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Non-oxidative conversion of methane into higher hydrocarbons over Mo/MCM-22 catalyst

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Abstract

Molybdenum impregnated zeolite catalyst has been well-known for methane conversion into higher hydrocarbons under non-oxidative condition. HZSM-5 & HMCM-22 zeolites are the effective supports for this purpose. However, the catalytic performance of HMCM-22 supported molybdenum catalyst is considered suitable than that for HZSM-5 catalyst with high aromatic selectivity due to unique pore structure and framework of MCM-22 zeolite support. Effect of Mo loading over MCM-22 zeolite has been studied for the activity test and observed that 5 wt% metal content over the support (MCM-22) is optimum for the proper tuning of acidic & metallic sites of the catalyst. Effect of silica/alumina ratio (SAR, molar) of MCM-22 zeolite has also been studied and observed that lower SAR (30) is suitable (\(\hbox {C}_{6}\hbox {H}_{6}\) selectivity, 37%) comparatively to higher SAR (55) (\(\hbox {C}_{6}\hbox {H}_{6}\) selectivity, 18%). Lower GHSV (720 mL/g.h) is effective for higher hydrocarbon production compared to higher GHSV (1200 mL/g.h) due to low residence time. Mo/MCM-22 catalysts with different Mo loading were characterized by BET surface area, XRD, Raman spectroscopy and \(\hbox {NH}_{3}\)-TPD analysis. Unique pore systems [10 & 12 membered ring (MR)] and framework of MCM-22 zeolite support are the key factors for effective methane conversion to value added chemicals when loaded with molybdenum.

Graphical Abstract

Mo/MCM-22 bifunctional catalyst was studied in detail for direct methane conversion into higher hydrocarbons under non-oxidative condition. The effect of Mo loading and silica/alumina ratio of support was studied for the process. The results suggest that 5 wt% Mo loading and lower SAR (30) is effective for higher hydrocarbon formation.

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Acknowledgements

Authors are thankful to Gas Authority of India Limited (GAIL, India) for providing financial support for completing this research.

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Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology, Delhi, 110 016, India

    Sourabh Mishra, Sonit Balyan, Kamal K Pant & M Ali Haider

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  1. Sourabh Mishra
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  2. Sonit Balyan
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  3. Kamal K Pant
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  4. M Ali Haider
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Correspondence to Kamal K Pant.

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Special Issue on Recent Trends in the Design and Development of Catalysts and their Applications

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Mishra, S., Balyan, S., Pant, K.K. et al. Non-oxidative conversion of methane into higher hydrocarbons over Mo/MCM-22 catalyst. J Chem Sci 129, 1705–1711 (2017). https://doi.org/10.1007/s12039-017-1374-3

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  • DOI: https://doi.org/10.1007/s12039-017-1374-3

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