Citation: LI Shi-ya, LÜ Shuai, ZHANG Yu-hua, LI Jin-lin, LIU Zhong-neng, WANG Li. Syngas-derived olefins over iron-based catalysts: Effects of basic properties of MgO nanocrystals[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(11): 1342-1351. shu

Syngas-derived olefins over iron-based catalysts: Effects of basic properties of MgO nanocrystals

LI Shi-ya ¹ ,
LÜ Shuai ¹ ,
ZHANG Yu-hua ¹ ,
LI Jin-lin ^1,, ,
LIU Zhong-neng ² ,
WANG Li ^1,,

1.
Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China
2.
Sinopec Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China

Corresponding author: LI Jin-lin, jinlinli@aliyun.com WANG Li, li.wang@mail.scuec.edu.cn
Received Date: 22 June 2018
Revised Date: 18 September 2018

Fund Project: The project was supported by the Key Program Project of the NSFC and China Petrochemical Corporation Joint Fund (U1463210), and the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities (CZW15099, CZP17028 and CZP17065)the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities CZP17028the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities CZP17065the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities CZW15099the Key Program Project of the NSFC and China Petrochemical Corporation Joint Fund U1463210

Figures(9)

A series of Fe/MgO catalysts with well-defined exposed crystal planes were synthesized by impregnation, deposition-precipitation and ultrasonic impregnation methods. The catalysts were characterized by X-ray powder diffraction, high-resolution transmission electron microscopy, CO₂ temperature-programmed desorption, H₂ temperature-programmed reduction, X-ray spectroscopy and N₂ adsorption-desorption isotherms. The characterization results indicate that the basicity of MgO supports strongly affect the catalytic performance of iron-based catalysts for Fischer-Tropsch synthesis. It is found that the strong basicity sites of MgO supports remain during the ultrasonic impregnation process. The intrinsic basicity of Fe/MgO catalysts enhances dissociative CO adsorption and promotes the olefin selectivity. In addition, the catalyst of iron particles on the (111) crystal planes of MgO nanosheets presents higher TOF value and olefins selectivity than that of the catalyst using the (100) crystal planes of MgO nanocubes as a support. The effect of basic properties of MgO nanocrystals facilitates CO chemisorption, suppressing H₂ adsorption and olefin desorption on the corresponding Fe/MgO catalysts.
- Fischer-Tropsch synthesis,
- iron,
- MgO,
- preparation method
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