P123软模板对CuO-CeO_2结构及其CO催化氧化性能的影响  

Effect of P123 on Structure and CO Catalytic Oxidation Performance of CuO-CeO_2 Catalysts

作　　者：张秋林[1] 徐利斯 刘昕[1] 宁平[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500

出　　处：《无机化学学报》2015年第8期1555-1562,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21307047;U1137603)资助项目

摘　　要：采用软模板水热法制备了不同Cu/Ce物质的量之比的Cu O-Ce O2(nCu∶nCe=1∶9、2∶8、3∶7、4∶6、5∶5、6∶4、7∶3)催化剂。考察了nCu∶nCe和制备方法(软模板水热法和无模板共沉淀法)对Cu O-Ce O2催化剂低温催化氧化CO性能的影响,并采用XRD、N2-吸附脱附、TEM、H2-TPR和XPS等表征手段对催化剂的结构、氧化还原特性和表面化学状态等进行了分析。结果表明,随着nCu∶nCe的增加,Cu O-Ce O2催化剂的CO催化氧化活性先升高后降低。当nCu∶nCe=5∶5时,催化剂在100℃时CO转化率即达到90%以上。采用软模板水热法制备的Cu O-Ce O2催化剂大的比表面积、狭窄的孔道分布结构、活性Cu O物种高的分散状态和Cu O与Ce O2之间存在强相互作用是其具有优异的CO催化氧化活性的主要原因。A series of CuO-CeO2 （ncu： nc,=1：9, 2：8, 3：7, 4：6, 5：5, 6：4, 7：3） catalysts with different Cu/Ce molar ratios （ncu：nce） were prepared by soft template hydrothermal method. The effect of ncu：nc, and preparation methods （soft template hydrothermal method and co-precipitation without template method） on CO catalytic oxidation performance was investigated, and the structure, reduction features and surface chemical states of the CuO-CeO2 catalysts were characterized by XRD, TEM, low temperature adsorption-desorption, temperature programmed reduction （H2-TPR） and XPS. The results show that with the increase of ncu ：nce, the CO catalytic oxidation activities of CuO-CeO2 catalysts increase firstly and then decrease. When the ncu ：no, is 5：5, the CO catalytic oxidation activity of the catalyst is more than 90% at 100 ℃. The large specific surface area, narrow pore structure distribution, high dispersion of active CuO species and the strong interaction between CuO and CeO2 of CuO-CeO2 catalyst prepared by soft template hydrothermal method are the main factors for its excellent CO catalytic oxidation activity.

关 键 词：软模板 CuO-CeO2催化剂 CO氧化 

分 类 号：O643.32[理学—物理化学]