热油柱法制备毫米级大孔氧化铝小球研究

PREPARATION OF MILLIMETER-SIZED MACRO-POROUS ALUMINA SPHEREBY HOT OIL-DROP METHOD

针对现有工艺制备的毫米级氧化铝小球微孔多、孔体积小、负载活性组分反应后积炭高等问题,研究了将SB粉与铝溶胶作用,经热油柱成型制备毫米级氧化铝小球方案的可行性,通过优化SB粉铝溶胶质量比、铝溶胶铝氯质量比、老化温度与时间,所制备的氧化铝小球压碎强度高于55 N粒,堆密度为0.56~0.60 g/mL,孔体积大于0.75 mL/g,经650℃、10%水蒸气老化处理48 h,比表面积维持在155 m^(2)/g以上。物化性能分析结果表明,制备的氧化铝小球可作为连续重整催化剂的载体。

In order to solve the problems of the high micro-pore proportion,small pore volume of the present millimeter-size alumina sphere and high carbon deposition rate of the supported catalyst prepared by the existing process,the feasibility of preparing millimeter-sized alumina sphere using SB powder and alumina sol by hot oil-drop method was investigated.By optimizing the ratios of SB powder to alumina sol,mass ratio of aluminum to chloride in alumina sol,aging temperature,and aging time,the crushing strength of the prepared alumina pellets was higher than 55 N pellet,the bulk density was 0.56-0.60 g/mL,the pore volume was higher than 0.75 mL/g,and the specific surface area was maintained above 155 m^(2)/g after being treated with 650℃and 10%water vapor for 48 h.The results of physicochemical analysis showed that the alumina pellet could be used as the support of continuous catalytic reforming catalyst.