摘要:
A monolithic or honeycomb-catalyst, in particular for purifying the exhaust gases of internal-combustion engines, composed of an inert ceramic or metallic support traversed by parallel flow channels, a layer disposed thereon and composed of catalysis-promoting metal oxide and a catalytically active component supported by the metal oxide, wherein the concentration of the catalysis-promoting metal oxide increases from the periphery to the central axis of the support. Alternatively, the catalysis-promoting metal oxide is essentially equally distributed between central axis and periphery of the support, but concentration of catalytically active component increases from the central axis to the periphery of the support.
摘要:
A catalyst support for detoxifying the exhaust gases of alcohol fueled internal combustion engines contains, besides rare earth metal oxides and palladium, molybdenum silicide on active aluminum oxide in order to improve the conversion of noxious substances and the start up behavior.
摘要:
A coating dispersion is shown for the production of catalysis-promoting coatings on an inert, structure-reinforcing element. The solids of the dispersion are present in various particle fractions and lead to a relatively rough coating surface with improved exchange between the exhaust gas and the catalyst surface. This results in improved heat-up behavior of the catalyst.
摘要:
A coating dispersion is shown for the production of catalysis-promoting coatings on an inert, structure-reinforcing element. The solids of the dispersion are present in various particle fractions and lead to a relatively rough coating surface with improved exchange between the exhaust gas and the catalyst surface. This results in improved heat-up behavior of the catalyst.
摘要:
A catalyst for purifying the exhaust gases of internal combustion engines by means of oxidation and reduction with a reduced tendency to store sulfur oxides and to emit H.sub.2 S contains active Al.sub.2 O.sub.3 as carrier which is charged with CeO.sub.2 and optionally with ZrO.sub.2 as well as with platinum, and/or palladium, and optionally rhodium and also contains in addition 0.7 to 20% by weight B.sub.2 O.sub.3 relative to Al.sub.2 O.sub.3.
摘要翻译:通过氧化和还原的方式来净化内燃机废气的催化剂具有降低的存储硫氧化物的倾向并且排出H 2 S的催化剂,其含有作为载体的活性Al 2 O 3作为载体,其中CeO 2和任选地含有ZrO 2以及铂,并且 /或钯,和任选的铑,并且还相对于Al 2 O 3还含有0.7至20重量%的B 2 O 3。
摘要:
An oxidizing and/or reducing exhaust gas purification catalyst with a reduced tendency to emit H.sub.2 S contains active Al.sub.2 O.sub.3 as carrier which is charged with CeO.sub.2 and optionally ZrO.sub.2 as well as Pt, Pd and/or Rh and, in addition, 0.1 to 40% by weight ZnO relative to Al.sub.2 O.sub.3.
摘要翻译:具有降低排放H 2 S的趋势的氧化和/或还原废气净化催化剂含有作为载体的活性Al 2 O 3作为载体,其被加入CeO 2和任选的ZrO 2以及Pt,Pd和/或Rh,另外还含有0.1至40% 重量ZnO相对于Al2O3。
摘要:
A process is described for the purification of exhaust gases containing oxides of nitrogen and sulfur obtained from combustion installations and industrial production processes by selective catalytic reduction of the nitric oxides with ammonia, subsequent catalytic oxidation of sulfur dioxide with oxygen and conversion into sulfuric acid of the sulfur trioxide obtained.
摘要:
An open-cell, monolithic catalyst for the purification of diesel-engine exhaust gas with a coating of finely divided inorganic oxides containing vanadium and platinum group metal as active components. The active components of the oxidic coating are added as water-soluble precursors which are then converted by means of tempering, preferably in an atmosphere of hydrogen, into the active component.
摘要:
The invention is a three-way catalyst of active aluminum oxide, palladium, platinum and cerium dioxide. If Al.sub.2 O.sub.3 is present as bulk carrier, the catalyst contains 5-20% by weight CeO.sub.2 and if Al.sub.2 O.sub.3 is present as a coating on a honeycombed, inert carrier, it contains 25-50% by weight CeO.sub.2.
摘要翻译:本发明是活性氧化铝,钯,铂和二氧化铈的三元催化剂。 如果Al2O3作为散装载体存在,则催化剂含有5-20%(重量)CeO 2,如果Al 2 O 3以蜂窝状惰性载体作为涂层存在,则其含有25-50%(重量)CeO 2。
摘要:
An open-cell, monolithic catalyst for the purification of diesel-engine exhaust gas with a coating of finely divided inorganic oxides containing vanadium and platinum group metal as active components. The active components of the oxidic coating are added as water-soluble precursors which are then converted by means of tempering, preferably in an atmosphere of hydrogen, into the active component.