PERFORMANCES OF THE CoMn/AC OXIDE CATALYST FOR ETHYLBENZENE CATALYTIC COMBUSTION IN AIR

The supported CoMn/AC composite oxide catalyst was prepared by impregnation methods and characterized by XRD, XPS, and H2-TPR analyses. The catalytic activities were investigated by ethylbenzene catalytic combustion on fresh and used CoMn/AC catalyst. The thermally stable performance of the CoMn/AC catalyst precursor material was analyzed by TG-DSC. TG-DSC results showed that the activated carbon support had a high thermal stability lower than 450 [degrees]C in the static air atmosphere. The prepared CoMn/AC oxide catalyst exhibited high ethyl-benzene catalytic combustion activity, and the ethyl-benzene catalytic combustion conversion on the CoMn/AC oxide catalyst exceeded 87.9% at 240 [degrees]C. The ethyl-benzene catalytic combustion conversion can exceed 97.3% at 250 [degrees]C, although the used CoMn/AC catalyst showed slight deactivation. The supported CoMn/AC catalyst showed excellent reused performance for ethyl-benzene catalytic combustion. Based on the XPS and H2-TPR results, the decrease of the ethyl-benzene catalytic activity of the used CoMn/AC catalyst can be attributed to the consumption of the surface reactive oxygen species. Therefore, it can be reasonably concluded that high reacts oxygen species content can be responsible for the good ethyl-benzene catalytic combustion activity of the tested CoMn/AC oxide catalyst, and the supported CoMn/AC catalyst is a promising candidate for ethyl-benzene catalytic removement.