Enhanced Performance of Supported Ternary Metal Catalysts for the Oxidation of Toluene in the Presence of Trichloroethylene

Catalysts

Hualian Chen¹  Xiaohui Yu¹  Lin Jing¹  Hongxing Dai¹  Zhiquan Hou¹  Yuxi Liu¹  Tiantian Dong¹  Ruyi Gao¹  Jiguang Deng¹  Kun Liu² 

[1] Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Department of Environmental Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China;Institute of Optical Functional Materials for Biomedical Imaging, School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, China;

关键词: supported ternary metal catalysts;    Pt-based catalysts;    volatile organic compounds;    toluene and TCE combustion;    chlorine-resistant ability;   

DOI  :  10.3390/catal12050541

来源: DOAJ

【 摘 要 】

Chlorinated volatile organic compounds (CVOCs), even in small quantities, can cause Pt-based catalyst poisoning. Improving the low-temperature chlorine resistance of catalysts is of vital importance for industrial application, although it remains challenging. Considering actual industrial production, a TiO₂-supported ternary metal catalyst was prepared in this work to study the catalytic oxidation of multicomponent VOCs (toluene and trichloroethylene (TCE)). Among all of the samples, PtWRu/TiO₂ and PtWCr/TiO₂ exhibited the best catalytic performance for toluene oxidation. In the mixed VOC oxidation, the PtWCr/TiO₂ sample showed the best catalytic activity for toluene combustion (a toluene conversion of 90% was achieved at 258 °C and a space velocity of 40,000 mL g⁻¹ h⁻¹, and the specific reaction rate and turnover frequency at 215 °C were 44.9 × 10⁻⁶ mol g_Pt⁻¹ s⁻¹ and 26.2 × 10⁻⁵ s⁻¹). The PtWRu/TiO₂ sample showed the best catalytic activity for TCE combustion (a TCE conversion of 90% was achieved at 305 °C and a space velocity of 40,000 mL g⁻¹ h⁻¹, and the specific reaction rate and turnover frequency at 270 °C were 9.0 × 10⁻⁶ mol g_Pt⁻¹ s⁻¹ and 7.3 × 10^–5 s⁻¹). We concluded that the ternary metal catalysts could greatly improve chlorine desorption by increasing the active lattice oxygen mobility and surface acidity, thus reducing chlorinated byproducts and other serious environmental pollutants. This work may serve as a reasonable design reference for solving more practical industrial production emissions of multicomponent VOCs.

【 授权许可】

Unknown