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Shalini ARORA and Ram PRASAD; Effect of Promoters on Performance of Ni/gama-Al2O3 Catalyst in Dry Reforming of Methane; Advanced NanoMaterials and Technologies for Energy Sector; 2017:1(2):107-121
The effect of various promoters (Ca, Ce, Mg, Zr) on the performance of 3%Ni/g-Al2O3 catalysts in dry reforming of methane was investigated in a quartz tubular reactor under the following conditions: 1:1 CO2/CH4 ratio, flow rate CO2/CH4/Ar = 15/15/3 ml/min, temperature 700oC and at atmospheric pressure. The support,g-Al2O3 was prepared by hydrothermal crystallization of boehmite. Various formulations of the promoted Ni/g-Al2O3 catalysts were synthesized by wet impregnation method followed by drying and calcination at 750oC. The fresh and spent catalysts were characterized by various techniques. The compositions of the reactor inlet and outlet gases were analysed by online gas chromatography. The carbon deposition on the spent catalysts was determined by CHNS analyser. It was observed that the doubly promoted catalyst with Ca-Ce gave the best performance with the least coke deposition. The highest CH4 and CO2 conversion were found to be 72% and 79% with 2.247% carbon deposition for 10 hours of stream on run with this catalyst. Triply promoted (Zr-Ca-Ce) catalyst gave better result than doubly promoted Ca-Ce catalyst in activity but not in stability as well as carbon deposition resistance. Rh addition in doubly promoted Ca-Ce catalyst was also investigated that increased the activity (CH4 conversion 82% and CO2 conversion 96%) and decreased the carbon deposition (1.93%). This is a new formulation of catalyst which has performed very well in DRM process.