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<p>A series of CeO<sub><i>x</i></sub>–CrO<sub><i>x</i></sub> catalysts were synthesized via the sol-gel method for the oxidation of toluene. A comprehensive set of characterization techniques, including XRD, N<sub>2</sub> adsorption, Raman spectroscopy, HRTEM, H<sub>2</sub>-TPR, O<sub>2</sub>-TPD, XPS, and in situ DRIFTS, was employed to investigate the structure-performance relationships of the catalysts. Among the catalysts, the one with a Ce/Cr molar ratio of 1:3 exhibited the best performance in toluene oxidation, with the activation energy for toluene degradation decreasing from 54.5&#xa0;kJ mol<sup>−1</sup> for CeO<sub><i>x</i></sub> to 31.3&#xa0;kJ mol<sup>−1</sup> for the CeO<sub><i>x</i></sub>–CrO<sub><i>x</i></sub> (1:3) and CO<sub>2</sub> selectivity reaching 100% at temperatures above 250&#xa0;°C. This enhancement was primarily attributed to an increased specific surface area, an elevated concentration of highly active Cr<sup>6+</sup> species, and improved reducibility and mobility of surface oxygen species. During the reaction, toluene was rapidly adsorbed and converted into benzoate intermediates, which were subsequently oxidized to form the final products, CO<sub>2</sub> and H<sub>2</sub>O.</p>

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Relationship between Physicochemical Properties and Toluene Oxidation Performance of the CeOx–CrOx Catalysts

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Dong Ye,
  • Xiaoxiang Wang,
  • Kai Zhu,
  • Ke Wu

摘要

A series of CeOx–CrOx catalysts were synthesized via the sol-gel method for the oxidation of toluene. A comprehensive set of characterization techniques, including XRD, N2 adsorption, Raman spectroscopy, HRTEM, H2-TPR, O2-TPD, XPS, and in situ DRIFTS, was employed to investigate the structure-performance relationships of the catalysts. Among the catalysts, the one with a Ce/Cr molar ratio of 1:3 exhibited the best performance in toluene oxidation, with the activation energy for toluene degradation decreasing from 54.5 kJ mol−1 for CeOx to 31.3 kJ mol−1 for the CeOx–CrOx (1:3) and CO2 selectivity reaching 100% at temperatures above 250 °C. This enhancement was primarily attributed to an increased specific surface area, an elevated concentration of highly active Cr6+ species, and improved reducibility and mobility of surface oxygen species. During the reaction, toluene was rapidly adsorbed and converted into benzoate intermediates, which were subsequently oxidized to form the final products, CO2 and H2O.