Preparation of PdAuCu/C as a Highly Active Catalyst for the Reduction of 4‐Nitrophenol by Controlling the Deposition of Noble Metals

Abstract

The reasonable control of the dispersion of noble metals is an important topic for heterogeneous catalysts. In this manuscript, PdCu/C, AuCu/C and PdAuCu/C were prepared by the galvanic reduction method to ensure that Pd and Au follow the distribution of Cu nanoparticles. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectrometer elemental mappings and lines scans. Both the Pd and Au had very high dispersion no matter whether they were introduced individually or simultaneously. The Pd and Au were distributed mainly on the Cu nanoparticles as evidenced by the energydispersive spectrometer elemental mappings and lines scans. The reduction of 4-nitrophenol was used as a model reaction for the prepared catalysts. PdCu/C and AuCu/C showed high activity for this reaction compared to the literature, and the activity could be further increased by the introduction of Pd and Au in an appropriate ratio at the same time. The normalized reaction rate reached 2.005 s À 1 mM À 1 for the PdAuCu/C-2.0, in which the mole ratio of Pd to Au was 2.0.

Catalytic Hydrogenation of 5‐Hydroxymethylfurfural to Hexanetriol

“…The high‐resolution of Ru 3P showed two B.E. peaks centered at 483.2 and 461.5 eV [21,62–64] . This should be ascribed to the metallic Ru 3P 1/2 and 3P 3/2 peaks.…”

A defect-enriched PdMo bimetallene for ethanol oxidation reaction and 4-nitrophenol reduction

“…10,11 However, the currently used catalysts for the above reactions exhibited limited conversion efficiency. In light of this, it is crucial to develop cost-effective, stable and highly efficient catalysts to enable broader applications of the EOR and 4-NP reduction.Interestingly, Pd-based catalysts, such as PdCu, 12,13 PdNi, 14,15 and PdW, 16,17 etc. have emerged as excellent candidates for the EOR and 4-NP reduction.…”

“…Interestingly, Pd-based catalysts, such as PdCu, 12,13 PdNi, 14,15 and PdW, 16,17 etc. have emerged as excellent candidates for the EOR and 4-NP reduction.…”