This paper describes the activity of Pt catalysts supported on metal-oxides (TiO2, ZrO2 and Al2O3) for the reduction reaction of selenate with hydrazine monohydrate in aqueous solution. The Pt/TiO2 catalyst exhibited superior performance in the reduction reaction of selenate with hydrazine monohydrate, compared with the Pt/ZrO2 and Pt/Al2O3 catalysts. The deactivation of Pt/TiO2 catalyst was attributed to the coverage of Pt particles by reduction product Se metal. To overcome this problem, a Pt catalyst supported on carbon nanotubes (CNTs) coated with TiO2 (TiO2/CNT) was also prepared. The selenate conversion over the Pt/TiO2/CNT catalyst was much higher than that over the Pt/TiO2 catalyst of the same Pt loading. Incorporating CNTs significantly improved the catalytic activity and durability of the Pt catalyst for the reduction of selenate. (C) 2016 Elsevier B.V. All rights reserved.