Design of effective catalysts for the aftertreatment of CNG-fueled vehicle exhaust by doping 1% Pt/Ce0.4Zr0.5La0.05Y0.05-xO1.95+x with niobium

•The addition of Niobium can improve the catalytic performance of Pt-based catalyst.•The addition of Niobium enables the presence of Platinum in the catalyst as a metallic state.•The addition of Niobium can improve the thermal stability and anti-sulfur performance of the catalyst.