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

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• 作者：E. Eren ; ^{erdal.eren@bilecik.edu.tr} ; H. Gumus ; A. Sarihan
• 关键词：Sepiolite ; 纬-MnO2 ; Mn2O3 ; Formic acid ; Thermal analysis
• 刊名：Applied Clay Science
• 出版年：2012
• 期刊代码：5_01691317
• 类别：ms
• 出版时间：July, 2012
• 卷：62-63
• 期：Complete
• 页码：1-7
• 文件大小：694 K

摘要

In this study, a mild chemical method was developed to synthesize manganese oxide coated sepiolite from RS, Mn(NO₃)₂ and H₂O₂ 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 掳C, the structure of the 纬-MnO₂ phase gradually transformed into the Mn₂O₃ phase. TA indicated the transformation of 纬-MnO₂ into Mn₂O₃ between 400 and 600 掳C. IR spectra of manganese oxides showed signature bands between 400 and 650 cm^鈭?#xA0;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 掳C. Monodentate symmetric and asymmetric formates were observed after formic acid adsorption between 100 and 300 掳C.