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机构地区:[1]天津大学化工学院,天津300072
出 处:《石油化工》2004年第8期709-713,共5页Petrochemical Technology
基 金:国家重大基础研究前期研究专项(2001CCA03600)资助项目
摘 要:采用表面复合氧化物MgO-SiO2(MgSiO)作为载体,用等体积浸渍法制备出Ni-Cu双金属催化剂。通过XRD,BET,TEM等方法对催化剂进行表征,用微反技术考察温度、空速及原料气组成对反应性能的影响。并与添加La2O3助剂的双金属催化剂反应性能相比较。实验结果表明,在Ni-Cu/MgSiO催化剂表面上存在着均匀分散的Ni,Cu金属颗粒;反应最佳条件为反应温度450℃、进料组成n(CH4)/n(O2)/n(H2O)=1/0.5/2.5以及甲烷空速1 200h-1,此时Ni-Cu/MgSiO催化剂上CH4转化率在96%以上,H2的选择性可达99%,而添加La2O3助剂后,CH4转化率及H2选择性均提高。MgO-SiO2(MgSiO) supported Ni-Cu bimetallic catalyst was prepared by isovolumic impregnation. Surface structure of the catalyst was characterized by techniques of XRD, BET and TEM. Effects of reaction temperature , space velocity and feed composition on catalytic performance were studied with microreactor system technique, and the reaction results were compared with those of La2O3 promoted catalyst. Evenly-distributed Ni -Cu metallic particles existed on surface of catalyst. Under optimal conditions of reaction (reaction temperature 450 ℃ ;mole ration of CH4/O2/H2O = 1/0.5/2.5;velocity of methane 1 200 h-1)conversion of CH4 on the catalyst was over 96% ,and the selectivity of H2 was up to 99% . Addition of La2O3 as promoter, increased the conversion of CH4 and selectivity of H2.
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