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Abstract <p>The SnO<sub>2</sub> doped 0.2 wt&#xa0;% Pt/TiO<sub>2</sub> catalysts were prepared by wet impregnation method for the catalytic oxidation of toluene. The research focused on the SO<sub>2</sub> resistance and catalytic performance of Pt/SnO<sub>2</sub>–TiO<sub>2</sub>. The results showed that <i>T</i><sub>90</sub> (the temperature corresponding conversion of 90%) was 176°C at 1000 ppm toluene concentration and weight hourly space velocity (WHSV) of 36 000 mL h<sup>–1</sup> g<sup>–1</sup>. Adding 10&#xa0;wt&#xa0;% SnO<sub>2</sub> to the Pt/TiO<sub>2</sub> catalyst reduced the adsorption capacity of the active component Pt for SO<sub>2</sub>, enhancing the catalyst’s resistance to SO<sub>2</sub> poisoning. Pt/SnO<sub>2</sub>–TiO<sub>2</sub> catalysts could recover to the initial activity after 9 h poisoning with 2800 ppm thiophene. The Pt/SnO<sub>2</sub>–TiO<sub>2</sub> also maintained good stability during the 60 h test at 240°C with a toluene conversion larger than 99%. A series of characterization tests including XRD, H<sub>2</sub>-TPR, and TEM revealed that Pt/SnO<sub>2</sub>–TiO<sub>2</sub> possesses a mesoporous structure and a large amount of lattice oxygen, with Pt being uniformly dispersed on the carrier surface.</p>

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High Sulfur-Tolerant Pt/TiO2 for Catalytic Complete Oxidation of Toluene

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Jinbo Wang,
  • Yu Wang,
  • Ruixiang Qin,
  • Jing Li

摘要

Abstract

The SnO2 doped 0.2 wt % Pt/TiO2 catalysts were prepared by wet impregnation method for the catalytic oxidation of toluene. The research focused on the SO2 resistance and catalytic performance of Pt/SnO2–TiO2. The results showed that T90 (the temperature corresponding conversion of 90%) was 176°C at 1000 ppm toluene concentration and weight hourly space velocity (WHSV) of 36 000 mL h–1 g–1. Adding 10 wt % SnO2 to the Pt/TiO2 catalyst reduced the adsorption capacity of the active component Pt for SO2, enhancing the catalyst’s resistance to SO2 poisoning. Pt/SnO2–TiO2 catalysts could recover to the initial activity after 9 h poisoning with 2800 ppm thiophene. The Pt/SnO2–TiO2 also maintained good stability during the 60 h test at 240°C with a toluene conversion larger than 99%. A series of characterization tests including XRD, H2-TPR, and TEM revealed that Pt/SnO2–TiO2 possesses a mesoporous structure and a large amount of lattice oxygen, with Pt being uniformly dispersed on the carrier surface.