Abstract: Using the SuperSolubilization Nanometer SelfAssembly method, bulk  N i - A l 2O3 catalyst is prepared with nickelnitratehexahydrate as the precursor and urea as precipitation agent, the mixture of the surfactantgather isobutylene maleic acid triethanolamine esters and petroleum hydrocarbon150SN as template agent. The  N i - A l 2O3  catalysts were characterized by TEM and TPR, and reaction mechanism of precipitation was studied. The results indicate that nanosized  N i - A l 2O3  bulk catalyst has a crystalline form with not only spherical shape，but also nanorod and nanometer silk, etc. Particles prepared by this method have good dispersion and uniform size, and narrow diameter distribution is observed between 10～50 nm. The N i - A l 2O3  reduced by hydrogen also has a crystalline form, and nanostructure of reduced  N i - A l 2O3  is more orderly than before. Particles size after reduction is still in the nanoparticles scope. TPR results show that there are two reduction peak appeared in the structure of nanometer bulk  N i - A l 2O3  catalyst,and the lowtemperature peak is NiO，high temperature reduction peak attributes to spinel structure which produced by the interaction of nickel and aluminum oxide.

Key words: Supersolubilization, Selfassembly, Nanometer, NiAl2O3, Bulk, Surfactant, Dispersion

摘要： 以尿素为沉淀剂、 六水硝酸镍为前躯体、 表面活性剂( 聚异丁烯马来酸三乙醇胺酯) 和石油烃 - 1 5 0 S N混合物作为模板剂, 采用超增溶自组装法制得纳米 N i - A l 2O3 体相催化剂。对 N i - A l 2O3 体相催化剂进行了 T EM 表征和氢气还原曲线( T P R) 分析, 并对沉淀反应的机理进行了探讨。结果表明, 超增溶自组装纳米N i - A l 2O3 体相催化剂是晶体结构, 形状除了球形, 还有纳米棒、 纳米丝等其他形状; 通过超增溶自组装法制备出的微粒分散性良好, 颗粒均匀、 粒径分布( 1 0~5 0n m) 较窄。N i - A l 2O3 经过 H2还原后仍是规整有序的晶体, 而且还原后比还原前的晶体结构要规整有序, 还原后的颗粒的粒径仍在纳米粒子范围内, 属于纳米颗粒。T P R分析结果表明, 曲线出现了两个还原峰, 低温峰归属于 N i O结构, 高温峰归属于镍与氧化铝相互作用产生的表面尖晶石结构。

关键词:  超增溶, 自组装, 纳米, N i - A l 2O3, 体相, 表面活性剂, 分散性