Abstract
The adsorption and thermal decomposition of azomethane (AM) were investigated on oxides (SiO 2, TiO 2 and Al 2O 3) and on silica-supported noble metal (Pt/SiO 2, Pd/SiO 2 and Rh/SiO 2) catalysts by Fourier transform infrared (FT-IR) spectroscopy with concomitant mass spectroscopic monitoring of the gas phase. AM reacts readily with the surfaces of the catalysts to form chemisorbed species. It was demonstrated that AM chemisorbed in trans-form on SiO 2, and Pd/SiO 2, while on TiO 2, Al 2O 3, Pt/SiO 2 and Rh/SiO 2, the chemisorbed cis-AM was dominantly detected. OH groups of the oxides were also involved in binding of AM on the surfaces with the formation of H-bridged bonded species. Chemisorbed cis-AM suffered surface rearrangements, as its tautomerisation into formaldehyde methylhydrazone (CH 2NNHCH 3) was observed on catalysts adsorbing AM in cis-form. Depending on the forms of chemisorbed AM and their surface rearrangements, different products were detected in the gas phase during thermal annealing.
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