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Copper/Nickel/Manganese Doped Cerium Oxides Based Catalysts for Hydrogenation of CO2
Susilawati Toemen,Wan Azelee Wan Abu Bakar,Rusmidah Ali 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
The recycling technology by the catalytic conversion is one of the most promising techniques for the CO2 treatment of coal burning power plant flue gases. The conversion of CO2 to valuable product of CH4 can be used as a fuel to run the turbine for electricity generation. Through this technique, the amount of coal needed for the combustion in a gas turbine can be reduced as well as CO2 emissions. Therefore, a series of catalysts based on cerium oxide doped with copper, nickel and manganese were prepared by impregnation method. From the characterization analysis, it showed that the prepared catalysts calcined at 400 oC were amorphous in structure with small particle size in the range below 100 nm. Meanwhile, the catalyst particles were aggregated and agglomerated with higher surface area of 286.70 m2g−1. By increasing the calcination temperature of catalysts to 1000 oC, the particle sizes were getting bigger (> 100 nm) and having moderate crystallinity with lower surface area (67.90 m2g−1). From the catalytic testing among all the prepared catalysts, Mn/Ce-75/Al2O3 calcined at 400 oC was assigned as the most potential catalyst which gave 49.05% and 56.79% CO2 conversion at reaction temperature of 100 oC and 200 oC, respectively.
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Copper/Nickel/Manganese Doped Cerium Oxides Based Catalysts for Hydrogenation of CO<sub>2</sub>
Toemen, Susilawati,Bakar, Wan Azelee Wan Abu,Ali, Rusmidah Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
The recycling technology by the catalytic conversion is one of the most promising techniques for the $CO_2$ treatment of coal burning power plant flue gases. The conversion of $CO_2$ to valuable product of $CH_4$ can be used as a fuel to run the turbine for electricity generation. Through this technique, the amount of coal needed for the combustion in a gas turbine can be reduced as well as $CO_2$ emissions. Therefore, a series of catalysts based on cerium oxide doped with copper, nickel and manganese were prepared by impregnation method. From the characterization analysis, it showed that the prepared catalysts calcined at $400^{\circ}C$ were amorphous in structure with small particle size in the range below 100 nm. Meanwhile, the catalyst particles were aggregated and agglomerated with higher surface area of $286.70m^2g^{-1}$. By increasing the calcination temperature of catalysts to $1000^{\circ}C$, the particle sizes were getting bigger (> 100 nm) and having moderate crystallinity with lower surface area ($67.90m^2g^{-1}$). From the catalytic testing among all the prepared catalysts, Mn/Ce-75/$Al_2O_3$ calcined at $400^{\circ}C$ was assigned as the most potential catalyst which gave 49.05% and 56.79% $CO_2$ conversion at reaction temperature of $100^{\circ}C$ and $200^{\circ}C$, respectively.
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Wan Nur Aini Wan Mokhtar,Wan Azelee Wan Abu Bakar,Rusmidah Ali,Abdul Aziz Abdul Kadir 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
Systematic experiments were conducted to investigate the most appropriate extraction conditions forsulfur reduction. Initial extraction studies showed that DMF was the most potentially effective solvent. The influence of DMF to diesel ratios, extraction times and temperatures, addition of co-solvent, solventmixtures, double extractions were explored. The use of co-solvent and solvent mixtures showed poorefficiencies of sulfur removal. A two-stage extraction with ratio of 1:1 (DMF/Diesel) was successfullyremoved over 88.0% of sulfur in diesel. Under Box–Behnken design, the model showed that maximumextraction ability was observed at 30 8C, 30 min and 1.0 of DMF/diesel ratio to achieved 67.5%.
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Wan Nazwanie Wan Abdullah,Wan Azelee Wan Abu Bakar,Rusmidah Ali 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
The performance of oxidative desulfurization (ODS) of commercial diesel by alumina supported polymolybdate based catalyst system was studied using tert-butyl hydroperoxide (TBHP) as an oxidizing agent. From catalytic testing, MoO3-Al2O3 calcined at 500 oC was the most potential catalyst which gave the highest sulfur removal under mild condition. The sulfur content in commercial diesel was successfully reduced from 440 ppmw to 105 ppmw followed by solvent extraction. Response surface methodology involving Box-Behnken was employed to evaluate and optimize MoO3/Al2O3 preparation parameters (calcination temperatures, molybdenum loading precursor and catalyst loading), and their optimum values were found to be 510 oC, 0.98 g and 11.18 g/L of calcination temperature, molybdenum loading precursor and catalyst loading, respectively. Based on results, the reaction mechanism for oxidation of sulfur compounds to the corresponding sulfones occur in the presence of MoO3 /Al2O3 catalyst was proposed.
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