Bimetallic Catalyst

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Tiancun Xiao - One of the best experts on this subject based on the ideXlab platform.

  • catalytic performance of pd ni Bimetallic Catalyst for glycerol hydrogenolysis
    Biomass & Bioenergy, 2015
    Co-Authors: Tao Jiang, Qiang Huai, Tong Geng, Weiyong Ying, Tiancun Xiao
    Abstract:

    Abstract Catalytic conversion of glycerol from biodiesel production to value-added chemicals and fuels is actually of great interest for industrial chemical research. Bimetallic Catalysts are confirmed superior to monometallic Catalysts in terms of catalytic activity and selectivity for glycerol hydrogenolysis. Accordingly, a series of Pd–M (M = Fe, Co, Ni, Cu, Zn) Bimetallic Catalysts were prepared in this work via coprecipitation to investigate the promoting effect of Pd. The relationship between the catalytic performance and metal-support interaction was also discussed. Through the Catalyst screening, Pd–Ni Bimetallic Catalyst exhibited moderate activity and the highest selectivity towards ethylene glycol. At 493 K and hydrogen pressure of 6.0 MPa, the glycerol conversion and selectivity of ethylene glycol reached 89% and 22% respectively. XRD and TEM patterns showed that the Pd nanoparticles with an average size of ∼4 nm were uniformly dispersed in the supports. H 2 -TPR revealed that the reduction temperatures of metal oxides were significantly decreased by the introduction of Pd component. XPS curves indicated that unique performance of the Pd–Ni Bimetallic Catalyst might be attributed to the formation of Pd–Ni alloy. And the required metal-support interaction was assumed responsible for the cleavage of C–C bond and generation of ethylene glycol. In the end, hydrogenolysis reactions for the main products of glycerol conversion were carried out over Pd–Ni Catalyst to explore the possible reaction pathways for glycerol hydrogenolysis.

  • hydrogen generation from liquid reforming of glycerin over ni co Bimetallic Catalyst
    Biomass & Bioenergy, 2010
    Co-Authors: Kun Ouyang, Tiancun Xiao
    Abstract:

    Abstract Glycerin is a low cost renewable byproduct of the biodiesel industry, and can be reformed into hydrogen. Here we describe the development of cerium promoted nickel cobalt Catalysts on alumina supports for the liquid phase reforming of aqueous glycerine in subcritical water. The Bimetallic Ni–Co Catalyst was prepared using the urea matrix combustion method over a wide range of compositions both with and without cerium. TPR profiles indicated a synergism between the metals, however, the Catalysts deactivated due to carbon deposition as plaques, and in some compositions due to sintering. Cerium (2Ce–Ni1Co3) suppressed sintering and lowered methane selectivity by comparison with Ni1Co3 alone.

Baldev Singh - One of the best experts on this subject based on the ideXlab platform.

Subhash C Taneja - One of the best experts on this subject based on the ideXlab platform.

Yoichi M A Yamada - One of the best experts on this subject based on the ideXlab platform.

Junyoung Jung - One of the best experts on this subject based on the ideXlab platform.

  • nitrate reduction by maghemite supported cu pd Bimetallic Catalyst
    Applied Catalysis B-environmental, 2012
    Co-Authors: Junyoung Jung
    Abstract:

    Abstract We have investigated the catalytic nitrate reduction by maghemite supported Cu-Pd Bimetallic Catalyst (maghemite/Cu/Pd). BET, XRD, XPS, TPR, SEM/EDX, TEM analysis were carried out to characterize maghemite/Cu/Pd. Remarkable nitrate removal (99.5%) by maghemite/Cu/Pd was observed in 90 min, while Cu-Pd Catalyst supported with alumina (43%) and hematite (63%) showed less efficient nitrate removal. Nitrate removal was excellent (>95%) in all Cu loading variation (0.25–1 wt.%) on maghemite/Cu/Pd, while selectivity of nitrogen gas formed during the reaction was the highest (43%) at a specific Cu/Pd ratio (0.5/0.5 wt.%). We also observed excellent nitrate removals (>95 and >94%, respectively) by maghemite/Cu/Pd in the ranges of Pd loading (0.25–1 wt.%) and hydrogen flow rate (100–500 cc/min). The highest nitrogen selectivities (47 and 45%) were obtained by low Pd loading (0.25 wt.%) and hydrogen flow rate (200 cc/min). Maghemite/Cu/Pd showed slow decrease of nitrate removal (99.5–83%) and low metal leaching (1.5% of Cu leaching) during three reaction cycles. XPS analysis revealed that Cu(0) was oxidized to Cu2O and CuO during the catalytic nitrate reduction, while Pd(0) was not changed.