Catalytic Combustion Performance Of Chlorobenzene Over Ceria-Titania-based Complex Metal Oxides

Chloride Volatile Organic Compounds(CVOCs)cause persistent and cumulative influence on human health and ecological environment.Catalytic combustion technology has been identified as one of the most reasonable,economical and feasible technology for CVOCs removal.The development of catalysts with high catalytic performance and anti-chlorine poisoning performance is a hot topic in current research.In this paper,two-dimensional ceria-titania-based catalysts 10%Mn/Ce0.3Ti0.7O2 and three-dimensional ceria-titania-based catalysts 3DOM Ce0.3Ti0.7O2 with high catalytic performance and anti-chlorine poisoning performance were designed for the catalytic combustion of chlorobenzene-a model of CVOCs.SEM and others were applied to optimize the preparation of catalysts.10%Mn/Ce0.3Ti0.7O2 as a representative to investigate the catalytic combustion process and mechanism of chlorobenzene on the ceria-titania-based catalysts.A two-dimensional manganese-supported ceria-titania-based catalyst was prepared by sol-gel method.The results show that the catalytic activity is best when the Ce/Ce+Ti ratio is 0.3,the Mn loading is 10%,and the calcination temperature is 550 0C.The 10%Mn/Ce0.3Ti0.7O2 catalyst has an amorphous structure and no obvious agglomeration.It is highly dispersed and has a large specific surface area and a small pore size.It exhibited stable at 90%chlorobenzene removal activity on 14 h long-time stability tests at 330?.Ordered polystyrene(PS)colloidal crystal templates were successfully prepared by centrifugal self-assembly and evaporation self-assembly methods.In the process of filling liquid precursors,it is appropriate to single impregnation with the 0.3 atomic ratio Ce/Ce+Ti.The three-dimensional support has better structural integrity and thermal stability when the calcination temperature is 500?.The macropore-wall of three-dimensional ordered macroporous(3DOM)Ce0.3Ti0.7O2 is composed of mesoporous channels.The rich macroporous structure facilitates the diffusion of reactants and products in the catalyst pores.Doping Ce makes 3DOM Ce0.3Ti0.7O2 form a lattice defect.It exhibited stable at 100%chlorobenzene removal activity on 14 h long-time stability tests at 330?.The mechanism of chlorobenzene on the ceria-titania-based catalysts may be attributed to the Deacon reaction and the Mars van Krevelen(MVK)mechanism.The catalyst forms a metal chloride(oxygen)due to a chemical reaction after use.Neglecting physical factors such as mass transfer and diffusion,the kinetic equation for the catalytic combustion of chlorobenzene on 10%Mn/Ce0.3Ti0.7O2 catalyst can be written as:r(C6H5Cl)=dc(C6H5Cl)/dt=16364exp(-13823/RT)[C6H5Cl]0.76?...