Effects of identities of supports on Fe-based catalyst and their consequences on activities of CO2 hydrogenation to olefins |
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Authors: | Yangyang LIU Chao SUN Malhi Haripal Singh Chongyang WEI Zhenzhou ZHANG Weifeng TU |
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Affiliation: | 1.Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, Zhengzhou University, Zhengzhou 450001, Henan, China;2.School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China |
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Abstract: | The direct synthesis of olefins by CO2 hydrogenation with iron-based catalysts is one of the best ways to achieve CO2 emission reduction and CO2 conversion and utilization. At present, the CO2 hydrogenation activity and structural strength of the iron-based catalysts are still relatively low during CO2 hydrogenation process, which has become an important challenge for the industrialization of CO2 hydrogenation to olefins. In this work, a series of the supported iron-based catalyst was prepared by the impregnation method to study the influence of the properties of support materials on the structure of iron-based catalysts and the reactivities of the direct synthesis of olefins from CO2 hydrogenation. This work found that the support induced the iron species formed during the process of CO2 hydrogenation, simultaneously affected the order degree of carbon species on the surface of iron-based catalyst, and tuned the capability of CO2 adsorption and the activities of CO2 activation. The results shown that the Fe-based catalyst supported on ZrO2 exhibited the best catalytic performance for CO2 hydrogenation to olefins at 320℃ and 2.0 MPa. The CO2 conversion (>30%) and the selectivity of olefins in C2—C7 hydrocarbon products were as high as over 85%, the ratio of olefins to paraffins was 8.2, and the CO selectivity was 17.1%. |
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Keywords: | carbon dioxide hydrogenation catalyst support olefins iron species alkali metal Na surface carbon species |
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