Surface acidity of H-birnessite: Infrared spectroscopic study of formic acid decomposition

EREN E., GÜMÜŞ H., EREN B., SARIHAN A.

Spectroscopy Letters, cilt.46, sa.1, ss.60-66, 2013 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 1
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1080/00387010.2012.666612
  • Dergi Adı: Spectroscopy Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.60-66
  • Anahtar Kelimeler: Birnessite, Manganese oxide, Mn 2O3, Mn 3O4, MnO2, Surface acidity
  • Bilecik Şeyh Edebali Üniversitesi Adresli: Evet

Özet

This paper presents the adsorption and thermal decomposition mechanism of formic acid on an H-birnessite sample. Changes in the surface and structure were characterized using infrared spectroscopy, N2 gas adsorption-desorption, and thermal analysis techniques. The acid sites of H-birnessite were investigated by infrared and thermal analysis using pyridine as a molecular probe. Decomposition of formic acid started on H-birnessite at 120°C and was complete at 400°C. Infrared spectra revealed that the molecularly adsorbed formic acid species were transformed to a formate species, and the formate species were transformed to CO. The most stable adsorption structure for formic acid was found as a molecular monodentate configuration. © 2013 Copyright Taylor and Francis Group, LLC.