Synthesis of CeO₂‐Based Quantum Dots through a Polyol‐Hydrolysis Method for Fuel‐Borne Catalysts

Abstract

The transparent colloidal solutions of monodisperse CeO2‐based quantum dots (QDs) were prepared by heating a triethylene glycol (TEG) solution of Ce(NO3)3⋅6 H2O (and Fe(NO3)3⋅9 H2O) at 180 °C. The CeO2‐based QDs were characterized by X‐ray powder diffraction (XRD), dynamic light scattering (DLS), transmission electron microscopy (TEM), UV/vis absorption spectra and Brunauer–Emmett–Teller (BET) surface area. CeO2‐based QDs with uniform particle size below 5 nm exhibit narrow size distribution, quantum effect, good re‐dispersion ability and high surface area. For the formation of these QDs, a polyol‐hydrolysis mechanism is proposed. CeO2 QDs are applied in fuel borne catalysts (FBCs) for diesel soot combustion, which exhibit excellent activity at a rather low temperature, owing to the homogeneous and large number of contact points between the catalyst and the soot. The doping with Fe can further improve the selectivity to CO2.

Pushing the Performance Limit of Cu/CeO2 Catalyst in CO2 Electroreduction: A Cluster Model Study for Loading Single Atoms

“…The CeO 2 cluster-supported Cu single-atom catalyst is synthesized via a polyol-mediated method (Figure a). The CeO 2 clusters are produced by heating a triethylene glycol (TEG) solution of Ce­(NO 3 ) 3 ·6H 2 O at 180 °C . To achieve Cu loading, Cu­(NO 3 ) 2 ·3H 2 O is added into the cooled suspension of CeO 2 clusters, followed by a second heating step.…”

Synthesis of Cerium Dioxide Nanoparticles by Gas/Liquid Pulsed Discharge Plasma in a Slug Flow Reactor

“…The dehydration reaction tended to occur at high local plasma temperatures. H 2 O as a polar molecule attracted protons from the OH – ions, triggering the crystallization of CeO 2 , according to reaction . where x and y are positive integers. Instantaneous and homogeneous nucleation occurred in the slug flow system by pulsed discharge plasma.…”

Crystal facet and surface defect engineered low dimensional CeO2(0D, 1D, 2D) based photocatalytic materials towards energy generation and pollution abatement

“…4(a). The prepared CeO 2 QDs shows good redispersion ability and high specific surface area [65]. Further, Hassan and his coworker suggested two methodologies for the preparation of different size CeO 2 QDs.…”