The role of catalyst precursor anions in coal gasification. Tenth quarterly report
This project investigates the roles of various aqueous soluble catalyst precursors containing various anions, specifically acetate (CH{sub 3}COO{sup {minus}}), chloride (Cl{sup {minus}}), nitrate (NO{sub 3}{sup {minus}}), sulfate (SO{sub 4}{sup 2{minus}}) and carbonate (CO{sub 3}{sup 2{minus}}) on the surface electrical properties of coal and seeks to understand the effects of these salts on the adsorption, dispersion and activities of calcium and potassium. The current report discusses the reactivities the lignite derived char catalyzed by {approximately}0.05 - 0.07 %wt. potassium. The catalytic compounds used were potassium acetate, potassium carbonate, potassium chloride, potassium nitrate, and potassium sulfate. The initial concentration of each salt solution from which potassium was ion-exchanged onto the coal was 0.001 mol/L and the metal was ion-exchanged onto the coal at the approximate pHs of 2, 6 and 9. Although the potassium contents in the chars were similar ({approximately}0.05 - 0.07 %wt.), a wide spread of char reactivities were observed. Char gasification ranged from > 90 %wt. to < 20 %wt. At this time, no general correlation between char reactivities, catalyst type, catalyst precursor anions or catalyst loading pH is obvious. However, the data are currently being analyzed in terms of zeta potentials to determine the effect, if any, of the coal surface properties on catalyst dispersion and gasification rate.
- Research Organization:
- Clark Atlanta Univ., GA (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91286
- OSTI ID:
- 10162734
- Report Number(s):
- DOE/PC/91286-T9; ON: DE94014544; TRN: 94:006996
- Resource Relation:
- Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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