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M. Sobkowiak and P. C. Painter, “Determination of the Aliphatic and Aromatic CH Contents of Coals by FT-i.r.: Studies of Coal Extracts,” Fuel, Vol. 71, No. 10, 1992, pp. 1105-1125. doi:10.1016/0016-2361(92)90092-3

has been cited by the following article:

• TITLE: Study of Changes to the Organic Functional Groups of a High Volatile Bituminous Coal during Organic Acid Treatment Process by FTIR Spectroscopy

  AUTHORS: B. Manoj, Ponni Narayanan

  KEYWORDS: Leaching; Bituminous Coal; Minerals; FTIR

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.1 No.2, March 28, 2013

  ABSTRACT: A high volatile bituminous coal was subjected to a series of organic acid treatment in steps using citric acid (1 hr and 2 hr) and buffered EDTA with acetic acid (1 to 3 hr) at room temperature. Leaching was performed with acetic acid (2N) also for 1 hr. Citric acid procedure reduced the mineral matter below 1.94%. Calcites and aluminates are completely removed along with substantial quantity of silicates by citric acid leaching. The change in absorption of organic functional groups and mineral matter in coal samples were studied using Fourier transform infrared spectroscopy (FTIR). Analysis indicated that oxygen containing species were decreased in the coal structure during acetic acid and citric acid (40%) procedure and buffered EDTA 3 hours leaching. As the period of leaching with buffered EDTA increased from 1 hr to 3 hr, organic functional groups and mineral functional groups decreased its intensity. The results indicated that the described acid treatment procedures with citric acid have measurable effects on the coal structure.