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Production of syngas by CO2 reduction through Reverse Water–Gas Shift (RWGS) over catalytically-active molybdenum-based carbide, nitride and composite nanowires

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  • Dasireddy, Venkata D.B.C.
  • Vengust, Damjan
  • Likozar, Blaž
  • Kovač, Janez
  • Mrzel, Aleš

Abstract

Transition metal carbides and nitrides with large surface areas are attractive for various catalytic reactions. The synthesis of molybdenum carbide, molybdenum nitride and nanocomposite mixed-phase nanowires with the preserved structural morphology of two different precursor reactant materials by heating in diverse gas mixtures is reported herein. Prepared heterogeneous catalysts were characterized using diffraction, physisorption, chemisorption and microscopic techniques. With XRD and interfacial elemental analysis, performed by a transmission electron microscope, the composition of starting intermediate moieties and products was determined. Ordered grain structure appeared almost independent of applied gaseous compounds and typical domain sizes were comparable. The conversions of CO2 during the reverse water–gas shift (RWGS) were calculated for all measured samples in a wide operation range. Composite Mo2C/Mo2N showed the highest conversion higher than the pure Mo2C with similar site amount and especially larger than Mo2N, which demonstrated a low activity throughout the process. The stability of Mo2C/Mo2N wires was tested at 300 °C and they exhibited an unchanged time-on-stream reactivity over a long period of time (>24 h), withstanding deactivation. In addition, the selectivity towards CO was maintained at around 99%. The comparison of catalyst characterisation before and after RWGS reaction show that there is no major difference in the physical and chemical characteristics of the materials further validate the use of the present catalysts.

Suggested Citation

  • Dasireddy, Venkata D.B.C. & Vengust, Damjan & Likozar, Blaž & Kovač, Janez & Mrzel, Aleš, 2021. "Production of syngas by CO2 reduction through Reverse Water–Gas Shift (RWGS) over catalytically-active molybdenum-based carbide, nitride and composite nanowires," Renewable Energy, Elsevier, vol. 176(C), pages 251-261.
    • Handle: RePEc:eee:renene:v:176:y:2021:i:c:p:251-261
    DOI: 10.1016/j.renene.2021.05.051
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    References listed on IDEAS

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    1. Dasireddy, Venkata D.B.C. & Likozar, Blaž, 2019. "The role of copper oxidation state in Cu/ZnO/Al2O3 catalysts in CO2 hydrogenation and methanol productivity," Renewable Energy, Elsevier, vol. 140(C), pages 452-460.
    2. Saadabadi, S. Ali & Thallam Thattai, Aditya & Fan, Liyuan & Lindeboom, Ralph E.F. & Spanjers, Henri & Aravind, P.V., 2019. "Solid Oxide Fuel Cells fuelled with biogas: Potential and constraints," Renewable Energy, Elsevier, vol. 134(C), pages 194-214.
    3. Pata, Ugur Korkut, 2021. "Linking renewable energy, globalization, agriculture, CO2 emissions and ecological footprint in BRIC countries: A sustainability perspective," Renewable Energy, Elsevier, vol. 173(C), pages 197-208.
    4. Mohamed, Ziyaad & Dasireddy, Venkata D.B.C. & Singh, Sooboo & Friedrich, Holger B., 2020. "Comparative studies for CO oxidation and hydrogenation over supported Pt catalysts prepared by different synthesis methods," Renewable Energy, Elsevier, vol. 148(C), pages 1041-1053.
    5. Chiu, Yi-Bin, 2017. "Carbon dioxide, income and energy: Evidence from a non-linear model," Energy Economics, Elsevier, vol. 61(C), pages 279-288.
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    1. Yao, Yunlong & Yu, Zhiquan & Lu, Chenyang & Sun, Fanfei & Wang, Yao & Sun, Zhichao & Liu, Yingya & Wang, Anjie, 2022. "Highly efficient Cu-based catalysts for selective hydrogenation of furfural: A key role of copper carbide," Renewable Energy, Elsevier, vol. 197(C), pages 69-78.

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