TITLE: Technology development for cobalt F-T catalysts. Quarterly technical progress report No. 11, April 1, 1995--June 30, 1995.

AUTHOR: A. H. Singleton.

INST.  AUTHOR: Energy International, Inc., Pittsburgh, PA.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  25 Oct 95,  177p.

NTIS ORDER NO.: DE96007532INW

ABSTRACT:

Preliminary results on the effect of reaction temperature on the performance of Co catalysts during F-T synthesis obtained during the last quarter confirmed that Co catalysts were very sensitive to temperature and deactivated significantly at temperatures above 240(degrees)C both in the fixed bed and the slurry bubble column reactors. Following this preliminary investigation, a series of tests were carried out during this period in order to elucidate the nature of this deactivation process as well as determine possible means of preventing it. In order to elucidate the nature of this deactivation process, the catalysts which had undergone significant deactivation after high temperature (280(degrees)C) reaction in either the fixed bed reactor or the slurry bubble column reactor were regenerated and retested in the fixed bed reactor. In both cases the catalysts recovered completely their initial activity. In addition, reactions at very high H(sub 2)/CO ratios and high temperatures showed very little deactivation, suggesting that the deactivation of the Co catalysts during F-T synthesis at high temperatures was mainly due carbon formation via the Boudouard reaction. Due to the unreactive nature of this carbon, it could only be removed by calcination.

REPORT  NUMBER: DOE/PC/92108-T11

CONTRACT  NUMBER: AC22-92PC92108