晶化时间及母液循环对 SAPO-34 分子筛合成的影响
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引用本文:申韬艺,刘晨,陈通,王利军,乔永民,吴敏昌.晶化时间及母液循环对 SAPO-34 分子筛合成的影响[J].上海第二工业大学(中文版),2021,(1):15-21
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作者单位
申韬艺 1. 上海第二工业大学 环境与材料工程学院, 上海 201209
 
刘晨 1. 上海第二工业大学 环境与材料工程学院, 上海 201209
 
陈通 1. 上海第二工业大学 环境与材料工程学院, 上海 201209
 
王利军 1. 上海第二工业大学 环境与材料工程学院, 上海 201209
2. 宁波聚才新材料科技有限公司, 浙江 宁波 315311
 
乔永民 3. 上海杉杉科技有限公司, 上海 201209 
吴敏昌 3. 上海杉杉科技有限公司, 上海 201209 
基金项目:上海第二工业大学研究生项目基金 (EGD19YJ0043), 宁波市 3315 资本引才计划 (2020C-04-7) 资助
中文摘要:以二乙胺为模板剂采用传统水热法制备 SAPO-34 分子筛, 研究了不同晶化时间下分子筛晶体结构与形貌 的变化。以 X 射线衍射仪 (XRD) 与扫描电镜 (SEM) 测试结果确定最佳产物并回收所得晶化母液。以此为初始凝胶 环境, 在不添加有机模板剂的条件下补充原料制备 SAPO-34 分子筛。确定了最佳晶化时间, 并对两种合成方法所得 最佳产物进行了傅里叶红外光谱仪 (FTIR) 与氨气程序升温脱附 (NH3-TPD) 测试。结果表明, 在 200 ℃ 条件下传统 水热法需 48 h 得到最佳产物, 母液循环法仅需 36 h, 晶化速度更快。两种方法制备所得分子筛具有相似的骨架结构 与酸性, 证明母液循环在保证产物一致的前提下加快了制备速度, 实现了母液的循环回用与分子筛的绿色合成。
中文关键词:SAPO-34 分子筛  晶化时间  晶化母液  循环回用
 
Effect of Crystallization Time and Mother Liquor Recycling onthe Synthesis of SAPO-34 Molecular Sieve
Abstract:The SAPO-34 molecular sieve was prepared by traditional hydrothermal method with diethylamine as the template, and the changes of the molecular sieve crystal structure and morphology under different crystallization time were studied. The X-ray diffractometer (XRD) and scanning electron microscope (SEM) test results were used to determine the best product and recover the crystallization mother liquor. Using mother liquor as the initial gel environment, the SAPO-34 was prepared by supplementing raw materials without adding organic templates, and the optimal crystallization time was determined. Fourier transform infrared spectroscopy (FTIR) and ammonia desorption by programmed temperature (NH3-TPD) were carried out on the both optimal products of the two synthetic methods. The results show that the traditional hydrothermal method takes 48 h to obtain the best product at 200 ℃, while the mother liquor recycling method only needs 36 h, which has faster crystallization speed. The molecular sieves obtained by the two methods have similar skeleton structures and acidity, which proves that the mother liquor recycling method accelerates the preparation speed while ensuring the consistency of the products, and realizes the mother liquor reuse and green synthesis in the meantime.
keywords:SAPO-34 molecular sieve  crystallization time  mother liquor  recycling
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