Effects of Na on Structure of Fe-Zn Catalysts and Their Consequences for Olefins Formation during CO2 Hydrogenation

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Effects of Na on Structure of Fe-Zn Catalysts and Their Consequences for Olefins Formation during CO2 Hydrogenation

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[1]SUN Chao,ZHANG Zhenzhou,CHEN Baojian,et al.Effects of Na on Structure of Fe-Zn Catalysts and Their Consequences for Olefins Formation during CO2 Hydrogenation[J].Journal of Zhengzhou University (Engineering Science),2022,43(04):97-103.[doi:10.13705/j.issn.1671-6833.2022.01.009]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 04 Page number: 97-103 Column: Public date: 2022-07-03

Title:: Effects of Na on Structure of Fe-Zn Catalysts and Their Consequences for Olefins Formation during CO2 Hydrogenation

Author(s):: SUN Chao; ZHANG Zhenzhou; CHEN Baojian; DU Chunli; TU Weifeng; School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

Keywords:: carbon dioxide; olefins; alkali metal; iron species; hydrogenation

CLC:: TQ426；TQ221. 2

DOI:: 10.13705/j.issn.1671-6833.2022.01.009

Abstract:: Formation of olefins directly from CO2 hydrogenation is one of the effective and valuable routs for utilization.Formation of high value-added products directly from CO2-H2 mixtures may occur via a combination of reverse water-gas-shift (RWGS) reaction and Fisher-Tropsch (FT) synthesis over Fe based catalysts.This route produces by-products,which leads to a complex reaction system and low olefins selectivity.In this stu-dy,a series of Fe-Zn catalysts with Na were synthesized to get a deep insight into the effects of Na on the catalytic hydrogenation of CO2 and the structures of Fe-Zn catalyst at working state,by steady-state rate measurements,In-situ X-ray diffraction (In-situ XRD),In-situ X-ray photoelectron spectroscopy (In-situ XPS),In-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRIFTS).Decorating with Na facilitated the formation of Fe5C2.Electron transfer occured between Na and Fe5C2,resulting in the increase of electron density of Fe sites,which was not conducive to the secondary hydrogenation of olefin and improved the ratio of olefin to alkane.Decorating with Na facilitated C-C coupling by regulating the proportion of surface CH* species.The results showed that the Na exhibited the best catalytic performance for CO2 hydrogenation to olefins at 593 K and 1.5 MPa.the selectivity of olefins in hydrocarbons was as high as 65%,the O/P ratio was up to 6,and the CO selectivity was below 18%.

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Last Update: 2022-07-03