High-Pressure Water Intrusion Investigation of Pure Silica RUB-41 and S-SOD Zeolite Materials

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• 作者：Mohamed Ali Saada ; Michel Soulard ; Bernd Marler ; Hermann Gies ; Jo毛l Patarin
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：January 20, 2011
• 年：2011
• 卷：115
• 期：2
• 页码：425-430
• 全文大小：298K
• 年卷期：v.115,no.2(January 20, 2011)
• ISSN：1932-7455

文摘

The energetic performance of two microporous siliceous materials, RUB-41 (RRO structure type) and S-SOD (SOD structure type) possessing medium-sized and very small pore openings, respectively, were studied using high-pressure water intrusion鈭抏xtrusion experiments at room temperature. The pressure鈭抳olume diagrams of the RUB-41 material indicate a partly reversible phenomenon showing a slight hysteresis at the extrusion stage, which reveals that the water鈭?RUB-41 system displays a shock-absorber behavior. Moreover, a shift toward the low pressure range was detected between the first cycle of water intrusion and the second one, indicating the creation of new defect sites in the inorganic framework after the intrusion process. Several investigations, mainly by p>29p>Si solid-state NMR spectroscopy, confirm this observation. For the S-SOD material, no water intrusion was observed after three water intrusion鈭抏xtrusion cycles. The highly hydrophobic character of the S-SOD material with its small pore opening or the value of the capillary pressure, which exceeds that tolerated by the instrument, are probably the two reasons for this result.