催化作用
铜
吸附
选择性催化还原
氧化还原
无机化学
化学
X射线光电子能谱
氧气
硫黄
拉曼光谱
摩尔比
化学工程
有机化学
工程类
物理
光学
作者
Lulu Li,Lei Zhang,Kaili Ma,Weixin Zou,Yuan Cao,Yan Xiong,Changjin Tang
标识
DOI:10.1016/j.apcatb.2017.02.041
摘要
A series of ultra-low content copper-modified TiO2/CeO2 catalysts were prepared by wet impregnation method and tested for selective catalytic reduction of NO by NH3. The catalyst with a Cu/Ce molar ratio of 0.005 showed the best low-temperature activity and excellent sulfur-poisoning resistance. It was worth noting that the very small amounts of copper addition can lead to three times the activity at low temperature. The prepared catalysts were characterized by XRD, BET, Raman, XPS, NH3-TPD and the results revealed that the introduction of copper increased the amount of surface adsorbed oxygen and Ce3+ species on the catalyst surface and generated more Brønsted acid sites. The redox and surface acidic properties were also improved by the addition of Cu. All these factors played important roles in enhancing NH3-SCR performance of TiO2-CuO/CeO2 catalysts. Furthermore, in situ DRIFT experiments demonstrated that Cu doping enhanced the adsorption capacity of NH3 while the appearance of CuO weakened the adsorption ability of bridging nitrates, both the two factors synergistically facilitated the NH3-SCR reaction proceed smoothly via the Eley-Rideal pathway.
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