A two-step method of crude phenol treatment from impurities, wherein a first step comprises oxidizing hydroxyacetone and aldehydes impurities, in phenol medium by air oxygen with the use of a heterogeneous catalyst which contains transition metals, and a second step comprises treating the unoxidized impurities with the use of a heterogeneous acidic catalyst. The separation of treatment by-products compounds produced during said phenol treatment may then be carried out by a conventional fractionation, distillation, or equivalent method, to produce highly purified product phenol.