Highly efficient Co-Al2O3 catalysts for oxidative dehydrogenation of ethylbenzene to styrene with CO2

被引：0

作者：

Si Z.-W. ^{[1
]}

Dan S.-P. ^{[1
]}

Chen S.-W. ^{[1
]}

Pan D.-H. ^{[1
]}

Wang Y.-X. ^{[1
]}

Yan X.-L. ^{[2
]}

Li R.-F. ^{[2
]}

机构：

[1] College of Chemistry, Taiyuan University of Technology, Taiyuan

[2] College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2023年 / 51卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Co-based catalyst; CO[!sub]2[!/sub; ethylbenzene; oxidative dehydrogenation; styrene;

D O I：

10.19906/j.cnki.JFCT.2023039

中图分类号：

学科分类号：

摘要：

nCo-Al2O3 catalysts with different Co contents (n=2%, 5%, 10%, 15%, 20%) were prepared by a sol-gel approach. The effect of Co content on the nCo-Al2O3 catalyst structure and performance in the oxidative dehydrogenation of ethylbenzene to styrene by CO2 was investigated. The results showed that the isolated Co2 + ions on the nCo-Al2O3 catalysts had a positive influence on the catalytic activity, where the isolated tetrahedral Co2 + species were considered as the active sites. Co contents on the Co-Al2O3 catalyst greatly affected the structure of Co species and the catalytic performance. The isolated tetrahedral Co2 + species are preferentially generated on the resultant nCo-Al2O3 catalyst when the content of Co (n) is less than 10%; as a result, an increase of Co content here leads to the formation of more isolated Co2 + sites and then improves the catalytic activity of nCo-Al2O3 in the dehydrogenation of ethylbenzene. When Co content exceeded 10%, crystalline Co3O4 particles were obtained on the formed catalyst, which resulted in the decline of the isolated Co2 + sites and catalytic activity. Among various nCo-Al2O3 catalysts, 10Co-Al2O3 exhibited the best catalytic performance, with 64.4% conversion rate for ethylbenzene and 99.3% selectivity for styrene at 550 ℃. This catalyst remained stable without obvious deactivation for 30 h of reaction, which suggests that the isolated Co2 + species as active sites presented excellent structural stability and excellent anti-coke deposition. © 2023 Science Press. All rights reserved.

引用

页码：1683 / 1690

页数：7

共 25 条

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