Liquid-phase oxidation of betulin over supported Ag NPs catalysts: Kinetic regularities, catalyst deactivation and reactivation

•Betulin oxidation with air over supported Ag NPs.•Kinetic regularities corresponds to the Langmuir-Hinshelwood mechanism.•Oxidizing environment and a relatively high temperature lead to significant changes in the catalyst.•Several reasons for catalyst deactivation.•Catalyst regeneration requires a two-step procedure.