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6072229 
Journal Article 
Investigation of Ru/Mn/Ce/Al2O3 catalyst for carbon dioxide methanation: Catalytic optimization, physicochemical studies and RSM 
Toemen, S; Abu Bakar, W; Ali, R 
2014 
1 
Taiwan Institute of Chemical Engineers. Journal
ISSN: 1876-1070 
Elsevier 
45 
5 
2370-2378 
WOS:000343635200038 
The investigation of Ru/Mn/Ce/Al2O3 catalyst on the ceria loading, calcination temperature and catalyst dosage had significantly affected the catalytic performance. The optimum conditions were achieved over 10g of Ru/Mn/Ce/Al2O3 catalysts calcined at 1000°C with 65 wt% of Ce loading which gave 97.73% CO2 conversion and 91.31% of methane formation at reaction temperature of 200°C. The physicochemical properties investigated by XRD diffractogram showed that the catalyst still having polycrystalline structure with the mixture of Mn4+ and Mn3+ although had being calcined at high temperature of 1000°C. Meanwhile, FESEM analysis indicated a morphology which looks like staghorn coral morphology with the smallest particle size of 86nm and the highest BET surface area of 47.65m2/g. The impact of these three critical parameters was investigated via Box–Behnken experimental design and their optimum values obtained over 10g of Ru/Mn/Ce/Al2O3 catalyst were calcined at 1025°C with Ce loading of 65 wt%. The predicted value given was 98.95% of CO2 conversion which was closely agreed with our experimental result (98.25%) over similar conditions. 
Methanation; Carbon dioxide; Ceria; Physicochemical properties; RSM