Preparation of mesoporous Ni-alumina catalyst by one-step sol-gel method:: Control of textural properties and catalytic application to the hydrodechlorination of o-dichlorobenzene

被引:52
作者
Kim, P [1 ]
Joo, JB [1 ]
Kim, H [1 ]
Kim, W [1 ]
Kim, Y [1 ]
Song, IK [1 ]
Yi, J [1 ]
机构
[1] Seoul Natl Univ, Inst Chem Proc, Sch Chem & Biol Engn, Seoul 151744, South Korea
关键词
mesoporous Ni-alumina catalyst; template; one-step sol-gel method; hydrodechlorination; o-dichlorobenzene;
D O I
10.1007/s10562-005-7949-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mesoporous Ni-alumina catalysts (Ni-alumina-pre and Ni-alumina-post) were synthesized by one-step sol-gel method using micelle complex comprising lauric acid and nickel ion as a template with metal source and using aluminum sec-butoxide as an aluminum source. The Ni-alumina catalysts showed relatively high surface areas (303 m(2)/g for Ni-alumina-pre and 331 m(2)/g for Ni-alumina-post) and narrow pore size distributions centered at ca. 4 nm. Highly dispersed Ni particles were observed in the Ni-alumina catalysts (ca. 5.2 nm for Ni-alumina-pre and ca. 6.8 nm for Ni-alumina-post) after reduction at 550 degrees C, while a catalyst prepared without a template (NiAl-comp) exhibited inferior porosity with large metal particles (ca. 12.3 nm). Mesoporous Ni-alumina catalysts with different porosity were obtained by employing different hydrolysis step of aluminum source. When aluminum source was hydrolyzed under the presence of micelle complex, a supported Ni catalyst with highly developed framework mesoporosity was obtained (Ni-alumina-post). On the other hand, when aluminum source was pre-hydrolyzed followed by mixing with micelle solution, the resulting catalyst (Ni-alumina-pre) retained high portion of textural porosity. It was revealed that the hydrolysis method employed in this research affected not only textural properties but also metal-support interaction in the Ni-alumina catalysts. It was also found that the Ni-alumina-pre catalyst exhibited weaker interaction between nickel and alumina than the Ni-alumina-post, leading to higher degree of reduction in the Ni-alumina-pre catalyst. In the hydrodechlorination of o-dichlorobenzene, the Ni-alumina catalysts exhibited better catalytic performance than the NiAl-comp catalyst, which was attributed to higher metal dispersion in the Ni-alumina catalysts. In particular, the Ni-alumina-pre catalyst showing 1.5 times higher degree of reduction and larger amounts of o-dichlorobenzene adsorption exhibited better catalytic performance than the Ni-alumina-post catalyst.
引用
收藏
页码:181 / 189
页数:9
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