Fundamental Approach to Characterization and Processing of Coal-Derived-Liquid (CDL). Fourth Quarterly Report, June-August 1985

摘要

Loss of catalytic activity during hydroprocessing of coal derived liquid continues to be an important technical problem requiring research attention. We have postulated that competitive adsorption plays a significant role in reduced catalytic activity. In the third quarterly report, we have reported a technique to determine the enthalpy and entropy of adsorption on a catalyst surface. Also, some above mentioned parameters for simple aromatic substrates were reported. This report covers the analysis of normal paraffins in a mixture and in two groups of mixtures. The current work with paraffins is being conducted to ascertain factors influencing adsorption such as catalyst surface changes, gas composition, and sulfiding effects. The heat of adsorption and entropy of adsorption for normal paraffins (n-C sub 5 H sub 12 to nC sub 16 H sub 34 ) are summarized in Table 1 and are shown to decrease with an increase in molecular weight and with heat of vaporization, which indicates a favorable adsorption on catalyst surface. A computer program was developed to fit these experimental data. 1 ref., 6 figs., 1 tab. (ERA citation 12:006433)