Influence of nickel precursors on the properties and performance of Ni impregnated zeolite 5A and 13X catalysts in CO2 methanation

Zeolite 13X and 5A supported Ni catalysts were synthesized for CO2 methanation using the evaporation impregnation method. The influence of different precursors (nitrate, citrate, acetate) as well calcination temperatures on catalyst properties performance investigated. XRD, SEM-EDX, TEM, STEM-EDX, N2 physisorption, H2-TPR, TPD-NH3 TG/DTA used detailed characterization catalysts. parent structure zeolites did not change during synthesis. Using nickel citrate acetate resulted in smaller NiO particle size compared to nitrate. STEM-EDX results showed that all Ni-precursor complexes entered more efficiently zeolite structure, which is mainly due steric hindrance resulting from pore 5A. Methanation experiments revealed (5% Ni) displayed clearly higher activity, nitrate or acetate. A 79% conversion at 320 °C was obtained with 100% selectivity towards CH4 excellent stability 200 h testing. Overall, it can be concluded precursor significantly influences physico-chemical characteristics catalytic methanation: complex matter.