Research on Isobutane Dehydrogenation over Mo/MgAl2O4 Catalysts and Pilot-Scale Evaluation in a Circulating Fluidized-Bed Unit
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- 作者：Guowei Wang ; Chunyi Li ; Honghong Shan ; Wenlong Wu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：September 18, 2013
- 年：2013
- 卷：52
- 期：37
- 页码：13297-13304
- 全文大小：398K
- 年卷期：v.52,no.37(September 18, 2013)
- ISSN：1520-5045
文摘
In this article, an environmentally friendly non-noble-metal class of Mo/MgAl2O4 catalysts is demonstrated to exhibit excellent performance in isobutane dehydrogenation. Results of activity tests indicated that an induction period is required for the catalysts to develop the active species. Further investigation revealed that high-valence-state Mo species are favorable for the initial oxidative reactions and Mo4+ ions are probably the actual active species for catalytic dehydrogenation. Given the strongly endothermic characteristics and rapid catalyst deactivation of alkane dehydrogenation, a circulating fluidized-bed unit was further applied to evaluate the activity and stability of the catalysts. To avoid undesired oxidative reactions and improve the initial catalytic activity, a flow of hydrogen was introduced into the pilot-scale unit to prereduce the catalysts prior to reaction. In general, the catalysts exhibited highly active and stable performance in the pilot-scale evaluation, with an isobutene yield of up to 35 wt %, demonstrating great potential for industrial applications.