TITLE: Investigation of Sulfur-Tolerant Catalysts for Selective Synthesis of Hydrocarbon Liquids from Coal-Derived Gases. Quarterly Technical Progress Report, December 19, 1980-March 18, 1981.

AUTHOR: C. H. Bartholomew.

INST.  AUTHOR: Brigham Young Univ., Provo, UT.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  20 Apr 81,  30p.

ABSTRACT:

During the sixth quarter, a 15 weight % boride-promoted, silica-supported iron catalyst was prepared. Preparations of unsupported cobalt and iron borides were in progress. Characterization of supported iron catalysts by O sub 2 titration and H sub 2 and CO chemisorption showed dispersions to range from 1.6% to 9.3% and percent reductions to range from 12 to 80%.  Reduction was essentially optimum after 36 hours in flowing H sub 2 at 725 K. CO sub 2 chemisorption on potassium-promoted and unpromoted iron catalysts showed surface concentration of the potassium to be markedly greater than bulk concentration. Activity/selectivity measurements were performed on four iron/silica catalysts and one iron boride/silica catalyst. The iron boride/SiO sub 2 catalyst was found to be relatively inactive in comparison to the iron/silica catalysts. Increasing H sub 2  /CO ratio shifted selectivity of iron/silica to lower molecular weight products; the addition of potassium greatly enhanced production of higher molecular weight hydrocarbons at the expense of CH sub 4 production.  Alcohols and CO sub 2 were also detected as products of the reaction. (ERA citation 81:024851)

REPORT  NUMBER: DOE/ET/14809-6

CONTRACT  NUMBER: AC01-79ET14809