Embedding lanthanide fluoride-based nanoparticles in TiO2 metallogel to exploit their upconversion and Lewis acid properties for heterogeneous catalysis - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Embedding lanthanide fluoride-based nanoparticles in TiO2 metallogel to exploit their upconversion and Lewis acid properties for heterogeneous catalysis

S. Mishra
B. Purohit
  • Fonction : Auteur
R. Ben Salem
  • Fonction : Auteur
  • PersonId : 1135553
G. Ledoux,
N. Essayem

Résumé

Lanthanide fluorides-based nanoparticles (NPs) are attractive materials due to their unique physico-chemical, magnetic and optical properties. When co-doped with a suitable sensitizer and activator lanthanide ions, the fluoride-based matrix with low phonon energy upconvert near-infrared light to higher energy photons that can be used in photocatalytic reactions [1]. Due to highly electronegative fluoride ions, lanthanide fluorides are also interesting Lewis acids which have been employed as heterogenous catalysts for different organic reactions [2]. Combining these lanthanide fluorides-based NPs with TiO2, which itself is a very good photocatalyst and acid catalysts, is expected to yield catalysts with enhanced catalytic properties. We present here a new strategy of incorporating pre-formed lanthanide fluorides-based NPs in the TiO2-based metallogel, formed through controlled hydrolysis and condensation reactions and without using any organic gelator, to synthesize new fluorinated heteregenous catalysts [3]. Subsequent soft drying of this NPs-incorporated metallogel provided intimately mixed lanthanide fluoride-TiO2 catalysts with high specific surface areas. This presentation will describe thorough characterization of these novel catalysts in terms of phase, morphology, surface area and acidity/basicity and discuss their applications i) near infrared-active photocatalysts, and ii) acid-base catalysts in model reaction of dihydroxyacetone conversion. [1] G. Ledoux, M. F. Joubert, S. Mishra, Upconversion phenomena in nanofluorides, In Photonic and Electronic Properties of Fluoride Materials: Progress in Fluorine Science, Eds. A. Tressaud, K. Poeppelmeier, Chapter 3, p. 35-63, Elsevier, 2016. [2] X. Wu, E. K. L. Yeow, Phys. Chem. Chem. Phys., 2022, 24, 11455-11470. [3] B. Purohit, E. Jeanneau, Y. Guyot, D. Amans, B. Mahler, M.-F. Joubert, C. Dujardin, G. Ledoux, S. Mishra, ACS Appl. Nano Mater. 2023, 6, 2310–2326.
Fichier non déposé

Dates et versions

hal-04189431 , version 1 (28-08-2023)

Identifiants

  • HAL Id : hal-04189431 , version 1

Citer

S. Mishra, B. Purohit, R. Ben Salem, G. Ledoux,, N. Essayem. Embedding lanthanide fluoride-based nanoparticles in TiO2 metallogel to exploit their upconversion and Lewis acid properties for heterogeneous catalysis. Materials Challenges in Alternative & Renewable Energy 2023 (MCARE 2023), Aug 2023, Bellevue, United States. ⟨hal-04189431⟩
22 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More