Synergistic Effects of Bimetallic AuPd and La2O3 in the Catalytic Reduction of NO with CO

Bimetallic AuPd nanoparticles supported on TiO2 are known to catalyze the reduction of NO with CO. Here, we investigated effects addition lanthanum oxide a AuPd/TiO2 catalyst particle size 2.1–2.2 nm. The La2O3 enhanced catalytic activity; for example, at 250 °C, there was 40.9% conversion and 49.3% N2-selectivity AuPd/TiO2, 100% AuPd-La (1:1)/TiO2. temperature requiring dropped from 400 °C 200 by simple post-impregnation onto AuPd/TiO2. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined modulation excitation (MES) demonstrated that CO adsorption occurs first Au atoms then, within 80 s, moves Pd atoms. This transformation between two sites facilitated La2O3.