Influence of group VIB metals on activity of the Ni/MgO catalysts for methane decomposition

By Ali Rastegarpanah, M. Rezaei, Fereshteh Meshkani, Kunfeng Zhang, Xingtian Zhao, Wenbo Pei, Yuxi Liu, Jiguang Deng, Hamidreza Arandiyan, H. Dai. Applied Catalysis B: Environmental, 2019

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Abstract Mesoporous 55 wt.% Ni/MgO and group VIB metal (Cr, Mo or W)-doped catalysts were prepared using the facile "one-pot" evaporation-induced self-assembly in ethanol and wetness impregnation methods, respectively. Physicochemical properties of the as-prepared catalysts were characterized by means of the BET, XRD, SEM, TEM, HAADF, XPS, H2-TPR, TPO, and Raman techniques. The doping of Cr to 55 wt% Ni/MgO improved catalytic activity and stability for the decomposition of methane under harsh reaction conditions. The maximal initial methane conversions of 80, 87, and 75% were achieved over the 55 wt.% Ni−xCr/MgO (denoted as 55Ni−xCr/MgO; x = 5, 10, and 15 wt.%) at 675 oC and GHSV = 48,000 mL/(g h), respectively. It is concluded that the high catalytic efficiency of the Cr-doped sample in methane decomposition was associated with its high surface area, high oxygen adspecies concentration, and good low-temperature reducibility. In addition, multi-walled carbon filaments with metal-encapsulated carbon particles were deposited on the Cr-doped catalysts, and the ordered carbon filaments with different diameters and good crystallinity were produced on the surface of the 55Ni−10Cr/MgO catalyst.

Subfields: Catalysis, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/87dcee78704f934f63aa98beaccc3bce0f4baaeb