HydrocarbonChemMechLect6ME525SP2011

HydrocarbonChemMechLect6ME525SP2011 - ME 525: Combustion...

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ME 525: Combustion Lecture 6: Hydrocarbon Chemical Mechanisms Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University West Lafayette, Indiana Lucht@purdue.edu , 765-494-5623 (Phone) () January 27, 2011 School of Mechanical Engineering, Purdue University
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Lecture Topics Carbon monoxide oxidation mechanism. ethane oxidation mechanism. Methane oxidation mechanism. xidation of higher lkanes araffins Oxidation of higher alkanes (paraffins). School of Mechanical Engineering, Purdue University
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Carbon Monoxide Oxidation Mechanism Oxidation of CO in the absence of any hydrogen- containing material is extremely slow, postulated echanisms involving ozone and excited carbon mechanisms involving ozone and excited carbon dioxide (CO 2 *) are still in dispute. In the presence of small amounts of water vapor,   22 1 1( ) k CO O CO O slow    2 2 2 k OH O O HO H    2 2 3 4 3 4 k CO OH CO H k O School of Mechanical Engineering, Purdue University
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Carbon Monoxide Oxidation Mechanism the presence of hydrogen the following steps are • In the presence of hydrogen the following steps are also important: k H HO H    2 22 5 6 5 6 OH k OH H H H O     • At high pressures or in the initial stages of hydrocarbon oxidation the oxidation of CO by the hydroperperoxyl radical may also be important,   7 7 k CO HO CO OH School of Mechanical Engineering, Purdue University
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Carbon Monoxide Oxidation Mechanism 3 is an extremely important reaction in hydrocarbon R3 is an extremely important reaction in hydrocarbon combustion, usually responsible for nearly all of the oxidation of CO to give CO 2 . This is a very complex "elementary" reaction that exhibits some pressure dependence (activated complex has a significant fetime). lifetime).  2 3 3 k CO OH CO H    School of Mechanical Engineering, Purdue University
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Carbon Monoxide Oxidation Mechanism • Rate of reaction of OH with CO is much less than the rate of reaction of OH with HCs (Table 2, Westbrook and Dryer).
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This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue University-West Lafayette.

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HydrocarbonChemMechLect6ME525SP2011 - ME 525: Combustion...

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