Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (11): 2511-2518.doi: 10.7503/cjcu20200330

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Nano-sized SAPO-34 via Concentrated Gel Conversion Method and Its CH4/N2 Separation Performance

LIU Jiaqi1, TANG Xuan1, WU Luogang1, YANG Jiangfeng1,2(), LI Libo1,2, LI Jinping1,2   

  1. 1.Research Institute of Special Chemicals,College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China
    2.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,China
  • Received:2020-06-05 Online:2020-11-10 Published:2020-11-06
  • Contact: YANG Jiangfeng E-mail:yangjiangfeng@tyut.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(51672186);the Shanxi Coalbed Methane Joint Fund Project, China(2016012005)

Abstract:

Nano-sized SAPO-34 molecular sieve with a thickness of ca. 50 nm was synthesized by concentra- ted gel conversion method. The obtained samples were characterized by means of XRD, SEM, ICP as well as N2 adsorption-desorption isotherms(77 K). The results show that the synthesized nano-sized SAPO-34 has higher specific surface area(818.68 m2/g) and pore volume(0.57 cm3/g) compared with the micron cubic SAPO-34(2 μm). With higher specific surface and pore volume, the adsorption capacity of CH4 on the nano-sized SAPO-34 is greatly increased(60%), reaching 25.74 cm3/g, which is higher than most of the commercial zeolite adsorbents. At the same time, the adsorption selectivity of CH4/N2 is not significantly decreased(3.1), and reaches the level of commercial adsorbents(>3.0). Through CH4/N2(volume ratio 1∶1) mixture gas breakthrough test, it is proved that the synthesized nano SAPO-34 is indeed an effective CH4/N2 separation adsorbent and has great potential in the industrial application of coalbed methane enrichment and denitrification.

Key words: SAPO-34, Nano-sized zeolite, Concentrated gel, CH4/N2 separation

CLC Number: