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Catalysts 2017, 7(5), 151; doi:10.3390/catal7050151

Effect of Citric Acid on MoO3/Al2O3 Catalysts for Sulfur-Resistant Methanation

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Academic Editors: Benoît Louis, Qiang Wang and Marcelo Maciel Pereira
Received: 6 December 2016 / Revised: 24 April 2017 / Accepted: 26 April 2017 / Published: 12 May 2017
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Abstract

A series of MoO3/Al2O3 catalysts with different amounts (molar ratio of CA/Mo = 0, 1, 1.5, and 2) of citric acid (CA) prepared by simultaneous impregnation were evaluated for sulfur-resistant methanation. Based on the evaluation results, catalytic activity increased accompanied with the rise of citric acid amount. Combine with the analysis of N2-physisorption, XRD, H2-TPR, XPS, and TEM, the catalyst saturated loading capacity improved, resulting in increasing dispersion of Mo species on Al2O3 surface clearly. According to H2-TPR result, the Mo oxide precursors can be more easily sulfureted when citric acid is added. Moreover, based on the Raman analysis, increasingly tetrahedrally coordinated Mo6+ species with high methanation performance are generated after citric acid treatment. These factors probably together accelerate MoO3/Al2O3 catalytic activity growth for methanation. View Full-Text
Keywords: sulfur-resistant methanation; citric acid; dispersion; active Mo oxide precursor sulfur-resistant methanation; citric acid; dispersion; active Mo oxide precursor
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Meng, D.; Wang, B.; Yu, W.; Wang, W.; Li, Z.; Ma, X. Effect of Citric Acid on MoO3/Al2O3 Catalysts for Sulfur-Resistant Methanation. Catalysts 2017, 7, 151.

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