Partial oxidation (POX) is a type of chemical reaction. It occurs when a substoichiometric fuel-air mixture is partially combusted in a reformer, creating a hydrogen-rich syngas which can then be put to further use, for example in a fuel cell. A distinction is made between thermal partial oxidation (TPOX) and catalytic partial oxidation (CPOX).
Partial oxidation is a technically mature process in which natural gas or a heavy hydrocarbon fuel (heating oil) is mixed with a limited amount of oxygen in an exothermic process. [1]
General reaction:
Idealized reaction for heating oil:
Idealized reaction for coal:
The formulas given for coal and heating oil show only a typical representative of these complex fuels. Water may be added to lower the combustion temperature and reduce soot formation. Yields are below stoichiometric due to some fuel being fully combusted to carbon dioxide and water.[citation needed]
TPOX
TPOX (thermal partial oxidation) reaction temperatures are dependent on the air-fuel ratio or oxygen-fuel ratio. Typical reaction temperatures are 1200°C and above.[citation needed]
CPOX
In CPOX (catalytic partial oxidation) the use of a catalyst reduces the required temperature to around 800°C – 900°C.[citation needed]
The choice of reforming technique depends on the sulfur content of the fuel being used. CPOX can be employed if the sulfur content is below 50 ppm. A higher sulfur content can poison the catalyst, so the TPOX procedure is used for such fuels. However, recent research shows that CPOX is possible with sulfur contents up to 400ppm.[2]
^Hornback, Joseph. Organic Chemistry. Brooks/Cole, Cengage Learning. pp. 146–147. ISBN978-0-534-38951-2.
^Electricity from wood through the combination of gasification and solid oxide fuel cells, Ph.D. Thesis by Florian Nagel, Swiss Federal Institute of Technology Zurich, 2008
partial, oxidation, type, chemical, reaction, occurs, when, substoichiometric, fuel, mixture, partially, combusted, reformer, creating, hydrogen, rich, syngas, which, then, further, example, fuel, cell, distinction, made, between, thermal, partial, oxidation, . Partial oxidation POX is a type of chemical reaction It occurs when a substoichiometric fuel air mixture is partially combusted in a reformer creating a hydrogen rich syngas which can then be put to further use for example in a fuel cell A distinction is made between thermal partial oxidation TPOX and catalytic partial oxidation CPOX Contents 1 Principle 2 TPOX 3 CPOX 4 History 5 See also 6 ReferencesPrinciple EditPartial oxidation is a technically mature process in which natural gas or a heavy hydrocarbon fuel heating oil is mixed with a limited amount of oxygen in an exothermic process 1 General reaction C n H m n 2 O 2 n CO m 2 H 2 displaystyle ce C mathit n H mathit m frac mathit n 2 O2 gt mathit n CO frac mathit m 2 H2 Idealized reaction for heating oil C 12 H 24 6 O 2 12 CO 12 H 2 displaystyle ce C12H24 6O2 gt 12CO 12H2 Idealized reaction for coal C 24 H 12 12 O 2 24 CO 6 H 2 displaystyle ce C24H12 12O2 gt 24CO 6H2 The formulas given for coal and heating oil show only a typical representative of these complex fuels Water may be added to lower the combustion temperature and reduce soot formation Yields are below stoichiometric due to some fuel being fully combusted to carbon dioxide and water citation needed TPOX EditTPOX thermal partial oxidation reaction temperatures are dependent on the air fuel ratio or oxygen fuel ratio Typical reaction temperatures are 1200 C and above citation needed CPOX EditIn CPOX catalytic partial oxidation the use of a catalyst reduces the required temperature to around 800 C 900 C citation needed The choice of reforming technique depends on the sulfur content of the fuel being used CPOX can be employed if the sulfur content is below 50 ppm A higher sulfur content can poison the catalyst so the TPOX procedure is used for such fuels However recent research shows that CPOX is possible with sulfur contents up to 400ppm 2 History Edit1926 Vandeveer and Parr at the University of Illinois used oxygen to replace air 3 See also EditHydrogen production Industrial gas PROX Small stationary reformer Glossary of fuel cell terms Timeline of hydrogen technologiesReferences Edit Hornback Joseph Organic Chemistry Brooks Cole Cengage Learning pp 146 147 ISBN 978 0 534 38951 2 Electricity from wood through the combination of gasification and solid oxide fuel cells Ph D Thesis by Florian Nagel Swiss Federal Institute of Technology Zurich 2008 Industrial Gas Handbook Frank G Kerry p 230 Retrieved from https en wikipedia org w index php title Partial oxidation amp oldid 1077280084, wikipedia, wiki, book, books, library,
