摘要:
A catalyst for purifying the exhaust gases of internal combustion engines with improved light-off behavior and improved durability with reduced specific noble-metal content is disclosed which uses active aluminum oxide provided with customary promoters as carrier and platinum and/or palladium and rhodium in customary amounts as noble metals. In addition, it contains one or more base metals in amounts up to 5 times the mass of the total noble metal which are brought into the immediate vicinity of the rhodium by means of a special manufacturing technique.
摘要:
The invention is a three-way catalyst of active aluminum oxide, palladium, rhodium 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,铑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 apparatus for cleaning the exhaust gases of diesel engines, and especially for removal of soot particulates, utilizing series connected filter elements installed in the cross section of a housing traversed by the exhaust gas, wherein at least one filter element carrying a catalyst that lowers the ignition temperature of the soot and assists in soot burn off alternates several times with at least one filter element carrying a catalyst that assists the combustion of gaseous pollutants.
摘要:
A catalyst process is disclosed for the reduction of the ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines by passing the exhaust gas over a catalytically active substance, which is selected from lithium oxide, copper chloride, vanadium oxide/alkali metal oxide combinations, a vanadate of an alkali metal or of cerium, or a silver or alkali metal perrhenate, preferably of sodium or silver, or mixtures of these substances.