The promotion effect of tungsten on monolith Pt/Ce0.65Zr0.35O2 catalysts for the catalytic oxidation of toluene

A mesoporous Ce 0.65 Zr 0.35 O 2 support was synthesized via co-precipitation, and Pt/Ce 0.65 Zr 0.35 O 2 and Pt-WO 3 /Ce 0.65 Zr 0.35 O 2 catalysts were prepared through the incipient-wetness impregnation method for the catalytic oxidation of toluene. As evidenced by the catalytic activity results,...

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Bibliographic Details
Published in:New journal of chemistry 2019, Vol.43 (15), p.5719-5726
Main Authors: Hou, Zhongyan, Zhou, Xiaoying, Lin, Tao, Chen, Yaoqiang, Lai, Xiaoxiao, Feng, Jie, Sun, Mengmeng
Format: Article
Language:English
Subjects:
Ammonia
Catalysts
Catalytic activity
Catalytic converters
Catalytic oxidation
Cobalt
Fourier transforms
Moisture content
Oxidation
Platinum
Toluene
Tungsten oxides
X ray photoelectron spectroscopy
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Summary:A mesoporous Ce 0.65 Zr 0.35 O 2 support was synthesized via co-precipitation, and Pt/Ce 0.65 Zr 0.35 O 2 and Pt-WO 3 /Ce 0.65 Zr 0.35 O 2 catalysts were prepared through the incipient-wetness impregnation method for the catalytic oxidation of toluene. As evidenced by the catalytic activity results, the temperature for the complete conversion of toluene using the monolith Pt-WO 3 /Ce 0.65 Zr 0.35 O 2 catalyst decreased by about 30 °C compared to that using Pt/Ce 0.65 Zr 0.35 O 2 . In addition, the physicochemical properties of the catalysts were characterized via N 2 adsorption-desorption, XRD, H 2 -TPR, XPS and NH 3 -TPD experiments. The in situ DRIFTs technique was used to study the toluene catalytic oxidation process. The results showed that the excellent catalytic activity of Pt-WO 3 /Ce 0.65 Zr 0.35 O 2 is ascribed to its good low-temperature reducibility, higher surface-adsorbed oxygen concentration, and greater medium strength acidity. The temperature for the complete conversion of toluene on the monolith Pt-WO 3 /Ce 0.65 Zr 0.35 O 2 catalyst decreases by about 30 °C compared to that on Pt/Ce 0.65 Zr 0.35 O 2 .
ISSN:1144-0546
1369-9261
DOI:10.1039/c8nj06245e