预处理气氛对CuO/CeO_2/γ-Al_2O_3催化剂表面性质及“NO+CO”反应性能的影响(英文)  

CuO/CeO_2/γ-Al_2O_3 Catalysts:Effect of Pretreating Atmosphere on Surface Properties and Catalytic Performance in Selective Catalytic Reduction of NO with CO

作　　者：朱捷[1] 葛奉娟[1] 

机构地区：[1]徐州工程学院化学化工学院,徐州221111

出　　处：《无机化学学报》2015年第1期191-197,共7页Chinese Journal of Inorganic Chemistry

基　　金：江苏省高校自然科学基金(No.12KJD530002)资助项目

摘　　要：用不同的预处理气氛制备了CeO2/γ-Al2O3载体以调节表面Ce的价态,并以Cu(CH3COO)2为前驱体制备了CuCeAl催化剂。XRD和H2-TPR的结果表明在还原气氛下处理的CeO2/γ-Al2O3载体具有更多的活性氧原子,因此相应的CuCeAl催化剂表面有更多分散态的Cu2+/Cu+物种。NO+CO反应的结果表明分散态的Cu2+/Cu+是NO转化的活性物质,而Cu0在低温下具有较好的N2选择性。因此,同时含有分散态Cu2+/Cu+和少量晶相Cu0的催化剂具有最好的催化性能。The CeO2/γ-Al2O3 supports were prepared and pretreated in different atmospheres to adjust the valence state of surface Ce element,then Cu（CH3COO）2was impregnated as the precursor to prepare CuCeAl samples.XRD and H2-TPR results indicate that the CeO2/γ-Al2O3 support pretreated by reducing atmosphere has more active oxygen atoms,consequently has more dispersed Cu^2＋/Cu^＋ species on the surface.The ＂NO＋CO＂ reaction tests reveal that the dispersed Cu^2＋/Cu^＋ are the active species for NO conversion,while crystalline Cu^0 promotes the N2 selectivity at low temperatures.Hence,the catalysts containing both dispersed Cu2 ＋/Cu^＋ and a few crystalline Cu0 have the optimal catalytic efficiency.

关 键 词：多相催化 氮氧化物 污染防治 预处理气氛 CeO2/γ-Al2O3 “NO+CO”反应 

分 类 号：O611.62[理学—无机化学]