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Interactions Between Tetrahydrothiophene (THT) and Silver Species in AgNa-Y

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We studied the interaction between tetrahydrothiophene (THT), which is one of sulfur odorants in a pipeline natural gas, and AgNa-Y zeolites, which can be obtained via Ag+ exchange with Na+ of Na-Y and used for the adsorptive removal of THT at ambient temperature and atmospheric pressure, with a temperature-programmed desorption (TPD), a temperature-programmed reduction with H2 (H2-TPR), a transmission electron microscopy (TEM) with an energy dispersive X-ray spectroscopy (EDX) and an X-ray absorption fine structure (XAFS). The presence of the metallic Ag and the Ag+ in the fresh AgNa-Y can be supported with a TEM and an XAFS analysis. The fraction of metallic Ag in silver species increased with increasing the pretreatment temperature. The formation of Ag–S bond with concomitant decreasing the interaction between Ag+ and oxygen in the lattice as well as the interaction of Ag–Ag in the metallic Ag can be observed during the adsorption of THT at ambient temperature. This can explain why there is no noticeable difference in the adsorption capacity in between Ag+-dominant AgNa-Y and Ag0-rich AgNa-Y. This Ag–S bond was transformed into the Ag–Ag bond during the heat treatment in an inert gas above 673 K. However, the fresh chemical and electronic state of Ag can be recovered after the heat treatment in air above 673 K.
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Keywords: ADSORPTION; AG-Y; DESULFURIZATION; NA-Y; TETRAHYDROTHIOPHENE; XAFS

Document Type: Research Article

Publication date: 2010-01-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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