Quantification of Silver Sites in Zeolites: Carbon Monoxide Sorption Monitored by IR Spectroscopy

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• 作者：Karolina Tarach ; Kinga G贸ra-Marek ; Magdalena Chrzan ; Stanis艂aw Walas
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：118
• 期：41
• 页码：23751-23760
• 全文大小：417K
• ISSN：1932-7455

文摘

This work was aimed to provide a well-established approach for the quantification of silver sites in zeolites. The experimental procedure based on carbon monoxide sorption in silver exchanged zeolites ZSM-5, Y, and X was monitored by IR spectroscopy. With regard to the Lambert鈥揃eer law the values of the absorption coefficients of the IR bands of CO interacting with exchangeable cations (Ag⁺) and metallic species (Ag⁰) were attained. Subsequently, the concentrations of silver species of different kinds were calculated. The values of the absorption coefficients are valid for zeolites of FAU and MFI topologies; thus, they are argued to be used for zeolites of other structures.