The involvement of carbon-centered radicals in the aging process of coals under atmospheric conditions: An EPR study

Tze'Ela Taub, Sharon Ruthstein, Haim Cohen

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Coal exposed to an air atmosphere absorbs the atmospheric oxygen; this involves physical adsorption and chemisorption to form surface oxides (including hydro-peroxides). These weathering processes, which are denoted as LTO (Low Temperature Oxidation), decrease the calorific value of the coal and emit different gases such as carbon oxides (CO, CO2), water vapor, hydrogen (H2), and also some low-molecular-weight organic gases (C1-5). Some of these gases are toxic and flammable. The mechanism by which the molecular oxygen interacts with the coal macromolecule is thought to occur in several steps. The main concept is that a chain of radical reactions takes place; however, the exact underlying mechanism is not yet clear. We succeeded in identifying various carbon-centered radical species, depending on the coal rank and the degree of oxidation and suggested a new scheme for the formation of radicals via the coal oxidation process.

Original languageEnglish
Pages (from-to)27025-27035
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number42
DOIs
StatePublished - 31 Oct 2018

Bibliographical note

Publisher Copyright:
© 2018 the Owner Societies.

Funding

This work was funded by an Israel Ministry of Science grant (#65101), awarded to Prof. Sharon Ruthstein.

FundersFunder number
Ministry of science and technology, Israel65101

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