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

SI Zhi-wei; DAN Shao-peng; CHEN Shu-wei; PAN Da-hai; WANG Ying-xiong; YAN Xiao-liang; LI Rui-feng

doi:10.19906/j.cnki.JFCT.2023039

Volume 51 Issue 11

Nov. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(11): 1683-1690

SI Zhi-wei, DAN Shao-peng, CHEN Shu-wei, PAN Da-hai, WANG Ying-xiong, YAN Xiao-liang, LI Rui-feng. Highly efficient Co-Al2O3 catalysts for oxidative dehydrogenation of ethylbenzene to styrene with CO2[J]. Journal of Fuel Chemistry and Technology, 2023, 51(11): 1683-1690. doi: 10.19906/j.cnki.JFCT.2023039

Citation:

SI Zhi-wei, DAN Shao-peng, CHEN Shu-wei, PAN Da-hai, WANG Ying-xiong, YAN Xiao-liang, LI Rui-feng. Highly efficient Co-Al₂O₃ catalysts for oxidative dehydrogenation of ethylbenzene to styrene with CO₂[J]. Journal of Fuel Chemistry and Technology, 2023, 51(11): 1683-1690. doi: 10.19906/j.cnki.JFCT.2023039

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

doi: 10.19906/j.cnki.JFCT.2023039

SI Zhi-wei^{1, #
,},
DAN Shao-peng^{1, #
,},
CHEN Shu-wei^{1
,
,},
PAN Da-hai^1
,,
WANG Ying-xiong^1
,,
YAN Xiao-liang^2
,,
LI Rui-feng^2
,

1.
College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, China
2.
College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China

Funds: The project was supported by the National Natural Science Foundation of China (22378286, 21975174) and Funds for Central Government to Guide Local Science and Technology Development (YDZJSX2021A014).

Received Date: 2023-03-08
Accepted Date: 2023-05-04
Rev Recd Date: 2023-05-04

Available Online: 2023-05-06

Publish Date: 2023-11-13

Abstract

Abstract

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 Co^{2 +} ions on the nCo-Al₂O₃ catalysts had a positive influence on the catalytic activity, where the isolated tetrahedral Co^{2 +} 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 Co^{2 +} 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 Co^{2 +} 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 Co^{2 +} 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 Co^{2 +} species as active sites presented excellent structural stability and excellent anti-coke deposition.
- Co-based catalyst,
- ethylbenzene,
- oxidative dehydrogenation,
- CO₂,
- styrene

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References(25)

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