Alkali　metals　were　considered　to　be　poisonous　to　not　only　V-based　catalysts　but　also　Mn-based　catalysts.　Catalysts　of　Mn-Ce-M/TiO2　(M　=　Fe,　Ni)　prepared　by　co-precipitation　method　for　low　temperature　selective　catalytic　reduction　(SCR)　of　NO　with　NH3　under　the　influence　of　alkali　metals　were　investigated　in　this　study.　As　the　experiment　result,　the　low　temperature　SCR　activity　showed　greatly　enhanced　which　near　at　150　degrees　C　the　substitution　of　the　Fe　content　to　Mn-Ce/TiO2　catalyst　could　obviously　increased　to　87%　without　alkali　metals　and　the　best　NO　conversion　of　Mn-Ce-Ni/TiO2　catalyst　under　alkali　metals　in　the　temperature　range　of　150-300　degrees　C　was　88%　(K/Mn　=　0.5).　The　addition　of　alkali　metal　not　only　generates　physical　adsorption　but　also　reduces　the　surface　chemisorbed　oxygen　and　causes　a　decline　in　Bronsted　acid　sites.　These　catalysts　showed　higher　SCR　activity　and　better　resistance　to　alkali　poisoning,　because　the　characteristics　of　the　large　surface　area　and　pore　volume,　the　increased　chemisorbed　oxygen,　the　enhanced　oxidative　ability　of　manganese　species　and　the　presence　of　many　weak　acid　sites.　(C)　2014　Published　by　Elsevier　B.V.