A　series　of　RE-3Cu/Zr-PILC　(RE　=　La,　Ce,　Nd,　Eu)　catalysts　were　prepared　via　an　impregnation　method　and　activities　for　NH3-SCR　were　evaluated.　The　physicochemical　properties　of　each　catalyst　were　explored　using　XRD,　BET,　H-2-TPR,　NH3-TPD,　XPS　and　in-situ　DRIFTS　techniques.　The　doping　of　RE　had　enhanced　the　NH3-SCR　efficiency　of　3Cu/Zr-PILC.　Among　them,　the　6Ce-3Cu/Zr-PILC　sample　demonstrated　exceptional　performance,　achieving　NO　conversion　rates　exceeding　90%　within　the　temperature　range　of　250-350　degrees　C.　Moreover,　it　reached　its　peak　NO　conversion　rate　of　96.3%　at　300　degrees　C　while　maintaining　an　impressive　resistance　to　SO2.　According　to　the　results　of　TPR,　TPD　and　XPS　analysis,　the　modification　of　RE　(especially　Ce)　enhanced　the　redox　properties,　the　surface　acidity,　the　atomic　ratio　of　Cu2+/Cu+　and　the　amount　of　surface　chemisorbed　oxygen　in　the　3Cu/Zr-PILC　samples,　all　of　these　are　favorable　for　the　NH3-SCR　reaction.　Furthermore,　in-situ　DRIFTS　analysis　reveals　that　the　NH3-SCR　reaction　of　RE-3Cu/Zr-PILC　samples　at　low　temperatures　is　governed　by　the　Langmuir-Hinshelwood　(L-H)　and　Eley-Rideal　(E-R)　mechanisms,　with　the　L-H　mechanism　being　the　predominant　factor.