Abstract
A series of Cu–Pd alloy nanoparticles supported on Al2O3 were prepared and tested as catalysts for deNOx reactions. XRD, HAADF-STEM, XAFS, and FT-IR analyses revealed that a single-atom alloy structure was formed when the Cu/Pd ratio was 5, where Pd atoms were well isolated by Cu atoms. Compared with Pd/Al2O3, Cu5Pd/Al2O3 exhibited outstanding catalytic activity and N2 selectivity in the reduction of NO by CO: for the first time, the complete conversion of NO to N2 was achieved even at 175 °C, with long-term stability for at least 30 h. High catalytic performance was also obtained in the presence of O2 and C3H6 (model exhaust gas), where a 90% decrease in Pd use was achieved with minimum evolution of N2O. Kinetic and DFT studies demonstrated that N–O bond breaking of the (NO)2 dimer was the rate-determining step and was kinetically promoted by the isolated Pd.
Highlights
The reactions of nitric oxide (NO) have garnered intense interest from researchers in the human health,[1] and bioinorganic,[2] industrial,[3] and environmental chemistry elds.[4]
X-ray diffraction (XRD), HAADF-STEM, XAFS, and Fourier-transformed infrared (FT-IR) analyses revealed that a single-atom alloy structure was formed when the Cu/Pd ratio was 5, where Pd atoms were well isolated by Cu atoms
X-ray diffraction (XRD) patterns of the prepared catalysts revealed that Cu–Pd solid-solution alloy phases with bimetallic compositions similar to the metal ratio in the feed were formed (Fig. S1† and Table 1)
Summary
The reactions of nitric oxide (NO) have garnered intense interest from researchers in the human health,[1] and bioinorganic,[2] industrial,[3] and environmental chemistry elds.[4]. A series of Cu–Pd alloy nanoparticles supported on Al2O3 were prepared and tested as catalysts for deNOx reactions.
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