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Synthesis and investigation of activity of nano-spinels MeCo2O4 (Me: Mn, Ni, Cu) for total oxidation of toluene

corresponding

NGUyEN THANH BINH2*, CÉDRIC GENNEQUIN1, RENAUD COUSIN1, ELENA A. ZHILINSKAyA1, HAINGOMALALA LUCETTE TIDAHy1, NGUyEN MINH SON2, VU THI THU HA3, LE THANH SON2, NGUyEN THI MINH THU2, PHAM XUAN NUI4, STÉPHANE SIFFERT1
*Corresponding author
1. Unité de Chimie Environnementale et Interactions sur le Vivant, Université du Littoral Côte d’Opale, 145 avenue Maurice Schumann, 59140, Dunkerque, France
2. Petroleum Chemistry Department – University of Science – National University of Vietnam, 19-Le Thanh Tong street, Ha Noi, Vietnam
3. Petroleum Chemistry Key Laboratory – Vietnam Industrial Chemical Institute, 2-Pham Ngu Lao street, Ha Noi, Vietnam
4. Petroleum Chemistry Department – University of Geology – Co Nhue, Tu Liem, Hanoi, Vietnam

Abstract

Series of spinel MeCo2O4 (Me: Mn. Ni, Cu) were synthesized by citrate method. These oxides were characterized by different methods as XRD, BET, SEM and H2-TPR. The XRD results showed the pure phase MnCo2O4 but also the existence of simple oxides NiO, CuO beside principal phases NiCo2O4, CuCo2O4 respectively. The BET surface areas diminished in the following order: NiCo2O4>MnCo2O4>CuCo2O4. The SEM showed the size of particle in reverse order. The catalytic activity was evaluated towards total toluene oxidation reaction.CuCo2O4 showed the best activity between 300-340°C. This result is in accordance with H2-TPR :the more the catalyst is reducible, the more it is active for VOC total oxidation. However, the total conversion was not reached. This phenomenon seems to be due to the very low surface area of this catalyst. In conclusion, among the three catalysts, MnCo2O4 reached the total conversion of toluene at the lowest temperature of 375oC.


INTRODUCTION

Volatile Organic Compounds (VOC) emitted during many industrial processes and transport activities contribute significantly to atmospheric pollution. Their presence in atmosphere causes the increase in photochemical smog and depletion of stratospheric ozone (1). Catalytic total oxidation of these compounds is potential technology due to less consumption of energy and less formation of by-products. A lot of catalysts was developed such as noble metal based catalysts (2, 3) or transition metal oxides (4, 5). Among them, recently, transition metal oxides well attracted the attention of researchers because they show a good activity and a low price. However, in severe operation conditions, these catalysts were not stable. To improve stability, nowadays,