共 51 条
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.
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页码:181 / 189
页数:9
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