Synergistic Effect of ZSM-5 Zeolite in Pt–CeO₂–TiO₂/ZSM-5 Catalysts for Highly Efficient Catalytic Oxidation of VOCs

Abstract

A series of Pt−CeTi/ZSM-5 catalysts (0.5 wt % Pt) with different CeO 2 −TiO 2 /ZSM-5 mass ratios were synthesized and used for the catalytic oxidation of 1,2-dichloroethane and benzene. The results reveal that the strong Pt/CeO 2 −TiO 2 interaction can be evidently enhanced by introducing proper amounts of CeO 2 −TiO 2 mixed oxides, resulting in the improvement of Pt dispersion and redox properties as well as the production of more defective oxygen and Pt 2+ species. The synergistic effect between abundant ZSM-5 acid sites (especially strong acid sites) and strong Pt/CeO 2 −TiO 2 oxidizing sites facilitates the deep oxidation of benzene, intermediates, and byproducts generated from the 1,2-dichloroethane oxidation process at lower temperature. Among the catalysts, Pt−CeTi/ZSM-5(1/10) with the CeO 2 −TiO 2 /ZSM-5 mass ratio of 1/10 exhibits the greatest activity for benzene and 1,2-dichloroethane oxidation, showing the T 90% of 145 and 245 °C, respectively. Moreover, the catalyst also possesses satisfactory adaptability for the oxidation of various VOCs and durability for 1,2-dichloroethane oxidation.

Stable Loading of TiO2 Catalysts on the Surface of Metal Substrate for Enhanced Photocatalytic Toluene Oxidation

“…The fixing of TiO 2 powder on the suitable support to form a monolithic catalyst is important for the large-scaled VOCs photodegradation in the practical equipment. The support materials for the loading of TiO 2 in the current reports are always the micro-nanomaterials, such as activated carbon fiber [11], molecular sieve [12] and SiO 2 [13]. Although these support materials effectively improve the VOCs degradation efficiency of TiO 2 , the final products are still the powder catalysts and unsuitable for the practical application [14,15].…”