Alkaline-promoted Ni based ordered mesoporous catalysts with enhanced low-temperature catalytic activity toward CO₂ methanation

Abstract

Mg alkaline-promoted Ni ordered mesoporous catalysts possess enhanced catalytic activities and stabilities toward CO2 methanation due to decreasing CO2 activation energy.

Magnesium as Promoter of CO2 Methanation on Ni-Based USY Zeolites

“…The main metals used are nickel and noble metals such as Rh and Ru. It was also reported in the literature [7][8][9][10][11][12][13][14] the beneficial effects of the presence of MgO on catalysts used in CO2 or CO methanation, due to the formation of highly dispersed active metal particles 9,10,15 . In addition, it was proposed a mechanism in which CO2 is preferentially adsorbed on MgO and reduced metals are needed for the supply of H atoms 7,8 .…”

Enhanced Catalytic Activity of Iron‐Promoted Nickel on γ‐Al2O3 Nanosheets for Carbon Dioxide Methanation

“…Them ixture was then transferred to a1 50 mL Te flon-lined autoclave and heated at 150 8Cf or 5hagain. After cooling,t he solid was recovered by centrifugation, dried overnight, and then calcined at 500 8Cf or 3h in the air with ar amp of 2 8Cmin À1 .T he samples 25…”

“…Modification of the support and incorporation of a second metal promote the CO 2 conversion performance, but long‐term stability is still often an issue. Recently, other types of materials with enhanced catalytic performance have also been reported . Given the strong dependence of the catalytic activity on active sites exposure, it is believed that different morphologies of the catalysts will differently contribute to the geometrical exposure of active sites .…”

“…Modification of the support [14][15][16][17] and incorporation of as econd metal [18][19][20][21][22] promotet he CO 2 conversion performance,b ut long-term stability is still often an issue.R ecently,o ther types of materials with enhanced catalytic performance have also been reported. [23][24][25][26] Given the strong dependence of the catalytic activity on active sites exposure,iti sbelieved that different morphologies of the catalysts will differently contribute to the geometricale xposure of active sites. [27][28][29][30] Despite its crucialr ole in catalysis,t he effect of catalyst morphology (specifically the geometry and shape of botha ctive metal particles and the support) has so far remained unexplored.…”

Preparation of Ni based mesoporous Al2O3 catalyst with enhanced CO2 methanation performance

“…27 The sol-gel method is applied for the preparation of porous alumina, which results easily in the formation of inhomogeneous porous structure via the cracking of gels. 28 Xu et al 29 developed a onestep evaporation induced self-assembly (EISA) strategy to synthesize the ordered mesoporous alumina material, which presented the strong metal-support interaction and outstanding thermal stability compared to the traditional nonmesoporous Al 2 O 3 support, displaying better catalytic performance. However, low-temperature CO 2 methanation performance is still needed to be improved.…”