La promoted hydrotalcite derived Ni-based catalysts:In situ preparation and CO2 methanation performance
The Ni-La/Al2O3 catalysts derived from hydrotalcite were prepared by an in-situ growth method and applied in CO2 methanation to investigate the influence of La doping amount on the morphology,structure,and catalytic performance of the catalysts.The morphology and structure of the obtained catalysts were analyzed by inductively-coupled plasma emission spectroscopy,X-ray diffraction,H2 temperature programmed reduction,low-temperature N2 adsorption-desorption,scanning electron microscopy,and transmission electron microscopy,respec-tively.The characterization results indicated that an appropriate amount of La doping could improve the dispersion of active metal Ni on the support,weaken the interaction between Ni and the support,improve the pore structure of the catalyst,and increase the specific surface area of the catalyst.The results of CO2 methanation showed that the catalyst 30Ni-10La/Al2O3 with the Ni loading(mass fraction)of 30％and La doping of 10％possessed the outstand-ing catalytic performance,which exhibited the CO2 conversion of 91.9％and CH4 yield of 91.5％under 350 ℃.Moreover,the catalyst 30Ni-10La/Al2O3 remained highly active after the stability test of 60 h.
CO2 methanationhydrotalcite derived catalystLa dopinghigh dispersion
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