Controllable preparation of γ-alumina nanoparticles with bimodal pore size distribution in membrane dispersion microreactor

被引:15
|
作者
Yang, Lufan [1 ]
Guo, Mingzhao [1 ]
Zhang, Fan [1 ]
Jing, Yu [1 ]
Wang, Yujun [1 ]
Luo, Guangsheng [1 ]
机构
[1] Tsinghua Univ, State Key Lab Chem Engn, Dept Chem Engn, Beijing 100084, Peoples R China
来源
PARTICUOLOGY | 2018年 / 41卷
关键词
gamma-Al2O3; Bimodal pore size distribution; Ammonium aluminum carbonate hydroxide; Membrane dispersion microreactor; Precipitation; Ammonium bicarbonate;
D O I
10.1016/j.partic.2018.04.001
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this paper, we present a new method for preparing gamma-alumina nanoparticles with a bimodal pore size distribution by using an efficiently mixing membrane dispersion microreactor. NF4HCO3 and Al-2(SO4)(3 center dot)18H(2)O were reacted under vigorous mixing to give an ammonium aluminum carbonate hydroxide (AACH) precursor. gamma-Alumina was obtained by calcination of AACH at 550 degrees C for 6 h. The effects of NH4HCO3 concentration, pH during aging, and reaction temperature were investigated. The mechanism of bimodal pore formation was clarified. The results showed that large pores (10-100 nm) were mainly formed in the reactor and during aging, and small pores (0-10 nm) were mainly formed during calcination. When the concentration of NH4HCO3 was 1.5 mol/L, the aging pH was 9.2, and the reaction temperature was 80 degrees C, gamma-alumina with a specific surface area of 504.7 m(2)/g and pore volume of 1.76 mL/g was obtained. The average size of the large pores was about 30 nm, and the average size of the small pores was about 4 nm. (C) 2018 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.
引用
收藏
页码:1 / 10
页数:10
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