Surface characteristics and surface behaviour of polymer carbons—V
Identifieur interne : 005218 ( Main/Exploration ); précédent : 005217; suivant : 005219Surface characteristics and surface behaviour of polymer carbons—V
Auteurs : R. C. Bansal [Inde] ; T. L. Dhami [Inde] ; Sat Parkash [Canada]Source :
- Carbon [ 0008-6223 ] ; 1980.
Abstract
Interaction of polymer charcoals with bromine in aqueous solutions results in the conversion of bromine into HBr and its fixation by the charcoals. The amount of bromine converted into HBr is related to the surface acidity of the char while the amount fixed depends upon the nature of the char and the history of its formation. PVDC and Saran charcoals adsorb appreciably larger amounts of bromine than PF and UF charcoals prepared at the same temperature. The adsorption decreases on outgassing the chars at 1000°C and the decrease is only slight in case of PVDC and Saran chars. The adsorption of bromine involves two different mechanisms. In case of the highly porous charcoals such as those of PVDC and Saran prepared by the carbonisation of oxygen free polymers, the adsorption of bromine occurs largely in pores. In the case of less porous charcoals such as those of PF and UF prepared by the carbonisation of oxygen containing polymers, the adsorption of bromine takes place partly by addition at the unsaturated sites and partly by substitution in place of bonded hydrogen.
Url:
DOI: 10.1016/0008-6223(80)90030-5
Affiliations:
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C." last="Bansal">R. C. Bansal</name><affiliation wicri:level="1"><country xml:lang="fr">Inde</country><wicri:regionArea>Department of Chemistry, Panjab University, Chandigarh 160014</wicri:regionArea><wicri:noRegion>Chandigarh 160014</wicri:noRegion></affiliation></author><author><name sortKey="Dhami, T L" sort="Dhami, T L" uniqKey="Dhami T" first="T. L." last="Dhami">T. L. Dhami</name><affiliation wicri:level="1"><country xml:lang="fr">Inde</country><wicri:regionArea>Department of Chemistry, Panjab University, Chandigarh 160014</wicri:regionArea><wicri:noRegion>Chandigarh 160014</wicri:noRegion></affiliation></author><author><name sortKey="Parkash, Sat" sort="Parkash, Sat" uniqKey="Parkash S" first="Sat" last="Parkash">Sat Parkash</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Fuel Sciences Division, Research Council of Alberta Edmonton, Alberta</wicri:regionArea><wicri:noRegion>Alberta</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Carbon</title><title level="j" type="abbrev">CARBON</title><idno type="ISSN">0008-6223</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1980">1980</date><biblScope unit="volume">18</biblScope><biblScope unit="issue">6</biblScope><biblScope unit="page" from="395">395</biblScope><biblScope unit="page" to="398">398</biblScope></imprint><idno type="ISSN">0008-6223</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0008-6223</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Interaction of polymer charcoals with bromine in aqueous solutions results in the conversion of bromine into HBr and its fixation by the charcoals. The amount of bromine converted into HBr is related to the surface acidity of the char while the amount fixed depends upon the nature of the char and the history of its formation. PVDC and Saran charcoals adsorb appreciably larger amounts of bromine than PF and UF charcoals prepared at the same temperature. The adsorption decreases on outgassing the chars at 1000°C and the decrease is only slight in case of PVDC and Saran chars. The adsorption of bromine involves two different mechanisms. In case of the highly porous charcoals such as those of PVDC and Saran prepared by the carbonisation of oxygen free polymers, the adsorption of bromine occurs largely in pores. In the case of less porous charcoals such as those of PF and UF prepared by the carbonisation of oxygen containing polymers, the adsorption of bromine takes place partly by addition at the unsaturated sites and partly by substitution in place of bonded hydrogen.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Inde</li></country></list><tree><country name="Inde"><noRegion><name sortKey="Bansal, R C" sort="Bansal, R C" uniqKey="Bansal R" first="R. C." last="Bansal">R. C. Bansal</name></noRegion><name sortKey="Dhami, T L" sort="Dhami, T L" uniqKey="Dhami T" first="T. L." last="Dhami">T. L. Dhami</name></country><country name="Canada"><noRegion><name sortKey="Parkash, Sat" sort="Parkash, Sat" uniqKey="Parkash S" first="Sat" last="Parkash">Sat Parkash</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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