Fischer-tropsch catalyst comprising cobalt, magnesium and precious metal

Patent metadata

Field	Value
Publication number	US-2016222301-A1
Application number	US-201615095277-A
Country	US
Kind code	A1
Filing date	Apr 11, 2016
Priority date	Oct 14, 2011
Publication date	Aug 4, 2016
Grant date	—

Abstract

A method is described for preparing a catalyst precursor suitable for use in the Fischer-Tropsch synthesis of hydrocarbons including 10 to 40% by weight of cobalt oxide crystallites and 0.05 to 0.5% by weight of a precious metal promoter, dispersed over the surface of a porous transition alumina wherein the surface of the transition alumina has been modified by inclusion of 0.25 to 3.5% wt magnesium, including the steps of:
(a) forming a modified catalyst support by impregnating a transition alumina with a magnesium compound, drying and calcining the impregnated alumina in a first calcination at a temperature 600° C. to convert the magnesium compound into oxidic form, and

(b) forming a catalyst precursor by impregnating the modified catalyst support with a cobalt compound and precious metal promoter compound, drying and calcining the impregnated catalyst support in a second calcination to convert the cobalt compound to cobalt oxide.

First claim

1 . A process for Fischer-Tropsch synthesis of hydrocarbons comprising the step of contacting in a Fischer-Tropsch reactor a synthesis gas mixture comprising hydrogen and carbon monoxide with a catalyst prepared by reducing a catalyst precursor comprising 10 to 40% by weight of cobalt oxide crystallites and 0.05 to 0.5% by weight of a precious metal promoter, dispersed over the surface of a modified catalyst support formed from a porous transition alumina the surface of which has been modified by inclusion of 0.25 to 3.5% wt magnesium.

2 . The process according to claim 1 wherein the synthesis gas mixture has a hydrogen:carbon monoxide ratio in the range 1.6:1 to 3.0:1.

3 . The process according to claim 1 wherein the process is operated at a pressure in the range 10 to 60 bar abs and a temperature in the range 210-260° C.

4 . The process according to claim 3 wherein the process is operated at a temperature in the range 230-250° C. at a CO conversion above 40%, with a C5+ hydrocarbon selectivity ≧80% and a methane selectivity ≦15%.

Assignees

• Johnson Matthey Plc

Inventors

• Combes Gary Bevan
• Claridge John Bleddyn
• Gallagher James Robin
• Rosseinsky Matthew J
• Boldrin Paul

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• C10G2/333 Primary

  of the platinum-group · CPC title