Journal ArticleDOI
Determination of the total acidity of low-rank coals
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In this paper, the barium hydroxide exchange procedure for the determination of acidic groups in coals has been re-examined, using a wide range of low-rank coal samples (61.7-79.1% carbon d.m.f. basis).About:
This article is published in Fuel.The article was published on 1970-07-01. It has received 78 citations till now. The article focuses on the topics: Barium hydroxide & Barium.read more
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Separation and structural characterization of the value-added chemicals from mild degradation of lignites: A review
TL;DR: In this paper, a review of mild and eco-friendly utilization technologies for lignite is presented, focusing on mild (low moisture content, high ash yield, and low calorific value).
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Pyrolysis of brown coals. 1. Decomposition of acid groups in coals containing carboxyl groups in the acid and cation forms
TL;DR: The effect of low-temperature pyrolysis (up to 300 °C) on acid groups of two low-rank coals (a brown coal from Victoria, Australia, and a lignite from Texas, U.S.A.) has been studied for samples in both acid and cation forms.
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Dextrin adsorption by oxidized coal
TL;DR: In this paper, the authors investigated the role of physico-chemical factors that control the adsorption of dextrin by coal and found that the more hydrophobic demineralized coal was found to exhibit an adaption density twice the adsoption density of natural coal.
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Pyrolysis of brown coals. 2. Decomposition of acidic groups on heating in the range 100–900 °C
TL;DR: In this paper, the pyrolysis of a Yallourn brown coal in the acid form and several different cation forms has been studied at temperatures up to 900 °C, in regard to the decomposition of acid groups, the relation between oxygen products evolved and these groups, and the fate of cations.
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Low-temperature oxidation of brown coal. 3. Reaction with molecular oxygen at temperatures close to ambient
Philip D. Swann,David G. Evans +1 more
TL;DR: Yallourn brown coal was oxidized with pure molecular oxygen at temperatures of 35 and 70 °C until, after about 45 days, no further gain in mass occurred as mentioned in this paper, despite the loss of considerable quantities of carbon and hydrogen from the coal as carbon dioxide, carbon monoxide and water.
References
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690. Properties of ion-exchange resins in relation to their structure. Part I. Titration curves
N. E. Topp,K. W. Pepper +1 more
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Carboxyl groups and ion exchange in low-rank coals
TL;DR: In this article, the ion exchange properties of low-rank coals have been studied with a view to obtaining optimum conditions for the determination of carboxyl groups in the presence of phenolic groups.