Obtaining well-dispersed Ni/Al2O3 catalyst for CO2 methanation with a microwave-assisted method

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

“…Promotors (such as MgO, CaO, La 2 O 3 and so on), 15-17 supports (including SiO 2 , Al 2 O 3 , ZrO 2 and CeO 2 ) and reaction conditions (temperature, pressure, space velocity and so on) are extensively adopted to optimize Ni-based catalysts, which play an important role in improving the performance for CO 2 methanation. [18][19][20][21] Especially, the nature of the support has a signicant inuence on the dispersion of active metallic sites and interaction of metal-support. 8 CeO 2 (ref.…”

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

“…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.…”

Microwave, Ultrasound, and Mechanochemistry: Unconventional Tools that Are Used to Obtain “Smart” Catalysts for CO2 Hydrogenation

“…The drying method deeply affected the catalyst performance: in particular, MW-assisted drying The better Ni dispersion obtained by MW joint with a stronger basicity of support (as determined by CO 2 TPD) likely led to enhanced CO 2 methanation activity at lower temperature. The corresponding CH 4 selectivity was also maintained over the whole temperature range (200-400 • C), and the catalyst was rather stable under prolonged (72 h) catalytic tests without appreciable agglomeration of Ni species [47].…”

“…25% more H 2 during TPD analysis. Moreover, MW-assisted synthesis of Ni/Al2O3 catalysts for CO2 methanation [47] resulted in higher Ni dispersion, as well as higher basicity of the support with respect to Ni/Al2O3 catalysts obtained by impregnation. Physico-chemical characterization of the catalysts showed some relevant differences: for instance, Raman spectroscopy revealed a higher amount of NiO oxide in the sample prepared by impregnation, which also showed lower surface area (≅143 m 2 g −1 against 163 m 2 g −1 ).…”