Fundamental studies of the mechanism of catalytic reactions with catalysts effective in the gasification of carbon solids and the oxidative coupling of methane. Quarterly report, April 1, 1993--June 30, 1993
The last quarterly report (LBL-33769) summarized results obtained with ternary catalysts; e.g., K-Ca-Ni oxide and K-Ca-Co oxide. It was also shown that chars prepared in e presence of NAOH were more easily gasified than the base char, even if the chars were washed to remove all residual free NAOH. During the present report quarter, three variables were investigated: (1) The effect of varying the atomic ratio of different catalyst components (alkali vs. transition metal); (2) The effect of steam partial pressure and of temperature on the reaction; (3) Determination of activation energy of the reaction over K-Ca-Co oxide. It was also found that if the water (steam) used for gasification contains a small amount of NAOH, gasification rates are greatly improved. Figure 1 shows that the gasification rate improves with increasing Co content of the catalyst, though the differences between different Co contents are relatively small. A very similar effect was observed for different concentrations of Fe{sup 3+} in KCa-Fe oxide catalysts. Figure 2 presents conversion vs. time plots for gasification of an Ill {number_sign}6 char (which had been charred in the presence of 0.5% caustic) over a K-Ca-Co oxide catalyst at four temperatures. As expected the gasification rate increases with temperature, although there is little difference between our standard 640{degree}C and 680{degree}C. Figure 3 investigates the effect of partial pressure of water on the conversion using an Ill {number_sign}6 char (prepared in the presence of 0.5% caustic) and a K-Ca-Co oxide catalyst at 640{degree}C. There is an improvement in rate with increasing water partial pressure.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10176357
- Report Number(s):
- LBL--34250; ON: DE93019103
- Country of Publication:
- United States
- Language:
- English
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