Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1716.doi: 10.7503/cjcu20200855

• Inorganic Chemistry • Previous Articles     Next Articles

Exploring Organic Structure-directing Agents Used for SAPO-34 to Synthesize SSZ-13

WANG Lei1,2, SUN Tantan2,3, YAN Nana2, MA Chao2,3,4, LIU Xiaona2,3, TIAN Peng2, GUO Peng2(), LIU Zhongmin2,3   

  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
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.Zhang Dayu School of Chemistry,Dalian University of Technology,Dalian 116023,China
  • Received:2020-12-09 Online:2021-06-10 Published:2021-03-24
  • Contact: GUO Peng E-mail:pguo@dicp.ac.cn
  • Supported by:
    This paper is supported by the National Natural Science Foundation of China(21972136);the CAS Pioneer Hundred Talents Program(Y706071202);the Dalian National Laboratory for Clean Energy(DNL) Cooperation Fund,Chinese Academy of Sciences(DNL201908);the Key Research Program of Frontier Sciences, Chinese Academy of Sciences(QYZDBSSW-JSC040)

Abstract:

The aluminosilicate zeolite SSZ-13 and zeolitic silicoaluminophosphate molecular sieve(SAPO MS) SAPO-34 have been widely used in commercialized catalytic applications, such as the methanol-to-olefins(MTO) process and the selective catalytic reduction of NOx with NH3(NH3-SCR). Nowadays, a variety of commercialized organic structure-directing agents(OSDAs) have been utilized for preparing SAPO-34, while the OSDAs for synthesizing SSZ-13 still mainly relies on the classical N,N,N-trimethyladamantammonium hydroxide(TMAdaOH). Therefore, it is of great significance to seek for the suitable OSDAs, which can direct the synthesis of SSZ-13 with higher cost performance and appliable high silicon-to-alumina ratio(SAR). Herein, three OSDAs used for preparing SAPO-34[diisopropylamine(DIPA), dipropylamine(DPA) and n-butylamine(nBA)] were successfully employed for synthesizing SSZ-13 by partial replacing the expensive TMAdaOH with or without the assistance of seeds. Systemic investigation focused on SSZ-13 preparation was explored by powder X-ray diffraction(PXRD) and solid-state nuclear magnetic resonance(ss-NMR) analyses. As a result, the as-synthesized SSZ-13 zeolites possess a tunable range of SARs(11―22) and Cu-SSZ-13 catalysts show excellent NH3-SCR performance compared with commercialized ones. The crystallization mechanism of SSZ-13 synthesized by DIPA and TMAdaOH were also studied and the addition of DIPA would accelerate the crystallization process, improve the yields, and prevent the formation of amorphous phase. The work presented here might provide new insights for identifying more efficient and commercialized OSDAs for preparing SSZ-13 with tailored properties.

Key words: Porous material, Zeolite, Organic structure-directing agent, SSZ-13, SAPO-34

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