WαMn1 – ο/sub>Ox Catalysts Synthesized by a One-Step Urea Co-precipitation Method for Selective Catalytic Reduction of NOx with NH3 at Low Temperatures

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• 作者：Wenbo Sun ; Xinyong Li ; Qidong Zhao ; Moses Tade ; Shaomin Liu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：30
• 期：3
• 页码：1810-1814
• 全文大小：333K
• ISSN：1520-5029

文摘

Selective catalytic reduction (SCR) of NO_x with NH₃ (NH₃-SCR) at low temperatures is a promising technology for DeNO_x (removal of NO_x) as a result of its high NO_x conversion, excellent selectivity, and broad application prospect. As a result of the remarkable activity under low temperature for SCR performance, Mn-based catalysts have attracted extensive attention. In this work, a series of W_αMn_1 – αO_x (α = 0, 0.25, 0.33, 0.5, or 1) catalysts were synthesized by a one-step urea co-precipitation method and characterized by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Thereamong, the W_0.33Mn_0.66O_x catalyst showed the highest NH₃-SCR activity within a broad temperature range of 230–470 °C. In addition, the active Mn and W species were in highly amorphous or poorly crystalline states. It was revealed that the interaction of W and Mn increased the chemistry oxygen content of the catalysts, thus enhancing the low-temperature SCR performance.