A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Abstract

a b s t r a c tNovel Ni-W-Mg mixed oxide catalysts (NiWMgO x ) were prepared by homogeneous precipitation and attempted for the methanation of CO 2 . Adding W remarkably promoted the activity with improved stability, anti-CO-poisoning ability and resistance against coke formation compared to the undoped NiMgO x catalyst. The superior reactivity of monodentate formate towards hydrogenation than that of bidentate formate species was identified by DRIFTS analysis and the formation of more active monodentate formate species was indisputably facilitated by W additives, leading to the greatly enhanced catalytic activity. H 2 -TPR and CO 2 -TPD characterization showed that doping W increased the number of stable CO 2 adsorption sites and helped in anchoring the Ni sites as a result of strengthened Ni-Mg interaction, both of which were responsible for the enhanced CO 2 methanation activity and the improved resistance against sintering.

Supported Catalysts for CO2 Methanation: A Review

“…However, they do not show innovative properties as supports for Ni catalyst because the catalytic performance of Ni-CNT is high only in the initial stage of reaction but decreases over time. As occurs for other supports, on introducing ceria on the CNTs surface the catalyst activity and stability increase, due to the promoting effect of ceria on nickel species dispersion and their reduction [195].…”

“…Recently, a synergic effect between Ni and a W-Mg mixed oxide has been reported by Yan et al [195]. The researchers studied a series of W-doped Ni-Mg mixed oxide catalysts in CO 2 methanation, demonstrating their excellent activity, CH 4 selectivity, and stability up to 450 • C. Particularly, the maximum CO 2 conversion is attained when the W:Ni molar ratio in the final catalyst is 1:1.…”

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

“…Ni and noble metals like Ru, Pd and Rh, are reported to be the effective towards CO 2 methanation [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Ni-based catalysts are preferred as promising catalysts for this reaction due to [21][22][23].…”

γ-Alumina-Supported Ni-Mo Carbides as Promising Catalysts for CO<sub>2</sub> Methanation

“…Among the different processes, CO 2 methanation, i.e. its hydrogenation to form CH 4 , stands as a very promising technology, which also offers a solution for off-peak renewable energy storage [2]. Though thermodynamically feasible even at ambient temperature, CO 2 methanation is considerably hindered by its extremely slow reaction kinetics.…”