Crystallization Deactivation of Ni–P/SiO2 Amorphous Catalystand the Stabilizing Effect of Silica Support on the Ni–P Amorphous Structure

Li, Hexing; Wang, Weijiang; Li, Hui; Deng, Jing‐Fa

doi:10.1006/jcat.2000.2944

Cited by 100 publications

(18 citation statements)

References 51 publications

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“…By chemical reduction, amorphous nickel phosphorous alloys can be prepared simply and used as selective hydrogenation catalysts with a high activity [24,25]. However, these amorphous catalysts are easily transformed into less active crystalline compounds [26]. Another drawback of the amorphous nickel phosphorus alloys is their selectivity to sulfur-containing compounds, which leads to deactivation [27].…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde over SiO2 Supported Nickel Phosphide Catalysts

2008

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A series of SiO 2 supported transition metal (Fe, Co, Ni, Mo and W) phosphide catalysts were synthesized and tested for the selective hydrogenation of cinnamaldehyde (CMA). Among these tested catalysts, Ni 12 P 5 /SiO 2 and Ni 2 P/SiO 2 prepared with initial Ni/P ratios of 2/1.3 and 1/1 exhibited high activity and selectivity for the conversion of CMA to hydrocinnamaldehyde (HCMA). The two nickel phosphide catalysts showed selectivity to HCMA up to 90% at a conversion of 90%. The properties of the nickel phosphide catalysts were characterized by BET surface area determinations, X-ray powder diffraction (XRD) analysis, and transmission electron microscopy (TEM). The influences of reaction temperature, hydrogen pressure, Ni/P ratio, and reduction temperature were studied in detail. For comparison, Pd/SiO 2 catalyst was also used in this reaction, and the possible reasons for the different catalytic performances of the two kinds of catalysts are presented.

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Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde over SiO2 Supported Nickel Phosphide Catalysts

2008

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“…investigated widely. Klabunde et al [16][17][18][19][20], Chen et al [21][22][23][24] and Deng et al [25][26][27][28][29][30][31][32][33][34][35][36][37] have investigated the reduction mechanism thoroughly. It has been found that the mechanisms mainly depended on the types of metal ions or salts, properties of metal ions, pH values of solution and the solvent selected.…”

Section: Surface Properties Of Amorphous Alloy Nanoparticlesmentioning

confidence: 99%

“…After that, Klabunde et al [16][17][18][19][20] and Chen et al [21][22][23][24] studied the mechanism of borohydride reduction and the relation between properties and preparation conditions. On the other hand, Deng and coworkers have been interested in studying the properties of amorphous alloy particles and the application of metal boron (MB) and metal phosphorus (MP) amorphous alloys for catalytic hydrogenation [25][26][27][28][29][30][31][32][33][34][35][36][37]. Dragieva et al focused on developing amorphous alloys as electrode or catalytic oxidation materials [38][39][40][41][42][43], while Chen and coworkers prepared MPB alloy nanoparticle catalysts for various selective hydrogenation reactions [44][45][46][47][48][49][50].…”

Section: History Of Amorphous Alloy Catalystmentioning

confidence: 99%

Advances in chemical synthesis and application of metal-metalloid amorphous alloy nanoparticulate catalysts

Zhang

et al. 2007

Front. Chem. Eng. China

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This paper reviews the advances in the chemical synthesis and application of metal-metalloid amorphous alloy nanoparticles consisting of transition metal (M) and metalloid elements (B, P). After a brief introduction on the history of amorphous alloy catalysts, the paper focuses on the properties and characterization of amorphous alloy catalysts, and recent developments in the solution-phase synthesis of amorphous alloy nanoparticles. This paper further outlines the applications of amorphous alloys, with special emphasis on the problems and strategies for the application of amorphous alloy nanoparticles in catalytic reactions. History of amorphous alloy catalystAmorphous alloys have been extensively investigated internationally over the last 50 years largely spurred by their unique electronic, magnetic and surface properties and their increasing utility in a broad range of applications [1,2]. The amorphous alloy nanoparticles have gained increasing attention as novel catalytic materials since 1980, with the unique isotropic structure and high concentration of coordinatively unsaturated sites leading to catalytic activity and selectivity superior to their crystalline counterparts [3]. Especially, amorphous alloys chemically reduced by borohydride (BH 4 − ) and hypophosphite (H 2 PO 2 − ) have nanosized morphology and consequently higher surface area and activity than those prepared by the quenching method [4][5][6][7][8]. It has been regarded that the amorphous alloy catalyst can be a potential alternative to Raney nickel or noble metal catalyst in catalytic hydrogenation. Raney nickel has shown many serious disadvantages, such as short lifetimes due to poor sulfur resistance and environmental pollution caused by alkaline leaching during preparation. In contrast, the amorphous alloy nanoparticulate catalysts are inexpensive, environmentally benign, and effective catalytic materials.For the chemical synthesis of metal-metalloid amorphous alloy catalysts, Brown et al. and Paul et al. found that the NiB particles reduced by sodium borohydride in water or ethanol solution showed excellent catalytic activity and selectivity in many hydrogenation reactions [9][10][11][12][13][14][15]. After that, and Chen et al. [21][22][23][24] studied the mechanism of borohydride reduction and the relation between properties and preparation conditions. On the other hand, Deng and coworkers have been interested in studying the properties of amorphous alloy particles and the application of metal boron (MB) and metal phosphorus (MP) amorphous alloys for catalytic hydrogenation [25-37]. Dragieva et al. focused on developing amorphous alloys as electrode or catalytic oxidation materials [38-43], while Chen and coworkers prepared MPB alloy nanoparticle catalysts for various selective hydrogenation reactions [44-50]. Amorphous alloy nanoparticulate catalysts have been widely studied by different research groups in China [51-60]. Among them, our group has attempted to develop NiB and NiP industrial amorphous alloy catalysts in various catalyt...

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“…To date, most studies have focused on the design of new amorphous alloys by chemical reduction and a great number of amorphous alloys including Ni(Co, Ru, Fe)-B/P have been reported [6][7][8][9][10]. Nearly all the amorphous alloys reported so far are present in the form of nonporous spherical nanoparticles.…”

Section: Introductionmentioning

confidence: 97%

Co–B amorphous alloy nanochains with enhanced magnetization and electrochemical activity prepared in a biphasic system

Wang

Zhao

et al. 2008

Applied Surface Science

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Crystallization Deactivation of Ni–P/SiO2 Amorphous Catalystand the Stabilizing Effect of Silica Support on the Ni–P Amorphous Structure

Cited by 100 publications

References 51 publications

Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde over SiO2 Supported Nickel Phosphide Catalysts

Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde over SiO2 Supported Nickel Phosphide Catalysts

Advances in chemical synthesis and application of metal-metalloid amorphous alloy nanoparticulate catalysts

Co–B amorphous alloy nanochains with enhanced magnetization and electrochemical activity prepared in a biphasic system

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