A　titania　pillared　interlayered　clay　(Ti-PILC)　supported　vanadia　catalyst　(V2O5/TiO2-PILC)　was　prepared　by　wet　impregnation　for　the　selective　catalytic　reduction　(SCR)　of　NO　with　ammonia.　Compared　to　the　traditional　V2O5/TiO2　and　V2O5-MoO3/TiO2　catalysts,　the　V2O5/TiO2-PILC　catalyst　exhibited　a　higher　activity　and　better　SO2　and　H2O　resistance　in　the　NH3-SCR　reaction.　Characterization　using　TPD,　in　situ　DRIFT　and　XPS　showed　that　surface　sulfate　and/or　sulfite　species　and　ionic　SO42-　species　were　formed　on　the　catalyst　in　the　presence　of　SO2.　The　ionic　SO42-　species　on　the　catalyst　surface　was　one　reason　for　deactivation　of　the　catalyst　in　SCR.　The　formation　of　the　ionic　SO42-　species　was　correlated　with　the　amount　of　surface　adsorbed　oxygen　species.　Less　adsorbed　oxygen　species　gave　less　ionic　SO42-　species　on　the　catalyst.　(C)　2016,　Dalian　Institute　of　Chemical　Physics,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.　All　rights　reserved.