纳米晶PbTiO_3负载CuO催化NO分解  

Catalytic Decomposition of Nitric Oxide over Nano-sized PbTiO_3 Supported Cupric Oxide

作　　者：邢丽[1] 薛念华[1] 陈向科[1] 郭学锋[1] 丁维平[1] 陈懿[1] 

机构地区：[1]介观化学教育部重点实验室南京大学化学系,南京210093

出　　处：《无机化学学报》2005年第5期729-732,共4页Chinese Journal of Inorganic Chemistry

基　　金：江苏省自然科学基金重点项目(No.BK2001201)资助。

摘　　要：A large specific surface area perovskite-type mixed oxide PbTiO3 supported cupric oxide was synthesized as a catalyst for NO decomposition and characterized by techniques such as XPS, XRD, H2-TPR before and after NO decomposition reactions. The catalytic properties were tested with a fix-bed micro-reactor. The results showed that the PbTiO3 was inactive for the reactions, but 1wt % Cu/PbTiO3 catalyst gave fairly good activities for NO decomposition at temperature as low as 473 K. Copper species were found well-dispersed but weakly interacted with the support before NO decomposition, and the NO decomposition caused significant change in the environment of the copper species, which became Cu(Ⅰ)and most probably incorporated into surface crystal lattice of the nano-sized PbTiO3. In NO reaction, a large amount of oxygen atoms from the decomposition of NO penetrated into the nano-sized PbTiO3 support and caused small expansion of crystal lattice. The transport of oxygen between the copper species and the catalyst support may be helpful to speed up the kinetic regeneration of active metal sites from oxygen occupancy and resulted in good catalytic performance.A large specific surface area perovskite-type mixed oxide PbTiO3 supported cupric oxide was synthesized as a catalyst for NO decomposition and characterized by techniques such as XPS, XRD, H-2-TPR before and after NO decomposition reactions. The catalytic properties were tested with a fix-bed micro-reactor. The results showed that the PbTiO3 was inactive for the reactions, but 1 wt % Cu/PbTiO3 catalyst gave fairly good activities for NO decomposition at temperature as low as 473 K. Copper species were found well-dispersed but weakly interacted with the support before NO decomposition, and the NO decomposition caused significant change in the environment of the copper species, which became Cu(I) and most probably incorporated into surface crystal lattice of the nano-sized PbTiO3. In NO reaction, a large amount of oxygen atoms from the decomposition of NO penetrated into the nano-sized PbTiO3 support and caused small expansion of crystal lattice. The transport of oxygen between the copper species and the catalyst support may be helpful to speed up the kinetic regeneration of active metal sites from oxygen occupancy and resulted in good catalytic performance.

关 键 词：PBTIO3 catalyst surface crystal CUO 纳米晶 transport performa lattice 分解 催化 负载 active the with and after Cu(Ⅰ) small speed metal The area MOST was XPS XRD MAY in be 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术] TM223[自动化与计算机技术—计算机科学与技术]