允许孔间隔离的异常乙吸收和乙选择性乙分离
Huajun Yang1,2, Yanxiang Wang2, Rajamani Krishna3
1Department of Chemistry and Biochemistry , California State University , Long Beach , California 90840 , United States.
Journal of the American Chemical Society
|January 28, 2020
概括
新的晶体多孔材料 (CPM) 与C2H6/C2H4分离的基准材料相比,具有显著更高的乙 (C2H6) 吸收能力. 这些强大的CPM显示了改善气体分离技术的前景.
科学领域:
- 材料科学
- 化学工程
- 分离科学
背景情况:
- 在石化过程中,有效地将乙 (C2H6) 与乙烯 (C2H4) 分离至关重要.
- 氧功能化MOF-74-Fe是C2H6/C2H4分离的基准材料,具有高选择性但中等的C2H6吸收能力 (74.3 cm3/g).
- 理想的材料需要高的C2H6吸收能力和高的C2H6/C2H4选择性,这种组合仍然具有挑战性.
研究的目的:
- 开发具有增强C2H6吸收能力的新型晶体多孔材料 (CPM),用于C2H6/C2H4分离.
- 调查这些孔隙空间分隔的CPM的分离潜力和特性.
- 探索可能超越现有基准性能的材料,如过氧MOF-74-Fe.
主要方法:
- 一个孔隙空间分区的晶体多孔材料 (CPM) 的合成和特征.
- 在1 atm和298 K时测量C2H6的吸收能力.
- 对C2H6/C2H4选择性和同质吸附热的评估.
- 评估热稳定性和水稳定性,再生能量和材料的可调性.
主要成果:
- CPM的C2H6吸收能力高达166.8cm3/g,是过氧MOF-74-Fe的两倍多.
- 这些CPM具有适度的C2H6/C2H4选择性 (高达1.75),但与基准相比,它们具有显著较低的异质吸附热量 (21.9-30.4kJ/mol).
- 开发的CPM具有高热稳定性 (高达450°C),水稳定性,低再生能量和高鱼性.
结论:
- 由于新开发的孔隙隔离CPM具有较高的C2H6吸收能力,因此为C2H6/C2H4分离提供了有前途的替代方案.
- 虽然选择性还没有超过过氧MOF-74-Fe,但这些CPM的强度和可调性为工业应用带来了显著的优势.
- 这些材料为设计选择性气体分离的先进吸附剂开辟了新的途径.
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