The density functional method was used to study vibrational frequencies of the surface species involved in the reaction of the methanol dehydration via pathway CH₃OH→CH₃O→CH₂O→CHO→СО on a ideal Pt(111) surface and surface of nanoparticle Pt₇₉. Connection of spectral features with stability and coordination of the adsorbed molecules was discussed. The determined vibrational features enable identification of the main reaction intermediates.