Pd and /or Cu - La2O3/SiO2 catalysts were prepared by Pd and/or Cu supported on La2O3/SiO2 with impregnation The capacities of catalysts reduction and the performance of reaction were studied by H2-TPR and hydrogenati...Pd and /or Cu - La2O3/SiO2 catalysts were prepared by Pd and/or Cu supported on La2O3/SiO2 with impregnation The capacities of catalysts reduction and the performance of reaction were studied by H2-TPR and hydrogenation of CO2 The results of H2-TPR indicate that increasing the content of CuO is advantageous to the reduction of high dispersing CuO, but adding La2O3 hinder the reduction of high dispersing CuO It was found that Pd-Cu alloy formed while Pd, Cu impregnated on La2O3/SiO2 The results of hydrogenation of CO2 indicate that CO2 conversion is promoted by adding La2O3 increasing the content of CuO The thermal stablity of methanol formation was improved by adding La2O3 Aldehyde can be obtained when Pd-Cu were used as active components, and the production of methanol was related to the content of Pd loaded on the展开更多
Based on PVP(polyvinylpyrrolidone) supported bimetallic Pd Cu and silica gel function allied by PEG 600 (polyethylene glycol, average relative molecular mass 600), a novel dually supported bimetallic catalyst, PVP PdC...Based on PVP(polyvinylpyrrolidone) supported bimetallic Pd Cu and silica gel function allied by PEG 600 (polyethylene glycol, average relative molecular mass 600), a novel dually supported bimetallic catalyst, PVP PdCl 2 CuCl 2/SiO 2 PEG600, was prepared, and the bimetallic molar ratio and the pH of reaction medium had a great influence on catalytic activity of the catalyst for dechlorination of aromatic chlorides. It was shown that the catalyst had high activity and selectivity in water phase and could be easily separated and reused. The catalyst could be reused for six times with the reactant conversion over 70%. The catalyst was characterized and the effect of each component of the catalyst was discussed. The bimetallic synergic effect of Pd and Cu accelerated the dechlorination, and the coordination of PVP with metal made metal monodisperse on the catalyst surface. PEG not only was used as phase transfer catalyst, but also was coordinated with metal, making the catalyst in spherical shape and its specfic surface area increasing.展开更多
文摘Pd and /or Cu - La2O3/SiO2 catalysts were prepared by Pd and/or Cu supported on La2O3/SiO2 with impregnation The capacities of catalysts reduction and the performance of reaction were studied by H2-TPR and hydrogenation of CO2 The results of H2-TPR indicate that increasing the content of CuO is advantageous to the reduction of high dispersing CuO, but adding La2O3 hinder the reduction of high dispersing CuO It was found that Pd-Cu alloy formed while Pd, Cu impregnated on La2O3/SiO2 The results of hydrogenation of CO2 indicate that CO2 conversion is promoted by adding La2O3 increasing the content of CuO The thermal stablity of methanol formation was improved by adding La2O3 Aldehyde can be obtained when Pd-Cu were used as active components, and the production of methanol was related to the content of Pd loaded on the
文摘Based on PVP(polyvinylpyrrolidone) supported bimetallic Pd Cu and silica gel function allied by PEG 600 (polyethylene glycol, average relative molecular mass 600), a novel dually supported bimetallic catalyst, PVP PdCl 2 CuCl 2/SiO 2 PEG600, was prepared, and the bimetallic molar ratio and the pH of reaction medium had a great influence on catalytic activity of the catalyst for dechlorination of aromatic chlorides. It was shown that the catalyst had high activity and selectivity in water phase and could be easily separated and reused. The catalyst could be reused for six times with the reactant conversion over 70%. The catalyst was characterized and the effect of each component of the catalyst was discussed. The bimetallic synergic effect of Pd and Cu accelerated the dechlorination, and the coordination of PVP with metal made metal monodisperse on the catalyst surface. PEG not only was used as phase transfer catalyst, but also was coordinated with metal, making the catalyst in spherical shape and its specfic surface area increasing.
