| 煤系高岭土合成NaA分子筛及其机理分析 |
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| 引用本文： | 周志辉,吕振华,刘红,杨建华,王金渠.煤系高岭土合成NaA分子筛及其机理分析[J].武汉冶金科技大学学报,2010(6):614-619. |
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| 作者姓名： | 周志辉 吕振华 刘红 杨建华 王金渠 |
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| 作者单位： | [1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]大连理工大学精细化工国家重点实验室,辽宁大连116012 |
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| 基金项目： | 武汉科技大学绿色制造与节能减排科技研究中心开放基金资助项目（B0917） |
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| 摘 要： | 以煅烧煤系高岭土为原料,采用氢氧化钠溶液水热合成制备NaA分子筛。以NaA分子筛晶体的生长过程为基础,利用XRD、SEM对NaA分子筛晶体生长规律进行表征,并对其结晶机理进行了分析。结果表明,煤系高岭土制备NaA分子筛的最佳工艺条件是：煅烧温度为725℃;配料比m（Na2O）/m（SiO2）为3,m（H2O）/m（Na2O）为40;胶化条件为70℃×2 h;晶化条件为100℃×6 h。所制NaA分子筛的钙离子交换量为316.55 g CaCO3/g。在NaA分子筛的碱液合成过程中,在晶化条件下,凝胶固相中的硅铝酸根骨架解聚重排晶化成沸石晶体骨架。
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| 关 键 词： | 高岭土 NaA分子筛 水热合成 钙离子交换量 晶化机理 |
Synthesis of NaA zeolite from kaolin and its crystallization mechanism |
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| Authors: | Zhou Zhihui Lu Zhenhua Liu Hong Yang Jianhua Wang Jinqu |
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| Affiliation: | 1.College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;2.State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116012,China) |
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| Abstract: | NaA zeolite was successfully synthesized with hydrothermal method from calcined kaolin used as sources for both silica and alumina.The growth of NaA zeolite was studied by XRD and SEM,and the crystallization process of NaA zeolite in the hydrothermal reaction system was ana-lyzed.The optimal synthesis conditions were found to be as follows： m（Na2O）/m（SiO2）=3;m（H2O）/m（Na2O）=40;the calcining temperature is 730 ℃;the temperature and time in the gel formation stage are 70 ℃ and 3 h;and the temperature and time in the crystallization stage are 100 ℃ and 6 h,respectively.Kaolin is suggested to be a feasible and economical raw material for practical industrial production of NaA zeolite. |
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| Keywords: | kaolin NaA zeolite hydrothermal synthesis calcium ion exchange crystallization mechanism |
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