Mechanistic Studies on Selective Adsorption of Thiophenic Compounds on TiO2-CeO2 Oxides

Open Access
Author:
Watanabe, Shingo
Graduate Program:
Energy and Geo-Environmental Engineering
Degree:
Doctor of Philosophy
Document Type:
Dissertation
Date of Defense:
December 04, 2006
Committee Members:
  • Chunshan Song, Committee Chair
  • Andre Louis Boehman, Committee Member
  • Sridhar Komarneni, Committee Member
  • Angela Lueking, Committee Member
Keywords:
  • desulfurization
  • adsorption
  • metal oxide
  • thiophene
  • CeO2
  • TiO2
Abstract:
The adsorption of thiophene in liquid hydrocarbons was investigated over TiO2-CeO2 oxide-based adsorbents. These adsorbents were characterized using a variety of techniques – x-ray diffraction, x-ray photoelectron spectroscopy and scanning electron microscope – and the kinetics of thiophene adsorption were subsequently examined. The primary goals were to elucidate which properties of the adsorbents influence selectivity, and to better understand the adsorption mechanism. Adsorption selectivity was quantified using model fuel analyzed by gas chromatography flame ionization detector (GC-FID), and the adsorption mechanism was probed through the use of ex-situ temperature programmed desorption and the use of in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).