作　　者： ; ; ; ; ; ;

机构地区： 河南大学

出　　处： 《催化学报》 2005年第4期283-286,共4页

摘　　要： 用化学方法制备了负载金的纳米管钛酸(Au/H2Ti2O4(OH)2)光催化剂,并用TEM,XPS,XRD和DRS等技术对催化剂进行了表征.结果表明,经573K处理后,纳米管钛酸表面及管内均有零价的金颗粒存在.与纳米管钛酸(H2Ti2O4(OH)2)相比,Au/H2Ti2O4(OH)2具有明显的CO光催化氧化活性,但在暗态时无活性.经分析认为,暗态时Au与纳米管相互接触的周界处不活泼,故催化剂无CO催化氧化活性;紫外光照射下,纳米管激发产生e-h+对,e-从纳米管转移到Au0上,使纳米管和Au-在接触周界处产生相互作用,形成活性位,导致CO催化氧化反应发生. The Au photocatalyst loaded on titanic acid nanotube was prepared by a chemical method, and the structure and morphology of the catalyst were characterized by means of TEM, XPS, XRD and DRS. The results indicated that Au-0 nanoparticles were dispersed on both inner and outer surfaces of the titanic acid nanotube after the catalyst sample was treated at 573 K. The photocatalytic oxidation of CO on Au/titanic acid nanotube obviously occurred under UV light illumination, while it was inert in the dark. As for titanic acid nanotube, no CO oxidation was observed both in the dark and under UV light illumination. The photogenerated electrons transferred from titanic acid nanotube to Au- and the active sites were formed owing to the interaction between titanic acid nanotube and Au-0 at the contact perimeter under UV light illumination, which induced the CO oxidation. But in the dark, the Au-0 and titanic acid nanotube at the contact perimeter were inactive and no CO oxidation happened.

关 键 词： 纳米管 钛酸 金 负载型催化剂 一氧化碳 光催化氧化

领　　域： [理学] [理学]