[1] Z. Jia, M. Ben Amar, O. Brinza, A. Astafiev, V. Nadtochenko, A.B. Evlyukhin, B.N. Chichkov, X. Duten, A. Kanaev, J. Phys. Chem. C 116 (2012) 17239-17247.
Nanoparticulate Au(Ag)-(titanium-oxo-alkoxy) coatings for plasma-catalytic air purification Zixian JIAa,b, Mounir BEN AMARa, Arlette VEGAa, Xavier DUTENa, Andrei KANAEVa,* a
LSPM ; Université Paris-Nord 13, Sorbonne Paris Cité, CNRS, Villetaneuse, France
b
LPP, Ecole Polytechnique, UPMC, Université Paris sud 11, CNRS, Palaiseau, France
Keywords: coatings, titanium-oxo-alkoxy nanoparticles, Au (Ag) nanoparticles, plasma-catalysis, VOC removal. Many studies have been recently conducted to control volatile organic compounds (VOC) emissions by adsorption, thermal and catalytic incineration, condensation, membrane separation, bioreaction and photocatalysis. However, the conventional technologies have some disadvantages especially for treatment of low VOC concentrations. Non-thermal plasma (NTP) is considered as an alternative solution, since it can be operated at atmospheric pressure and room temperature, over a large range of gas flow rates and concentrations. The formation of unwanted by-products, low energy efficiency and mineralization prevent its industrialization. In our previous studies, we have reported a new method of preparation of Ag/TiO2nanoparticulate coatings with stable and highly reproducible morphology [1] and studied the degradation of acetaldehyde using a process coupling NTP and this catalyst [2]. Our later studies were directed to enhance the process efficiency and selectivity and to correlate these factors with the deposited noble metals mass and morphology. In this communication, acetaldehyde decomposition was investigated in a diphasic process coupling NTP and a fluidized nanostructured gold-based bed. We show that the size and distribution gold particles strongly affect the acetaldehyde degradation. Compared to silver catalysts, the same quantity of the input pollutant can be decomposed with Au NPs catalysts in similar experimental conditions. In the same time, utilization of the gold catalyst enhances the process selectivity towards CO2 and diminishes formation of by-products like acetic acid, nitromethane and acetonitrile. We introduce a new term, specific pollutants removal efficiency, which characterize the catalyst activity and permits to understand the catalysts morphology influence on the plasma-catalytic process. [1] Z. Jia, M. Ben Amar, O. Brinza, A. Astafiev, V. Nadtochenko, A.B. Evlyukhin, B.N. Chichkov, X. Duten, A. Kanaev, J. Phys. Chem. C 116 (2012) 17239-17247. [2] Z. Jia, A. Vega-Gonzalez, M.B. Amar, K. Hassouni, S. Tieng, S. Touchard, A. Kanaev, X. Duten, Catalysis Today 208 (2013) 82-89.
