Abstract
The reactivity of SiO 2, MoO 3/SiO 2 and V 2O 5/SiO 2 in the temperature range 400–800°C and at atmospheric pressure has been thoroughly investigated by temperature-programmed reaction (TPR) measurements obtaining a continuous sequence of conversion, product distribution and reaction rate data. The effect of the contact time (0.083 ≤ ι ≤ 0.332s) on the selectivity pattern and formaldehyde productivity (STY HCHO, g kg cat −1 h −1) has been assessed. The onset temperature of formaldehyde formation ( T o,HCHO) accounts well for the reactivity of oxide catalysts in the methane partial oxidation (MPO). For all the systems studied the same sequence of onset temperature of product formation: T o,HCHO < T o,CO < T o,CO 2 < T o,C 2 proves that formaldehyde is the primary product of MPO on silicabased oxide catalysts. A suitable procedure for the calculation of conversion-selectivity data is pointed out. Full agreement between TPR data and continuous flow (CFR) and batch reactor (BR) isothermal measurements was found. The suitability of the TPR method as a fast and reliable tool for testing oxide catalysts in MPO is assessed.
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