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Preparation of Uniform γ-Alumina Microspheres with Large Pore Volumes in a Coaxial Microchannel
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-17 , DOI: 10.1021/acs.iecr.8b02323 Yanchun Wan 1 , Huilin Yi 1 , Yujun Wang 1 , Guangsheng Luo 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-17 , DOI: 10.1021/acs.iecr.8b02323 Yanchun Wan 1 , Huilin Yi 1 , Yujun Wang 1 , Guangsheng Luo 1
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A novel and effective method is proposed to prepare uniform γ-alumina microspheres with large pore volumes using a coaxial microchannel. In this process, the so-called “temperature/pH-induced gelation” method, in which methylcellulose (MC) and hexamethylenetetramine (HMTA) are added to accelerate gelation of Al(OH)3 sol, is combined with microfluidics technology to ensure sphericity and dimensional homogeneity of the prepared microspheres. The influences of the sol concentration, the properties of pseudoboehmite (PB) used to obtain the sol, and the two-phase flow rates were investigated. By controlling the sol concentration at 10 wt % and the continuous to dispersed phase flow ratio at 14–50, 750–380-μm-diameter γ-alumina microspheres with uniform pore structures were synthesized using an Al(OH)3 sol obtained from PB3. The pore volume was 1.20 mL/g, and the crushing strengths were 8.19–16.67 N/mm2. Prepared at the maximum two-phase flow ratio, sample S9 exhibited the most uniform particle size of about 380 μm.
中文翻译：
同轴微通道中大孔体积均匀γ-氧化铝微球的制备
提出了一种新颖有效的方法，利用同轴微通道制备具有大孔体积的均匀γ-氧化铝微球。在此过程中，将所谓的“温度/ pH诱导胶凝”方法与微流控技术相结合，在该方法中，添加了甲基纤维素（MC）和六亚甲基四胺（HMTA）以加速Al（OH）3溶胶的胶凝。制备的微球的尺寸均匀性。研究了溶胶浓度，用于获得溶胶的假勃姆石（PB）的性能以及两相流速的影响。通过将溶胶浓度控制在10 wt％，将连续相与分散相的流量比控制在14-50，使用Al（OH）3合成了孔径均匀的750-380μm直径的γ-氧化铝微球从PB3获得的溶胶。孔体积为1.20 mL / g，抗碎强度为8.19–16.67 N / mm 2。以最大的两相流动比制备，样品S9表现出最均匀的粒径，约为380μm。
更新日期：2018-08-18
中文翻译：
同轴微通道中大孔体积均匀γ-氧化铝微球的制备
提出了一种新颖有效的方法，利用同轴微通道制备具有大孔体积的均匀γ-氧化铝微球。在此过程中，将所谓的“温度/ pH诱导胶凝”方法与微流控技术相结合，在该方法中，添加了甲基纤维素（MC）和六亚甲基四胺（HMTA）以加速Al（OH）3溶胶的胶凝。制备的微球的尺寸均匀性。研究了溶胶浓度，用于获得溶胶的假勃姆石（PB）的性能以及两相流速的影响。通过将溶胶浓度控制在10 wt％，将连续相与分散相的流量比控制在14-50，使用Al（OH）3合成了孔径均匀的750-380μm直径的γ-氧化铝微球从PB3获得的溶胶。孔体积为1.20 mL / g，抗碎强度为8.19–16.67 N / mm 2。以最大的两相流动比制备，样品S9表现出最均匀的粒径，约为380μm。
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