Chemical forms and distribution of naturally occurring calcium in brown coal chars.
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| Title: | Chemical forms and distribution of naturally occurring calcium in brown coal chars. |
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| Authors: | Kuznetsov, Peter N.1 kuzpn@icct.ru, Kuznetsova, Ludmila I.1, Mikhlin, Yury L.1 |
| Source: | Fuel (0016-2361). Dec2015, Vol. 162, p207-210. 4p. |
| Subjects: | Lignite, Char, Surface chemistry, Carbonization, Coal gasification |
| Abstract: | The reactivity of brown coal chars for low temperature steam gasification and the chemical forms and distribution of the naturally occurring calcium species between the bulk and the surface of chars and the evolution on carbonization and steam gasification were studied in this paper. The char surface was shown to be significantly enriched with calcium compared to bulk matter. Aragonite-like species were identified on the surface before char gasification, however they readily converted into the calcite-like ones under gasification conditions. Both forms of calcium carbonate species occurred in the nano-sized nucleus, neither of which was detected by XRD. The conclusion was made that these were highly dispersed calcite-like surface species derived from the aragonite-like ones under steam gasification conditions, which would be responsible for the catalysis of char gasification. [ABSTRACT FROM AUTHOR] |
| Copyright of Fuel (0016-2361) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 110127799 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Chemical forms and distribution of naturally occurring calcium in brown coal chars. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kuznetsov%2C+Peter+N%2E%22">Kuznetsov, Peter N.</searchLink><relatesTo>1</relatesTo><i> kuzpn@icct.ru</i><br /><searchLink fieldCode="AR" term="%22Kuznetsova%2C+Ludmila+I%2E%22">Kuznetsova, Ludmila I.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mikhlin%2C+Yury+L%2E%22">Mikhlin, Yury L.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Fuel+%280016-2361%29%22">Fuel (0016-2361)</searchLink>. Dec2015, Vol. 162, p207-210. 4p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lignite%22">Lignite</searchLink><br /><searchLink fieldCode="DE" term="%22Char%22">Char</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonization%22">Carbonization</searchLink><br /><searchLink fieldCode="DE" term="%22Coal+gasification%22">Coal gasification</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The reactivity of brown coal chars for low temperature steam gasification and the chemical forms and distribution of the naturally occurring calcium species between the bulk and the surface of chars and the evolution on carbonization and steam gasification were studied in this paper. The char surface was shown to be significantly enriched with calcium compared to bulk matter. Aragonite-like species were identified on the surface before char gasification, however they readily converted into the calcite-like ones under gasification conditions. Both forms of calcium carbonate species occurred in the nano-sized nucleus, neither of which was detected by XRD. The conclusion was made that these were highly dispersed calcite-like surface species derived from the aragonite-like ones under steam gasification conditions, which would be responsible for the catalysis of char gasification. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Fuel (0016-2361) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.fuel.2015.09.015 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 207 Subjects: – SubjectFull: Lignite Type: general – SubjectFull: Char Type: general – SubjectFull: Surface chemistry Type: general – SubjectFull: Carbonization Type: general – SubjectFull: Coal gasification Type: general Titles: – TitleFull: Chemical forms and distribution of naturally occurring calcium in brown coal chars. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kuznetsov, Peter N. – PersonEntity: Name: NameFull: Kuznetsova, Ludmila I. – PersonEntity: Name: NameFull: Mikhlin, Yury L. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 12 Text: Dec2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 00162361 Numbering: – Type: volume Value: 162 Titles: – TitleFull: Fuel (0016-2361) Type: main |
| ResultId | 1 |
