TITLE: Metal-Support Interactions: Their Effects Upon Adsorption Electronic, and Activity/Selectivity Properties of Cobalt in CO Hydrogenation. Annual Progress Report, May 1, 1981-April 30, 1982.

AUTHOR:  C. H. Bartholomew;   R. Reuel;   J. M. Zowtiak.

INST.  AUTHOR:  Brigham Young Univ., Provo, UT. Dept. of Chemical Engineering.

SPONSOR:  Department of Energy, Washington, DC.

LANGUAGE:  English

PUB.  TYPE:  Technical Report

PUB.  COUNTRY:  United States

SOURCE:  Department of Energy [DE],  30 Apr 82,  56p.

NTIS ORDER NO.:  DE82014669/INW

ABSTRACT: 

 The investigation of cobalt metal-support interactions and their effects upon adsorption and activity/selectivity properties of cobalt is described. The objectives of this research are to (i) determine the effects of cobalt-support interactions on dispersion, oxidation state and adsorption properties of cobalt; (ii) correlate the activity/selectivity properties for hydrocarbon synthesis on cobalt with dispersion, oxidation state and behavior of adsorption of CO and H sub 2 and (iii) measure directly the extent of interaction of various supports with iron and cobalt using Moessbauer Spectroscopy. The proposed work features a comprehensive, quantitative experimental investigation of Co on Al sub 2 O sub 3 , SiO sub 2 , TiO sub 2, MgO, and carbon supports with careful characterization of the physical and chemical, bulk and surface properties of each catalysts with BET, H sub 2 and CO chemisorption XRD, TEM, ESCA, TPD, and TPR measurements. During the first year of investigation H sub 2 and CO adsorption uptakes and activity/selectivity data were obtained for Co supported on alumina, silica, magnesia, titania and carbon. The results provide evidence that supports and preparation methods can significantly influence adsorption and activity/selectivity properties. For example, Co/TiO sub 2 is significantly more active and more selective for C/sub 8+/ hydrocarbons than Co/Al sub 2 O sub 3 and Co/SiO sub 2 ; Co/carbon produces significantly higher fractions of CO sub 2 and C sub 2 -C sub 3 hydrocarbons than cobalt on Al sub 2 O sub 3 , SiO sub 2 or TiO sub 2 .

REPORT  NUMBER:  DOE/ER/10855-1

CONTRACT  NUMBER:  AC02-81ER10855