Preparation of PdCu Alloy Nanocatalysts for Nitrate Hydrogenation and Carbon Monoxide Oxidation

Abstract

Alloying Pd with Cu is important for catalytic reactions such as denitrification reaction and CO oxidation reaction, but understanding of the catalyst preparation and its correlation with the catalyst's activity and selectivity remains elusive. Herein, we report the results of investigations of the preparation of PdCu alloy nanocatalysts using different methods and the catalytic properties of the catalysts in catalytic denitrification reaction and CO oxidation reaction. PdCu alloy nanocatalysts were prepared by conventional dry impregnation method and ligand-capping based wet chemical synthesis method, and subsequent thermochemical activation as well. The alloying characteristics depend on the bimetallic composition. PdCu/Al 2 O 3 with a Pd/Cu ratio of 50:50 was shown to exhibit an optimized hydrogenation activity for the catalytic denitrification reaction. The catalytic activity of the PdCu catalysts was shown to be highly dependent on the support, as evidenced by the observation of an enhanced catalytic activity for CO oxidation reaction using TiO 2 and CeO 2 supports with high oxygen storage capacity. Implications of the results to the refinement of the preparation of the alloy nanocatalysts are also discussed.

Nanostructured Pd−Cu Catalysts Supported on Zr−Al and Zr−Ti for Synthesis of Vinyl Acetate

“…The EDS spectra for PCZT and PCZA samples displayed in Figure (b,d) and Figure b, respectively, are shown in Figure , and suggest the co‐existence of particles with different Cu/Pd atomic ratios. Spectra (a) and (b) in Figure show, respectively, Pd and Cu species, suggesting Cu 2 Pd, Cu 3 Pd and CuPd compounds, confirming the XRD results and in accordance with the literature ,. Spectrum (c) indicates preferentially Pd particles.…”

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

“…Achieving monodispersed bimetallic particles of uniform shape and composition still remains a challenge. [4] Physical methods of deposition of nanostructured catalysts on the base of laser ablation allow to overcome these difficulties and synthesise bimetallic catalysts in one stage under environmentally friendly and reproducible conditions. [5][6][7][8] Among ablation techniques the laser electrodispersion (LED) stands out for its ability to produce monodispersed metal drops in the laser plasma torch.…”

Magnesium oxide supported bimetallic Pd/Cu nanoparticles as an efficient catalyst for Sonogashira reaction

“…SEM images of MgO@PdCu in different magnifications.EDS mapping images of the material MgO@PdCu was also studied(Figure 1, ESI).It can be seen that both Pd and Cu are mostly distributed evenly throughout each PdCu species, suggesting an alloy structure[111][112][113]. Furthermore, energy-dispersive X-ray spectroscopy (EDS) analysis of MgO@PdCu confirmed the presence of Pd, Cu, Mg and N species(Figure 2, ESI).In order to investigate the oxidation states of Pd and Cu in the solid support, X-ray photoelectron spectroscopy (XPS) of the MgO@PdCu was performed (Figure 5).…”