Liliana Lazar

STUDY OF THE NON-CATALYTIC AND CATALYTIC OXIDATIVE DESTRUCTION OF VOCs

In recent years, the release of volatile organic compounds (VOCs) has received much attention. Catalytic oxidation of VOCs, found in small concentration in industrial gas emissions constitutes an alternative for environmental pollution reduction. In this paper, a comparative study regarding the non-catalytic and catalytic oxidative destruction of non-halogenated or halogenated C6 hydrocarbons (C6H14, C6H12, C6H6, Cl-C6H5, Br-C6H5), is presented. Catalytic oxidation was studied in the presence of industrial V2O5-WO3/TiO2 (0.53 %wt. V2O5) catalyst, specific for SCR-DeNOx processes in high-dust system. Oxidative destruction was carried-out at 150 – 350 C in dry and, respective, humid air stream (5 %vol. H2O), for low concentration of hydrocarbons in gas phase (< 100 ppm). The catalytic oxidation of hydrocarbons is partial, apart of CO2, also CO being detected at the end of the reaction. Study of noncatalytic oxidation of hydrocarbons showed that independent of the presence of water vapors, aromatic hydrocarbons do not react in gas phase. The acyclic hydrocarbons react in gas phase starting with the temperature of 300 C.