Durable Ni/MgO catalysts for CO2 reforming of methane: Activity and metal–support interaction

Significantly Improved Catalytic Performance of Ni-Based MgO Catalyst in Steam Reforming of Phenol by Inducing Mesostructure

“…Considering these three factors, we propose a nickel-based catalyst supported on mesoporous MgO could be a promising catalyst. MgO was used because NiO and MgO can form theoretically ideal solid solution in any molar ratio and the strong interaction between them is helpful for preventing Ni particle sintering and the coke deposition [14,15]. Mesoporous MgO instead of commercial MgO was used because the higher specific surface area induced by mesopores favored the dispersion of Ni metal particles and the "confinement effect" of mesopores limited the growth of Ni particles during catalyst preparation and subsequent reaction [16,17].…”

Phase Composition of Ni/Mg1−xNixO as a Catalyst Prepared for Selective Methanation of CO in H2-Rich Gas

“…Calcination at 650 ∘ C or higher is beneficial for formation of the solid solution [2,3]. It is also reported that at calcination temperature of 500 ∘ C the solid solution was formed without or with formation of a minor amount of NiO [4,5].…”

“…Ni 2+ ions in the solid solution are hard to be reduced in comparison to Ni 2+ ions in NiO [2,3,6,7]. In a usual reduction process, only a part of Ni 2+ ions can be reduced from the solid solution, and the Ni crystallites formed in such a way have smaller sizes and are isolatedly distributed on the surface of the remaining solid solution [3,8]. Owing to this unique feature, the solid solution is studied extensively as catalyst precursor for CO 2 reforming reaction of methane these years [8,9].…”

“…It appears that a uniform dispersion of the two kinds of metallic ions in precursor allows the solid solution formed at a lower calcination temperature [6]. Ni 2+ ions in the solid solution are hard to be reduced in comparison to Ni 2+ ions in NiO [2,3,6,7]. In a usual reduction process, only a part of Ni 2+ ions can be reduced from the solid solution, and the Ni crystallites formed in such a way have smaller sizes and are isolatedly distributed on the surface of the remaining solid solution [3,8].…”

“…A small TPR peak appeared in 300 ∘ C∼400 ∘ C for all the four samples, corresponding to reduction of NiO. It is reported that reduction of solid solution Mg 1− Ni O needs a high temperature, largely in 400 ∘ C∼700 ∘ C for reduction of Ni 2+ ions in subsurface layer of the solid solution, at 800 ∘ C and higher for reduction of Ni 2+ ions in the bulk, and also a period of time at the high temperatures is needed for the reduction to be completed due to its low reduction rate [3,7,12]. In order to study influence of calcination temperature on formation of solid solution, higher calcination temperatures of 600 ∘ C and 800 ∘ C were adopted.…”