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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
Authors to whom correspondence should be addressed.
Academic Editors: Benoît Louis, Qiang Wang and Marcelo Maciel Pereira
Catalysts 2017, 7(5), 151;
Received: 6 December 2016 / Revised: 24 April 2017 / Accepted: 26 April 2017 / Published: 12 May 2017
PDF [6567 KB, uploaded 12 May 2017]


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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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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