状の触媒担体
に触媒金属を担持して触媒とすることができる。また、
該触媒担体をコージエライト、アルミナ等のハニカムに
コートして用いることもできる。該ハニカムに触媒金属
を担持して触媒とすることができる。The catalyst carrier prepared as a result of the solid phase reaction may be used, for example, in the form of powder or compacted powder and pelletized. A catalyst can be prepared by supporting a catalyst metal on the powder or pellet catalyst carrier. Also,
The catalyst carrier may be used by coating it on a honeycomb of cordierite, alumina or the like. A catalytic metal can be supported on the honeycomb to form a catalyst.
【００２０】本第２発明において、タンタルまたはニオ
ブの少なくとも１種を固溶させた酸化チタンからなる担
体に担持する白金族金属としては、白金（Ｐｔ）、パラ
ジウム（Ｐｄ）、ロジウム（Ｒｈ）、またはイリジウム
（Ｉｒ）を用いることができる。これらの白金族金属の
うち、白金、またはパラジウムが炭化水素の低温からの
浄化に対してとくに好ましい。In the second aspect of the present invention, the platinum group metal supported on the carrier made of titanium oxide in which at least one of tantalum and niobium is solid-solved is platinum (Pt), palladium (Pd), rhodium (Rh), Alternatively, iridium (Ir) can be used. Of these platinum group metals, platinum or palladium is particularly preferred for purification of hydrocarbons from low temperatures.
【００２１】これらの白金族金属を前記酸化チタンから
なる担体に担持する方法はとくに限定しない。例えば、
白金を溶解した水溶液を前記担体に含浸させた後、水分
を蒸発させ、その後熱処理により該担体に白金を固定す
る方法により担持させることができる。The method for supporting these platinum group metals on the carrier made of titanium oxide is not particularly limited. For example,
The carrier can be supported by a method of impregnating the carrier with an aqueous solution in which platinum is dissolved, evaporating the water content, and then fixing the platinum on the carrier by heat treatment.
【００２２】また、白金族金属の担持量は、担体１２０
ｇに対し、０．１〜１０ｇが好ましい。０．１未満では
触媒としての活性が見出せない。また、１０ｇを超える
と担持した白金族金属が粗大化し、触媒としての活性が
低下する。The amount of platinum group metal carried is determined by the carrier 120.
0.1 to 10 g is preferable with respect to g. If it is less than 0.1, the activity as a catalyst cannot be found. On the other hand, if the amount exceeds 10 g, the supported platinum group metal will be coarsened and the activity as a catalyst will decrease.
【００２３】（実施例） （本実施例の触媒の調製）市販試薬のルチル型粉末から
なる酸化チタンを準備した。また、通常の市販試薬であ
る酸化タンタル粉末および酸化ニオブ粉末を準備した。
前記ルチル型酸化チタンと該酸化チタン１モルに対し表
１に示す固溶量に相当する所定量の前記酸化タンタルを
計量し、遊星ボールミルを用いて３０分間混合粉砕し、
酸化チタン、酸化タンタルからなる混合物を得た。(Example) (Preparation of catalyst of this example) Titanium oxide made of rutile type powder as a commercially available reagent was prepared. In addition, tantalum oxide powder and niobium oxide powder, which are usual commercial reagents, were prepared.
The rutile type titanium oxide and a predetermined amount of the tantalum oxide corresponding to the solid solution amount shown in Table 1 per 1 mol of the titanium oxide were weighed and mixed and pulverized for 30 minutes using a planetary ball mill,
A mixture of titanium oxide and tantalum oxide was obtained.
【００２４】[0024]
【表１】 [Table 1]
【００２５】次に、得られた混合物を冷間静水圧プレス
により圧粉成形し成形物を得た。得られた成形物を大気
中１４００℃で５時間熱処理し、タンタルを酸化チタン
に固溶させた固溶体を得た。このとき、熱処理温度が１
２００℃未満ではタンタルは酸化チタンに固溶せず、酸
化タンタル、酸化チタンそれぞれの単独酸化物として存
在した。Next, the obtained mixture was compacted by cold isostatic pressing to obtain a molded product. The obtained molded product was heat-treated in the air at 1400 ° C. for 5 hours to obtain a solid solution in which tantalum was dissolved in titanium oxide. At this time, the heat treatment temperature is 1
Below 200 ° C., tantalum did not form a solid solution in titanium oxide and was present as a single oxide of tantalum oxide and titanium oxide.
【００２６】タンタルの酸化チタンへの固溶反応は、１
２００℃以上の温度で起き始め、１４００℃付近で安定
した固溶体ができた。このため、固溶熱処理温度は１４
００℃とした。次に、前記固溶体を乳鉢で粉砕し、粒径
が１００メッシュ以下の粉末にした後、白金（Ｐｔ）を
担持した。白金担持は、粉末状の前記固溶体に白金水溶
液を加え、１２０℃に加熱攪拌しつつ、蒸発乾固させた
後、３５０℃で熱処理して行った。このとき、白金の担
持量は粉末状の固溶体１２０ｇに対し２ｇとした。上記
の操作により、粉末状の本実施例の触媒Ｎｏ．１〜Ｎ
ｏ．６を調製した。The solid solution reaction of tantalum to titanium oxide is 1
It started to occur at a temperature of 200 ° C. or higher, and a stable solid solution was formed at around 1400 ° C. Therefore, the solid solution heat treatment temperature is 14
It was set to 00 ° C. Next, the solid solution was crushed in a mortar to obtain a powder having a particle size of 100 mesh or less, and then platinum (Pt) was loaded on the powder. The platinum loading was performed by adding an aqueous platinum solution to the powdery solid solution, evaporating to dryness while heating and stirring at 120 ° C., and then heat-treating at 350 ° C. At this time, the amount of platinum supported was 2 g per 120 g of the powdery solid solution. By the above operation, the powdery catalyst No. 1 to N
o. 6 was prepared.
【００２７】また、酸化チタンに固溶させる元素をタン
タルからニオブに変えたこと以外は上記工程と同様の操
作により、酸化チタンにニオブを表２に示す所定量固溶
させた担体と、該担体に担持した白金とからなる本実施
例の触媒Ｎｏ．７〜Ｎｏ．１２を調製した。Further, a carrier in which titanium oxide is dissolved in a predetermined amount shown in Table 2 by the same operation as in the above step except that the element to be dissolved in titanium oxide is changed from tantalum to niobium, and the carrier. Catalyst No. of the present example consisting of platinum supported on 7-No. 12 was prepared.
【００２８】[0028]
【表２】 [Table 2]
【００２９】上記触媒Ｎｏ．１〜Ｎｏ．６の調製法と同
様の操作により酸化チタンにタンタルおよびニオブを表
３に示す所定量固溶させた担体と、該担体に担持した白
金とからなる本実施例の触媒Ｎｏ．１３〜Ｎｏ．１８を
調製した。The above catalyst No. 1-No. By the same operation as in the preparation method of Catalyst No. 6, catalyst No. 1 of the present example comprised of a carrier in which tantalum and niobium were solid-dissolved in a predetermined amount shown in Table 3 and platinum supported on the carrier. 13-No. 18 was prepared.
【００３０】[0030]
【表３】 [Table 3]
【００３１】担持させる白金族金属を白金に変えてパラ
ジウム（Ｐｄ）としたこと以外は上記触媒Ｎｏ．１〜Ｎ
ｏ．６の調製法と同様の操作により、酸化チタンにタン
タルを表４に示す所定量担持させた本実施例の触媒Ｎ
ｏ．１９〜Ｎｏ．２４を調製した。The above catalyst No. 1 was changed except that the platinum group metal to be supported was changed to platinum to be palladium (Pd). 1 to N
o. By the same operation as in the preparation method of No. 6, the catalyst N of the present example in which tantalum oxide was loaded with tantalum in a predetermined amount shown in Table 4
o. 19-No. 24 was prepared.
【００３２】[0032]
【表４】 [Table 4]
【００３３】（比較例の触媒の調製）酸化チタンのみか
らなる担体に前記本実施例の触媒の調製法と同様の操作
により白金のみを担持させ、比較例の触媒Ｎｏ．２５を
調製した。(Preparation of Catalyst of Comparative Example) Only platinum was supported on the carrier composed of titanium oxide only by the same operation as in the method of preparing the catalyst of this Example, and the catalyst No. 25 was prepared.
【００３４】また、担体としてアルミナを用い、該担体
１２０ｇに対し白金を２ｇ含浸担持させて比較例の触媒
Ｎｏ．２６を調製した。Alumina was used as a carrier, and 120 g of the carrier was impregnated with 2 g of platinum to carry the catalyst No. 26 was prepared.
【００３５】固溶させるタンタルまたはニオブの量を表
１〜表４に示す値としたこと以外は上記本実施例の触媒
の調製法と同様の操作により比較例の触媒Ｎｏ．２７〜
Ｎｏ．４４を調製した。Catalyst No. of Comparative Example was prepared in the same manner as in the preparation method of the catalyst of this Example except that the amounts of tantalum and niobium to be solid-dissolved were set to the values shown in Tables 1 to 4. 27-
No. 44 was prepared.
【００３６】（性能評価試験）前記本実施例および比較
例の触媒をタブレット状に圧粉成形した後、粒径が６〜
１０メッシュの顆粒に破砕した。破砕した前記各触媒７
ｃｃを固定床流通式反応装置に設置し、炭化水素として
ヘキサン（Ｃ6 Ｈ14）：６００ｐｐｍ、一酸化炭素：１
０００ｐｐｍ、酸素：１０％、窒素バランスガスからな
るモデルガスを各触媒に導入し、入りガス温度を５００
〜１５０℃に変化させてヘキサンの５０％浄化温度を求
めた。結果を表１〜表４に示す。(Performance Evaluation Test) After the powder compaction of the catalysts of the present Example and Comparative Example into a tablet shape, the particle size was 6 to 6
It was crushed into 10 mesh granules. Crushed each catalyst 7
cc was installed in a fixed bed flow reactor, and hexane (C 6 H 14 ) as hydrocarbon: 600 ppm, carbon monoxide: 1
A model gas consisting of 000 ppm, oxygen: 10%, and nitrogen balance gas was introduced into each catalyst, and the incoming gas temperature was set to 500.
The hexane 50% purification temperature was determined by changing the temperature to ˜150 ° C. The results are shown in Tables 1 to 4.
【００３７】表１〜表４に示す結果から、本実施例の触
媒担体を用いた触媒は比較例の触媒に比べて、炭化水素
であるヘキサンを低温から浄化できることがわかる。From the results shown in Tables 1 to 4, it can be seen that the catalyst using the catalyst carrier of this example can purify hydrocarbon hexane at a low temperature as compared with the catalyst of the comparative example.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/94 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B01D 53/94
Claims (2)
を固溶させた酸化チタンからなる排ガス浄化用触媒担体
であって、 前記タンタルまたはニオブの固溶量は、酸化チタンに対
し、０．５〜５モル％であることを特徴とする排ガス浄
化用触媒担体。1. A catalyst carrier for exhaust gas purification, which comprises titanium oxide in which at least one of tantalum and niobium is solid-dissolved, and the solid solution amount of tantalum or niobium is 0.5 to 5 with respect to titanium oxide. A catalyst carrier for purifying exhaust gas, which is characterized by being mol%.
る排ガス浄化用触媒であって、 タンタルまたはニオブの少なくとも１種を、酸化チタン
に対し０．５〜５モル％固溶させた酸化チタンからなる
担体と、 前記担体に担持した白金族金属の少なくとも一種以上
と、からなることを特徴とする排ガス浄化用触媒。2. A catalyst for purifying exhaust gas, which purifies at least hydrocarbons in exhaust gas, comprising titanium oxide in which 0.5 to 5 mol% of tantalum or niobium is solid-dissolved in titanium oxide. An exhaust gas purification catalyst comprising a carrier and at least one or more platinum group metals supported on the carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23421394A JP3436425B2 (en) | 1994-09-02 | 1994-09-02 | Exhaust gas purification catalyst carrier and exhaust gas purification catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23421394A JP3436425B2 (en) | 1994-09-02 | 1994-09-02 | Exhaust gas purification catalyst carrier and exhaust gas purification catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0871418A true JPH0871418A (en) | 1996-03-19 |
| JP3436425B2 JP3436425B2 (en) | 2003-08-11 |
Family
ID=16967474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23421394A Expired - Fee Related JP3436425B2 (en) | 1994-09-02 | 1994-09-02 | Exhaust gas purification catalyst carrier and exhaust gas purification catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3436425B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002219361A (en) * | 2001-01-29 | 2002-08-06 | Toyota Central Res & Dev Lab Inc | Carrier of catalyst for cleaning exhaust gas, its preparing method and catalyst |
| US6524750B1 (en) * | 2000-06-17 | 2003-02-25 | Eveready Battery Company, Inc. | Doped titanium oxide additives |
| US6818347B1 (en) | 2000-06-21 | 2004-11-16 | University Of California | Performance enhancing additives for electrochemical cells |
| US8377607B2 (en) | 2005-06-30 | 2013-02-19 | GM Global Technology Operations LLC | Fuel cell contact element including a TiO2 layer and a conductive layer |
| JP2015211960A (en) * | 2014-04-16 | 2015-11-26 | 新日鐵住金株式会社 | Oxidation catalyst of combustible component in gas to be treated, method for producing oxidation catalyst of combustible component in gas to be treated, oxidation method of combustible component in gas to be treated, and method for removing nitrogen oxide in gas to be treated |
| CN111921534A (en) * | 2020-08-25 | 2020-11-13 | 河南城建学院 | Catalyst for purifying waste gas and preparation method thereof |
-
1994
- 1994-09-02 JP JP23421394A patent/JP3436425B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6524750B1 (en) * | 2000-06-17 | 2003-02-25 | Eveready Battery Company, Inc. | Doped titanium oxide additives |
| US6818347B1 (en) | 2000-06-21 | 2004-11-16 | University Of California | Performance enhancing additives for electrochemical cells |
| JP2002219361A (en) * | 2001-01-29 | 2002-08-06 | Toyota Central Res & Dev Lab Inc | Carrier of catalyst for cleaning exhaust gas, its preparing method and catalyst |
| JP4552098B2 (en) * | 2001-01-29 | 2010-09-29 | 株式会社豊田中央研究所 | Exhaust gas purification catalyst carrier, production method thereof and catalyst |
| US8377607B2 (en) | 2005-06-30 | 2013-02-19 | GM Global Technology Operations LLC | Fuel cell contact element including a TiO2 layer and a conductive layer |
| JP2015211960A (en) * | 2014-04-16 | 2015-11-26 | 新日鐵住金株式会社 | Oxidation catalyst of combustible component in gas to be treated, method for producing oxidation catalyst of combustible component in gas to be treated, oxidation method of combustible component in gas to be treated, and method for removing nitrogen oxide in gas to be treated |
| CN111921534A (en) * | 2020-08-25 | 2020-11-13 | 河南城建学院 | Catalyst for purifying waste gas and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3436425B2 (en) | 2003-08-11 |
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