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Title: Selective Oxidation of Refractory Sulfur Compounds

Authors:
Publication Date:
Research Org.:
Merichem Company, Houston, TX
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
878304
Report Number(s):
DOE/ER/84393-Final Report
DOE Contract Number:
FG02-05ER84393
Type / Phase:
SBIR
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; refractory sulfur; catalysis; gasoline; octane

Citation Formats

Kittrell, Norman G. Selective Oxidation of Refractory Sulfur Compounds. United States: N. p., 2006. Web.
Kittrell, Norman G. Selective Oxidation of Refractory Sulfur Compounds. United States.
Kittrell, Norman G. Fri . "Selective Oxidation of Refractory Sulfur Compounds". United States. doi:.
@article{osti_878304,
title = {Selective Oxidation of Refractory Sulfur Compounds},
author = {Kittrell, Norman G},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 31 00:00:00 EST 2006},
month = {Fri Mar 31 00:00:00 EST 2006}
}

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  • A steady state energy balance is performed around a reactor for removing sulfur from coal by oxygen/water selective oxidation, or oxydesulfurization. Effects of reactor temperature, pressure, slurry feed concentration, and oxygen content of the feed gas on the thermal balance are investigated. Adiabatic operation of a commercial reactor is possible within the preferred range of operating conditions for at least one version of oxydesulfurization. Reactor temperature can be controlled in adiabatic operation of manipulation of slurry feed concentration, total pressure, and oxygen content of the feed gas. There are a number of advantages to operating an oxydesulfurization reactor adiabatically. Wastemore » heat is used in the most effective manner possible at its highest temperature, and to generate power. Adiabatic operation minimizes heat exchanger cost, since exchangers are used only as necessary to preheat the feed. Reactor temperature control by regulation of feed oxygen concentration and total pressure combines a fast response time with safety. Fine temperature control could be provided by variation of feed oxygen concentration and total pressure.« less
  • Elemental sulfur recovery from SO[sub 2]-containing gas streams is highly attractive as it produces a saleable. Product and no waste to dispose of. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO[sub 2] with coke) and Claus plants(reaction of SO[sub 2] with H[sub 2]S over catalyst). This project win investigate a cerium oxide catalyst for the single-stage selective reduction SO[sub 2] to elemental sulfur by a reductant, such as carbon monoxide. Cerium oxide has been identified as a superior catalyst for SO[sub 2] reduction by CO to elemental sulfurmore » because of its high activity and high selectivity to sulfur over COS over a wide temperature range(400--650C). Kinetic and parametric studies of SO[sub 2] reduction planned over various CeO[sub 2]-formulations will provide the necessary basis for development of a simplified process, a single-stage elemental sulfur recovery scheme from variable concentration gas streams. A first apparent application is treatment of regenerator off-gases in power plants using regenerative flue gas desulfurization. Such a simple catalytic converter may offer the long-sought Claus-alternative'' for coal-fired power plant applications.« less
  • Elemental sulfur recovery from SO{sub 2}-containing gas stream is highly attractive as it produces a salable product and no waste. However, commercially available schemes are complex and involve multi-stage reactors, such as, most notably in the Resox (reduction of SO{sub 2} with coke) and Claus plant (reaction of SO{sub 2} with H{sub 2}S over catalyst). This project will investigate a cerium oxide catalyst for the single stage selective reduction of SO{sub 2} to elemental sulfur by a reductant, such as carbon monoxide. Cerium oxide has been identified in recent work at MIT as a superior catalyst for SO{sub 2} reductionmore » by CO to elemental sulfur because its high activity and high selectivity to sulfur over COS over a wide temperature range (400-650{degrees}C). The detailed kinetic and parametric studies of SO{sub 2} reduction planned in this work over various CeO{sub 2}-formulations will provide the necessary basis for development of a very simplified process, namely that of a single-stage elemental sulfur recovery scheme from variable concentration gas streams. The potential cost- and energy-efficiency benefits from this approach cannot be overstated. A first apparent application is treatment of a regenerator off-gases in power plants using regenerative flue gas desulfurization. Such a simple catalytic converter may offer the long-sought {open_quotes}Claus-alternative{close_quotes} for coal-fired power plant applications.« less