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China Surfactant Detergent & Cosmetics ›› 2019, Vol. 49 ›› Issue (4): 229-233.doi: 10.3969/j.issn.1001-1803.2019.04.005

• Development and application • Previous Articles     Next Articles

Sodium-free synthetic process and characterization of SSZ-13molecular sieves

MIN Ling-fei1,LIANG Ya-ning2,LI Ning2,LI Xiao-feng1(),DOU Tao1   

  1. 1. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan,Shanxi 030024, China
    2. Taiyuan Dacheng Environment & Energy Chemical Technology Co., Ltd, Taiyuan, Shanxi 030024, China;
  • Received:2018-09-04 Revised:2019-04-02 Online:2019-04-22 Published:2019-04-24
  • Contact: Xiao-feng LI E-mail:lixiaofeng6008@163.com

Abstract:

SSZ-13 molecular sieves with different silica-alumina ratios were synthesized by sodium-free one-step hydrothermal method in which ammonia water was used to replace NaOH as alkaline source, ammonium-type silica sol and aluminum sulfate were used as silicon and aluminum sources, and N,N,N-trimethyl-1-adamantyl ammonium hydroxide was used as the organic template agent. The products were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), FT-IR, temperature-programmed desorption of ammonia(NH3-TPD), elemental analysis, thermogravimetric analysis(TG-DTG) and isothermal N2 adsorption and desorption(BET). The catalytic performance of the products was evaluated by Methanol-to-Olefins(MTO) reaction. The results show that the particle size of SSZ-13 molecular sieves with different silica-alumina ratios synthesized by ammonia is decreased with the increase of silica-alumina ratio; the products synthesized can be directly used after calcination for catalytic reaction; in the catalytic reaction of MTO, the catalyst with silica-alumina ratio of 75 exhibits a life span nearly 2.6 times longer than the one with silica-alumina ratio of 25.

Key words: ammonia liquor, ammonium-type SSZ-13 molecular sieve, sodium-free method, Methanol-to-Olefins

CLC Number: 

  • TQ424.25