Related Experiment Video
Updated: Jun 14, 2026

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
Published on: January 17, 2017
Interactions between tetrahydrothiophene (THT) and silver species in AgNa-Y
Eun Duck Park1, Sun Hee Choi, Doohwan Lee
1Division of Energy Systems Research and Division of Chemical Engineering and Materials Engineering, Ajou University, Wonchun-Dong, Yeongtong-Gu, Suwon, 443-749, Republic of Korea.
Abstract:
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.
Related Concept Videos
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Chemical Reactions in Aqueous Solutions
Precipitation Titration: Overview
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
Formation of Complex Ions
Preparation and Reactions of Thiols
Precipitation Titration Curve: Analysis

