Occurrence of carbon nanotubes and implication for the siting of elements in selected anthracites

FUEL

卷:263

Article

Silva, Luis F. O.¹  Crissien, Tito J.^1,2  Sampaio, Carlos H.³  Hower, James C.^4,5  Dai, Shifeng^6,7 

[1] Univ Costa, Dept Civil & Environm, CUC, Calle 58 55-66, Barranquilla, Atlantico, Colombia

[2] Univ Fed Rio Grande do Sul, PPGE3M, Porto Alegre, RS, Brazil

[3] Serra Hunter Prof Univ Politecn Catalunya Barcelo, Dept Engn Minera Ind & TIC, Av Bases Manresa 61-63, Barcelona 08242, Spain

[4] Univ Kentucky, Ctr Appl Energy Res, 2540 Res Pk Dr, Lexington, KY 40511 USA

[5] Univ Kentucky, Dept Earth & Environm Sci, Lexington, KY 40506 USA

[6] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Beijing, Peoples R China

[7] China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China

关键词: Rare earth elements;    Mercury;    Carbon nanotubes;    Coal rank;   

DOI  :  10.1016/j.fuel.2019.116740

来源: Elsevier

【 摘 要 】

Petrographic, geochemical, and electron microbeam investigations of selected anthracites and anthracite-rank coaly shales were conducted. The Pennsylvania, Rhode Island, and KwaZu-Natal anthracites show an enrichment in the middle to heavy rare earths (REE) while the Virginia semi-anthracite exhibited a decreasing trend through the light REE, a peak in Gd, and a depletion in the heavy REE. Substitution of As, Hg, and Se in pyrite was most apparent in the Virginia coal. The Pennsylvania, Rhode Island, and KwaZu-Natal anthracites contained spherical carbon nanotube (CNT) structures. The CNTs contained several elements, including Hg, Cd, F, Cl, and Br. While CNTs are known to be produced from coals of varying ranks, this seems to be the first report of naturally occurring CNTs.

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