NO Oxidation Catalysis on Copper Doped Hexagonal Phase LaCoO3: A Combined Experimental and Theoretic

• 作 者: ChenZhou;ChunzhengWu;HongfengYin;WeiGuoWang;
• 机 构: Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo315201,
• 出 处: 2014年全国博士后新材料技术与应用学术论坛
• 发表日期: 2014年期

　　Cobalt-based perovskite catalysts showed excellent performance towards NO-NO2 oxidation.We systematically investigated the influence of different level of Cu-doping on the catalytic performance of hexagonal phase LaCoO3 (LaCo1-xCuxO3 (x =0.1, 0.2, 0.3)) for NO oxidation.The catalytic activities of the oxide catalysts followed the sequence: LaCo0.9Cu0.1O3>LaCoO3>LaCo0.8Cu0.2O3>LaCo0.7Cu0.3O3 where the highest NO conversion for LaCo0.9Cu0.1O3 was 82% at 310 ℃.The relevant structural characterizations were conducted by XRD, BET, FTIR and TEM.The interaction between Co and Cu promoted the conversion of NO to NO2.With increasing Cu doping content, the decrease of the performance resulted from the generation of isolated CuO on the surface of the oxides confirmed by H2-TPR and XPS.Combined with first-principle calculations, we explored the reaction mechanism of NO oxidation on the surface and found that Cu doping would facilitate the reaction by decreasing the oxygen vacancy formation energy and the NO2 desorption barrier from the Co-or Cu-Nitrite.