Promotional mechanism of propane on selective catalytic reduction of NOx by methane over In/H-BEA at low temperature
Promotional mechanism of propane on selective catalytic reduction of NOx by methane over In/H-BEA at low temperature
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丙烷低温下In/H-BEA对甲烷选择性催化还原NOx的促进机制
DOI：
10.1016/j.apsusc.2016.08.156
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发表时间：
2016-12-30
影响因子：
6.7
通讯作者：
He, Cheng
中科院分区：
文献类型：
--
作者：
Pan, Hua;Jian, Yanfei;He, Cheng
在250至550℃的温度范围内研究了丙烷/甲烷比例对甲烷和丙烷混合物在In/H-BEA催化剂上还原NOX的影响。在450℃以上的高温下，In/H-BEA对CH4-SCR表现出较高的催化活性，而在425℃以下的C3H8-SCR中实现了较高的NOX转化率。甲烷和丙烷作为共还原剂。与In/H-BEA催化剂相比，丙烷/甲烷为1/2的混合物显示出最优异的T-50（325℃）和T-90（500℃）温度用于NOX还原。对于丙烷低温甲烷还原NO的促进机制来说，低温下布朗斯台德酸位上C3H8的活化增强了碳质物种（如R-COOH）的形成，并进一步促进了-NCO物种的生成，这是NO还原的关键决定步骤。 (C) 2016 Elsevier B.V. 保留所有权利。
Effects of propane/methane ratios on NOX reduction by mixtures of methane and propane over In/H-BEA catalyst were investigated at temperatures ranging from 250 to 550 degrees C. The higher catalytic activity of In/H-BEA was exhibited for CH4-SCR at high temperatures above 450 degrees C, while the higher NOX conversion was achieved in C3H8-SCR at below 425 degrees C. A broadened temperature window and enhanced CO2 selectivity were achieved by combining of methane and propane as the co-reductant. The mixtures with propane/methane of 1/2 showed the most superior T-50 (325 degrees C) and T-90 (500 degrees C) temperatures for NOX reduction over In/H-BEA catalyst. For the promotion mechanism of propane on NO reduction by methane at low temperature, the formation of carbonaceous species (e.g. R-COOH) were enhanced by the activation of C3H8 on Bronsted acid sites at low temperature, and further promoted the generation of -NCO species, which was a crucial determining step for NO reduction. (C) 2016 Elsevier B.V. All rights reserved.