Cu-trimesate and mesoporous silica composite as adsorbent showing enhanced CO2/CH4 and CO2/N2 selectivity for biogas and flue gas separation

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-10-02 DOI:10.1016/j.micromeso.2024.113354

Suman Dalakoti , Narendra Singh , Anjali Sharma , Anjali Singh , Madhur Sachdeva , Swapnil Divekar , Aarti Arya , R. Surya Murali , Soumen Dasgupta

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Abstract

Due to their diverse structure, high porosity, and tunable functionality, Metal-Organic Frameworks (MOFs) hold great potential as materials for diverse applications, including gas separation. Material science researchers are focusing on creating flexible materials that have special properties. Most of the latest research mainly concentrates on fabricating composite materials of MOFs and other functional materials. These MOF-based composites can mitigate the limitations of pure MOFs and may even perform better than the individual components. Here, we present a systematic study on the effect of solvent in synthesising a composite (Cu-BTC@SBA-15) of Cu-trimesate MOF (aka CuBTC) and ordered mesoporous silica SBA-15, showing considerable improvement in selectivity for CO₂ adsorption from the flue gas and biogas. The pristine Cu-BTC, SBA-15 and the composites with different content of Cu-BTC were characterized by PXRD, BET, FT-IR, SEM, TEM and TGA techniques. The pure gas adsorption isotherms were measured for CO₂, CH₄, and N₂ gases. Ideal Adsorbed Solution Theory (IAST) is used for the binary selectivity calculations for gas systems such as CO₂/CH₄ and CO₂/N₂ in the context of biogas and flue gas separation. The composite exhibited an increase in CO₂/CH₄ selectivity by 39 % compared to pure Cu-BTC and 85 % compared to pure SBA-15. For the CO₂/N₂ system, the composite showed 38 % higher selectivity than Cu-BTC. The work has significance in the design of effective MOF-based composites for CO₂ separation. Our work might open up a new route to design multifunctional materials for worldwide applications through an adsorptive and or mixed matrix membrane route.

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铜-三酸铜和介孔二氧化硅复合吸附剂在沼气和烟气分离中显示出更高的 CO2/CH4 和 CO2/N2 选择性

金属有机框架（MOFs）具有结构多样、孔隙率高和功能可调等特点，因此作为包括气体分离在内的多种应用材料具有巨大潜力。材料科学研究人员正致力于创造具有特殊性能的柔性材料。大多数最新研究主要集中在制造 MOF 和其他功能材料的复合材料上。这些基于 MOF 的复合材料可减轻纯 MOF 的局限性，其性能甚至可能优于单个成分。在此，我们系统研究了溶剂对合成铜-三酸盐 MOF（又称 CuBTC）和有序介孔二氧化硅 SBA-15 复合材料（Cu-BTC@SBA-15）的影响，结果表明，该复合材料对烟道气和沼气中 CO2 的吸附选择性有显著提高。原始 Cu-BTC、SBA-15 和不同 Cu-BTC 含量的复合材料通过 PXRD、BET、FT-IR、SEM、TEM 和 TGA 技术进行了表征。测量了 CO2、CH4 和 N2 气体的纯气体吸附等温线。理想吸附溶液理论（IAST）被用于计算沼气和烟气分离中 CO2/CH4 和 CO2/N2 等气体系统的二元选择性。与纯 Cu-BTC 相比，复合材料的 CO2/CH4 选择性提高了 39%，与纯 SBA-15 相比，提高了 85%。在 CO2/N2 系统中，复合材料的选择性比 Cu-BTC 高 38%。这项工作对于设计有效的基于 MOF 的复合材料用于二氧化碳分离具有重要意义。我们的工作可能会开辟一条新的途径，通过吸附膜或混合基质膜途径设计出多功能材料，应用于全球范围。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.