Michael J Bradford

US Patent:

6504074, Jan 7, 2003

Filed:

Dec 3, 1998

Appl. No.:

09/204576

Inventors:

Johannes P. Verduijn - late of Oostvoorne, NL
Gary David Mohr - League City TX
Kenneth Ray Clem - Humble TX
Wilfried Jozef Mortier - Kessel-lo, BE
Machteld Maria Mertens - Boortmeerbeek, BE
Michael C. Bradford - Waltham MA

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 552

US Classification:

585475, 502 67

Abstract:

There is provided a coated zeolite catalyst in which the accessibility of the acid sites on the external surfaces of the zeolite is controlled and a process for converting hydrocarbons utilizing the coated zeolite catalyst. The zeolite catalyst comprises core crystals of a first zeolite and a discontinuous layer of smaller size second crystals of a second zeolite which cover at least a portion of the external surface of the first crystals The coated zeolite catalyst finds particular application in hydrocarbon conversion processes where catalyst activity in combination with zeolite structure are important for reaction selectivity, e. g. , catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.

US Patent:

6812181, Nov 2, 2004

Filed:

Dec 4, 2002

Appl. No.:

10/309453

Inventors:

Jannetje Maatje van der Berge - Oostvoorne, NL
Gary David Mohr - League City TX
Kenneth Ray Clem - Humble TX
Wilfried Jozef Mortier - Kessel-lo, BE
Machteld Maria Mertens - Boortmeerbeek, BE
Michael C. Bradford - Waltham MA

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

B01J 2906

US Classification:

502 67, 502 61, 502 64, 502 78, 502 69

Abstract:

There is provided a coated zeolite catalyst in which the accessibility of the acid sites on the external surfaces of the zeolite is controlled and a process for converting hydrocarbons utilizing the coated zeolite catalyst. The zeolite catalyst comprises core crystals of a first zeolite and a discontinuous layer of smaller size second crystals of a second zeolite which cover at least a portion of the external surface of the first crystals The coated zeolite catalyst finds particular application in hydrocarbon conversion processes where catalyst activity in combination with zeolite structure are important for reaction selectivity, e. g. , catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.

US Patent:

7335295, Feb 26, 2008

Filed:

Jun 7, 2004

Appl. No.:

10/862849

Inventors:

Jannetje Maatje van den Berge - Oostvoorne, NL
Gary David Mohr - League City TX, US
Kenneth Ray Clem - Humble TX, US
Wilfried Jozef Mortier - Kessel-lo, BE
Machteld Maria Mertens - Boortmeerbeek, BE
Michael C. Bradford - Waltham MA, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C10G 35/04

US Classification:

208134, 208 89, 208108, 585407, 585477, 585446

Abstract:

There is provided a coated zeolite catalyst in which the accessibility of the acid sites on the external surfaces of the zeolite is controlled and a process for converting hydrocarbons utilizing the coated zeolite catalyst. The zeolite catalyst comprises core crystals of a first zeolite and a discontinuous layer of smaller size second crystals of a second zeolite which cover at least a portion of the external surface of the first crystals The coated zeolite catalyst finds particular application in hydrocarbon conversion processes where catalyst activity in combination with zeolite structure are important for reaction selectivity, e. g. , catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.