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Effect of phosphorus on acidity and catalytic performance of Al-MCM-41 for the selective conversion of ethyl mercaptan to ethylene and H2S

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Abstract

A series of phosphorus modified Al-MCM-41 molecular sieves with various P/Al ratios were prepared via impregnating method and tested in the selective transformation of ethyl mercaptan into ethylene and hydrogen sulfide. The resulting samples were characterized by a combination of X-ray diffraction, N2 adsorption, ICP-OES, NH3 -TPD, 27Al and 31P MAS NMR spectroscopy. The experimental findings demonstrated that P modification can effectively increase the concentration as well as the strength of weak acid sites. Intermediate acid sites were gradually decreased with phosphorus addition, and the product distribution was found to vary with the acidity of the zeolites. Phosphorus content has strong influence on catalytic stability and ethylene selectivity. Upon P treatment, the amount of coke drastically decreased and the catalyst lifetime prolonged. The notable results could be useful for developing a viable process for removing ethyl mercaptan from natural gas.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China

    Xiong-fei Zhang, Fei Liu & Xiaoxia Yang

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  1. Xiong-fei Zhang
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  2. Fei Liu
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  3. Xiaoxia Yang
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Correspondence to Xiaoxia Yang.

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Zhang, Xf., Liu, F. & Yang, X. Effect of phosphorus on acidity and catalytic performance of Al-MCM-41 for the selective conversion of ethyl mercaptan to ethylene and H2S. J Porous Mater 23, 1255–1260 (2016). https://doi.org/10.1007/s10934-016-0184-1

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  • DOI: https://doi.org/10.1007/s10934-016-0184-1

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