高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (3): 683.doi: 10.7503/cjcu20200668

• 无机化学 • 上一篇    下一篇

有机硅烷辅助合成特殊形貌SAPO分子筛

王冶1,2, 张晓思2, 孙丽婧2, 李冰2, 刘琳2, 杨淼2(), 田鹏2(), 刘仲毅1, 刘中民2   

  1. 1.郑州大学化学学院, 绿色催化研究中心, 郑州 450001
    2.中国科学院大连化学物理研究所甲醇制烯烃国家工程实验室, 洁净能源国家实验室, 大连 116023
  • 收稿日期:2020-09-09 出版日期:2021-03-10 发布日期:2021-03-08
  • 通讯作者: 杨淼,田鹏 E-mail:yangmiao@dicp.ac.cn;tianpeng@dicp.ac.cn
  • 基金资助:
    国家自然科学基金(批准号(21676262);21991090, 21991091)和中国科学院大连化学物理研究所创新研究基金(DICP I201909)

Morphology Control of SAPO Molecular Sieves under the Assistance of Organosilane

WANG Ye1,2, ZHANG Xiaosi2, SUN Lijing2, LI Bing2, LIU Lin2, YANG Miao2(), TIAN Peng2(), LIU Zhongyi1, LIU Zhongmin2   

  1. 1.Green Catalysis Center,College of Chemistry,Zhengzhou University,Zhengzhou 450001,China
    2.National Engineering Laboratory for Methanol to Olefins,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China
  • Received:2020-09-09 Online:2021-03-10 Published:2021-03-08
  • Contact: YANG Miao,TIAN Peng E-mail:yangmiao@dicp.ac.cn;tianpeng@dicp.ac.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21676262);the Innovation Research Foundation of Dalian Institute of Chemical Physics, Chinese Academy of Sciences(DICP I201909)

摘要:

以异丙胺(IPA)为模板剂, 3-哌嗪基丙基甲基二甲氧基硅烷(PZPMS)为助剂, 水热合成出由纳米片组装而成的鸟巢状SAPO-5和纳米晶组装体SAPO-34. 考察了模板剂、 有机硅烷和硅投料量对晶化的影响, 发现合成产品的晶相和形貌随有机硅烷的添加依次变为SAPO-14, SAPO-5和SAPO-5/SAPO-34的混相. 固定PZPMS的量不变, 产物晶相随硅烷投料量的增加从SAPO-5逐渐转变成SAPO-34分子筛. 对合成的特殊形貌SAPO分子筛进行了表征, 并结合对比实验揭示PZPMS与IPA的复配是获得特殊形貌SAPO分子筛的关键. 此外, 所制备的SAPO-34样品由于良好扩散传质性能, 在甲醇制烯烃(MTO)反应中显示了优异的催化性能, 乙烯加丙烯选择性最高可达86.95%.

关键词: SAPO分子筛, 形貌调控, 有机硅烷, 水热合成

Abstract:

SAPO-5 and SAPO-34 molecular sieves with special morphology were synthesized by employing isopropylamine(IPA) as the organic-structure directing agent and 3-piperazinylpropylmethyldimethoxysilane(PZPMS) as a mesoporogen. The effects of the amounts of organosilane and silica source were systematically investigated which may change both crystalline phase and the crystal morphology. The products were SAPO-14, SAPO-5 and SAPO-5/SAPO-34 in turn as the addition and increase of PZPMS. SAPO-5 will transfer to SAPO-34 with the increased dosage of TEOS. The synthesized samples were well characterized, and the pre-sence of PZPMS in the product was confirmed. Hierachical channels formed after removal of the organics, and the MTO catalytic performance of SAPO-34 molecular sieve was significantly improved. Furthermore, it exhi-bited 86.95% selectivity for ethylene and propylene. The hydrogen bond interaction between PZPMS and IPA is the key to synthesize SAPO with special morphology. This work provides an effective strategy to control the morphology of SAPO molecular sieves.

Key words: SAPO molecular sieve, Morphology control, Organosilane, Hydrothermal synthesis

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