Ordered　mesoporous　alumina　(OMA)　has　been　widely　used　as　the　adsorbents　and　catalyst　supports　due　to　their　unique　properties　including　highly　uniform　channels　and　large　specific　surface　area.　However,　the　thermal　stability　is　not　ideal　enough.　In　this　work,　P-doped　γ-Al2O3,　which　still　maintained　ordered　mesoporous　structure　even　when　calcined　at　1000　°C,　was　successfully　synthesized　via　a　sol-gel　procedure　with　acetic　acid　as　interfacial　protector.　The　influence　of　the　addition　of　phosphorus　on　the　physicochemical　properties　of　OMA　and　the　catalytic　behavior　of　its　supported　Pd　catalyst　was　investigated　by　combining　several　characterization　methods　with　catalytic　activity　test.　The　results　showed　that　the　introduction　of　phosphorus　resulted　in　enhanced　thermal　stability,　improved　surface　acid-base　performance　and　increased　reducibility　of　the　Pd-alumina　catalysts,　all　of　which　contributed　to　the　excellent　catalytic　performance　in　conversion　of　hydrocarbon　(HC),　CO,　and　NOx.　The　obtained　P-doped　OMA　is　anticipated　to　be　explored　in　other　high　temperature　reactions　due　to　its　unique　thermal　stability　and　acid-base　performance.　©　2018　Elsevier　B.V.