The promoting effect of Ce in the CO2 methanation performances on NiUSY zeolite: A FTIR In Situ/Operando study

Micro- and mesoporous supports for CO2 methanation catalysts: A comparison between SBA-15, MCM-41 and USY zeolite

“…However, at higher temperature (when the CO2 conversion and the CH4 selectivity are considerably higher) the bands attributed to formates and carbonates species present much lower intensities, indicating that these species reacted to form CH4. Thus, the presence of CeO2 on the different materials studied in this work, as already reported in the literature 19,22 promotes the activation of CO2 even at low temperatures, enhancing the CH4 formation. …”

“…So far, few works have been published dealing with the use of micro and mesoporous materials as supports for Ni-based CO2 and CO methanation catalysts [6][7][8][9][10][11][12][13][14][15][16][17] , the mainly used being USY zeolite, SBA-15 and MCM-41. Ni-based USY zeolite catalysts showed interesting performances towards methanation being reported the effect of Ni content, Ce addition, the preparation method conditions and some highlights concerning the reaction mechanism 6,[17][18][19] . In addition, SBA-15 and MCM-41 mesoporous materials were used due to their large pore sizes and interesting textural properties for the dispersion of metal species and the prevention of sintering processes.…”

Ni‐Ce/Zeolites for CO2 Hydrogenation to CH4: Effect of the Metal Incorporation Order

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a] InÞsG raÅa, [b] JosØ M. Lopes, [a] andC arlosH enriques* [a] Introduction CO 2 methanation, as af orm of alleviating CO 2 emissions, has been the focus of much attention in the last few years, with thermal, photocatalytic,e lectrochemical, or even plasma assisted processes being used. [44][45][46][47][48][49] Amongt he different supports used, zeolitesh ave been revealed to be interesting materials, as their properties (e.g.,S i/ Al ratio, compensating cation) can be easily modified to meet the requirements of the reaction.Ni-basedu ltrastable Yz eolites (USY) have been appliedt o the CO 2 methanation reaction, with very promising results. [44][45][46][47][48][49] Amongt he different supports used, zeolitesh ave been revealed to be interesting materials, as their properties (e.g.,S i/ Al ratio, compensating cation) can be easily modified to meet the requirements of the reaction.

Ni-basedu ltrastable Yz eolites (USY) have been appliedt o the CO 2 methanation reaction, with very promising results.

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“…[1][2][3][4][5][6] Ni and Ru-based materials have been commonly used for this reaction, on different supports, such as Al 2 O 3 , [7][8][9][10][11][12][13][14][15] SiO 2 , [16][17][18][19][20] Ce and Zr oxides, [21][22][23][24][25][26][27][28] hydrotalcites and hydrotalcite-derived materials, [21,[29][30][31][32] carbon nanotubes, [33][34][35][36][37] mesoporous materials, [38][39][40][41][42][43] and zeolites. [44][45][46][47][48][49] In these studies, changes to the metal incorporation method (impregn...…”

“…[44][45][46][47][48][49] In these studies, changes to the metal incorporation method (impregnation or ion-exchange), the preparation conditions, the type of compensating cation, and the Si/Al ratio have been investigated to try to obtain an optimized catalyst formulation. [44][45][46][47][48][49] In these studies, changes to the metal incorporation method (impregnation or ion-exchange), the preparation conditions, the type of compensating cation, and the Si/Al ratio have been investigated to try to obtain an optimized catalyst formulation.…”