Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Catalysts

Eric Genty¹  Julien Brunet¹  Christophe Poupin¹  Sandra Casale²  Sylvie Capelle¹  Pascale Massiani²  Stéphane Siffert¹  Renaud Cousin¹ 

[1] Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, EA 4492), Université du Littoral Côte d’Opale (ULCO), 145 avenue Maurice Schumann, 59140 Dunkerque, France; E-Mails:;Laboratoire de Réactivité de Surface (LRS), CNRS UMR 7197, Sorbonne Université, Université Pierre et Marie CURIE (UPMC), 4 place Jussieu, 75005 Paris, France; E-Mails:

关键词: mixed oxide;    LDH;    microwaves;    ultrasound;    toluene;    catalytic oxidation;   

DOI  :  10.3390/catal5020851

来源: mdpi

【 摘 要 】

Co₆Al₂HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H₂-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co²⁺ on the surface, the reducibility of the Co-Al mixed oxide and the T₅₀ in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.