期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 58, 期 47, 页码 21372-21381出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b04286
关键词
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资金
- National Natural Science Foundation of China [21376146, 21636006]
- Fundamental Research Funds for the Central Universities [GK201901001]
- Foundation for the Excellent Doctoral Dissertation of Shaanxi Normal University [X2013YB03]
The ordered mesoporous V2O5 (9 wt %)-Ce1-xZrxO2 (7 wt %)-Al2O3 (VCA-x, x = 0, 0.5, and 1) was successfully synthesized by combining the hydrothermal and the modified evaporation-induced self-assembly methods. The mixed oxides were evaluated as a catalyst for the oxidative dehydrogenation of ethylbenzene with CO2 (CO2-ODEB) under industrial relevant conditions, and VCA-0.5 showed the best performance during the 50 h test. Although the coke deposition could really cover the active site, block the pore channel, and decrease the specific surface area of the catalyst, the loss of the active V with a high oxidation state was rigorously revealed as the critical cause of the catalyst deactivation. Moreover, the best performance of VCA-0.5 was well explained as the efficient stabilization of V by the redox cycle of Ce3+/Ce4+. This finding is beneficial to promote the advancement of an active and stable V2O5-based catalyst for CO2-ODEB.
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