NiO-La_2O_3-Al_2O_3气凝胶催化剂的制备

采用改进的溶胶 -凝胶法和超临界干燥技术制备出超细三元 Ni O- L a2 O3 - Al2 O3 气凝胶催化剂 .通过 BET、TEM、XRD、DTA、IR等物性表征 ,考察了煅烧温度和组成等对气凝胶催化剂制备的影响 .结果表明 ,此种方法制备的多元气凝胶催化剂不仅保留了氧化铝和 Ni O- Al2 O3 气凝胶的主要特征 ,而且 ,氧化镧的加入使气凝胶更易晶化 ,热稳定性更好和吸附能力更强 .这种改进的溶胶 -凝胶法和超临界干燥技术操作简单有效 ,适合要求组分之间相互作用强、分布均匀、结构热稳定性好的多组元负载催化剂的制备 .

Preparation of NiO-La_2O_3-Al_2O_3 Aerogel Catalyst

The superfine of ternary NiO La 2O 3 Al 2O 3 aerogel catalysts were prepared by sol gel method in combination with supercritical drying(SCD) technique. The BET, TEM, XRD, DTA and IR measurement results showed that the aerogel was similiar with the single Al 2O 3 or binary NiO Al 2O 3 aerogel in surface area, apparent density, pore size distribution and structure, but exhibited a better quality. The ternany is easier to crystallize and form NiAl 2O 4 spinal structure and have a stronger adsorbability.