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1. WO1995035152 - LAYERED CATALYST COMPOSITE

Publication Number WO/1995/035152
Publication Date 28.12.1995
International Application No. PCT/US1995/001849
International Filing Date 14.02.1995
Chapter 2 Demand Filed 17.11.1995
IPC
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
53
Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34
Chemical or biological purification of waste gases
92
of engine exhaust gases
94
by catalytic processes
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/113
38
of noble metals
54
combined with metals, oxides or hydroxides provided for in groups B01J23/02-B01J23/36118
56
Platinum group metals
63
with rare earths or actinides
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
37
Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
02
Impregnation, coating or precipitation
B01D 53/94 (2006.01)
B01J 23/63 (2006.01)
B01J 37/02 (2006.01)
CPC
B01D 2255/902
B01D 53/945
B01J 23/63
B01J 37/0244
Y02T 10/22
Applicants
  • ENGELHARD CORPORATION [US/US]; 101 Wood Avenue Iselin, NJ 08830, US
Inventors
  • CHEN, Shau-Lin; US
  • RABINOWITZ, Harold, N.; US
  • TAUSTER, Samuel, J.; US
Agents
  • MILLER, Stephan, I. ; Engelhard Corporation 101 Wood Avenue Iselin, NJ 08830, US
Priority Data
08/261,62417.06.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LAYERED CATALYST COMPOSITE
(FR) CATALYSEUR COMPOSITE EN COUCHES
Abstract
(EN)
The present invention relates to a layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The structure of the layered catalyst composite of the present invention is designed wherein there is a first layer and a second layer. The first layer comprises a first support; at least one first palladium component, optionally a minor amount of a platinum, optionally a first oxygen storage composition, optionally a zirconium component; optionally at least one first alkaline earth metal components and optionally at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components. The second layer comprises a second support; a second platinum component; a rhodium component; a second oxygen storage composition comprising a diluted second oxygen storage component and optionally a zirconium component.
(FR)
La présente invention se rapporte à un catalyseur composite en couches, appelé généralement catalyseur à conversion à trois voies, qui a la capacité de catalyser pratiquement simultanément l'oxydation d'hydrocarbures et du monoxyde de carbone et la réduction des oxydes d'azote. La structure du matériau composite en couches catalyseur de la présente invention se caractérise en ce qu'elle comporte une première couche et une seconde couche. La première couche comprend un premier support; au moins un premier composant de palladium, éventuellement une quantité infime de platine, éventuellement une première composition renfermant de l'oxygène, éventuellement un composant de zirconium; éventuellement au moins un premier composant de métaux alcalino-terreux et éventuellement au moins un premier composant de métaux des terres rares sélectionné dans le groupe constitué par des composants métalliques de lanthane et des composants métalliques de néodyme. La seconde couche comprend un second support; un second composant de platine; un composant de rhodium; une seconde composition renfermant de l'oxygène comprenant un second composant dilué renfermant de l'oxygène et éventuellement un composant de zirconium.
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