The high efficiency of ZnAl2O4/ZSM-5 in the removal of carbon monoxide contaminants during photocatalytic oxidation process

In this research, ZnAl(2)O(4 )nanocomposite was developed using the sol-gel method. Using the inoculation method, it was loaded on a ZSM-5 zeolite with variable molar ratios. The properties of the studied catalysts were determined by XRD, SEM, FT-IR, TEM, and BET methods. The photocatalytic activities of ZnAl2O4 and ZnAl2O4/ ZSM-5 nanocatalysts in the photocatalytic oxidation removal of carbon monoxide (CO) were studied under UV radiation in a discontinuous photocatalytic reactor. A gas chromatograph (GC) was applied for investigating the amount of CO removal in the photoreactor. The results indicated that ZnAl2O4/ZSM-5 nanoparticles (NPs) eliminate more CO in less time than pure ZnAl2O4 NPs under the same conditions. The results of the kinetics of the photocatalytic oxidation process of CO show that the reaction kinetics to CO is of the first order, and the rate constants for different molar ratios of zeolite to zinc aluminate (0%-20%) range from 99 x 10(-4) to 14 x 10(-2), respectively. Therefore, spinel/zeolite compounds can be a suitable option for oxidative removal of CO pollutants using the photocatalytic method due to the easy preparation method, low price, and high efficiency of these catalysts.