| Autor: |
Mu, Jiali, Shi, Junjun, France, Liam John, Wu, Yongshan, Zeng, Qiang, Liu, Baoan, Jiang, Lilong, Long, Jinxing, Li, Xuehui |
| Zdroj: |
ACS Applied Materials & Interfaces; June 2018, Vol. 10 Issue: 27 p23112-23121, 10p |
| Abstrakt: |
Direct dehydrogenation of isobutane to isobutene has drawn extensive attention for synthesizing various chemicals. The Mo-based catalysts hold promise as an alternative to the toxic CrOx- and scarce Pt-based catalysts. However, the low activity and rapid deactivation of the Mo-based catalysts greatly hinder their practical applications. Herein, we demonstrate a feasible approach toward the development of efficient and non-noble metal dehydrogenation catalysts based on Mo–CThybrid nanowires calcined at different temperatures. In particular, the optimal Mo–C700catalyst exhibits isobutane consumption rate of 3.9 mmol g–1h–1and isobutene selectivity of 73% with production rate of 2.8 mmol g–1h–1. The catalyst maintained 90% of its initial activity after 50 h of reaction. Extensive characterizations reveal that such prominent performance is well correlated with the adsorption abilities of isobutane and isobutene and the formation of η-MoC species. In contrast, the generation of β-Mo2C crystalline phase during long-term reaction causes minor decline in activity. Compared to MoO2and β-Mo2C, η-MoC plays a role more likely in suppressing the cracking reaction. This work demonstrates a feasible approach toward the development of efficient and non-noble metal dehydrogenation catalysts. |
| Databáze: |
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