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- W1564080259 abstract "EXAFS spectroscopy and several supplementary techniques have been used to investigate a variety of coal and polymer chars containing alkali and alkaline earth catalysts. The catalysts studied included Ca, K, Rb, and Sr. In-situ EXAFS measurements were performed on Rb-loaded polymer chars during gasification. At 450 deg. C in 90% N sub 2 - 10% O sub 2, the Rb XANES exhibited a doublet structure similar to that of Rb/sub 2/CO/sub 3/. EXAFS and other techniques show that the Ca in lignites, both naturally occurring and ion-exchanged, is essentially molecular dispersed and bonded to carboxyl groups. It is found that features similar to those exhibited by calcite (CaCO/sub 3/) are induced in both the near-edge structure and radial structure functions of chars with increasing pyrolysis time and temperature. The EXAFS spectra of K-loaded polymer, lignite, and bituminous coals are found to differ significantly from each other." @default.
- W1564080259 created "2016-06-24" @default.
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- W1564080259 date "1986-02-01" @default.
- W1564080259 modified "2023-09-27" @default.
- W1564080259 title "X-ray-absorption spectroscopic study of the reactions, dispersion, and degradation of the Ca and K catalytic species in coal gasification. Annual report, January-December 1985" @default.
- W1564080259 hasPublicationYear "1986" @default.
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