Abstraction of Hydrogen from Methanol by Hydroxyl Radical in Subcritical and Supercritical Water

Autor:	Sudhir N. V. K. Aki, Joan F. Brennecke, Junbo Feng, John E. Chateauneuf
Rok vydání:	2003
Předmět:	Arrhenius equation Supercritical water oxidation Hydrogen chemistry.chemical_element Photochemistry Hydrogen atom abstraction Supercritical fluid chemistry.chemical_compound symbols.namesake chemistry Radiolysis symbols Hydroxyl radical Methanol Physical and Theoretical Chemistry
Zdroj:	The Journal of Physical Chemistry A. 107:11043-11048
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp036179s
Popis:	Reactions involving hydrogen abstraction by hydroxyl radical are an important class of reactions in subcritical and supercritical oxidation in water. However, the rates of individual hydrogen abstraction reactions are not available in the literature at the high temperatures and pressures necessary for near-critical or supercritical water oxidation. Here we present the measurements of the hydrogen abstraction from methanol by hydroxyl radical in water at temperatures from ambient to 390 °C and at 250 bar. •OH was generated by pulse radiolysis and the kinetics determined by monitoring the growth of the nitrohydroxycyclohexadienyl radical. The measured bimolecular rate constants show Arrhenius temperature dependence from ambient temperature through the supercritical region. The experimental rate constants for hydrogen abstraction from methanol by hydroxyl radical are significantly higher than the values used by a variety of researchers who have attempted to model oxidation of methanol in supercritical water ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::55f323d3a6e78a871d61737b336d3c63 https://doi.org/10.1021/jp036179s Zobrazit plný text záznamu