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- 저자 : Guanjie Mi (검색결과 2 건)
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Jianwei Li,Guanjie Mi,Jie Zhang,Biaohua Chen 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
Based on the information from GC-MS on-line measurement and thermodynamic analysis, the reaction network of gas-phase hydroxylation of benzene with nitrous oxide over Fe-ZSM-5 zeolite was systematically investigated. The main reactions and side reactions were identified, and a kinetic reaction network was proposed as follows:benzene+N2O→phenol→CO/CO2. According to the mechanism, the experimental results were interpreted reasonably. The hydroxylation kinetic experiments were carried out in an isothermal integral microreactor under the conditions of n(benzene)/n(N2O)=8-12, T=663-763 K and atmospheric pressure. Based on the reaction network proposed, the parameters in the rate model of power-law were estimated by means of Gauss-Newton optimal method with the Levenberg-Marquardt modifications, and the results were in good agreement with the experimental data.
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Lixia Zou,Qingcheng Liu,Qiong Xu,Guanjie Mi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.5
Mesostructured tungstic acid was prepared from Na_2WO_4 with protonated cation-exchange using a surfactant cetyltrimethyl ammonium bromine (CTAB) as the structure-directing agent under microwave radiation. The surfactant was removed by high-temperature calcination, microwave radiation extraction and Soxhlet extraction, respectively. The effects of these methods for removal of the surfactant were investigated in detail. XRD, TEM, FT-IR and UV-Vis were employed to characterize the mesostructured materials. The results showed that the microwave extraction and Soxhlet extraction were favorable to the synthesis of mesostructured tungstic oxide. Mesoporous structure was destroyed as the calcining temperature rising to 823 K. The mesoporous structure of WO_3 prepared by microwave radiation extraction had an average pore diameter of 3.4 nm and specific surface area of 120.46m^2·g^(−1). And also, the mesoporous materials WO_3 doping with Bi_2O_3 displayed much higher photocatalytic activity than commercial Degussa P25 TiO_2under visible light and UV irradiation.
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