高岭土微球原位晶化L沸石的改性-《郑州大学学报(工学版)》

文章信息/Info

作者:: 陈宜俍; 刘琳; 张忠东; 等.; 郑州大学化工学院,河南,郑州,450001, 兰州石化研究院,甘肃,兰州,730000, 平顶山神马工程塑料有限公司,河南,平顶山,467000

Author(s):: CHEN Yiliang; LIU Lin; ZHANG Zhongdong; etc; 1．School of Chemical Engineering，Zhengzhou University，Zhengzhou 450001。China；2．Research Institute of Lanzhou Petrochemical Corporation，Lanzhou 730000，China；3 Shenma Engineering Plastic Company Limited，Pingdingshan 467000．China

Keywords:: kaolin microspheres; L zeolite; ion exchange; roasting; Citric acid treatment

摘要:: 对高岭土微球上合成的L沸石进行改性,降低其氧化钾含量,提高其硅铝比.对离子交换时的硫酸铵量、温度、时间进行了优化,考察了焙烧方式对硅铝比和结晶度的影响,并将离子交换、柠檬酸处理和水蒸气焙烧相结合以提高沸石的硅铝比.结果表明,离子交换时最佳的反应条件为沸石:水:硫酸铵比例为1g:10mL:1g,反应温度80℃,反应时间2h.离子变换结合水蒸气焙烧能有效提高沸石的硅铝比,但产物的结晶度有所降低,焙烧时进行程序井温对结晶度的保持没有效果.离子交换、柠檬酸处理结合水热焙烧能在保持晶体结构完整的同时显著提高沸石的硅铝比,柠檬酸浓度为0.10 mol/L时,三交三柠三焙(E)样品结晶度为82%,硅铝比达到了13.60.

Abstract:: The L zeolite synthesized on kaolin microspheres was modified to reduce its potassium oxide content and improve its silicon-aluminum ratio. The amount, temperature and time of ammonium sulfate during ion exchange were optimized, the effects of roasting on silicon-aluminum ratio and crystallinity were investigated, and ion exchange, citric acid treatment and water vapor roasting were combined to improve the silicon-aluminum ratio of zeolite. The results showed that the optimal reaction conditions during ion exchange were zeolite:water:ammonium sulfate ratio of 1g:10mL:1g, reaction temperature 80 °C, reaction time 2h. Ion exchange, citric acid treatment combined with hydrothermal roasting can significantly improve the silicon-aluminum ratio of zeolite while maintaining the integrity of the crystal structure, and when the citric acid concentration is 0.10 mol/L, the crystallinity of the three-cross lemon three-baked (E) sample is 82%, and the silicon-aluminum ratio reaches 13.60.