A novel approach to highly dispersing catalytic materials in coal for gasification. Final technical report, September 1989--November 1992
The objectives of this project were to investigate the effects of coal surface charge on the uptake of aqueous soluble metal catalysts from solution and to determine the influence of the interfacial interaction on char reactivity. Another goal is to assess the potential of using potassium carbonate, potassium acetate or their mixtures as catalysts for char gasification. The lower cost and the high catalytic activity of the latter compound will produce economic benefits by reducing the amount of potassium carbonate required for efficient char reactivities on a commercial scale. To minimize the interference of the coals` inherent inorganic materials with the added calcium or potassium, the gasification studies were restricted to the demineralized coals. In a manner similar to the effect of pH on the surface electrochemistry of the coals, the reactivities of the calcium- or potassium-loaded chars in bon dioxide at 800{degree}C were dependent upon the pH at which the catalysts were ion-exchanged onto the coals. For the calcium-containing chars, the reactivities increased in the order: pH 6 > pH 10 > pH 1. In contrast, the variation of the gasification rates with potassium loading pH was: pH 6 {approximately} pH 10 {much_gt} pH 1. However, simultaneous adsorption of the metals at {approximately} pH 1 enhanced char reactivity relative to metals loading at pH 6 or 10. These findings are attributed to the differences in the extent of electrostatic interaction between the calcium or potassium ions and the charged coal surface during catalyst loading from solution.
- Research Organization:
- Clark Atlanta Univ., GA (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-89PC89760
- OSTI ID:
- 10177336
- Report Number(s):
- DOE/PC/89760-T12; ON: DE93040557
- Resource Relation:
- Other Information: PBD: Dec 1992
- Country of Publication:
- United States
- Language:
- English
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