La_2O_3对NiCu/MgSiO催化剂的甲烷部分氧化制氢反应性能的影响  

Effect of La_2O_3 on Preparation of H_2 by Partial Oxidation of CH_4 over Ni-Cu/MgSiO Catalyst

作　　者：王爱菊[1] 钟顺和[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《催化学报》2004年第2期101-106,共6页

基　　金：国家重大基础研究前期研究专项资助项目 ( 2 0 0 1CCA0 3 60 0 )

摘　　要：用等体积浸渍法制备了MgO SiO2 (MgSiO)复合氧化物负载的Ni Cu双金属催化剂 ,采用程序升温还原 (TPR) ,X光电子能谱 (XPS) ,红外光谱 (IR) ,程序升温脱附 (TPD)及微反技术考察了稀土La2 O3 的加入对CH4和H2 O在Ni Cu/MgSiO催化剂表面上的吸附及甲烷部分氧化制氢反应性能的影响 .结果表明 ,加入La2 O3 使催化剂表面Ni和Cu原子的电子云密度增加 ,CH4和H2 O在催化剂表面上的吸附增强 .CH4与O2 和H2 O在Ni Cu/MgSiO催化剂上反应的主要产物为H2 和CO2 .La2 O3 的加入有利于提高CH4转化率及H2 的选择性 ,并可提高催化剂稳定性及抗积炭能力 .讨论了La2 O3 的助催化作用机理 .MgO-SiO 2 (MgSiO) supported Ni-Cu-La 2O 3 catalyst for partial oxidation of CH 4 to produce hydrogen was prepared by isovolumic impregnation. Based on TPR, XPS, IR, TPD and microreactor techniques, the effect of La 2O 3 on the adsorption of CH 4 and H 2O and the catalytic performance of the catalyst was studied. The results showed that the addition of La 2O 3 has obvious influence on the electrical charge distribution of Ni, Cu metal active sites on Ni-Cu/MgSiO catalyst, and increases the chemisorption intensity of CH 4 and H 2O. The main products of CH 4 partial oxidation by H 2O and O 2 on the Ni-Cu-La 2O 3/MgSiO catalyst are H 2 and CO 2. With the addition of La 2O 3, the conversion of CH 4, the selectivity for H 2 and the catalyst stability increase, and coke deposition decreases. Moreover, the catalytic mechanism of La 2O 3 promotion was discussed.

关 键 词：氧化镧 镍 铜 氧化镁 二氧化硅 甲烷部分氧化 氢气 制备 LA2O3 在Ni-Cu/MgSiO催化剂 

分 类 号：O643.3[理学—物理化学]