Manganese Oxides Supported on TiO2鈥揋raphene Nanocomposite Catalysts for Selective Catalytic Reduction of NOX with NH3 at Low Temperature

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• 作者：Xining Lu ; Cunyi Song ; Chein-Chi Chang ; Yunxiao Teng ; Zhensong Tong ; Xiaolong Tang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 23, 2014
• 年：2014
• 卷：53
• 期：29
• 页码：11601-11610
• 全文大小：630K
• ISSN：1520-5045

文摘

TiO₂鈥揼raphene (TiO₂鈥揋E) nanocomposites were prepared by the sol鈥揼el method with different mass ratios of graphene (0鈥?% wt %). With the MnO_X active component loaded by means of ultrasonic impregnation, the catalysts exhibited excellent structure and electrical properties, which favored the catalytic reaction. All the catalysts were characterized by XRD, SEM, TEM, BET, FT-IR, XPS, and Raman spectroscopy. The results indicated that the reduction of graphene oxide and formation of graphene in TiO₂鈥揋E supports and TiO₂鈥揼raphene were readily indexed to anatase TiO₂ in all samples. Various valences of manganese species coexisted in MnO_X/TiO₂鈥揋E catalysts. Especially, nonstoichiometric MnO_X/Mn on the surface of composite catalyst was beneficial to the electron transfer; therefore, the redox performance of the catalyst was improved. The MnO_X/TiO₂鈥?.8%GE catalyst exhibited good resistance to simultaneous H₂O and SO₂, as well as to only H₂O, with an optimum Mn mass ratio of 7 wt %. All the samples showed excellent N₂ selectivity.