Scholarlink

<p>A series of ZnCaAl composite oxide catalysts were synthesized via a rapid and straightforward spray-drying method. The crystalline structure, morphology, specific surface area, and surface basicity of the catalysts were systematically characterized by XRD, SEM, BET, and CO<sub>2</sub>-TPD. Results demonstrate that spray-drying significantly enhanced both textural and catalytic properties. For the catalyst with a Zn/Ca molar ratio of 4.0, the specific surface area increased from 35 m<sup>2</sup>/g to 93 m<sup>2</sup>/g compared to its non-spray-dried counterpart, accompanied by a pronounced increase in propylene carbonate selectivity. The resulting spherical morphology and high surface area jointly promoted active-site exposure, facilitating propylene oxide ring-opening and CO<sub>2</sub> adsorption, thereby driving the cycloaddition reaction forward. Under the optimized conditions (150&#xa0;°C, 2.5&#xa0;MPa, 8&#xa0;h, with 1.5 mL of triethylamine as co-catalyst), the sample with a Zn/Ca molar ratio of 4.0 exhibited the best catalytic performance among the tested catalysts with varying molar ratios, achieving 95.89% conversion of propylene oxide and 81.38% selectivity of propylene carbonate.</p> Graphical Abstract <p></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

ZnCaAl Composite Oxide Catalyzes Cycloaddition of CO2 with Propylene Oxide to Produce Propylene Carbonate

  • 期刊论文

  • 发表日期：

    2026年6月26日

查看全文
  • Shuyi Li,
  • Shuangming Li,
  • Haiyang Yu,
  • Yinong Li,
  • Sansan Yu

摘要

A series of ZnCaAl composite oxide catalysts were synthesized via a rapid and straightforward spray-drying method. The crystalline structure, morphology, specific surface area, and surface basicity of the catalysts were systematically characterized by XRD, SEM, BET, and CO2-TPD. Results demonstrate that spray-drying significantly enhanced both textural and catalytic properties. For the catalyst with a Zn/Ca molar ratio of 4.0, the specific surface area increased from 35 m2/g to 93 m2/g compared to its non-spray-dried counterpart, accompanied by a pronounced increase in propylene carbonate selectivity. The resulting spherical morphology and high surface area jointly promoted active-site exposure, facilitating propylene oxide ring-opening and CO2 adsorption, thereby driving the cycloaddition reaction forward. Under the optimized conditions (150 °C, 2.5 MPa, 8 h, with 1.5 mL of triethylamine as co-catalyst), the sample with a Zn/Ca molar ratio of 4.0 exhibited the best catalytic performance among the tested catalysts with varying molar ratios, achieving 95.89% conversion of propylene oxide and 81.38% selectivity of propylene carbonate.

Graphical Abstract