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1. Effect of Promoter MgO on CeO2/Al2O3 Oxygen Carrier Used in Partial Oxidation of Methane to Syngas | |||
liu mingchun,Wang Hua,Wei Yonggang,Li Kongzhai | |||
Chemical Engineering 21 December 2007 | |||
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Abstract:Promoter MgO on 10%CeO2/Al2O3 oxygen carrier was investigated for direct partial oxidation of methane to syngas in molten salt. The contents of 0.5%, 1%, 2%, 3% and 4%MgO on the 10%CeO2/ Al2O3 oxygen carriers in experiments were prepared at the temperature of 750℃, respectively. The methane conversion, H2 and CO selectivity were measured on these prepared oxygen carriers at different reaction temperatures. The results showed that the 3% MgO on 10%CeO2/Al2O3 had the best activity, and the CH4 conversion and CO selectivity reached 92.58% and 87.64% at 875℃, respectively. The effect of different preparation temperatures on 3% MgO as promoter on 10%CeO2/Al2O3 oxygen carrier was investigated. The results of BET indicated that 3% MgO as promoter had the largest surface area at 750℃, and the results also indicated that (and)the higher calcined temperature had a negative effect on oxygen carrier activity. | |||
TO cite this article:liu mingchun,Wang Hua,Wei Yonggang, et al. Effect of Promoter MgO on CeO2/Al2O3 Oxygen Carrier Used in Partial Oxidation of Methane to Syngas[OL].[21 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17224 |
2. Asymmetric Synthesis of (R)-2-trimethylsilyl-2-hydroxyl- propionitrile by (R)-oxynitrilase from Prunus Japonica | |||
Wu Hong,Zong Minhua,Huang Shunrong | |||
Chemical Engineering 23 October 2006 | |||
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Abstract:Optically active silicon containing cyanohydrin: (R)-2-trimethylsilyl-2-hydroxyl- propionitrile was successfully synthesized by asymmetric transcyanation of acetyltrimethylsilane with acetone cyanohydrin in an aqueous/organic biphasic system catalyzed with (R)-oxynitrilase from defatted Prunus Japonica seed meal. Various influential variables were examined for better understanding of the reaction. Diisopropyl ether was found to be the best organic phase for the reaction among all the organic solvents explored. The optimum concentrations of acetyltrimethylsilane and acetone cyanohydrin, volume ratio of aqueous phase to organic phase, buffer pH value and the reaction temperature were 14 mmol ∙ L–1, 28 mmol ∙ L–1, 13% (by volume), 5.0 and 30 oC, respectively. Under the above optimal conditions, the initial reaction rate, the substrate conversion and the product enantiomeric excess were 1.34 mmol∙L–1 ∙ h–1, 99.0% and 99.0%, respectively. | |||
TO cite this article:Wu Hong,Zong Minhua,Huang Shunrong. Asymmetric Synthesis of (R)-2-trimethylsilyl-2-hydroxyl- propionitrile by (R)-oxynitrilase from Prunus Japonica [OL].[23 October 2006] http://en.paper.edu.cn/en_releasepaper/content/8912 |
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