Type of Document Major Paper Author Liu, Dongxing Author's Email Address dliu11@lsu.edu, liudongxing@gmail.com URN etd-06032010-071804 Title Catalytic Oxidative Desulfurization of a Model Diesel Degree Master of Science in Chemical Engineering (M.S.Ch.E.) Department Chemical Engineering Advisory Committee
Advisor Name Title Dooley, Kerry M. Committee Chair Knopf, F. Carl Committee Co-Chair Pike, Ralph W. Committee Member Keywords
- N-heterocycles oxdiation with oxygen
- S-heterocycles oxidation with oxygen
Date of Defense 2010-05-07 Availability unrestricted Abstract An analysis of heterogeneous oxidation catalysts was performed to determine theactivities and optimal operating conditions for the multiphase oxidative desulfurization
(ODS) reactions, using a model diesel. Catalysts studied included well-characterized Pd on
Al2O3 and activated carbon supports, and carbon-supported Mo2C and W2C, which were
prepared by temperature programmed reaction. Several other typical oxidation catalysts were
also examined.
The model diesel consisted of ~1 wt% sulfur compounds (thiophene and
dibenzothiophene) with appropriate amounts of aliphatic, alkylaromatic and N-heterocyclic
compounds to simulate a raw number 2 diesel. With oxygen as the oxidant in ODS reactions
of this model diesel (70-90ºC, 0.8-1.8 MPa, feed vol/wt cat. = 100 mL/g), Pd/C and Mo2C/C
showed the best selectivity for oxidizing the N- and S-heterocycles vs. the alkylaromatics.
Increasing the pressure increased the reaction rates of the N- and S-heterocycles. Except for
thiophene, there was only a small dependence of observed rates on temperature, which
suggests the reactions were partially diffusion (of O2) controlled. The optimal ODS catalysts
(carbides and 5%Pd/MPT-5) also showed high activity for the conversion of N-heterocycles.
Current work includes further investigations of the better catalysts, full characterization
of the products by GC-MS, and kinetics measurements using catalyst monoliths in a pistonoscillating
reactor, which can eliminate the diffusion limitations and provide a uniform
hydrodynamic environment.
Files
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access Liuthesis.pdf 598.37 Kb 00:02:46 00:01:25 00:01:14 00:00:37 00:00:03
If you have questions or technical problems, please Contact LSU-ETD Support.