CuO-ZnO-γ-Al_2O_3催化剂的制备及应用
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摘要
采用液相沉淀包覆法制备了以γ-Al2O3为核相的CuO-ZnO-γ-Al2O3复合催化剂,考察了不同制备方法对复合催化剂结构性质的影响。采用X射线衍射(XRD)、CO2程序升温脱附(CO2-TPD)和N2吸附脱附(BET)等手段对几种复合催化剂进行了分析表征。结果表明,制备方法对复合催化剂物化性质影响较大。采用传统共沉淀法制得的复合催化剂γ-Al2O3结晶度,比表面积及表面碱性均较低,而采用液相沉淀包覆法制得的复合催化剂γ-Al2O3结晶度较好,具有较大的比表面积和总碱量。
The CuO-ZnO-γ-Al2 O3 composite catalyst with γ-Al2 O3 as the core phase was prepared by liquid precipitation coating method, and effect of various preparation methods on the physicochemical properties of composite catalyst was investigated in this paper. These obtained products were extensively characterized by X-ray diffraction(XRD), CO2 temperature programmed desorption(CO2-TPD) and N2 adsorption desorption(BET) techniques. The results indicated that various preparation methods posed significant impact on the physicochemical properties of composite catalyst. The crystallinity of γ-Al2 O3, specific surface area and surface alkalinity of the composite catalyst prepared by the traditional coprecipitation method are lower, while the composite catalyst prepared by liquid precipitation coating method has a better crystallinity of γ-Al2 O3, large specific surface area(70.81 m2·g-1) and total alkali content(0.013 mmol·g-1).
The CuO-ZnO-γ-Al2 O3 composite catalyst with γ-Al2 O3 as the core phase was prepared by liquid precipitation coating method, and effect of various preparation methods on the physicochemical properties of composite catalyst was investigated in this paper. These obtained products were extensively characterized by X-ray diffraction(XRD), CO2 temperature programmed desorption(CO2-TPD) and N2 adsorption desorption(BET) techniques. The results indicated that various preparation methods posed significant impact on the physicochemical properties of composite catalyst. The crystallinity of γ-Al2 O3, specific surface area and surface alkalinity of the composite catalyst prepared by the traditional coprecipitation method are lower, while the composite catalyst prepared by liquid precipitation coating method has a better crystallinity of γ-Al2 O3, large specific surface area(70.81 m2·g-1) and total alkali content(0.013 mmol·g-1).
引文
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