Surface acidity of H-birnessite: Infrared spectroscopic study of formic acid decomposition
Spectroscopy Letters, vol.46, no.1, pp.60-66, 2013 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 46 Issue: 1
- Publication Date: 2013
- Doi Number: 10.1080/00387010.2012.666612
- Journal Name: Spectroscopy Letters
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.60-66
- Keywords: Birnessite, Manganese oxide, Mn 2O3, Mn 3O4, MnO2, Surface acidity
- Bilecik Şeyh Edebali University Affiliated: Yes
Abstract
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.