Investigations of supported Au-Pd nanoparticles on synthesized CeO2 with different morphologies and application in solvent-free benzyl alcohol oxidation

Abstract

Shusen 2020. Investigations of supported Au-Pd nanoparticles on synthesized CeO2 with different morphologies and application in solvent-free benzyl alcohol oxidation.

Au-Pd nanoparticles immobilized on TiO2 nanosheet as an active and durable catalyst for solvent-free selective oxidation of benzyl alcohol

“…The corresponding results were summarized in Table S1 in SI, which demonstrated that >96% of Au and Pd were successfully anchored on the catalyst surface. The difference between the nominal and actual metal concentration might be attributed to the measurement deviation and the leaching of the weakly adsorbed AuPd during the catalyst preparation [30].…”

Ceria-Based Materials for Thermocatalytic and Photocatalytic Organic Synthesis

“…In the work of Liu et al, AuPd/CeO 2 with 1.2 wt % metal loading and Au:Pd = 1:5 exhibited extremely high activity with a TOF = 30.1 s –1 at 160 °C due to the optimized noble metal nanoparticle distribution and the ceria support with high Ce 3+ content and abundant oxygen defects . Similar to the CeO 2 -supported Au catalyst, the morphology, structure, and physicochemical properties of CeO 2 would also affect the catalytic activity of Au-Pd NPs/CeO 2 in selective oxidation . Au-Pd supported on CeO 2 nanorods was demonstrated to exhibit higher catalytic activity (TOF > 35 900 h –1 ) than Au-Pd supported on conventional CeO 2 due to the high concentrations of oxygen vacancies and Ce 3+ in CeO 2 nanorods as well as the small size of the Au-Pd nanoparticles …”

“…Up to now, the design and synthesis of supported bimetallic catalysts with positive synergetic effects have attracted substantial attention in the catalytic fields, such as organic transformations, CO oxidation, and VOCs decomposition . To increase the catalytic activity of Au nanoparticles in alcohol oxidation to the corresponding aldehydes, introducing other metal elements (e.g., Pd, Ce–Al) to form alloys with Au provides another strategy . For example, Hutchings et al prepared CeO 2 by an antisolvent precipitation technique using supercritical CO 2 (i.e., scCeO 2 ) as support of 2.5 wt %Au-2.5 wt %Pd catalysts for the solvent-free selective oxidation of alcohols using O 2 as oxidant, and the as-prepared 2.5 wt %Au-2.5 wt %Pd/scCeO 2 catalyst with intimately mixed and uniformly highly dispersed surface Au 0 and Pd 2+ species exhibited higher activity than scCeO 2 -supported catalysts containing monometallic Au and Pd only .…”

Influence of Synthesis Time on the Morphology and Properties of CeO2 Nanoparticles: An Experimental–Theoretical Study

“…Shape-selective synthesis of inorganic nanomaterials is of scientific and technological importance because of their unique shape-dependent material properties. − The morphological effect on the overall functionality of CeO 2 explains the importance of their shape-controlled synthetic strategy. Experimental and theoretical studies have confirmed that some CeO 2 nanocrystal properties are surface-structure-dependent .…”