Synthesis of Catalysts and Its Application for Low-Temperature CO Oxidation

Abstract

A series of Au/-TiO 2 with various Co/Ti ratios prepared. /TiO 2 was prepared by incipient wetness impregnation with aqueous solution of cobalt nitrate. Au catalysts were prepared by deposition-precipitation (DP) method at pH 7 and 338 K. The catalysts were characterized by inductively coupled plasma-mass spectrometry, temperature programming reduction, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The reaction was carried out in a fixed bed reactor with a feed containing 1% CO in air at weight hourly space velocities of 120,000 mL/h g and 180,000 mL/h g. High gold dispersion and narrow particle size distribution were obtained by DP method. The addition of into Au/TiO 2 enhanced the activity of CO oxidation significantly. Au/5% -TiO 2 had the highest catalyst among all the catalysts. was mainly in the form of nanosize Co 3 O 4 which could stabilize the Au nanoparticles. donated partial electrons to Au. The interactions among Au, , and TiO 2 account for the high catalytic activity for CO oxidation.