Rapid supplement of active oxygen by constructing Pt-Fe alloy structure to improve catalytic stability for furniture paints industry VOCs removal

Abstract

To improve the air quality, volatile organic compounds (VOCs) elimination via a stable catalytic oxidation is important. The enhancement in the catalytic stability of toluene and iso-hexane removal is investigated by constructing the Pt-Fe alloy structure. The Pt-Fe alloy structure not only weakens the toluene adsorption, but also improves the lattice oxygen mobility. The Mars-van Krevelen mechanism is presented over the Pt1Fe1.5/M during toluene oxidation, instead of the initial Langmuir-Hinshelwood mechanism. For Pt1Fe1.5/M, the strong ability of O2 activation and the fast migration of lattice oxygen will provide sufficient surface lattice oxygen to ensure a continuous toluene oxidation. An excellent catalytic stability is detected over the catalysts with the high activity of lattice oxygen, which are accelerated by the weaker adsorption and higher temperature during iso-hexane oxidation. Generally, the crucial role of the replenishment speed of active oxygen species is clarified in a stable process of VOCs oxidation. It is valuable for the up-to-standard emission of VOCs from the furniture paints industry.