公开(公告)号：US4552733A

公开(公告)日：1985-11-12

申请号：US682978

申请日：1984-12-18

申请人： Charles E. Thompson ,  John J. Mooney ,  Carl D. Keith ,  William A. Mannion

发明人： Charles E. Thompson ,  John J. Mooney ,  Carl D. Keith ,  William A. Mannion

IPC分类号： B01D53/94 ,  B01J23/56 ,  B01J23/89 ,  B01J37/02 ,  B01D53/00 ,  B01J8/02

CPC分类号： B01D53/945 ,  B01J23/56 ,  B01J23/89 ,  B01J37/0238 ,  Y02T10/22

摘要： This invention provides polyfunctional catalysts comprising a composite of platinum and one or more of rhodium, ruthenium and iridium, a substantially larger quantity of one or more base metal oxides in which the metal is selected from the group consisting of metals having an atomic number from 25 to 28 and rhenium, and an alumina support, which composite is made and then deposited on a suitable carrier. In a preferred embodiment, the catalysts contain 1-20 weight percent of said base metal oxide, typically nickel oxide; 0.05-0.5 weight percent platinum; and 0.002-0.3 weight percent rhodium, and an alumina support deposited on a monolith or other carrier. The improved catalysts are especially applicable for purifying exhaust gases from combustion processes, and in particular those from internal combustion engines.These polyfunctional catalysts have in a single formulation, the ability to accomplish four objectives--to oxidize carbon monoxide and unburned hydrocarbons while reducing nitrogen oxides, thereby converting those contaminants found in the exhaust of internal combustion engines into carbon dioxide, water and elemental nitrogen, but without producing significant amounts of hydrogen sulfide, sulfur trioxide or sulfuric acid. Such chemical conversions take place over the catalyst when the ratio of air to fuel supplied to the catalyst is controlled to nearly stoichiometric conditions, thereby maintaining the exhaust feed gases within a narrow compositional range, sometimes called a "window", in which the catalyst can substantially convert the contaminants.

摘要翻译： 本发明提供了包含铂和铑，钌和铱中的一种或多种的复合物的多官能催化剂，其中大量的一种或多种贱金属氧化物，其中金属选自原子序数为25的金属 至28和铼，以及氧化铝载体，该复合材料制成然后沉积在合适的载体上。 在优选的实施方案中，催化剂含有1-20重量％的所述贱金属氧化物，通常为氧化镍; 0.05-0.5重量百分比的铂; 和0.002-0.3重量％的铑，以及沉积在整料或其它载体上的氧化铝载体。 改进的催化剂特别适用于净化来自燃烧过程的废气，特别是来自内燃机的废气。 这些多官能催化剂在单一配方中具有实现四个目标的能力 - 在减少氮氧化物的同时氧化一氧化碳和未燃烧的烃，从而将内燃机排气中发现的污染物转化为二氧化碳，水和元素氮，但是 而不产生显着量的硫化氢，三氧化硫或硫酸。 当提供给催化剂的空气与燃料的比例被控制到接近化学计量条件时，这种化学转化发生在催化剂上，从而将排气进料气体保持在窄的组成范围内，有时被称为“窗口”，其中催化剂可以 基本上转化污染物。

公开(公告)号：US4157316A

公开(公告)日：1979-06-05

申请号：US833922

申请日：1977-09-16

申请人： Charles E. Thompson ,  John J. Mooney ,  Carl D. Keith ,  William A. Mannion

发明人： Charles E. Thompson ,  John J. Mooney ,  Carl D. Keith ,  William A. Mannion

IPC分类号： B01D53/94 ,  B01J23/56 ,  B01J23/60 ,  B01J23/64 ,  B01J23/652 ,  B01J23/656 ,  B01J23/89 ,  B01J37/02 ,  B01J21/04 ,  B01J23/10 ,  B01J23/74

CPC分类号： B01D53/945 ,  B01J23/56 ,  B01J23/89 ,  B01J37/0238 ,  Y02T10/22

摘要： This invention provides polyfunctional catalysts comprising a composite of platinum and one or more of rhodium, ruthenium and iridium, a substantially larger quantity of one or more base metal oxides in which the metal is selected from the group consisting of metals having an atomic number from 25 to 28 and rhenium, and an alumina support, which composite is made and then deposited on a suitable carrier. In a preferred embodiment, the catalysts contain 1-20 weight percent of said base metal oxide, typically nickel oxide; 0.05-0.5 weight percent platinum; and 0.002-0.3 weight percent rhodium, and an alumina support deposited on a monolith or other carrier. The improved catalysts are especially applicable for purifying exhaust gases from combustion processes, and in particular those from internal combustion engines.These polyfunctional catalysts have in a single formulation, the ability to accomplish four objectives - to oxidize carbon monoxide and unburned hydrocarbons while reducing nitrogen oxides, thereby converting those contaminants found in the exhaust of internal combustion engines into carbon dioxide, water and elemental nitrogen, but without producing significant amounts of hydrogen sulfide, sulfur trioxide or sulfuric acid. Such chemical conversions take place over the catalyst when the ratio of air to fuel supplied to the catalyst is controlled to nearly stoichiometric conditions, thereby maintaining the exhaust feed gases within a narrow compositional range, sometimes called a "window," in which the catalyst can substantially convert the contaminants.

摘要翻译： 本发明提供了包含铂和铑，钌和铱中的一种或多种的复合物的多官能催化剂，其中大量的一种或多种贱金属氧化物，其中金属选自原子序数为25的金属 至28和铼，以及氧化铝载体，该复合材料制成然后沉积在合适的载体上。 在优选的实施方案中，催化剂含有1-20重量％的所述贱金属氧化物，通常为氧化镍; 0.05-0.5重量百分比的铂; 和0.002-0.3重量％的铑，以及沉积在整料或其它载体上的氧化铝载体。 改进的催化剂特别适用于净化来自燃烧过程的废气，特别是来自内燃机的废气。