高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (11): 2511-2518.doi: 10.7503/cjcu20200330

• 物理化学 • 上一篇    下一篇

浓凝胶转换法制备纳米SAPO-34及其CH4/N2吸附分离性能研究

刘佳奇1, 唐轩1, 吴罗钢1, 杨江峰1,2(), 李立博1,2, 李晋平1,2   

  1. 1.太原理工大学化学化工学院精细化工研究所, 太原 030024
    2.气体能源高效清洁利用山西省重点实验室, 太原 030024
  • 收稿日期:2020-06-05 出版日期:2020-11-10 发布日期:2020-11-06
  • 通讯作者: 杨江峰 E-mail:yangjiangfeng@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(51672186);山西省煤层气联合基金项目(2016012005)

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)

摘要:

通过浓凝胶转换法合成了一种厚度约为50 nm, 大小约为200 nm的纳米片状SAPO-34分子筛, 经XRD, SEM, ICP和氮气(77 K)吸附-脱附等方法对其进行了表征, 结果显示, 相比于微米级立方体形的SAPO-34 (2 μm), 本文合成的纳米片状SAPO-34表现出更高的比表面积(818.68 m2/g)和孔容(0.57 cm3/g). 比表面和孔容积的增大使其气体吸附容量得到较大的提升, 其中CH4的吸附容量达到25.74 cm3/g, 提升了60%, 高于绝大多数分子筛吸附剂, 同时CH4/N2的吸附选择性未出现明显下降(3.1), 且达到商用吸附剂水平(>3.0). 通过CH4/N2(体积比1∶1, 298 K)混合气体穿透测试证明所合成的纳米SAPO-34是一种有效的CH4/N2分离吸附剂, 在煤层气富集脱氮工业中具有极大的应用潜力.

关键词: SAPO-34, 纳米分子筛, 浓凝胶, CH4/N2分离

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

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