| dc.description.abstract | With recent industrialization, the rapid increase in fossil fuel use has led to rising greenhouse gas emissions, particularly CO2, causing global warming and climate change. This study presents a new dual-functional material (DFMs) that combines an adsorbent and a catalyst to capture and convert CO2 into synthetic natural gas (SNG). The DFMs chemical properties allow for easy CO2 adsorption. Hydrogen gas from renewable sources is introduced to convert the adsorbed CO2 into SNG.
The study focuses on preparing DFMs and analyzing their surface properties using SEM/EDS, mapping, BET, XRD, and ICP. The reaction performance is assessed using a thermogravimetric analyzer and a fixed-bed reactor/gas chromatograph. Using Zeolite-Y as a support and impregnating it with 5%MgO increased its stable average CO2 adsorption capacity to 4.02*10-2 mmole CO2/g, approximately 9.83% higher than pure Zeolite-Y. Further impregnation with 10% and 20% catalysts increased the stable average CO2 adsorption capacity to 4.05*10-2 mmole CO2/g and 4.63*10-2 mmole CO2/g, representing increases of approximately 0.75% and 15.17% compared to 5%MgO/Zeolite-Y. Specifically, the 5% MgO/Zeolite-Y with a 10%Ni catalyst showed a slight increase in adsorption capacity by 0.75%, but with a 20% Ni catalyst, the capacity significantly increased by 15.17%.
In methanation reaction tests, the 20%Ni-5%MgO/Zeolite-Y showed the best performance at 320°C, with a CO2 conversion rate of 99.52%, methane selectivity of 83.63%, and a methane yield of 7.13%. Under the same conditions, the 10%Ni-5%MgO/Zeolite-Y achieved a methane yield of 12.01%. Overall, the 20%Ni-5%MgO/Y-type zeolite is the most promising dual-functional material combination. | en_US |