Oxidation Of Benzene, Toluene And Hexane Over Pt Modified Fly Ash Zeolite X

The synthesis of zeolite from Fly Ash (FA) results in a product of highly added value, compared with the use of FA as additive to cement or other products. Due to the content of iron oxides in the fly ash, zeolites synthesized from ash also contain iron in various forms [1,2]. The presence of iron and traces of other metals in FA transferred into zeolites, contributes to the better catalytic performance of the catalysts, based on these zeolites, in oxidation reactions. Catalytic performance of FA zeolites can be improved further by loading of different novel metal species on the zeolite surface [3]. In the present study, by using of a two-stage process of zeolite synthesis (fusion and hydrothermal treatment) zeolite X has been synthesized from FA. The same amount of iron, which is contented in the FA zeolite, was loaded on the reference sample synthesized from pure chemicals in order to be compared with it. Both samples were modified with platinum and the catalytic activity for benzene, toluene and hexane oxidation of the obtained samples was investigated (Fig. 1). The obtained The catalytic activity tests in benzene, toluene and hexane oxidation reaction were carried out in a continuous flow type of glass reactor at atmospheric pressure with a catalyst bed loading of about 0.5 cm3 (fraction 0.63–0.80 mm), inlet benzene concentration 42 g m−3 in air, space velocity 4000 h−1; inlet toluene concentration 200 ppm in 16% O2, space velocity 100 000 h−1; inlet hexane concentration 350 ppm in 16% O2, space velocity 100 000 h−1. different of in FA zeolite and in iron loaded samples. High difference in catalytic activity of benzene oxidation on FANaX and NaX-4.5Fe is observed, in favour of FANaX. This fact also confirms the different states of iron on both samples. exhibits the highest activity. of with and finding of cheaper alternative of X zeolite as catalytic support.