Carbon　nanotubes　(CNTs)　supported　manganese　oxide　catalysts　were　prepared　through　different　thermal　treatment　routes　and　used　for　low-temperature　selective　catalytic　reduction　of　NO　with　NH3.　The　MnO　x/CNTs　catalyst　prepared　by　calcined　the　precursor　in　air　at　300　C　showed　lower　NO　conversions　than　that　treated　at　250　C,　while　it　showed　higher　NO　conversions　than　the　one　calcined　in　nitrogen.　BET,　TGA,　XRD　and　H　2-TPR　results　indicated　that　CNTs　may　impose　effects　on　the　oxidation　state　and　redox　ability　of　the　manganese　oxide　and　hence　on　the　catalytic　activity　during　the　calcination　process　at　given　temperatures.　©　2014　Elsevier　B.V.