The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform

Hideyuki Kambe - One of the best experts on this subject based on the ideXlab platform.

Yuuji Shimasaki - One of the best experts on this subject based on the ideXlab platform.

Guoxing Xiong - One of the best experts on this subject based on the ideXlab platform.

  • Partial oxidation of propane to syngas over nickel supported catalysts modified by Alkali Metal Oxides and rare-earth Metal Oxides
    Applied Catalysis A: General, 2001
    Co-Authors: Shenglin Liu, Sujuan Xie, Qingxia Wang, Guoxing Xiong
    Abstract:

    Abstract The reaction performance, catalyst acidity and basicity property, and carbon-deposition of various nickel-supported catalysts for partial oxidation of propane (POP) to syngas were investigated with a flow-reactor, FTIR, TG and UVRRS analyses. The NiO/γ-Al 2 O 3 catalyst is the most suitable for the POP reaction among NiO/γ-Al 2 O 3 , NiO/MgO and NiO/SiO 2 . And the reaction performance of the NiO/γ-Al 2 O 3 shows little difference from those of the nickel-supported catalysts modified by Alkali Metal Oxides and rare-earth Metal Oxides. However, modification with Alkali Metal Oxide Li 2 O and rare-earth Metal Oxide La 2 O 3 can reduce the Lewis acidity intensity of the NiO/γ-Al 2 O 3 and enhance its ability to suppress carbon-deposition during the POP reaction. The carbon-deposition contains graphite-like species that were detected by UVRRS. The nickel-supported catalysts modified by Alkali Metal Oxides and rare-earth Metal Oxides possess good reaction performance and carbon-deposition resistance.

  • partial oxidation of ethane to syngas over nickel based catalysts modified by Alkali Metal Oxide and rare earth Metal Oxide
    Catalysis Letters, 1999
    Co-Authors: Shenglin Liu, Guoxing Xiong, Weishen Yang, Guang Xiong
    Abstract:

    The catalytic activity, thermal stability and carbon deposition of various modified NiO/γ‐Al2O3 and unmodified NiO/γ‐Al2O3 catalysts were investigated with a flow reactor, XRD, TG and UVRRS analysis. The activity and selectivity of the NiO/γ‐Al2O3 catalyst showed little difference from those of the modified nickel‐based catalysts. However, modification with Alkali Metal Oxide (Li, Na, K) and rare earth Metal Oxide (La, Ce, Y, Sm) can improve the thermal stability of the NiO/γ‐Al2O3 and enhance its ability to suppress carbon deposition during the partial oxidation of ethane (POE). The carbon deposition contains graphite‐like species that were detected by UVRRS. The nickel‐based catalysts modified by Alkali Metal Oxide and rare earth Metal Oxide have excellent catalytic activities (C2H6 conversion of ~100%, CO selectivity of ~94%, 7 × 104 l/(kg h), 1123 K), good thermal stability and carbon‐deposition resistance.

  • partial oxidation of methane to syngas over nickel based catalysts modified by Alkali Metal Oxide and rare earth Metal Oxide
    Applied Catalysis A-general, 1997
    Co-Authors: Qing Miao, Guoxing Xiong, Shishan Sheng, Wei Cui, Xiexian Guo
    Abstract:

    Abstract The NiO/Al2O3 catalyst was modified by Alkali Metal Oxide (Li, Na, K) and rare-earth Metal Oxide (La, Ce, Y, Sm) in order to improve the thermal stability and the carbon-deposition resistance during the partial oxidation of methane to syngas (POM) reaction at high temperature. The reaction performance, thermal stability, structure, dispersity of nickel and carbon-deposition of the modified NiO/Al2O3 catalyst and unmodified NiO/Al2O3 catalyst were investigated by a series of characterization techniques including flow-reaction, BET, XRD, CO chemisorption and TG analysis. The results indicated that the modification with Alkali Metal Oxide and rare-earth Metal Oxide improves the dispersion of active component nickel and the activity for the POM reaction over the nickel-based catalysts, and enhances their thermal stability during high temperature reaction and the ability to suppress the carbon-deposition over the nickel-based catalysts during the POM reaction. The nickel-based catalysts modified by Alkali Metal Oxide and rare-earth Metal Oxide have excellent POM reaction performance (CH4 conversion of 94.8%, CO selectivity of 98.1%, 2.7×104l/kg·h), excellent stability and carbon-deposition resistance.

  • The oxidative transformation of methane over the nickel-based catalysts modified by Alkali Metal Oxide and rare earth Metal Oxide
    11th International Congress On Catalysis - 40th Anniversary Proceedings of the 11th ICC, 1996
    Co-Authors: Qing Miao, Guoxing Xiong, Shishan Sheng, Wei Cui, Xiexian Guo
    Abstract:

    Abstract Two completely different behaviors of the oxidative transformation of methane were performed over the nickel-based catalysts because of the different modifications by Alkali Metal Oxide and rare earth Metal Oxide and the different interactions between nickel and supports, and two types of catalysts, namely the LiNiLaOx catalyst with a good Oxidative Coupling of Methane (OCM) performance and the LiNiLaOx/Al 2 O 3 supported catalyst with an excellent performance of the Partial Oxidation of Methane to Syngas (POM) reaction were obtained. Several techniques, such as flow-reaction, pulse-reaction, XRD, H 2 -TPR, XPS, TPO, and TG, etc., were employed to investigate the relation among the preparation and composition of catalysts, the structures of catalysts and the catalytic performances, especially effects of each component, the active phases and their precursors, the redox behaviors and the states of nickel present in those nickel-based catalysts. The effects of acid-base properties on the states of nickel present and on the directions of the oxidative transformation of methane, the interaction between nickel and other components and the deposition of surface carbon over catalysts were studied. The types of active centers, the modes of the activation of methane and the reaction mechanisms were discussed in detail.

Hitoshi Yano - One of the best experts on this subject based on the ideXlab platform.

Kimio Ariyoshi - One of the best experts on this subject based on the ideXlab platform.