What if zeolite LTA4A and zeolite LTA5A used as Nickel catalyst supports for recycling carbon dioxide to green fuel methane

Commercial zeolite LTA4A and zeolite LTA5A were used as nickel metal catalyst supports for CO2 methanation. The catalysts were prepared by incipient wetness impregnation at %weight ranging from 5 % to 20 %. The catalysts were characterized by means of nitrogen physisorption for BET surface area and adsorption-desorption isotherms, thermogravimetric analysis under H2/N2 flowing mixture gases, time resolved X-ray Absorption Near Edge Structure (XANES) reduction, X-Ray Diffraction, H2 chemisorption, CO2 temperature programmed desorption and NH3 temperature programmed desorption. The morphology and particle size distribution were investigated by SEM and TEM. The catalysts exhibited difference in BET surface area, particle size distribution, and surface chemistry leading to the difference in product selectivity of CO2 hydrogenation (CO2/H2 = 1:4). The catalysts can accelerate the reaction initially at 300 degrees C and it was effective consistently until 500 degrees C. The nickelbased catalyst supported by zeolite LTA5A favored CO2 hydrogenated to methane, whereas others was mostly active for reverse water gas shift reaction. The catalyst at 5% nickel loaded on zeolite LTA gave the highest total CO2 conversion at 400-500 degrees C (72 % and 84 %), whereas 20 %Ni/LTA5A possessed the highest CO2 conversion to methane at 400 degrees C (45 %).

Automated summary

The study investigated the use of commercial zeolite LTA4A and LTA5A as nickel metal catalyst supports for CO2 methanation. The results showed that the catalysts' loading amount significantly affected product selectivity, with the 5% nickel loaded on zeolite LTA showing the highest total CO2 conversion at 400-500 degrees C, while 20%Ni/LTA5A exhibited the highest CO2 conversion to methane at 400 degrees C.