Abstract
In the presence of SCR-DeNOx commercial catalyst with low content in active component (0.53 % wt. V2O5), specific to treatment of gas emissions containing nitrogen oxides, benzene oxidation is possible. Benzene catalytic conversion can be influenced by the presence of the other components of the gas emission. In this paper, the experimental results concerning the influence of halogenated acids (HCl, HBr) and sulphur dioxide on benzene behaviour during oxidation in humid air stream (5 % vol. H2O) and defining of the reaction products are presented. Experimental study was conducted on a laboratory set-up operated in continuous regime, at temperatures of 573 – 623 K and for a gas spatial velocity equal to 6400 h-1. Oxidation of benzene, present in low concentration in the gas (80 – 100 ppm C6H6) is partial, the catalytic selectivity towards carbon dioxide forming being approximately 60 %. The presence of halogenated acids and sulphur dioxide determines a supplementary consumption of benzene, as a result of substitution reaction with participation of benzene ring that leads to formation of some aromatic derivatives.