TITLE: Cation Promotion Effects in Zeolite-Supported F-T Catalysts. First Quarterly Report, September-November 1983.

AUTHOR: J. G. Goodwin;   A. Sayari.

INST.  AUTHOR: Pittsburgh Univ., PA. Dept. of Chemical and Petroleum Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Dec 83,  7p.

ABSTRACT:

An investigation into zeolite-supported F-T catalysts has produced results which suggest that alkali cations, remaining in a zeolite and serving to neutralize the structure, act to promote higher hydrocarbon formation. It appears that the F-T metal must be highly dispersed throughout the zeolite in the vicinity of these cations for this promotion effect to take place. This effect is also highly dependent upon alkali cation concentration. The current research involves a study of the promotion effects of the neutralizing alkali cations on CO hydrogenation (under typical F-T conditions) over zeolite-supported Ru catalysts. Ru is a useful, model catalyst for the study of such promotion of this synthesis. First, alkali promotion has been found to have a great effect on product selectivity over Ru. Second, Ru does not form any stable carbides, thereby removing this complicating factor. Third, Ru is relatively easy to reduce to the metallic state. Fourth, Ru is the F-T metal easiest to keep inside zeolite crystallites. Fifth, under typical conditions, there is little oxygenated hydrocarbon formation or skeletal isomerization of the hydrocarbons over Ru. Thus, the neutralizing cations in the zeolite support should affect CO hydrogenation over Ru possibly by affecting: CO chemisorption, H sub 2 chemisorption, carbon deposition, catalytic activity, chain growth probability, selectivity for CH sub 4, selectivity for olefins, and diffusion in the zeolite. Preliminary results are reported. (ERA citation 09:009538)

REPORT  NUMBER: DOE/PC/60805-T1

CONTRACT  NUMBER: FG22-83PC60805