Journal ArticleDOI
Observation of transient free radicals during coal pyrolysis
TLDR
In this article, electron spin resonance studies of the early stages of carbonization of a high-volatile A bituminous coal have been used to detect and quantify transient free radicals present in the coal pyrolysate.About:
This article is published in Fuel.The article was published on 1983-04-01. It has received 47 citations till now. The article focuses on the topics: Carbonization & Coal.read more
Citations
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Journal ArticleDOI
Pyrolysis of Coals and Biomass: Analysis of Thermal Breakdown and Its Products
Journal ArticleDOI
Role of Chain Reactions and Olefin Formation in Cracking, Hydroconversion, and Coking of Petroleum and Bitumen Fractions
TL;DR: In this article, a consistent mechanism for cracking of residues based on the known chemistry of free-radical chain reactions and model compounds is presented. But the mechanism of cracking of distillate fractions is well-known, the reactions that underlay conversion of the residue fractions of petroleum and bitumen are not well defined.
Journal ArticleDOI
Overview of commonly used materials for coal spontaneous combustion prevention
TL;DR: In this article, a review of commonly used retardants for coal spontaneous combustion (CSC) prevention is presented, based upon the necessary conditions required for CSC and coal−−oxygen reaction mechanism, various materials used in CSC inhibition are analysed in detail and classified into physical-based, chemical-based and composite retardants.
Journal ArticleDOI
Electron spin resonance studies of coals and coal conversion processes: A review
TL;DR: In this paper, a review of electron spin resonance (ESR) studies in coal research from 1954 to now, with emphases on research advancements in this century, is provided, including ESR studies on other heavy organic matters such as biomass and oil shale, because their reactions are similar in principle with coal reactions.
Journal ArticleDOI
Quantitative Investigation of Free Radicals in Bio‐Oil and their Potential Role in Condensed‐Phase Polymerization
TL;DR: Pyrolytic lignin had the highest concentration in free radicals, which could be a combination of carbon-centered (benzyl radicals) and oxygen- centered (phenoxy radicals) organic species because they are delocalized in a π system.
References
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Journal ArticleDOI
Fragmentations and rearrangments of free radical intermediates during hydroliquefaction of coals in hydrogen donor media
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Some Cautionary Notes on ESR and ENDOR Measurements in Coal Research
TL;DR: In this paper, the authors investigated the effect of dilution of high-rank coals and heat-treated coals with a nonconducting medium on the results of electron spin resonance (ESR) and nuclear double resonance (ENDOR) spectroscopy.
Journal ArticleDOI
Letter to the editorEffect of chloroform-solubles in coal conversion in non-hydrogen-donating solvents☆
Journal ArticleDOI
Free radicals in coal and coal conversions. 5. Methodology for the in-situ investigation of free radicals in coal depolymerization under SRC-II preheater/reactor conditions
TL;DR: In this article, a uniquely designed electron spin resonance (e.s.r.) cavity allows the monitoring of free radicals and how they are affected by residence time, temperature and pressure changes.
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Low temperature processes in a bituminous coal studied by in situ electron spin resonance spectroscopy
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