Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis
Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis
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DOI：
10.1016/j.cej.2010.07.046
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发表时间：
2010-09
影响因子：
15.1
通讯作者：
Chang Liu;Yongchun Liu;Qingxin Ma;Hong He
中科院分区：
文献类型：
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作者：
Chang Liu;Yongchun Liu;Qingxin Ma;Hong He
以铝溶胶为前驱体，在不使用结构导向剂的情况下，通过喷雾热分解制备了过渡型介孔氧化铝。所制备的氧化铝具有较窄的孔径分布（3.0-4.7nm）和良好的介孔结构。制备温度对氧化铝的相形成和孔隙率起主要作用。在800和1200°C下，分别观察到勃姆石向γ-Al_2O_3和θ-Al_2O_3的相变。制备温度的升高导致比表面积和孔体积的减小以及孔径的增大。延长停留时间可以有效促进氧化铝的结晶度，但同时也会导致氧化铝颗粒的比表面积变小、孔容变小、孔径变大、孔径分布变宽。此外，虽然alumisol浓度对表面积的影响不大，但其降低导致孔体积和孔径的减小，并导致形成双峰孔径分布。所制备的氧化铝还具有良好的热稳定性，显示出巨大的工业应用潜力。
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 (3.0–4.7nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to γ-Al2O3and θ-Al2O3was 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.