介孔材料
勃姆石
化学工程
结晶度
材料科学
多孔性
比表面积
体积热力学
热稳定性
热解
相(物质)
矿物学
复合材料
化学
有机化学
催化作用
铝
量子力学
物理
工程类
作者
Chang Liu,Yongchun Liu,Qingxia Ma,Hong He
标识
DOI:10.1016/j.cej.2010.07.046
摘要
Mesoporous transition alumina was prepared by spray pyrolysis of an alumisol precursor, without the use of structure-directing reagents. The prepared alumina exhibited a well-defined mesoporous structure with narrow pore size distribution (3.0–4.7 nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to γ-Al2O3 and θ-Al2O3 was observed at 800 and 1200 °C, respectively. An increase in preparation temperature resulted in a decrease in surface area and pore volume and an increase in pore size. Longer residence time promoted the crystallinity of prepared alumina effectively, but it also led to the formation of particles with smaller surface area, lower pore volume, larger pore size, and broader pore size distribution. Additionally, while alumisol concentration had little effect on the surface area, its reduction led to a decrease in pore volume and pore size and caused the formation of bimodal pore size distribution. The as-prepared alumina also exhibited excellent thermal stability, showing great application potential for industry.
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