Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 683.doi: 10.7503/cjcu20200668

• Inorganic Chemistry • Previous Articles     Next Articles

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)

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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