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Abstract：
Efficient separation of CH4 from N2 is essential for the purification of methane from nitrogen. In order to address this problem, composite materials consisting of rod-shaped SBA-15-based UiO-66-Br2 were synthesized for the purpose of separating a CH4/N2 mixture. The materials were characterized via PXRD, N2 adsorption-desorption, SEM, TEM, FT-IR, and TGA. The adsorption isotherms of CH4 and N2 under standard pressure conditions for the composites were determined and subsequently compared. The study revealed that the composites were formed through the growth of MOF nanocrystals on the surfaces of the SBA-15 matrix. The enhancements in surface area and adsorption capacity of hybrid materials were attributed to the structural modifications resulting from the interactions between surface silanol groups and metal centers. The selectivity of the composites towards a gas mixture of CH4 and N2 was assessed utilizing the Langmuir adsorption equation. The results of the analysis revealed that the U6B2S5/SBA-15 sample exhibited the greatest selectivity for CH4/N2 adsorption compared to the other samples, with an adsorption selectivity parameter (S) of 20.06. Additional research is necessary to enhance the enrichment of methane from CH4/N2 mixtures using SBA-15-based metal-organic framework materials.
摘要：
从N2中有效分离CH4对于从氮气中纯化甲烷是必不可少的。为了解决这个问题,合成了由棒状SBA-15基UiO-66-Br2组成的复合材料，用于分离CH4/N2混合物。通过PXRD对材料进行了表征，N2吸附-解吸,SEM,TEM,FT-IR,和TGA。确定了CH4和N2在标准压力条件下对复合材料的吸附等温线，然后进行了比较。研究表明，复合材料是通过MOF纳米晶体在SBA-15基体表面的生长形成的。杂化材料的表面积和吸附能力的增强归因于表面硅烷醇基团与金属中心之间的相互作用引起的结构修饰。利用Langmuir吸附方程评估了复合材料对CH4和N2气体混合物的选择性。分析结果表明，与其他样品相比，U6B2S5/SBA-15样品对CH4/N2吸附的选择性最大，吸附选择性参数(S)为20.06。需要进行其他研究，以使用SBA-15基金属有机骨架材料增强CH4/N2混合物中甲烷的富集。
