Copper,　iron,　and　mixed　copper/iron　exchanged　zeolites　containing　ZSM-5　and　chabazite-like　zeolites　(SSZ-13,　SAPO-18　and　SAPO-34)　were　studied　for　selective　catalytic　reduction　(SCR)　of　NO　with　NH3　with　or　without　propene.　Cu/ZSM-5,　Cu/SSZ-13,　Cu/SAPO-18　and　Cu/SAPO-34　exhibited　high　NO　conversions　without　propene.　However,　as　compared　to　Cu/ZSM-5,　NO　conversions　over　Cu/SSZ-13,　Cu/SAPO-18　and　Cu/SAPO-34　were　more　stable　with　propene,　due　to　coke　formation　over　Cu/ZSM-5.　The　results　of　N-2-adsorption/desorption　and　XPS　showed　that　the　surface　area,　Cu+/Cu2+　ratio　and　the　surface　amount　of　Cu　content　of　Cu/ZSM-5　catalysts　changed　from　324　m(2)/g,　0.03　and　11.5　wt%　for　the　fresh　Cu/ZSM-5　catalyst　to　68　m(2)/g,　0.34　and　5.3　wt%　for　the　used　sample.　However,　there　were　little　changes　between　fresh　and　used　Cu/SSZ-13,　Cu/SAPO-18　and　Cu/SAPO-34　catalysts.　Moreover,　Cu/ZSM-5　catalyst　showed　a　larger　decline　in　NO　conversion　with　time　on　stream　and　a　higher　adsorption　amount　of　propene　compared　to　Cu/SSZ-13,　Cu/SAPO-18　and　Cu/SAPO-34　catalysts.　The　resistance　to　hydrocarbon　poisoning　depended　on　the　pore　geometry　of　the　zeolites.　During　NH3-SCR,　the　presence　of　medium-pore　sizes　in　Cu/ZSM-5　led　to　hydrocarbon　deposition,　which　blocked　the　active　sites　and　also　decreased　the　active　intermediates　needed　for　NO　conversion.　Cu/SSZ-13,　Cu/SAPO-18　and　Cu/SAPO-34　catalysts,　on　the　other　hand,　with　small　pores　and　cage　diameters　and　with　one-dimensional　channel　structures,　showed　higher　hydrocarbon　poison　resistance.　Moreover,　these　copper　exchanged　small-pore　zeolites　showed　much　higher　hydrothermal　stability　than　the　medium-pore　Cu/ZSM-5.　(C)　2012　Elsevier　B.V.　All　rights　reserved.