Abstract
The influence of methanol at temperatures up to 420 °C on the surface of silica gel and Ag/SiO 2 was investigated by infrared spectroscopy in a vacuum apparatus. Experimental data (spectra and tables) are reported. The participation of the different types of hydroxyl group and siloxane bridge of silica gel (pretreated at 450 °C in vacuum) in the interaction with methanol is discussed and the stability of the resulting methoxy groups towards oxidation at elevated temperatures (100–420°C) is investigated. Moreover, the properties of silica gel used as a support for silver are compared with those of pure silica gel by differential spectral measurements. In addition to firmly bound surface complexes, weakly adsorbed compounds were also investigated after interaction at 100 and 400°C, in order to obtain better insight into interaction of methanol with Ag/SiO 2. The results were compared with literature data on the methanol-Fe, Co, Ni system, which has also been investigated by infrared spectroscopy.
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