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Mixed alcohols synthesis from syngas over Cs- and Ni-modified Cu/CeO2 catalysts
- Source :
-
Fuel . Feb2013, Vol. 104, p62-69. 8p. - Publication Year :
- 2013
-
Abstract
- Abstract: Cu/CeO2 (cop) was prepared by a coprecipitation method using NH3·H2O as a precipitant (in order to avoid the residues of alkali metals), followed by a boiling process to eliminate NH3 and decompose [Cu(NH3)4]2+ complex. Because the Cu particles in Cu/CeO2 (cop) were much smaller than those in Cu/CeO2 (imp) (prepared by an impregnation method), Cu/CeO2 (cop) showed a higher activity than that over Cu/CeO2 (imp) for the synthesis of mixed alcohols. Moreover, Cu/CeO2 (cop) showed a higher CO conversion than that over the industrial catalyst Cu/ZnO due to the reducibility of CeO2-based compounds. Although either Cu/ZnO or Cu/CeO2 (cop) produced methanol as a dominant product, the STY of higher alcohols (C2+OH) formed over Cu/CeO2 (cop) was much larger than that over Cu/ZnO because CeO2-based compounds could catalyze the synthesis of isobutane from syngas (isosynthesis). When Cs was introduced into the Cu/CeO2 (cop) catalyst, the mass ratio of C2+OH to MeOH in the products greatly increased from 0.13 to 0.71 but the CO conversion decreased slightly. Both the CO conversion and the selectivity for higher alcohols over CsCu/CeO2 (cop) were higher than those over CsCu/ZnO. By introducing Ni (an F–T element) into CsCu/CeO2 (cop), the CO conversion increased from 22.2% to 37.6% and the mass ratio of C2+OH to MeOH in the products increased from 0.71 to 0.85. Therefore, CsNiCu/CeO2 (cop) is an excellent catalyst for the synthesis of mixed alcohols. A slow deactivation was observed over CsNiCu/CeO2 (cop) in the reaction at 573K for 18h. The deactivated catalyst could be regenerated by calcination in air at 723K and followed by reduction in H2 at 573K. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 104
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 83931873
- Full Text :
- https://doi.org/10.1016/j.fuel.2010.08.014