Catalytic combustion has been identified as one of the most efficient and economically feasible routes for removing volatile organic compounds. In this work, supported noble-metal (Pd and Pt) catalysts for catalytic combustion of toluene were prepared by an improved incipient wetness impregnation method. Controlled amounts of oleic acid (OA) were introduced into the aqueous solution of metal salts in this new preparation method, which improved Pd and Pt dispersion remarkably on SiO 2 , as confirmed by XRD and TEM. XPS results showed that introduction of OA in the catalyst preparation resulted in increased proportion of metallic palladium. All of the activities in catalysts with OA were much higher than those of the catalysts without OA in the same catalyst system. Among the catalysts prepared, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst exhibited the best catalytic activity for toluene oxidation, and the T 98 of toluene was only 160 °C under the conditions of toluene concentration at 1000 ppm and SV at 60,000 mL/(g h). Furthermore, the 0.25%Pd-0.25%Pt/SiO 2 –OA catalyst maintained high catalytic activity in the active stability test at 160 °C, and the result of TG indicated that no coke was formed on the spent catalyst.
The investigation into the development of an active transition-metal oxide catalyst with controllable morphology for the degradation of volatile organic compounds (VOCs) is a subject of considerable importance and warrants further exploration. In this study, ZIF-67 was prepared and employed as a sacrificial template, with varying quantities of Cu ions incorporated to synthesize layered copper-cobalt double oxide (CuCo-LDO) featuring a modifiable surface state. A comprehensive characterization of the CuCo-LDO catalysts was conducted, encompassing structural properties, morphology, surface chemical state, and redox properties, utilizing a range of analytical techniques. Subsequent evaluations included testing the catalytic activity for toluene oxidation and assessing stability performance. The results revealed that differing Cu contents played a pivotal role in inducing changes in the morphology and structure of CuCo-LDO, thereby significantly influencing its oxidation activity towards toluene. Notably, the flower-like structure of 3CuCo-LDO (Cu% = 20.14 wt.%) exhibited outstanding toluene oxidation activity attributable to its unique structure and composition. This research contributes novel insights to the design of highs-performance catalysts targeting volatile organic compounds.
危险品化学品经营许可证（带存储）