Formation and characterization of humic acids from low rank anatolian coals by air oxidation

Erdogan S., Duz M., MERDİVAN M., Hamamci C.

ENERGY SOURCES, cilt.27, sa.5, ss.423-430, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 5
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1080/00908310490441827
  • Dergi Adı: ENERGY SOURCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.423-430
  • Anahtar Kelimeler: characterization, coal, humic acid, SUBBITUMINOUS COALS, BROWN-COAL, LIGNITES, SUBSTANCES, GROWTH, SOIL
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The results of this study are aimed at evaluating the effects of air oxidation time, temperature and demineralization on humic acid production from two low-rank Anatolian coals. Two Anatolian low rank coals were studied at 120 and 200degreesC up to 10 days with and without demineralization. The best results for humic acid formation were obtained at a high temperature for longer times. Demineralization effect is negligible for studied coals. The rate of humic acid formation increased at first with increase in oxidation time, reached a maximum, and then decreased at high oxidation time. Also, a detailed study of the elemental composition, the characterization by FTIR, and the acidity of humic acids are reported.