1
Zhicheng Hu, Chung Zong Wan, Yiu Kwan Lui, Joseph C Dettling: Layered catalyst composite. Engelhard Corporation, R A Negin, January 28, 1997: US05597771 (131 worldwide citation)

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 ...


2
Chung Zong Wan: Catalyst composition containing segregated platinum and rhodium components. Engelhard Corporation, October 15, 1991: US05057483 (122 worldwide citation)

A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases includes a catalytic material disposed in two discrete coats on a carrier. The first coat includes a stabilized alumina support on which a first platinum catalytic ...


3
Chung Zong Wan, Joseph C Dettling: Aluminum-stabilized ceria catalyst compositions, and methods of making the same. Engelhard Corporation, December 22, 1987: US04714694 (102 worldwide citation)

A catalyst material comprises an aluminum-stabilized ceria which optionally may be combined with an activated alumina and may also comprise one or more platinum group metal catalytic components. A method of making the material includes impregnating bulk ceria or a bulk ceria precursor with an alumin ...


4
Chung Zong Wan, Joseph C Dettling: Catalyst compositions and methods of making the same. Engelhard Corporation, February 23, 1988: US04727052 (70 worldwide citation)

A method of making a catalyst composition comprising an activated alumina coating stabilized against thermal degradation includes applying a coating of alumina having one or more platinum group metal catalytic components dispersed thereon onto a carrier substrate and calcining the coating. The calci ...


5
Chung Zong Wan, Samuel J Tauster, Harold N Rabinowitz: Catalyst composition containing platinum and rhodium components. Engelhard Corporation, October 19, 1993: US05254519 (60 worldwide citation)

A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases includes a catalytic material disposed in on a carrier. The catalytic material contains a co-formed (e.g., co-precipitated) rare earth oxide-zirconia support on whi ...


6
Chung Zong Wan, Joseph C Dettling: High temperature catalyst compositions for internal combustion engine. Engelhard Corporation, November 25, 1986: US04624940 (51 worldwide citation)

Catalysts having three types of particles dispersed on a monolith have surprising oxidation and three-way activity even after exposure to temperatures above 1000.degree. C. The particle types are: (1) palladium dispersed on stabilized alumina; (2) ceria-containing promoter particles and (3) washcoat ...


7
Chung Zong Wan: Catalyst composition containing segregated platinum and rhodium components. July 14, 1992: US05130109 (43 worldwide citation)

A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases, includes a catalytic material disposed in two discrete coats on a carrier. The first coat includes a stabilized alumina support on which a first platinum catalytic ...


8
Chung Zong Wan, Joseph C Dettling, Kenneth I Jagel: Three-way catalyst for lean exhaust systems. Engelhard Corporation, July 7, 1987: US04678770 (38 worldwide citation)

Three-way catalysts containing rhodium, rare earth oxide and platinum and/or palladium of improved durability, when subjected to exhaust gases containing excess oxygen, are formed, when the rhodium is segregated from the rare earth oxide, thereby preventing undesirable interactions between the rhodi ...


9
Chung Zong Wan, Joseph C Dettling: Three-way catalysts of improved efficiency. Engelhard Corporation, April 19, 1988: US04738947 (38 worldwide citation)

A three-way catalyst of improved efficiency suitable for simultaneously oxidizing both gaseous hydrocarbons and carbon monoxide, while reducing nitrogen oxides is disclosed. The three-way catalyst includes alumina, a platinum group metal and a rare earth metal oxide having deposited thereon in intim ...


10
Joseph Hui Zhao Wu, Chung Zong Wan: Catalyst composition containing an intimately mixed oxide of cerium and praseodymium. Engelhard Corporation, August 22, 2000: US06107240 (28 worldwide citation)

A catalyst suitable for the treatment of automotive engine exhaust exhibiting enhanced oxygen storage capacity. The catalyst composition contains, in addition to a catalytic material such as one or more of platinum, rhodium and palladium dispersed on an activated alumina support, an oxygen storage c ...