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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

偏高岭土水热合成高硅SAPO-5分子筛及其表征

周新涛1, 刘起峰1, 苏达根2， 来兰梅1   

  1. 1. 商丘师范学院 化学系， 商丘 476000； 2. 华南理工大学 材料学院， 广州 510640
  • 收稿日期:2008-07-21 修回日期:2008-09-04 出版日期:2009-05-20 网络出版日期:2009-05-20

Synthesis and Characterization of Highsilica SAPO-5 from Metakolin

ZHOU Xin-Tao1, LIU Qi-Feng1, SU Da-Gen2，LAI Lan-Mei1   

  1. 1. Department of Chemistry, Shangqiu Normal University, Shangqiu 476000，China; 2. College of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2008-07-21 Revised:2008-09-04 Published:2009-05-20 Online:2009-05-20

PDF (PC)

1878

被引次数

10 | 1

摘要： 以具有一定活性的偏高岭土兼作铝源与硅源，正磷酸作磷源，三乙醇胺和十六烷基三甲基溴化铵为复合模板剂，采用分段晶化的方法水热合成了高硅磷酸硅铝分子筛(SAPO-5). 利用X射线衍射分析（XRD）、红外光谱分析（FTIR）、扫描电镜(SEM)、29Si, 27Al MAS-NMR (固态核磁共振)、X光电能谱(XPS)，吸附氨的程序升温脱附（NH3-TPD）等手段对产物进行了表征. 研究结果表明:采用十六烷基三甲基溴化铵复合三乙醇胺作模板剂，可以促进SAPO-5晶体产物的形成，其产物形貌为尺寸大约20μm×5μm×5μm的规则柱状晶体. IR、MASNMR及XPS分析表明，反应后结构中的Si、Al的配位环境发生了较大的变化，形成了较多Al(OP)4及Si(AlO)4两种四配位结构，其Si/Al为0.56. 产物分子筛中的总酸量为0.578mmol/g，中强酸与弱酸比例为0.684.

关键词: 高岭土, 偏高岭土, 水热, SAPO-5

Abstract: Highsilica silicoaluminophosphate (SAPO-5) molecular sieves were hydrothermally synthesized using metakaoline with a certain activity as the silicon and aluminum sources, phosphoric acid as the phosphorus source and triethanolamine combined with cetyltrimethylammonium bromide (CTMABr) as the template agents. The sample was characterized by means of X-ray diffraction spectroscope (XRD), Infrared spectrum (IR), scanning electron microscope (SEM) and 29Si, 27Al MAS-NMR and X-ray photoelectron spectroscope (XPS), temperatureprogrammed desorption of adsorbed NH3. The results show that the crystallization of the SAPO-5 can be promoted by the addition of CTMABr. The synthesized SAPO-5 reveals pillarlike morphology with dimension of 20μm×5μm×5μm. The local environment of Si and Al changs greatly after reaction and many fourcoordinated structures such as Al(OP)4 and Si(AlO)4 are produced with the Si/Al ratio of 0.56. The acidity amount of the product is 0.578mmol/g and the ratio of the strong acid sites to the weak acid sites is 0.684.

Key words: kaolin, metakaolin, hydrothermal, SAPO-5

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