Preparation, Gas Separation and Hydrothermal Stability Property of Organic-inorganic Hybrid Silica Membranes Modified by Trifluoropropyl Groups
Received date: 2012-08-20
Online published: 2012-11-26
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 21171014 and 50502002), the National High Technology Research and Development Program of China (863 Program) (No. 2009AA03Z213) and the Open Foundation of State Key Laboratory Breeding Base of Green Chemistry- Synthesis Technology of Zhejiang Province (No. GCTKF2012016).
Organic-inorganic hybrid silica membranes modified with trifluoropropyl groups were synthesized by acid-catalyzed co-hydrolysis and polycondensation reaction of (3,3,3-trifluoropropyl)trimethoxysilane (TFPTMS) and bridged silsesquioxane 1,2-bis(triethoxysilyl)ethane (BTESE) as co-precursors. The effect of trifluoropropyl groups on the sol particle size and the hydrophobic property, the hydrogen permeation and separation behavior and the hydrothermal stability of the obtained membranes were investigated in detail. The results show that trifluoropropyl groups have been successfully incorporated onto the surface of membranes. The sol particle size decreases gradually and hydrophobic properties of the modified silica membranes are enhanced with increasing amount of TFPTMS in the mixture. When the molar ratio of TFPTMS/BTESE increases to 0.6, the organic-inorganic hybrid silica membranes exhibit water contact angles of 111.6°±0.7° and a narrow sol particle size distribution centered at 2.11 nm. The transport of hydrogen in the modified hybrid silica membranes complies with a micropore diffusion mechanism, with a high hydrogen permeance of 8.86×10-7 mol·m-2·s-1·Pa-1, a H2/CO2 permselectivity of 5.4, and a H2/CO2 binary gas (molar ratio＝1∶1) separation factor of 4.82 at 300 ℃, higher than the corresponding Knudsen value (H2/CO2＝4.69). The modified organic-inorganic silica membranes are hydrothermally stable while aging at a humid atmosphere with a temperature of 250 ℃ and a steam concentration of 5% for more than 300 hours.
Wang Xuewei , Wei Qi , Hong Zhifa , Li Qunyan , Nie Zuoren . Preparation, Gas Separation and Hydrothermal Stability Property of Organic-inorganic Hybrid Silica Membranes Modified by Trifluoropropyl Groups[J]. Acta Chimica Sinica, 2012 , 70(24) : 2529 -2535 . DOI: 10.6023/A12080568
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