高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (4): 616-622.doi: 10.7503/cjcu20200083

• 庆祝《高等学校化学学报》复刊40周年专栏 • 上一篇    下一篇

多级孔NaX分子筛的合成及CO2吸附性能

王煜瑶1,张强1,于吉红1,2,*()   

  1. 1. 吉林大学无机合成与制备化学国家重点实验室, 化学学院;
    2. 未来科学国际合作联合实验室, 长春 130012
  • 收稿日期:2020-02-19 出版日期:2020-04-10 发布日期:2020-03-06
  • 通讯作者: 于吉红 E-mail:jihong@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(21621001)

Synthesis of Hierarchical NaX Zeolite and Its CO2 Adsorption Performance

WANG Yuyao1,ZHANG Qiang1,YU Jihong1,2,*()   

  1. 1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry
    2. International Center of Future Science, Jilin University, Changchun 130012, China
  • Received:2020-02-19 Online:2020-04-10 Published:2020-03-06
  • Contact: Jihong YU E-mail:jihong@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(21621001)

摘要:

采用两步晶化和氨基酸辅助的协同合成策略, 制备了具有高产率(89%)和高结晶度(微孔体积为0.30 cm 3/g)的多级孔NaX分子筛. 利用X射线粉末衍射、 扫描电子显微镜、 透射电子显微镜和氮气吸附等技术, 考察了两步晶化和氨基酸加入量对NaX分子筛的形貌、 相对结晶度和产率的影响. 实验结果表明, 两步晶化有利于多级孔结构的产生, 氨基酸的引入有助于提高分子筛相对结晶度和产率. 与传统方法合成的NaX分子筛相比, 该合成策略制备的多级孔NaX分子筛展现出更优异的CO2吸附性能, 在273 K和100 kPa条件下, 其CO2吸附量达到154.2 cm 3/g, 而传统NaX分子筛的CO2吸附量为147.6 cm 3/g. 该合成策略为绿色且高效制备高质量的多级孔分子筛提供了新思路.

关键词: NaX分子筛, 多级孔, 两步晶化, L-赖氨酸, CO2吸附

Abstract:

High-quality hierarchical NaX zeolites with high product yield and high crystallinity were prepared by synergistically using a two-step crystallization process and L-lysine-assisted approach. XRD, SEM, TEM, XRF and N2 adsorption-desorption tests are used to investigate the influence of L-lysine and crystallization steps on the mesoporosity, crystallinity, and the yield of NaX zeolites. In this synthetic strategy, two-step crystallization favors the generation of mesopores; and L-lysine plays an important role in improving the zeolite crystallinity as well as the product yield. Owing to the high-quality hierarchical zeolite crystals, the as-prepared NaX zeolite exhibits excellent performance in CO2 adsorption with CO2 uptake of 154.2 cm 3/g at 273 K and 100 kPa. This green and facile synthetic strategy opens a new way to fabricate high-quality hierarchical NaX zeolites, promising their practical applications in CO2 adsorption.

Key words: NaX zeolite, Hierarchical structure, Two-step crystallization, L-lysine, CO2 adsorption

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