Scholarlink

<p>The oxidative dehydrogenation of propane (ODP) using CO<sub>2</sub> offers a promising route to propylene production, as CO<sub>2</sub> acts as a milder oxidant than O<sub>2</sub>. This study focuses on the synthesis and characterization of CrO<sub>x</sub>/MCM-41 catalysts prepared by co-precipitation of chromium nitrate and tetraethyl orthosilicate (TEOS) in the presence of the C16TMABr template. The resulting MCM-41-supported catalysts, along with the initial MCM-41 support, were characterized by N<sub>2</sub> physisorption, TG-DTG-DTA, XRD, FT-IR spectroscopy, SEM-EDS, UV-Vis DRS, XPS, TPR-H<sub>2</sub>, and small-angle X-ray scattering. Analysis revealed that Cr in the 1-5Cr<sub>inc</sub>/MCM-41 samples primarily exists as Cr<sup>6+</sup>, while in the 7-9Cr<sub>inc</sub>/MCM-41 samples, both Cr<sup>3+</sup> and Cr<sup>6+</sup> are present, with Cr<sup>3+</sup> being the dominant species. Catalytic testing conducted at an atmospheric pressure in the temperature range of 550–750&#xa0;°C showed that the 5Cr<sub>inc</sub>/MCM-41 and 3Cr<sub>inc</sub>/MCM-41 catalysts achieved the highest propylene selectivity (68% at 575&#xa0;°C with a 19% propane conversion and 69% at 600&#xa0;°C with a 13% propane conversion, respectively). Notably, the incorporated Cr<sub>inc</sub>/MCM-41 catalysts exhibited a 1.5–2.5 times higher productivity compared to supported Cr/MCM-41 catalysts.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Properties of CrOx(inc)/MCM-41 catalysts obtained by chromium incorporation and its catalytic activity in the reaction of propane dehydrogenation in the presence of CO2

  • 期刊论文

  • 发表日期：

    2025年9月2日

查看全文
  • Omvir Singh,
  • Marina A. Tedeeva,
  • Maria S. Igonina,
  • Petr V. Pribytkov,
  • Konstantin B. Kalmykov,
  • Gennadiy I. Kapustin,
  • Vera D. Nissenbaum,
  • Igor V. Mishin,
  • Sergey F. Dunaev,
  • Leonid M. Kustov,
  • Alexander L. Kustov

摘要

The oxidative dehydrogenation of propane (ODP) using CO2 offers a promising route to propylene production, as CO2 acts as a milder oxidant than O2. This study focuses on the synthesis and characterization of CrOx/MCM-41 catalysts prepared by co-precipitation of chromium nitrate and tetraethyl orthosilicate (TEOS) in the presence of the C16TMABr template. The resulting MCM-41-supported catalysts, along with the initial MCM-41 support, were characterized by N2 physisorption, TG-DTG-DTA, XRD, FT-IR spectroscopy, SEM-EDS, UV-Vis DRS, XPS, TPR-H2, and small-angle X-ray scattering. Analysis revealed that Cr in the 1-5Crinc/MCM-41 samples primarily exists as Cr6+, while in the 7-9Crinc/MCM-41 samples, both Cr3+ and Cr6+ are present, with Cr3+ being the dominant species. Catalytic testing conducted at an atmospheric pressure in the temperature range of 550–750 °C showed that the 5Crinc/MCM-41 and 3Crinc/MCM-41 catalysts achieved the highest propylene selectivity (68% at 575 °C with a 19% propane conversion and 69% at 600 °C with a 13% propane conversion, respectively). Notably, the incorporated Crinc/MCM-41 catalysts exhibited a 1.5–2.5 times higher productivity compared to supported Cr/MCM-41 catalysts.