摘要:
In an exhaust gas disposable catalyst which is a .gamma.-alumina catalyst prepared by sol-gel process, .gamma.-alumina has more than 300 m.sup.2 /g specific surface area and the catalyst element is supported on the .gamma.-alumina and dispersed in pores thereof. The exhaust gas disposable catalyst is obtained by adding the catalyst element as a solution of salt before gelating in sol-gel process.
摘要:
A ceramic sliding member is formed of sintered silicon nitride material which contains Si.sub.3 N.sub.4 as the major component and further contains Y, Mg and Ce, the Y content being 2 to 20% by weight in terms of Y.sub.2 O.sub.3, the Mg content being 0.1 to 0.9% by weight in terms of MgO, and the Ce content being 1 to 10% by weight in terms of CeO.sub.2.
摘要翻译:陶瓷滑动构件由含有Si 3 N 4作为主要成分并且还含有Y,Mg和Ce,Y含量以Y 2 O 2计为2〜20重量%,Mg含量为0.1〜0.9重量%的烧结氮化硅材料形成, 以Ce计,Ce含量为1〜10重量%。
摘要:
A catalyst layer formed on the walls of exhaust gas channels in a particulate filter contains a catalyst material in the form of secondary particles, each secondary particle being formed so that at least two kinds of primary particles selected from the group consisting of primary particles of activated alumina, primary particles of a Zr-based mixed oxide and primary particles of a Ce-based mixed oxide are mixed and cohere together. Each of the primary particles of the Zr-based mixed oxide contains Zr and a rare earth metal Z other than Ce and each of the primary particles of the Ce-based mixed oxide contains Ce, Zr and a rare earth metal R other than Ce.
摘要:
Walls forming exhaust gas channels in a DPF are coated with a catalyst layer for promoting the burning of particulates trapped thereon. The catalyst layer contains alumna and a composite oxide containing Ce as a major component and rare earth metal other than Ce or alkali earth metal. Pt is loaded on the alumina and the composite oxide.
摘要:
Disclosed is an exhaust gas purifying catalyst, which comprises an oxygen absorbing material having a catalytic noble metal arranged at a lattice position or an interlattice position of a crystal structure of a composite oxide containing Ce and Zr, which is capable of sufficiently exhibiting a catalytic function even if a ZrO2 mass ratio is out of the range of 20 to 30 mass % or 65 to 90 mass %. Specifically, in an exhaust gas purifying catalyst formed with a catalyst layer including a cerium-zirconium (CeZr) composite oxide, the composite oxide contains ceria (CeO2) and zirconia (ZrO2) in such a manner that a mass ratio of ceria to a total mass of ceria and zirconia falls within the range of 36 to 64 mass %. Further, the composite oxide contains, in the form of an oxide, a rare-earth metal other than cerium (Ce), in the range of 3 to 20 mass % with respect to a total mass of the composite oxide.
摘要:
In an exhaust gas purification catalyst in which a catalytic coating containing plural kinds of aluminas and plural kinds of oxygen storage components each carrying a catalytic precious metal is coated on a honeycomb support, the catalytic coating is formed of an upper layer and a lower layer, palladium is carried on a first alumina and a Ce—Zr—La—Y-alumina compound having oxygen storage capacity in the lower layer, platinum is carried on a second alumina in the upper layer, and rhodium is carried on a third alumina and a Ce—Zr—Nd mixed oxide having oxygen storage capacity in the upper layer.
摘要:
There are provided NOx trap catalyst to trap and release NOx based on air-fuel ratio, first fuel supply means for supplying gasoline, second fuel supply means for supplying hydrogen, engine operation detecting means for detecting engine operating condition, fuel ratio changing means for changing the ratio of gasoline and hydrogen, NOx release determining means for determining whether it is required for the NOx to be released based on a state of the trapped NOx, NOx releasing means for releasing the NOx trapped by making the air-fuel ratio rich when the NOx releasing requirement is determined, gasoline ratio increasing means for increasing the ratio of gasoline when NOx releasing requirement is determined and the air-fuel-ratio rich control is executed. Accordingly, improper vibrations or noises can be restrained from occurring when the rich air-fuel-ratio control is executed to release the trapped NOx from the NOx trap catalyst.
摘要:
The present invention provides a catalyst for purifying an exhaust gas having excellent heat resistance and a small level of deterioration of the purifying ability of the exhaust gas even if the catalyst is exposed to a high temperature atmosphere for a long time. The catalyst for purifying an exhaust gas comprises a catalytic metal for oxidizing HC and CO and reducing NOx for purification, and a mixed oxide containing Ce, Zr and Sr.
摘要:
A catalytic base material for an exhaust gas purifying catalyst is produced by impregnating ceria powders with a barium contained solution and heating the ceria particles at approximately 400 to 1100° C. to create and accumulate barium oxides fixed to surfaces of the ceria particles.
摘要:
The active temperature of an exhaust gas cleaning catalyst is shifted to a higher temperature side when Al.sub.2 O.sub.3 and/or CeO.sub.2 is used as a co-catalyst and/or when an oxidation number of Pt or Ir which is used as the noble active component is plus four.
摘要翻译:当使用Al 2 O 3和/或CeO 2作为助催化剂时和/或当用作贵金属活性组分的Pt或Ir的氧化数为正时,排气净化催化剂的活性温度转移到较高温度侧 四。