In　order　to　deal　with　the　pollution　of　NO　in　cement　kiln　exhaust,　the　study　of　NO　catalytic　decomposition　catalyst　obtained　much　more　attention.　The　effect　of　silica-alumina　ratio　on　NO　decomposition　rate　in　cement　kiln　without　other　reductant　was　studied.　The　NO　decomposition　rate　of　catalysts　with　different　silica-alumina　ratio　was　determined　by　infrared　spectrometer.　And　pore　structures　and　the　microstructure　of　the　catalyst　were　characterized　separately　by　BET　surface　area,　nitrogen　adsorption-desorption　and　XRD.　The　results　show　that　silica-alumina　ratio　of　catalyst　was　preferred　to　be　50　with　the　best　NO　decomposition　rate　when　the　temperature　was　below　300　.　The　catalyst　with　silica-alumina　ratio　of　60　has　the　higher　catalytic　activity　when　the　temperature　was　higher　than　300　,　and　the　decomposition　rate　achieved　70%　at　600　.　XRD　results　shows　the　crystallinity　of　catalysts　increased　as　the　silica-alumina　ratio　increased.　BET　surface　area　and　the　cumulative　pore　volume　of　catalysts　gradually　increased,　and　the　average　pore　diameter　gradually　reduced　with　the　increase　of　silica-alumina　ratio.　©　2020　Trans　Tech　Publications　Ltd,　Switzerland.