Highly　durable　photocatalytic　degradation　of　gas　toluene　pollutants　is　a　great　challenge　due　to　the　easy　deactivation　of　photocatalysts.　Herein,　we　synthesized　the　Pt　embedded　at　interface　of　TiO2　nanocomposites　(TiO2/Pt/TiO2)　and　Pt　exposed　on　the　surface　of　TiO2　nanocomposites　(Pt/TiO2/TiO2)　to　investigate　the　effect　of　Pt　position　on　the　photocatalytic　performance　of　toluene　degradation.　It　was　found　that　the　Pt-exposed　samples　showed　inactivation　as　the　reaction　progressed　because　carbonaceous　intermediates　such　as　phenol　and　benzoic　acid　were　observed　to　be　deposited　on　the　exposed　Pt　to　restrain　the　role　of　Pt　in　electron　transfer　for　the　production　of　reactive　oxygen　species.　Whereas,　Pt-embedded　nanocomposites　had　excellent　activity　and　stability　for　toluene　degradation　and　CO2　production　more　than　60　h.　This　was　attributed　to　the　protective　effect　of　the　TiO2　outerlayer.　The　embedded　Pt　was　not　easily　poisoned　by　the　degradation　intermediates,　resulting　in　a　good　electron　transfer　and　the　continuous　production　of　reactive　oxygen　species　for　photocatalytic　reaction.　Therefore,　this　work　provides　an　efficient　approach　for　designing　of　the　stability　of　metal-decorated　photocatalyst　for　the　highly　durable　photocatalytic　performance.　©　2024　Elsevier　Ltd