Non-aqueous preparation of LaPO₄nanoparticles and their application for ethanol dehydration

Abstract

SSCI-VIDE+ECI2D+PAFInternational audienceNanodispersed single phase monoclinic and hexagonal LaPO4 materials have been prepared in polar nonaqueous solvents at room temperature, by means of precursor salts metathesis. The morphology and phase composition strongly depend on the nature of the non-aqueous solvent. Reaction in propylene carbonate produced hexagonal LaPO4 nanorods; formamide gave a monolith gel with a monoclinic phase, whereas reaction in ethylene glycol led to the formation of a stable colloidal suspension of M-LaPO4. The outstandingly high specific surface areas of the materials allow their use as soft acidic catalytic materials for highly selective dehydration of ethanol. Comparison of the catalytic properties reveals the importance of the phase polymorph, with hexagonal LaPO4 demonstrating better catalytic performance than the monoclinic phase

Catalytic Oxidation of Chlorinated Organics over Lanthanide Perovskites: Effects of Phosphoric Acid Etching and Water Vapor on Chlorine Desorption Behavior

“…This result indicated that the acidity in the La 3 Mn 2 O 7 −P was very stable in DCM oxidation. As reported,23,40 the LaPO 4 •0.5H 2 O associated with H 3 PO 4 at the surface forming LaPO 4 • 0.5H 2 O • (H 3 PO 4 )…”

“…This result indicated that the acidity in the La 3 Mn 2 O 7 –P was very stable in DCM oxidation. As reported, , the LaPO 4 ·0.5H 2 O associated with H 3 PO 4 at the surface forming LaPO 4 ·0.5H 2 O • (H 3 PO 4 ) x that was stable up to 1400 °C. This result explains why the acidity of La 3 Mn 2 O 7 –P could be stable up to high-temperatures in DCM oxidation.…”

High‐pressure phase transitions and properties of MTO4 compounds with the monazite‐type structure

“…The synthesis and isolation of metastable polymorphs with the monazite structure, which have been recently performed for PrVO 4 , and the study of monazite‐type nanocrystals. Nanoparticles of MTO 4 oxides with the monazite structure can be prepared by soft‐chemistry methods . However, the investigation of monazite nanoparticles under pressure has been occasional .…”

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

“…nanoparticles [37]. In fact, the influence of the inorganic nanoparticles on the thermal stability of polymer/Al 2 O 3 nanocomposites is very complex; which is related to many factors; such as the synthetic method; type of inorganic nanoparticles; structure of composites; the interaction between two components; and so on [38].…”