孔間区分を有効にした例外的なエタンの吸収とエタンの選択的なエタンの分離
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
まとめ
新しい結晶性多孔材料 (CPM) は,C2H6/C2H4分離の基準材料よりもエタン (C2H6) の吸収能力が著しく高い. これらの堅固なCPMは,ガスの分離技術の改善を約束しています.
科学分野:
- 材料科学
- 化学工学
- 分離科学
背景:
- エタン (C2H6) とエチレン (C2H4) の効率的な分離は,石油化学プロセスにおいて極めて重要です.
- ペロキシ機能化されたMOF-74-FeはC2H6/C2H4分離のための基準材料であり,高い選択性を持ちながらもC2H6吸収能力は適度である (74.3cm3/g).
- 理想的な材料には,高いC2H6吸収能力と高いC2H6 / C2H4選択性が必要であり,この組み合わせは達成することが困難です.
研究 の 目的:
- C2H6/C2H4分離のための強化されたC2H6吸収能力を持つ新鮮な結晶性多孔材料 (CPM) を開発する.
- 孔隙空間で区切られたCPMの分離の可能性と性質を調査する.
- ペロキソ-MOF-74-Feのような既存の基準の性能を上回る可能性のある材料を調査する.
主な方法:
- 孔隙空間分割の結晶性多孔性材料 (CPM) の一族の合成と特徴付け
- 1 atmと298 KでのC2H6吸収能力の測定
- C2H6 / C2H4の選択性と吸収の同位体熱の評価
- 熱と水の安定性,再生エネルギー,材料の調製性に関する評価
主要な成果:
- CPMは166.8cm3/gのC2H6吸収能力を達成し,これはペロキシ-MOF-74-Feの2倍以上です.
- これらのCPMはC2H6/C2H4の適度な選択性 (最大1.75) を表しているが,基準値と比較して著しく低いイソステリック吸収熱 (21.9〜30.4kJ/mol) を有している.
- 開発されたCPMは,高い熱安定性 (450°Cまで),水中安定性,低再生エネルギー,および高いトーナビリティを示しています.
結論:
- 新しく開発された孔間分割型CPMは,より優れたC2H6吸収能力により,C2H6/C2H4分離のための有望な代替手段を提供します.
- 選択性はまだペロキシ-MOF-74-Feを上回らないが,これらのCPMの頑丈な特性と調節性は,産業用アプリケーションに重要な利点をもたらしている.
- これらの材料は,選択的なガス分離のための高度な吸着剤を設計するための新しい道を開きます.
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