摘要
运用低温氮物理吸附、X射线衍射、元素分析和差热分析等手段,研究了在制奋氢氧化铝沉淀时控制反应条件(pH、温度等),加入碳酸铵参加共沉淀而制备的γ-Al_2O_3表面结构的变化规律,从而达到能控制其间隙孔大小的目的。最可几孔径控制范围为2—24nm,孔客为0.3—0.7cm^3/g,比表面为120—270m^2/g。
This paper describes the method for making γ-alumina, which uses ammonium carbonate as precipitant in the preparation of aluminum hydroxide gel. After the precipitation is aged at 110℃ for 24 h, it is calcined in air at required temperature for 10 h. Also this paper studies the effect that pH, temperature and concentrition of ammonium carbonate affects the surface structure of γ-alumina by nituogen sorption at 77 K, X-ray diffraction, elemental analysis and differential thermal analysis. The maxima in the pore size distribution of the γ-alumina can be controlled within the range of 2-24nm, the surface area within 120～270 m^2/g range, the pore volume within0.3～0.7cm^3/g range.
关键词
Γ-氧化铝
制备
间隙孔
孔径分布
控制
催化剂
γ-alumina, preparation, mesopore, pore size distribution, specific surface area
