An investigation of the catalytic decomposition of formic acid on raw and manganese oxide coated sepiolite surfaces

EREN E., GÜMÜŞ H., SARIHAN A.

Applied Clay Science, cilt.62-63, ss.1-7, 2012 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 62-63
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.clay.2012.04.013
  • Dergi Adı: Applied Clay Science
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1-7
  • Anahtar Kelimeler: γ-MnO 2, Formic acid, Mn 2O 3, Sepiolite, Thermal analysis
  • Bilecik Şeyh Edebali Üniversitesi Adresli: Evet

Özet

In this study, a mild chemical method was developed to synthesize manganese oxide coated sepiolite from RS, Mn(NO 3) 2 and H 2O 2 in an alkaline solution at room temperature. The samples were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared (IR) and thermal analysis (TA). After heating up to 600°C, the structure of the γ-MnO 2 phase gradually transformed into the Mn 2O 3 phase. TA indicated the transformation of γ-MnO 2 into Mn 2O 3 between 400 and 600°C. IR spectra of manganese oxides showed signature bands between 400 and 650cm -1 due to Mn-O lattice vibrations. The thermal desorption of pyridine was followed by IR and TA techniques to estimate the acidity of the samples. Decomposition of formic acid over RS and MCS was studied by IR spectroscopy at 100-400°C. Monodentate symmetric and asymmetric formates were observed after formic acid adsorption between 100 and 300°C. © 2012 Elsevier B.V.