A new kinetic model for the NO–carbon reaction

The kinetics of the NO–carbon reaction was studied by thermogravimetric analysis (TGA). The reactivity as a function of carbon conversion was systematically investigated through characterization of the pore structure and carbon active site evolution during reaction. Total surface area measured by CO...

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Bibliographic Details
Published in:Chemical engineering science 1999-10, Vol.54 (19), p.4125-4136
Main Authors: Li, Y.H., Radovic, L.R., Lu, G.Q., Rudolph, V.
Format: Article
Language:English
Subjects:
Carbon active sites
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetic model
Kinetics
Kinetics and mechanism of reactions
NO–carbon reaction
Pore structure
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Summary:The kinetics of the NO–carbon reaction was studied by thermogravimetric analysis (TGA). The reactivity as a function of carbon conversion was systematically investigated through characterization of the pore structure and carbon active site evolution during reaction. Total surface area measured by CO 2 adsorption at 273 K gives a relatively constant normalized reactivity over a wide range of carbon conversions. The carbon active surface area (ASA) and unoccupied active surface area (UASA) were estimated from low-temperature NO chemisorption capacities. Large amounts of stable C–O complexes are found to form during the reaction. Results show that ASA or UASA measured in this way do not represent the reactive surface area under gasification conditions. A new kinetic model is introduced by taking into account the contributions from different carbon–oxygen surface complexes during reaction, based on the recently proposed unified kinetic scheme of Yang and coworkers.
ISSN:0009-2509
1873-4405
DOI:10.1016/S0009-2509(99)00121-9