Abstract
In this study we prepared a WO3-based catalyst to investigate its catalytic activity in the total oxidation of the volatile organic compounds known as benzene, toluene and xylene (BTX). For a range of low temperatures (50-450oC) the only reaction products were CO2 and H2O. The results for the catalyst characterization suggested that the high catalytic activity could be attributed to the effects of a strong metal interaction, which is possibly originated from the small lattice parameter difference between the (111), (020) and (002) lattice planes and the presence of W4+, W5+ and W6+ species on the surface of the catalyst which react with active oxygen species.
Highlights
Volatile organic compounds present in air are derived from various industrial processes and they are harmful to human health and to the environment even at low concentrations.[1,2] It is widely recognized that the emission of BTX compounds is a critical environmental problem and several techniques for the reduction of these compounds have been investigated
We investigated the catalytic behavior of a WO3 catalyst, in relation to the complete catalytic oxidation of benzene, toluene and xylene
In previously published studies we use a catalyst of high surface area, which may have favored catalytic activity, while in this study we used a catalyst with a low surface area, suggesting that the catalytic activity is favored by the oxygen storage capacity on the surface, this being very favorable for catalytic oxidation reactions
Summary
Volatile organic compounds (benzene, toluene and xylenes, BTX) present in air are derived from various industrial processes and they are harmful to human health and to the environment even at low concentrations.[1,2] It is widely recognized that the emission of BTX compounds is a critical environmental problem and several techniques for the reduction of these compounds have been investigated. The creation of oxygen vacancies enhanced the oxygen mobility in the tungsten oxide, as indicated by the characterization results discussed above favoring high catalytic activity. According to the results shown, it was observed that the activity of the WO3 catalyst increases in the order m-xylene < p-xylene < toluene < benzene.
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