Catalytic reduction of NO with decomposed methanol on alumina-supported Mn-Ce catalysts

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• 作者：I. Spassova^a ; ^{ispasova@svr.igic.bas.bg} ; T. Tsontcheva^b ; N. Velichkova^a ; M. Khristova^a ; D. Nihtianova^a ; ^c
• 关键词：Manganese&ndash ; ceria supported on alumina catalysts ; SCR of NOx with CO ; Methanol decomposition
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 May, 2012
• 卷：374
• 期：1
• 页码：267-277
• 文件大小：1132 K

摘要

A series of manganese-ceria supported on alumina catalysts with various Mn/Ce ratios are investigated in both methanol decomposition to CO and hydrogen and SCR of NO_x with CO. The study is aimed at the potential application of both reactions in integrated devices, where NO_x is reduced with the products of the decomposed methanol. The samples are characterized by nitrogen physisorption, XRD, TEM, XPS, UV-Vis, and TPR. It was established that manganese-ceria supported on alumina catalysts are perspective in both methanol decomposition and NO reduction at temperatures above 723 K, which are typical for exhausted gases from the vehicles and some stationary stations. The best catalytic activity and selectivity to the desired products under these conditions was found for the samples with Mn/Mn + Ce ratio of 0.5 and 0.7. This superior catalytic performance is related to the formation of mixed valence Mn³⁺/Ce⁴⁺ and Mn⁴⁺/Ce³⁺ active sites.