Most　mobile　pollution　sources　have　narrow　space.　Due　to　its　small　occupation　area,　fast　selective　catalytic　reduction　(SCR)　is　more　suitable　for　controlling　oxynitride　(NO　x　)　in　exhausted　gas　in　mobile　pollution　sources　such　as　vessels.　The　fast　SCR　reaction　can　be　divided　into　two　stages:　nitric　oxide　(NO)　catalytic　oxidation　stage　and　NO　x　removal　stage.　This　paper　focused　on　the　study　of　NO　oxidation　catalysts　consists　of　ruthenium-cerium-zirconium　(Ru-Ce-Zr)　metal-oxides.　It　was　found　that　the　doping　of　ruthenium　(Ru)　which　is　the　precious　metal,　greatly　improved　the　catalytic　activity.　The　NO　oxidation　rate　of　catalyst　doped　with　0.5%　Ru　at　300　°C　was　about　15%　higher　than　that　without　Ru.　However,　with　the　increasing　content　of　ruthenium,　the　sulfur　and　water　resistance　of　catalysts　decreased　and　the　activity　of　the　catalysts　was　only　partially　restored　after　regeneration.　The　results　showed　that　Ru　increased　the　activity　of　the　catalysts　while　Ce　and　Zr　improved　the　resistance　of　SO2　and　H2O.　Our　work　provided　a　solution　to　the　space　problem　of　mobile　pollution　sources　such　as　vessels.　©　Published　under　licence　by　IOP　Publishing　Ltd.