Hongmanorom, P.; Ashok, J.; Zhang, G. H.; Bian, Z. F.; Wai, M. H.; Zeng, Y. Q.; Xi, S. B.; Borgna, A.; Kawi, S., Enhanced performance and selectivity of CO2 methanation over phyllosilicate structure derived Ni-Mg/SBA-15 catalysts. Applied Catalysis B: Environmental 2021, 282, Article no.: 119564, DOI: 10.1016/j.apcatb.2020.119564.
Abstract:
Ni and Ni-Mg phyllosilicate mesoporous SBA-15 catalysts were successfully prepared via ammonia evaporation (AE) method as evidenced by XRD, H2-TPR, TEM, FTIR and EXAFS fitting results. The catalysts derived from phyllosilicate structure exhibit superior catalytic performance in CO2 methanation as compared to catalyst prepared via wetness impregnation (WI) method due to enhanced metal-support interaction and the presence of weakly basic sites provided by surface hydroxyl groups. Incorporation of Mg into phyllosilicate structure with optimum 5 wt% is also found to increase medium basic sites, which can promote monodentate formate formation as identified by DRIFTS analysis and improve CO2 methanation activity at lower temperatures. Additionally, the turnover frequency of CO2 conversion can be well correlated with the concentration of basic sites. The strong metal-support interaction derived from phyllosilicate structure along with confinement effect of SBA-15 can suppress metal sintering, resulting in good stability.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the National University of Singapore and National Environment Agency of Singapore - NEA-ETRP Grant
Grant Reference no. : NEA-ETRP Grant 1501 103, WBS No. R-279-000-491-279
This research / project is supported by the Agency for Science, Technology and Research - AME-IRG
Grant Reference no. : AME-IRG A1783c0016, WBS No. R-279-000-509- 305
This research / project is supported by the Ministry of Education - Ministry of Education
Grant Reference no. : MOE 2017-T2-2-130, WBS No. R-279-000-544-112
This research / project is supported by the National Natural Science Foundation of China - NIL
Grant Reference no. : 21902019