Abstract
Effect of nickel loading in nickel catalysts supported on nanocrystalline MgO prepared by surfactant assisted precipitation (M1) method were evaluated in reverse water gas shift (RWGS) reaction. Due to high nickel dispersion and basicity of support 7% Ni showed highest CO2 conversion and good CO selectivity. Increase of nickel loading higher than 7% was in favor of methanation. The 7% Ni was also supported on MgO prepared by ultrasonic assisted precipitation method (M2). The 7Ni-M2 showed higher CO2 conversion but lower CO selectivity in comparison with 7Ni-M1. The supports and catalysts were charactrized by X-ray diffraction (XRD), N2 adsorption-desorption (BET), temperature programmed reduction (TPR) and scanning electron microscopy (SEM) techniques. The BET results revealed narrower pore size distribution and smaller total pore volume for M2 support and 7Ni-M2 catalyst. 7Ni-M1 showed great catalytic stability after 50 h on stream at 600 °C. The results also showed that increase in H2/CO2 molar ratio enhanced the CO2 conversion but decreased the CO selectivity.
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