Surface modified bimetallic catalysts: Preparation, characterization, and applications

Stytsenko, V. D.

doi:10.1016/0926-860x(95)00012-7

Cited by 40 publications

(24 citation statements)

References 24 publications

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“…The oxygen uptakes were measured using pulse chemisorption of 5% O 2 /He gas mixture. The O 2 uptakes and the Ni metal surface areas were calculated with respect to NiO phase [28,29]. The carbon contents were measured using VARIO EL, CHNS analyser.…”

Section: Methodsmentioning

confidence: 99%

Pure H2 Production by Decomposition of Methane Over Ni Supported on Hydroxyapatite Catalysts

et al. 2007

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The catalytic decomposition of CH 4 for the production of pure H 2 is carried out over Ni supported on hydroxyapatite [Ca 5 (PO 4 ) 3 (OH)] catalysts at 650°C and atmospheric pressure. CH 4 decomposition activity is decreased with time on stream and finally deactivated completely. The physicochemical properties of the fresh catalysts are characterized by XRD, DTA/TG, TPR and SEM techniques along with CHNS analyses of the used samples. It is found that the 30 wt% Ni/HAp displayed higher H 2 production rates over the other Ni loadings, which is correlated with Ni metal surface area measured by O 2 pulse chemisorption.

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Section: Methodsmentioning

confidence: 99%

Pure H2 Production by Decomposition of Methane Over Ni Supported on Hydroxyapatite Catalysts

et al. 2007

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“…After TPR analysis the same sample was cooled to 430°C in helium gas, out gassed at this temperature for 30 min, followed by titration with 5.01% O 2 in helium gas at 430°C. The O 2 uptakes were calculated assuming the formation of NiO phase [22]. The carbon analysis data was collected with VARIO EL CHNS analyser.…”

Section: Exprimentalmentioning

confidence: 99%

Production of COX Free Hydrogen by Catalytic Decomposition of Methane Over Ni/HY Catalysts

et al. 2007

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In this present paper, we report catalytic decomposition of methane over Ni/HY catalysts, with varying Ni loading at 550°C and atmospheric pressure. The relationships between catalyst performance and characterization of the fresh and used form of catalysts are discussed from the data obtained by scanning electron microscopy, X-ray diffraction analysis, temperature programmed reduction, O 2 pulse chemisorption and carbon elemental analyses. It is observed that, the catalytic activity of Ni/HY catalysts is high at initial stages and gradually decreased with time and finally deactivated completely. The yield of hydrogen and carbon nanofibers is strongly dependent on Ni loading. It is found that 20 wt% Ni/HY catalyst showed higher hydrogen yield over the other loadings.

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“…Recently, bimetallic catalysts become more important in heterogeneous catalysis, because bimetallic catalysts can be superior to monometallic catalysts in the catalytic activity and selectivity for many reactions [21]. Similarly, in order to improve the catalytic activity and selectivity in the hydrogenolysis of glycerol, it is also desired to investigate bimetallic catalysts while on the development of monometallic catalysts.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenolysis of Glycerol to Propanediols Over Highly Active Ru–Re Bimetallic Catalysts

2009

Top Catal

114

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Several supported Ru-Re bimetallic catalysts (Ru-Re/SiO 2 , Ru-Re/ZrO 2 , Ru-Re/TiO 2 , Ru-Re/H-b, Ru-Re/H-ZSM5) and Ru monometallic catalysts (Ru/SiO 2 , Ru/ZrO 2 , Ru/TiO 2 , Ru/H-b, Ru/H-ZSM5) were prepared and their catalytic performances were evaluated in the hydrogenolysis of glycerol to propanediols (1,2-propanediol and 1,3-propanediol) with a batch type reactor (autoclave) under the reaction conditions of 160°C, 8.0 MPa and 8 h. Compared with Ru monometallic catalysts, the Ru-Re bimetallic catalysts showed much higher activity in the hydrogenolysis of glycerol, and Re exhibited obvious promoting effect on the performance of the catalysts. The supported Ru monometallic catalysts and Ru-Re bimetallic catalysts were characterized by N 2 adsorption/desorption, XRD, TEM-EDX, H 2 -TPR and CO chemisorption for obtaining some physicochemical properties of the catalysts, such as specific surface areas, crystal phases, morphologies/microstructure, reduction behaviors and dispersion of Ru metal. The results of XRD and CO chemisorption indicate that the addition of Re component could improve the dispersion of Ru species on supports. The measurements of H 2 -TPR revealed that the coexistence of Re and Ru components on supports changed the respective reduction behavior of Re or Ru alone on the supports, indicating the existence of synergistic effect between Ru and Re species on the bimetallic catalysts. The hydrogenolysis of some products (such as 1,2-propanediol, 1,3-propanediol, 1-propanol and 2-propanol) were also examined over Ru and Ru-Re catalysts for evaluating influence of Re-Re on the reaction routes during glycerol hydrogenolysis. The results showed that over Ru-Re catalysts, glycerol was favorable to be converted to 1,2-propanediol, but not favorable to ethylene glycol, while 1,2-propanediol and 1,3-propanediol were favorable to be converted to 1-propanol. The influence of glycerol concentration in its aqueous solution on the catalytic performance was also evaluated over Ru and Ru-Re catalysts.

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Surface modified bimetallic catalysts: Preparation, characterization, and applications

Cited by 40 publications

References 24 publications

Pure H2 Production by Decomposition of Methane Over Ni Supported on Hydroxyapatite Catalysts

Pure H2 Production by Decomposition of Methane Over Ni Supported on Hydroxyapatite Catalysts

Production of COX Free Hydrogen by Catalytic Decomposition of Methane Over Ni/HY Catalysts

Hydrogenolysis of Glycerol to Propanediols Over Highly Active Ru–Re Bimetallic Catalysts

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