三氟乙酸对有机-无机杂化二氧化硅膜CO2输运性能的催化作用

IF 4.9 Q1 ENGINEERING, CHEMICAL
Ikram Rana, Hiroki Nagasawa, Toshinori Tsuru, Masakoto Kanezashi
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引用次数: 0

摘要

开发对CO2具有高度选择性的二氧化硅膜一直是一个挑战,因为在典型的二氧化硅网络结构中,孔的尺寸较小,亲CO2位点的数量较少。在此,我们描述了用3-氨基丙基三乙氧基硅烷(APTES)和三氟乙酸(TFA)功能化的二氧化硅(四乙氧基硅烷)膜的制备。发现了伯(NH2)胺和TFA之间产生的相互作用,随后CO2吸附/解吸的可逆性质也揭示了这一点——这与使用另一种催化剂(HCl)时的观察结果相反。所得的TEOS-APTES(TFA)膜在50℃时表现出3.8×10−7 mol m−2 s−1 Pa−1的CO2渗透性和35的CO2/N2选择性⁰C通过表面扩散的作用。这归因于TFA影响的微孔性增加和结构变化,TFA通过与胺的相互作用增强了分子筛分并控制了亲CO2位点(-NHCOCF3)。这种新方法对于高效制造高CO2渗透膜是有效的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes

Developing silica membranes that are highly selective for CO2 has always been a challenge due to the small sizes of the pores and less amount of CO2 philic sites in a typical silica network structure. Herein, we describe the fabrication of silica (tetraethoxysilane) membranes functionalized with 3-aminopropyltriethoxysilyl (APTES) and trifluoroacetic acid (TFA). An interaction generated among primary (NH2) amines and TFA was identified, which was then also revealed by the reversible nature of CO2 adsorption/desorption — an opposite trend from observations when using another catalyst (HCl). The resultant TEOS-APTES (TFA) membranes demonstrated CO2 permeance of 3.8 × 10−7 mol m  2 1 Pa−1 and CO2/N2 selectivity of 35 at 50 ⁰C via the effect of surface diffusion. This is attributed to the increased microporosity and structural variations affected by TFA, which enhanced molecular sieving and controls the CO2-philic sites (-NHCOCF3) via interaction with amines. This novel approach would be effective for the energy-efficient fabrication of highly CO2-permeable membranes.

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