TITLE: Chemistry and Catalysis of Coal Liquefaction: Catalytic and Thermal Upgrading of Coal-Liquid and Hydrogenation of CO to Produce Fuels.  Quarterly Progress Report, January-March 1983.

AUTHOR: W. H. Wiser.

INST.  AUTHOR: Utah Univ., Salt Lake City. Dept. of Mining and Fuels Engineering.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Apr 83,  94p.

ABSTRACT:

Stereochemical studies of naphthalene hydrogenation over several sulfided CoMo, NiMo and NiW catalysts have revealed unusually high trans/cis ratios in the decalin products. This result is quite different from the low ratios reported for hydrogenation over metal catalysts, and indicates a different site geometry for sulfided catalysts. The active site may consist of a cavity into which the molecule adsorbs, the hydrogen atoms being added from opposite sites, in contrast to the flat adsorption proposed for metal sites. It has been previously shown that at room temperature restrictive diffusion can significantly lower the effectiveness factor of a catalyst when the molecular size of the diffusion molecule is an appreciable fraction of the pore size of the catalyst. New results show that this restrictive diffusion effect decreases with increasing temperature, but may still be important under hydroprocessing conditions. (ERA citation 08:038340)

REPORT  NUMBER: DOE/ET/14700-14

CONTRACT  NUMBER: AC22-79ET14700