Abstract
Formation of carbon coke on a manganese oxide (MnOx) catalyst surface during the exposure to methane at 700°C was studied by means of atomic force microscopy (AFM) imaging. Images collected before and after the reaction, showed significant changes in the catalyst surface morphology due to carbon coke formation. A carbonaceous deposit was successfully visualised at different stages of this formation. The early stages were in particular interesting in the case of the NaP-modified MnOx catalyst, which appears to be less sensitive towards in the case of the NaP-modified MnOx catalyst, which appears to be less sensitive towards deactivation due to carbon coke formation than the pure MnOx. Results from X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) showed that the catalyst coke mainly consists of CHx deposits and manganese carbide species.
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