论文部分内容阅读
利用KIT-6的有序介孔作为限域空间制备了一系列的介孔Cu O-Ce O2催化剂.借助XRD、BET、Raman、ESEM、TEM和H2-TPR等手段对催化剂进行表征,并考察其在HCl氧化反应中的催化性能.结果表明:铜含量<35%时,Cu O物种高度分散在催化剂的表面或者进入Ce O2晶格,催化剂具有高比表面积(>140 m2·g-1)和较小的晶粒尺寸,其中25Cu O-Ce O2催化剂具备最高的表面氧空位浓度和最优的低温氧化还原性能,并在HCl氧化反应中表现出最佳的催化活性,O2/HCl=6,370℃时转化率达到90%.反应动力学结果表明,25Cu O-Ce O2中更多的高分散的Cu O促进了HCl在催化剂表面的吸附和活化,更高浓度的氧空位增强了氧分子的吸附和活化.
A series of mesoporous Cu O-Ce O2 catalysts were prepared by using ordered mesoporous KIT-6 as the confined space. The catalysts were characterized by means of XRD, BET, Raman, ESEM, TEM and H2-TPR And its catalytic performance in the oxidation of HCl.The results show that the CuO species are highly dispersed on the surface of the catalyst or enter the lattice of Ce O2 when the copper content is less than 35%, and the catalyst has high specific surface area (> 140 m2 · g-1) And 25Cu O-Ce O2 catalyst exhibited the highest surface oxygen vacancy concentration and the best low temperature redox performance, and exhibited the best catalytic activity in the HCl oxidation reaction, with O2 / HCl = 6,370 ℃, the conversion rate reached 90% .The reaction kinetics results showed that the more highly dispersed CuO in 25Cu O-Ce O2 promoted the adsorption and activation of HCl on the catalyst surface, and the higher concentration of oxygen vacancies enhanced the Adsorption and activation.