In this work we report the pioneering gas-phase conversion of glycerol into glycidol in one-step over Cs–ZSM-5 zeolite catalyst with SiO₂/Al₂O₃ = 1500. The structure and catalytic performance of catalysts synthesized by wet impregnation method with different Cs loadings were studied. The catalysts were characterized by ICP–MS, XRD, N₂ physisorption, STEM–EDX, SEM, pyridine-DRIFT, CO₂–TPD, NH₃–TPD, and TGA techniques. The reaction was carried out in a packed-bed continuous flow reactor under atmospheric pressure. The highest achieved glycidol yield was 40.4 mol% over 20wt% Cs–ZSM-5(1500) catalyst with 10 wt% glycerol in the feed at 350 °C reaction temperature and GHSV_total = 1250 h^-1. The glycidol selectivity was increasing steadily from 41.4 to 64.3 mol% during 27 h time-on-stream. This catalyst showed relatively high stability and selectivity, which was attributed to the presence of a suitable amount of basic sites and the strong CsNO₃/HZSM-5 support synergetic interaction. Based on the identified reaction products, we propose the reaction mechanism of the catalytic glycerol conversion to glycidol over the tested catalysts.

在这项工作中，我们报告了在SiO ₂ / Al ₂ O ₃ = 1500的Cs–ZSM-5沸石催化剂上一步一步将甘油气相转化为缩水甘油的过程。湿浸渍法合成的催化剂的结构和催化性能研究了具有不同Cs负载的情况。通过ICP-MS，XRD，N ₂物理吸附，STEM-EDX，SEM，吡啶-DRIFT，CO ₂ -TPD，NH ₃ -TPD和TGA技术对催化剂进行了表征。该反应在填充床连续流反应器中在大气压下进行。在350°C反应温度和GHSV下，进料中20wt％Cs–ZSM-5（1500）催化剂中甘油含量为10 wt％时，最高缩水甘油产率为40.4 mol％_总计＝ 1250h ^-1。在运行27小时后，缩水甘油的选择性从41.4 mol％稳定增加。该催化剂表现出相对较高的稳定性和选择性，这归因于存在适量的碱性位点和强的CsNO ₃ / HZSM-5支持协同作用。基于确定的反应产物，我们提出了在测试的催化剂上催化甘油转化为缩水甘油的反应机理。