A novel method for synthesis of a Ni/Al2O3 catalyst with a mesoporous structure using stearic acid salts

Kim, Younghun; Kim, Pil; Kim, Changmook; Yi, Jongheop

doi:10.1039/b303049k

Cited by 45 publications

(45 citation statements)

References 19 publications

(27 reference statements)

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“…As an extension of the synthesis of mesoporous silica and mesoporous aluminosilicates [12], aluminas with ordered mesopores are commonly prepared from self assembly based on sol-gel processes in the presence of templates. This synthesis method consists of multistep procedures including hydrolysis and condensation, filtration and washing, and calcination to remove surfactants [13][14][15][16][17]. Whereas, the collapse of the mesostructure after calcination [18,19], the high cost of additives, and the complexity of the multistep process limits the practical application of present synthesis approaches.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Liu

2010

Chemical Engineering Journal

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a b s t r a c tMesoporous transition alumina was prepared by spray pyrolysis of an alumisol precursor, without the use of structure-directing reagents. The prepared alumina exhibited a well-defined mesoporous structure with narrow pore size distribution (3.0-4.7 nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to ␥-Al 2 O 3 andAl 2 O 3 was observed at 800 and 1200• C, respectively. An increase in preparation temperature resulted in a decrease in surface area and pore volume and an increase in pore size. Longer residence time promoted the crystallinity of prepared alumina effectively, but it also led to the formation of particles with smaller surface area, lower pore volume, larger pore size, and broader pore size distribution. Additionally, while alumisol concentration had little effect on the surface area, its reduction led to a decrease in pore volume and pore size and caused the formation of bimodal pore size distribution. The as-prepared alumina also exhibited excellent thermal stability, showing great application potential for industry.

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Section: Introductionmentioning

confidence: 99%

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Liu

2010

Chemical Engineering Journal

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“…It is known that bimetallic catalysts have several beneficial effects in terms of catalyst deactivation, product selectivity, and catalytic performance, owing to the electronic or geometric effect of metal surfaces referred to as an alloying effect [61][62][63][64][65]. Figure 5 shows the schematic procedure for the preparation of mesoporous NiMg-Alumina catalysts [10,66]. Bimetallic NiMg-stearates were prepared by controlling the pH of mixed solutions of magnesium stearate and nickel nitrate.…”

Section: Bimetallic Nimg-alumina With Mesoporosity For the Hydrodechlmentioning

confidence: 99%

“…Due to the unique textural properties of mesoporous materials such as high surface area and large pore volume with a narrow pore size distribution, ordered mesoporous materials prepared by a templating method have attracted considerable attention during last decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Ordered mesoporous materials have been widely employed in many fields of science and engineering, including separation [18] and catalysis [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation of nickel-mesoporous materials and their application to the hydrodechlorination of chlorinated organic compounds

Kim

Kang

et al. 2007

Catal Surv Asia

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Mesoporous materials have attracted considerable attention for use as a catalyst or a catalyst support due to their remarkable textural properties such as high surface area and large pore volume with a narrow pore size distribution. Many efforts have been made to design mesoporous materials for use in heterogeneous catalyst systems. Recent progress and results regarding the preparation of nickel-mesoporous materials and their application to the hydrodechlorination of chlorinated organic compounds were discussed in this review. Mesoporous materials were used as a support for nickel catalyst or a nickel-incorporated mesoporous catalytic material in this work. Two research areas were described and discussed in this review. One is the preparation of mesoporous alumina-supported nickel catalysts and their application to the hydrodechlorination of 1,2-dichloropropane and o-dichlorobenzene. The other is the preparation of mesoporous silica-supported nickel catalysts and their application to the hydrodechlorination of 1,1,2-trichloroethane and chlorobenzene.

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“…It is known that mesoporous aluminas have a three-dimensional interconnected pore system in the form of sponge-like structure, which is a great advantage in the catalytic applications [20][21][22][23]. Our research group has prepared pure mesoporous alumina at an ambient temperature and an atmospheric pressure, by reacting an aluminum alkoxide with various carboxylic acids in the presence of controlled amounts of water [5,10,11]. The prepared mesoporous aluminas were found to have high surface area and randomly distributed mesopores with narrow pore size distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Mesoporous materials prepared by a self-assembled surfactant aggregate have been widely studied and employed in many fields of material science and engineering due to their remarkable properties such as high surface area, large pore volume, and narrow pore size distribution [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. These materials are potentially important as highly efficient catalyst supports because of the merit of controllable porosity that makes supported catalysts have desirable level of diffusion efficiency.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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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 Nialumina catalysts (ca. 5.2 nm for Ni-alumina-pre and ca. 6.8 nm for Ni-alumina-post) after reduction at 550°C, while a catalyst prepared without a template (NiAl-comp) exhibited inferior porosity with large metal particles (ca. 12.3 nm). Mesoporous Nialumina 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 Nialumina 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 Nialumina-post catalyst.

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A novel method for synthesis of a Ni/Al2O3 catalyst with a mesoporous structure using stearic acid salts

Cited by 45 publications

References 19 publications

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Preparation of nickel-mesoporous materials and their application to the hydrodechlorination of chlorinated organic compounds

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

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