The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2009
Filed:
Dec. 22, 2005
Jacobus Lucas Visagie, Sasolburg, ZA;
Hans Marcel Veltman, Utrecht, NL;
Jacobus Lucas Visagie, Sasolburg, ZA;
Hans Marcel Veltman, Utrecht, NL;
Sasol Technology (Proprietary Limited), Johannesburg, ZA;
Engelhard De Meern B.V., The Meern, NL;
Abstract
A process for producing a supported Fischer-Tropsch catalyst includes treating, in an activation stage (), a particulate pre-reduction cobalt nitrate-based supported Fischer-Tropsch synthesis catalyst precursor containing reducible cobalt oxides, with hydrogen as a reducing gas in order to reduce the cobalt oxides over a period of time to Co, with ammonia and water being formed, the reduction including a time period when predominantly CoO is reduced to Co. Unreacted hydrogen is withdrawn (), which thus includes water and treated to lower its dewpoint (). At least a portion of the withdrawn unreacted hydrogen is returned to the activation stage () as recycle hydrogen (). An ammonia concentration is maintained in the activation stage (), at least during the time when predominantly CoO is reduced to Co, of less than 250 volume parts per million ('vppm').