• Wensheng Ning

      Articles written in Journal of Chemical Sciences

    • The study of the relationship between pore structure and photocatalysis of mesoporous TiO2

      Bing Guo Hangyan Shen Kangying Shu Yaowu Zeng Wensheng Ning

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      Mesoporous titania was synthesized by a sol-gel method using the surfactants Span85 and X114 as the template. The pore structure was determined by the N2 adsorption/desorption method below 73 K and calculated using the BJH model. TEM characterizations show that the pores are formed through particle accumulation. Two kinds of channels, straight channels made of cylindrical capillaries and curved channels made of slit-shaped pores, exist in the bulk materials. The influence of the pore structure of mesoporous TiO2 on its photocatalytic performance was studied. The sample with higher porosity, better textural properties and straight channels are good for photocatalytic performance.

    • Influence of sugars in preparing improved FeAl catalyst for carbon dioxide hydrogenation

      WENSHENG NING BEI LI HUI DAI SHIYE HU XIAZHEN YANG BIAO WANG BO ZHANG

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      The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO2 hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation. During this step, three methods were used to add sucrose intothe precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO2 conversion and C5+ hydrocarbon selectivity by sucrose addition were attributed to the formation of c-Fe2O3 phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in c-Fe2O3 phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate.The formation of c-Fe2O3 phase was explained based on the results of XRD and XPS. The best catalyst possessed CO2 conversion of 30.3% and C5+ selectivity of 52.2% under the reaction conditions of H2-:CO2 = 3:1, 6.0 L/(h.g-cat), 1.6 MPa and 235 °C.

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