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Title: | Synthesis, characterization and catalytic activity in the hydrogenation of cyclohexene with molybdenum carbide |
Authors: | Espinoza-Monjardin Cruz-Reyes, J Del Valle-Granados, M Flores-Aquino, E Avalos-Borja, M Fuentes-Moyado, S |
Issue Date: | 2008 |
Abstract: | Two series of molybdenum carbides are prepared from MoO3 by temperature programmed reduction (TPR), differing in feed gas composition (20 and 40% CH4/H-2). The heating ramp consists of two steps, one from ambient temperature to 973 K, at a rate of 10 K/min the second from 973 K up to the final temperature (1023, 1073, 1123, 1173 K), at a rate of 0.5 K/min. The Mo2C (hcp) phase is identified for the series prepared with 20% CH4/H-2 at different temperatures, with surface areas between 20 and 27 m(2)/g. Also found is a mix of the MoC and Mo2C (hcp) phases for the series prepared with 40% CH4/H-2 at temperatures above 1023 K, with surface areas between 9 and 19 m(2)/g. Both series of catalysts reach 100% conversion of cyclohexene in 5 h or less, with those catalysts prepared with a 40% CH4/H-2 gas mix reaching maximum conversion in the least time. Catalysts are compared to a commercial molybdenum carbide reagent as a reference. |
URI: | http://hdl.handle.net/11154/1032 |
ISSN: | 1011-372X |
Appears in Collections: | Ciencias
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