多级孔La_(1-x)Sr_xCoO_3制备及其催化氧化甲烷性能  

Preparation of hierarchical pore La_(1-x)Sr_xCoO_3 catalysts and catalytic oxidation of methane over it

作　　者：王赛飞 王曼 钱恒力 李立奇 段二红[1,2] 

机构地区：[1]河北科技大学环境科学与工程学院,河北石家庄050018 [2]河北省污染防治生物技术实验室,河北石家庄050018

出　　处：《天然气化工—C1化学与化工》2017年第6期64-68,共5页Natural Gas Chemical Industry

基　　金：国家科技支撑计划项目(2014BAC23B04-03);河北省教育厅拔尖人才计划(BJ201402);河北省教育厅青年基金(QN2016039);河北省科学技术厅大气专项项目(17273902D);校立基金五大平台项目(1182038;1182054)

摘　　要：采用溶胶凝胶+水热法制备多级孔La_(1-x)Sr_xCoO_3(x=0,0.1,0.2,0.3)催化剂,通过XRD、BET和SEM手段表征催化剂结构,采用固定床测试其催化氧化甲烷的活性。结果表明,溶胶凝胶+水热法制备的La_(0.9)Sr_(0.1)CoO_3大介孔含量明显增加,N_2吸附量显著提高,出现清楚的多级孔结构,催化甲烷氧化活性最好,与未水热LaCoO_3和水热LaCoO_3和未水热La_(0.9)Sr_(0.1)CoO_3催化剂相比,T_(50)分别降低115.4℃、18.6℃和35.3℃。Hierarchical poreLa1-xSrxCoO3 （x=0, 0.1, 0.2, 0.3） catalysts were prepared by sol-gel and hydrothermal method and characterized by XRD, BET and SEM. The activities of the catalysts in catalytic oxidation of methane were tested in a fixed bed. The results show that the La1-xSrxCoO3 catalyst （LSC1） prepared by sol-gel and hydrothermal method has obviously increasing large mesopores and N2 adsorption capacity, appears a clear hierarchical pore structure, and possesses the best activity. The temperature of 50% conversion of methane （T50） over it was descreased by 115.4℃, 35.3℃ and 18.6℃ than that over the unhydrothermal LaCoO3, the hydrothermal LaCoO3 and the unhydrothermal La1-xSrxCoO3 catalysts, respectively.

关 键 词：多级孔 水热处理 锶 钴酸镧 甲烷 催化氧化 

分 类 号：O643.3[理学—物理化学] TQ426[理学—化学]