TITLE: Deactivation by carbon of iron catalysts for indirect liquefaction.  Final technical progress report for the period September 16, 1986-September 15, 1990.

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],  14 Feb 91,  56p.

NTIS ORDER NO.: DE91011276INW

ABSTRACT:

Progress is reported for a four-year fundamental investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for FT synthesis, the objectives of which were to (1) determine rates and mechanisms of carbon deactivation of unsupported Fe and Fe/K catalysts during CO hydrogenation and (2) model the global rates of deactivation at the surface of the catalyst for the same catalysts. A computer-automated reactor system to be used in the kinetic and deactivation studies was designed, constructed and tested. Kinetic data for CO hydrogenation on unsupported, unpromoted iron, 99% Fe/1% Al(sub 2)O(sub 3), and K-promoted 99% Fe/1% Al(sub 2)O(sub 3) catalysts were obtained as functions of temperature, reactant particle pressures and time. The activity/selectivity and kinetic data are consistent with those previously reported for supported, unpromoted and promoted iron. Two kinds of deactivation were observed during FT synthesis on these samples: (1) loss of surface area after reduction of unsupported, unpromoted iron at 400(degree)C and (2) loss of activity with time due to carbon deposition, especially in the case of K-promoted 99% Fe/1% A1(sub 2)O(sub 3).  Deactivation rate data were obtained for CO hydrogenation on promoted Fe as a function of time, temperature, and H(sub 2)/CO ratio. 50 refs., 24 figs., 5 tabs.

REPORT  NUMBER: DOE/PC/90533-16

CONTRACT  NUMBER: FG22-86PC90533