二次纳米自组装法制备Ni-Mo/TiO_2-Al_2O_3催化剂  

Preparation of Ni-Mo/TiO_2-Al_2O_3 Catalyst by Secondary Nanoscale Self-Assembly

作　　者：赵杉林[1] 李萍[2] 金英杰[1] 商丽艳[2] 李宽彪[1] 王鼎聪[3] 

机构地区：[1]辽宁石油化工大学石油化工学院,抚顺113001 [2]辽宁石油化工大学环境与生物工程学院,抚顺113001 [3]中国石化抚顺石油化工研究院,抚顺113001

出　　处：《纳米技术与精密工程》2011年第3期260-264,共5页Nanotechnology and Precision Engineering

基　　金：辽宁省自然科学基金资助项目(2051223)

摘　　要：依据框架式大孔容介孔固体材料的形成机理,采用二次纳米自组装法制备出高比表面积和大孔容的纳米TiO2-Al2O3载体.应用低温氮吸附、扫描电子显微镜(SEM)和透射电子显微镜(TEM)技术研究了TiO2助剂对TiO2-Al2O3载体的介孔结构和纳米粒子团聚效应的影响,以及浸渍方法对Ni-Mo/TiO2-Al2O3催化剂的孔结构和金属组分分散性的影响.结果表明,适量TiO2对纳米TiO2-Al2O3载体有较好的扩孔和抗聚集效应;二次纳米自组装TiO2-Al2O3(TiO2,20%)粉体具有较大的比表面积和比孔容以及低纳米尺度.分步浸渍法制备的催化剂上Ni-Mo活性组分具有良好的分散性,其分布较宽的介孔系统适合渣油的加氢精制过程.Based on the formation mechanism of framework structure for synthesis of mesoporous materials with large pore volume,binary TiO2-Al2O3 supports with high specific surface area and large pore volume were prepared using secondary nanoscale self-assembly.For the composite supports,the effect of TiO2 additive on the mesoporous structure and nanoparticle agglomeration was investigated by low temperature nitrogen adsorption,scanning electron microscope（SEM） and transmission electron microscope（TEM）,and different impregnations for Ni-Mo precursors were correlated with the pore structure and metal component dispersivity of Ni-Mo/TiO2-Al2O3 catalysts.The results indicate that additive TiO2 at proper ratios exhibits evident pore extension and aggregation resistance effects.The composite support containing 20% TiO2 obtained by secondary nanoscale self-assembly has high specific surface area and specific pore volume,as well as the small nanoparticle size.The Ni-Mo component dispersancy on the supports prepared with distributed impregnation is promoted and the catalysts with broadened pore distribution are applicable in the hydrotreating processes of residue.

关 键 词：纳米自组装 超增溶 氧化铝 二氧化钛 

分 类 号：TB383.1[一般工业技术—材料科学与工程]