NOVELTY - A selective oxidation catalyst comprises transition metal-alkali metal-octahedral molecular sieve (I).    USE - Selective oxidation catalyst is used in base-free green process (claimed), and used for converting renewable biomass into fuels and chemicals, and used in food industry, water treatment, manufacture of paper and pulp, and pharmaceutical industry.    ADVANTAGE - The selective oxidation catalyst has excellent stability, activity, selectivity and recyclability, and is environmentally-friendly manufactured with high yield in a short period of time.    DETAILED DESCRIPTION - A selective oxidation catalyst comprises transition metal-alkali metal-octahedral molecular sieve of formula: A-B-OMS (I).    A=metal chosen from ruthenium, gold, platinum, palladium, rhodium, osmium, nickel, cobalt and copper;    B'=potassium, sodium, lithium, rubidium, cesium, magnesium, calcium, strontium and barium;and    OMS=octahedral molecular sieve chosen from synthetic todorokite (OMS-1) and K-cryptomelane (OMS-2).    INDEPENDENT CLAIMS are included for the following:    (1) preparation of transition metal-alkali metal-octahedral molecular sieve catalyst, which involves ion-exchanging of sodium-buserite with metal salt (B) by stirring at 25-35 degrees C for 12-36 hours, adding solution of metal salt (B), heating at 120-160 degrees C for 24-48 hours to obtain B-OMS, stirring the product with metal salt (A) at 60-100 degrees C for 2-4 hours, cooling, adding reducing agent chosen from sodium borohydride and lithium aluminum hydride and stirring at 30-40 degrees C for 1-3 hours; and    (2) base-free green process for selective oxidation in presence of transition metal-alkali metal-octahedral molecular sieve catalyst involves charging 0.5-5 mmol reactant, water and transition metal-alkali metal-octahedral molecular sieve catalyst in a reactor, heating at 90-120 degrees C under stirring at a speed of 500-1000 rpm, and sending oxygen into the reactor at pressure of 1-3 bar to obtain oxidized product.