利用多元醇共浸渍促进Ni/MCM-41催化剂的萘加氢活性

研究了利用乙二醇、甘油、木糖醇、山梨醇、葡萄糖多元醇共浸渍方法促进Ni负载在MCM-41载体上的萘加氢活性．和传统的浸渍方法比较，只要在硝酸盐的水溶液中添加适合量的多元醇即可以提高金属活性中心和载体表面的相互作用，导致5 nm以下超细NiO粒子的形成，以及高分散的催化活性中心和异常高的催化活性；零价Ni的纳米粒子从36.1 nm减少到5 nm以下，同时萘的加氢活性取决于零价Ni纳米粒子的大小．利用多元醇共浸渍制备的负载型催化剂表现出优异的催化活性，即使在55 oC的低温环境中亦表现出100%的萘转化率．

Promotion of Ni/MCM-41 Catalyst for Hydrogenation of Naphthalene by co-Impregnation with Polyols

The activities of nickel supported on MCM-41 catalysts, prepared by co-impregnation with polyols (ethylene glycol, glycerol, xylitol, sorbitol and glucose), were investigated by hydro-genation of naphthalene. Compared with the conventional wetness impregnation, addition of moderate polyols into the metal nitrate aqueous solution could enhance interaction with support surface, resulting in formation of very small NiO particle size (<5 nm), high dis-persion of the active phase and significant catalytic activity. Particle size of Ni⁰ decreased from 36.1 nm to below 5 nm; meanwhile the complete hydrogenation of naphthalene was dependent on the Ni0 particle size. The hydrogenation activities of the catalysts prepared by co-impregnation with polyols were very high with 100% conversion even at low temperature of 55 oC.