Highly active Fe-Co-Zn/K-Al2O3 catalysts for CO2 hydrogenation to light olefins

被引：50
作者：
Witoon, Thongthai [1 ,2 ]
Chaipraditgul, Nawapat [1 ]
Numpilai, Thanapha [1 ,2 ]
Lapkeatseree, Vittawin [1 ]
Ayodele, Bamidele Victor [4 ]
Cheng, Chin Kui [5 ]
Siri-Nguan, Nuchanart [6 ]
Sornchamni, Thana [6 ]
Limtrakul, Jumras [3 ]
机构：
[1] Kasetsart Univ, Ctr Excellence Petrochem & Mat Technol, Dept Chem Engn, Fac Engn, Bangkok 10900, Thailand
[2] Kasetsart Univ, Res Network NANOTEC KU NanoCatalysts & NanoMat Su, Res Network NANOTEC KU NanoCatalysts & NanoMateri, Bangkok 10900, Thailand
[3] Vidyasirimedhi Inst Sci & Technol, Sch Mol Sci & Engn, Dept Mat Sci & Engn, Rayong 21210, Thailand
[4] Univ Tenaga Nas, Inst Energy Policy & Res, Jalan IKRAM UNITEN, Kajang 43000, Selangor, Malaysia
[5] Khalifa Univ, Coll Engn, Dept Chem Engn, POB 127788, Abu Dhabi, U Arab Emirates
[6] PTT Publ Co Ltd, Innovat Inst, Phra Nakhon Si Ayutthaya 13170, Thailand
来源：
CHEMICAL ENGINEERING SCIENCE | 2021年 / 233卷
关键词：
CO2; hydrogenation; Light olefins; Fe-based catalysts; Promoters; Operating conditions; FE-CO/K-AL2O3; CATALYSTS; DIMETHYL ETHER;
D O I：
10.1016/j.ces.2020.116428
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
CO2 hydrogenation to light olefins over Fe-Co-Zn/K-Al2O3 catalysts with different Zn loading contents (0-1.74 wt%) is studied. The addition of Zn improves the dispersion and the reducibility of iron oxides. The amount of CO adsorbed of the catalysts showed a volcanic trend as a function of Zn content with its maximum of 2.42 mu mol g(-1) at 0.58 wt% Zn, suggesting an increase of number of active sites. The 0.58 wt% Zn-promoted Fe-Co/K-Al2O3 catalyst shows superior activity for light olefins yield (19.9%) under the optimum operating conditions of 340 degrees C, 25 bar, 9,000 mL g(cat)(1)h(-1) and H-2 to CO2 ratio = 4. A gradual decrease in olefin to paraffin ratio with an almost constant CO2 conversion as a function of time-on-stream is observed, which is related to a continuous increase of iron carbide content, indicating that the iron carbide can be acted as the active site for paraffins production. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：9
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