Publication: Atmospheric hydrodesulfurization of diesel fuel using Pt/Al2O3 catalysts prepared by supercritical deposition for fuel cell applications
Program
KU-Authors
KU Authors
Co-Authors
Haji, Shaker
Zhang, Ying
Advisor
Publication Date
2010
Language
English
Type
Journal Article
Journal Title
Journal ISSN
Volume Title
Abstract
Hydrodesulfurization (HDS) of low-sulfur model and commercial diesel fuel (500 ppmw 5) using Pt/Al2O3 catalysts prepared by supercritical carbon dioxide (scCO(2)) deposition method is investigated at atmospheric pressure and in temperature range of 290-350 degrees C. The reactivity of the investigated organosulfur compounds followed the known trend, that is: BT > 2-MDBT > DBT >> 4-MDBT > 4.6-DMDBT, despite the nonconventional operating conditions and catalyst. The HDS of dibenzothiophenes was found to proceed only via the direct desulfurization route (C-S bond scission) under the studied conditions whereas HDS at high H-2 pressure proceeds via both direct desulfurization and hydrogenation routes. This limitation had several consequences. Under atmospheric pressure, the HDS reaction exhibited low reactivity particularly towards the stericly hindered substituted dibenzothiophenes. HDS of commercial diesel at atmospheric pressure using catalyst prepared by supercritical fluid deposition technique was found to be feasible, however, the catalyst had to have high metal loading and the reactor had to be operated under high H-2/fuel ratio with low hourly space velocity. (c) 2009 Elsevier B.V. All rights reserved.
Description
Source:
Applied Catalysis A-General
Publisher:
Keywords:
Subject
Chemistry, Physical, Materials science, Engineering, Metallurgy metallurgical engineering