CuxCo(1-x)/Al2O3/堇青石整体式催化剂的制备及其催化甲苯燃烧性能(英文)  

Preparation of Cu_xCo_(1-x)/Al_2O_3/Cordierite Monolithic Catalysts and the Catalytic Combustion of Toluene

作　　者：赵福真[1,2] 张广宏[3] 曾鹏辉[1] 杨肖[1] 季生福[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,100029 [2]中南民族大学化学与材料科学学院催化材料科学湖北省暨国家民委-教育部共建重点实验室,湖北武汉430074 [3]宁夏师范学院化工系,宁夏固原756000

出　　处：《催化学报》2011年第5期821-826,共6页

基　　金：国家自然科学基金(20473009)~~

摘　　要：以堇青石蜂窝陶瓷为基底,Al2O3浆料为过渡胶体,Cu和Co为催化活性组分,制备了一系列CuxCo1x/Al2O3/堇青石（x=0-1）整体式催化剂.采用X射线衍射、X射线光电子能谱、扫描电镜和程序升温还原等手段对催化剂进行了表征.以甲苯为模型化合物,在微型固定床反应器上评价了催化剂的催化性能.结果表明,当Cu含量较低时,在整体式催化剂上形成了CuCoO固溶体;当Cu含量较高时,可以检测到CuO.在催化剂表面,Co以Co^2＋和Co^3＋形式存在,而Cu主要以Cu2＋形式存在.适量Cu的加入可以改善催化剂中Co的氧化还原性能,有利于催化剂活性的提高.在所制备的催化剂中,Cu0.5Co0.5/Al2O3/堇青石整体式催化剂活性最高,在315℃可以完全催化燃烧消除甲苯.A series of CuxCo1-x/Al2O3/cordierite（x=0–1）catalysts were prepared using cordierite as a support,a boehmite primer sol as the first washcoat layer and copper as well as cobalt oxides as the activity washcoat layer.The structure of the catalysts was characterized using X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,and temperature-programmed reduction.Toluene was chosen as a model compound to evaluate the catalytic activity in a conventional fixed-bed quartz reactor.The results indicate that CuCoO was present when the Cu content was low.CuO diffraction peaks were observed when the Cu content was high.Both Co^2＋ and Co^3＋ exist on the surface of the obtained monolithic catalysts while Cu^2＋ is the main Cu species.The addition of a certain amount of copper oxide improved the reducibility of the cobalt oxide,which enhanced the catalytic activity of the catalysts.All the obtained catalysts showed good activity for the catalytic combustion of toluene.The Cu0.5Co0.5/Al2O3/cordierite catalyst showed the best catalytic activity.Toluene was completely oxidized at 315℃.

关 键 词：铜 钴 堇青石 整体式催化剂 甲苯 催化燃烧 

分 类 号：O643.36[理学—物理化学]