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Analysis of institutional authors

Gomez-Limon, DAuthor
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The influence of nitric acid oxidation of low rank coal and its impact on coal structure

Publicated to:Fuel. 82 (15-17): 2007-2015 - 2003-10-01 82(15-17), DOI: 10.1016/S0016-2361(03)00176-5

Authors: Alvarez, R; Clemente, C; Gomez-Limon, D;

Affiliations

Univ Politecn Madrid, ETS Ingn Minas, Madrid 28003, Spain - Author

Abstract

FT-i.r. was used to examine the behaviour of a Spanish lignite during its oxidative treatment with nitric acid with a view to assessing the different forms of sulphur reduction and the changes produced in the coal structure, as a result of the action of the reagent. Inorganic sulphur decreases rapidly and practically disappears, even under mild attack conditions (50 degreesC, 20% acid concentration). At first, organic sulphur undergoes a rapid decrease but more energetic conditions are required to maintain the reduction. Reduction may even reach 53% under such conditions. Unfortunately, energetic attacks (90 degreesC) lead to a high-level of coal organic matter solubilization and an increase in oxygen content. Basically, the oxygen appears as carbonyl group within the desulphurized coal. The nitric acid causes effective nitration of the coal, the nitrogen being incorporated especially as aromatic nitrogen. The substitution is easily produced (50 degreesC) when there are two adjacent aromatic hydrogens per ring. The isolated hydrogens in aryl- or polycyclic aromatic structures, are more resistant to attack under mild conditions but not so at 90 degreesC. As nitration progresses, more electrophilic molecules appear and aliphatic hydrogen tends to increase after initially decreasing under mild attack and increases more so under more energetic condition. This aliphatic hydrogen compensates for the decrease in aromatic hydrogen. (C) 2003 Elsevier Ltd. All rights reserved.

Keywords
CoalDesulphurizationHydrogenLow rankNitric acidStructureSulfur distribution

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Fuel due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2003, it was in position 11/62, thus managing to position itself as a Q1 (Primer Cuartil), in the category Energy & Fuels.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 13.73, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Apr 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-04-12, the following number of citations:

  • WoS: 78
  • Scopus: 104
  • OpenCitations: 81
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-04-12:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 31.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 30 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 3.
Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: Last Author (GOMEZ-LIMON GALINDO, DULCE NOMBRE DE M.).