Carbon dioxide gasification of carbon black: Isotope study of carbonate catalysis
Temperature-programmed reaction was used with labeled isotopes ( 13C and 18O) to study interactions between carbon black and potassium carbonate in pure He and 10% CO 2/90% He atmospheres. Catalytic gasification precursor complexes were observed. Carbon and oxygen-bearing carbon surface groups inter...
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Published in | Journal of catalysis Vol. 90; no. 1; pp. 65 - 74 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier Inc
01.01.1984
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Temperature-programmed reaction was used with labeled isotopes (
13C and
18O) to study interactions between carbon black and potassium carbonate in pure He and 10% CO
2/90% He atmospheres. Catalytic gasification precursor complexes were observed. Carbon and oxygen-bearing carbon surface groups interacted with the carbonate above 500 K to form surface complexes. Between 500 and 950 K, and in the presence of gaseous CO
2, the complexes participated in C and O exchange with the gas phase while oxygen atoms within the complexes also exchanged wtih those on the carbon surface. As the temperature rose, the complexes decomposed, with CO
2 the initial product. Decomposition started around 500 K in pure He, and around 950 K in
CO
2
He
. Catalytic gasification began only after decomposition of significant portions of the complexes. Elemental potassium formed, and the active catalyst appears to alternate between being potassium metal and a potassium-oxygen-carbon complex. Potassium carbonate is not part of the catalytic cycle. |
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ISSN: | 0021-9517 1090-2694 |
DOI: | 10.1016/0021-9517(84)90085-X |