以Β-环糊精为介质的高分散钯催化剂的制备及其催化性能  

Preparation and Catalytic Performance of Palladium Catalyst Highly Dispersed by β-Cyclodextrin

作　　者：王寰[1] 张雪军[1] 张明慧[1] 李伟[1] 牟诗诚 陶克毅[1] 

机构地区：[1]南开大学化学学院材料化学系新催化材料科学研究所,天津300071 [2]国家纳米技术产业化基地,天津300457

出　　处：《催化学报》2006年第2期124-128,共5页

基　　金：国家自然科学基金(20273035;20233030);天津市自然科学基金(033802511);南开大学创新课题基金资助项目

摘　　要：以Β-环糊精(-ΒCD)为配体制备了PD--ΒCD胶体溶液,通过紫外-可见光谱和高倍透射电镜(HRTEM)等方法对其进行了表征,考察了胶体形貌并推测其络合方式.将此胶体负载于氧化铝载体上制备了新型高分散钯催化剂PD--ΒCD/-ΓAL2O3,采用红外光谱和HRTEM等表征方法考察了其活性中心的负载情况.考察了催化剂对2-乙基蒽醌加氢反应的催化性能,并与浸渍焙烧法制备的PDO/-ΓAL2O3催化剂进行了对比.结果表明,以-ΒCD为介质制得的PD--ΒCD/-ΓAL2O3催化剂的活性中心钯高分散在载体上,催化剂的活性更高,其氢化效率比PDO/-ΓAL2O3高15.4%.The Pd-β-CD colloid was prepared using H2PdCl4 aqueous solution and β-cyclodextrin （β-CD） powders as the starting materials, and characterized by ultraviolet-visible spectroscopy and high transmission electron microscopy （HRTEM）. The colloid was supported on γ-Al2O3 to obtain a Pd-β-CD/γ-Al2O3 catalyst. The HRTEM result shows that Pd nanoparticles with a mean size of 3-4 nm are highly dispersed on γ-Al2O3 in the supported catalyst, which can be attributed to the dilution effect of β-CD as the ligand. In the hydrogenation of 2-ethylanthraquinone, the Pd-β-CD/γ-Al2O3 catalyst exhibits better catalytic activity than the PdO/γ-Al2O3 catalyst prepared by the impregnation-calcination method.

关 键 词：Γ-环糊精 钯 氧化铝 胶体 分散度 负载型催化剂 蒽醌 加氢 

分 类 号：O643.36[理学—物理化学]