摘要
以丙烯酸铵为模板剂,由油柱成型法制备了系列球形Al2O3载体,采用XRD、BET等分析测试手段对其晶体结构、比表面积、孔容和孔径分布进行了表征,结果表明,600℃焙烧的球形γ-Al2O3载体具有介孔结构,并且比表面较不使用模板剂的样品有大幅度增加。焙烧温度升至960℃得到δ-Al2O3,介孔结构消失,但由于结构记忆效应,载体的大表面特性得以保持。以δ-Al2O3为载体制备Pd/Al2O3催化剂,采用氢-氧滴定(HOT)方法测定发现,比表面的增加显著提高了Pd金属的分散度,从而大幅度提高了催化剂的蒽醌加氢活性,氢化效率最高可达10.5 g.L-1。
A series of modified spherical alumina have been prepared via oil-drop method using acrylic ammonium as a template. The crystal structure, surface area, pore volume and pore size distribution of samples were characterized by XRD and BET measurements. The T-Al2O2 with mesoporous structure was obtained after calcination at 600 ℃ and the surface area has much improved than common spherical alumina. After calcination at 960 ℃, δ-Al2O3 was obtained. Although the mesoporous structure of δ-Al2O3 was disapeared, the high surface area was maintained due to its structure memory effect. The modified δ-Al2O3 were then used as support to prepare Pd catalysts using conventional impregnation method. The catalytic performances of the Pd catalysts were studied in the hydrogenation of ethylanthraquinone. Compared with the common Pal/alumina catalyst, Pal/acrylic ammonium modified alumina catalysts exhibited higher Pd dispersion which results in more catalytic active sites and much higher hydrogenation activity.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2013年第1期57-62,共6页
Chinese Journal of Inorganic Chemistry
基金
973国家重大科学问题导向项目(No.2011CBA00500)资助项目
关键词
油柱成型
PD
AL2O3催化剂
模板剂
过氧化氢
蒽醌法
oil-drop method
Pd/Al2O3 catalyst
template
hydrogen peroxide
ethylanthraquinone method
作者简介
通讯联系人。E—mail：lidq@mail．buct．edu．cn，Tel：010-64436992
