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CO2-CH4混合物の共吸附と分離は,高度に柔軟な MIL-53 (((Cr) MOF で行われます

Lomig Hamon¹, Philip L Llewellyn, Thomas Devic

¹IFP, Direction Catalyse et Séparation, 69360 Solaize, France.

Journal of the American Chemical Society

|November 13, 2009

まとめ

柔軟な金属有機フレームワークMIL-53 ((Cr)) は,二酸化炭素 (CO2) とメタン (CH4) を分離する有望なことを示しています. CO2は狭い孔を好んで占め,選択的なガス分離を可能にします.

科学分野:

材料科学材料科学とは
化学化学は化学です.
化学工学は化学工学というものです.

背景:

柔軟な多孔性材料は,ガス分離技術において極めて重要です.
クロミウムテレフタレート (MIL-53(Cr) は,ガス吸収時にユニークな"呼吸"効果を示しています.

研究の目的:

MIL-53 ((Cr)) を使用して,環境温度で二酸化炭素 (CO2) とメタン (CH4) の共吸収を調査する.
CO2/CH4混合物に対するMIL-53 (Cr) の構造的反応を理解し,その分離能力を評価する.

主な方法:

In situシンクロトロンX線粉末微分とラーマン光譜で,構造変化と吸収量をモニターします.
定量的コアソープション測定のための重力測定と突破曲線分析.
吸収相組成をモデル化するためのコンピュータシミュレーション.

主要な成果:

MIL-53 ((Cr) は,主にCO2の部分圧力によって制御される純粋なCO2吸収に類似した"呼吸"行動を表します.
メタン (CH4) の含有は,大きな孔 (LP) から狭い孔 (NP) 形への変換を妨げます.
CH4はNP形態から除外され,これは選択的吸収を示すCO2分子によってのみ占められている.

結論:

MIL-53 ((Cr)) は,孔詰めダイナミクスによって誘発されるCH4よりも選択的なCO2吸収を示しています.
材料の構造的柔軟性と孔選択的吸収は,CO2/CH4分離の鍵となる.
MIL-53 ((Cr) は,天然ガスの浄化のための圧力振動吸収 (PSA) プロセスでの応用の可能性を示しています.

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