Gold Nanoparticles Supported on Urchin-Like CuO: Synthesis, Characterization, and Their Catalytic Performance for CO Oxidation

Abstract

Gold catalysts have been studied in-depth due to their unique activities for catalytic CO oxidation. Supports have intrinsic motivation for the high activity of gold catalysts. Thermally stable urchin-like CuO microspheres, which are potential support for gold catalysts, were prepared by facile solution-method. Then gold nanoparticles were loaded on them by deposition-precipitation method. The obtained gold catalysts were characterized by SEM, XRD, TEM, BET, ICP, and XPS. Their catalytic activity for CO oxidation was also evaluated. TEM results revealed that the gold nanoparticles with small sizes were highly distributed on the CuO surface in Au1.0/CuO-300. XPS observations demonstrated that the gold species in Au1.0/CuO-300 was of metallic state. Among the as-prepared catalysts, the Au1.0/CuO-300 catalyst displayed the best performance for CO oxidation and achieved 100% CO oxidation at 80 °C. It kept 100% conversion for 20 h at a reaction temperature of 180 °C, and showed good reusability after three reaction-cycles. The possible catalytic mechanism of Au1.0/CuO-300 catalyst for CO oxidation was also briefly proposed.

Noble Metal Nanoparticles Incorporated Siliceous TUD-1 Mesoporous Nano-Catalyst for Low-Temperature Oxidation of Carbon Monoxide

“…As observed, amongst several noble metals, Au nanoparticles were very active in the CO oxidation [ 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]. Several of evidenced noble metals were explored to support the claim, with reference to Au nanoparticles, that some of them were inert and did not participate in one way or another in the chemical reaction, e.g., silica [ 54 , 55 ], while some participated in the reaction such as Al 2 O 3 in [ 51 ].…”

Distinct reconstruction of aluminum-doped oxide-derived copper enhances the selectivity of C2+ products in CO2 electroreduction

“…S8†). 50 Notably, the Cu 2p peaks of CuO_Al shifted slightly to a higher binding energy from those of CuO, indicating that Cu of CuO_Al has a slightly higher oxidation state than that of CuO. X-ray absorption fine structure (XAFS) spectra at the Cu K-edge were obtained to determine the electronic structures of the catalysts.…”

Exchanging Anion in CuCo─Carbonate Double Hydroxide for Faradaic Supercapacitors: A Case Study

“…51 Under a hydrothermal environment at elevated temperatures and pressures, the surface energy of the nanospikes is much higher, deriving the aggregation of individual spikes to bundles to reduce the Gibbs free energy of the whole system. 52 Pertinently, owing to the different electronic environments of Cu 2+ and Co 2+ present in hydroxide crystal nuclei, which prefer different growth orientations. 53 Henceforth, the nanospike bundles share a common core, yet radically grow outward, resulting in a sea urchin morphology.…”