Analyses of the Synergy of Sub/Supercritical H2O-CO2 System for Synthesis of Green Platform Chemicals

在2022年下半年，由于新冠肺炎旅行限制的放松，研究人员的流动成为可能。主要研究工作和成果如下：1.将主持教授提供的纳米金刚石在微波辐射下的糖转化为平台化合物的实验结果与氧化石墨烯催化剂进行了比较，结果表明氧化石墨烯催化剂对反应有显著的促进作用。然而，催化剂的稳定性，特别是在高反应温度下的稳定性需要验证。详细分析了CO2-H2O在降解氨基酸、脱除黄酮苷中的糖基、甘油转化为燃料添加剂等方面的协同作用，显示了独特的协同效应。这种CO2-H2O协同作用在碳基催化剂表面的整合也被证实具有良好的反应效果。该研究成果受到绿色化学和工程领域研究人员的欢迎和兴趣，并作为邀请或主旨讲座在海外相关学术会议上介绍。海外欧洲东道主教授也被邀请为熊本大学的年轻研究人员在线(或面对面)授课。

In the latter half of AY2022, researchers' mobility was possible due to the easing of COVID-19 travel restrictions. The following research activities and outcomes were achieved:1. The experimental results on nanodiamond provided by host professor on sugar conversion to platform chemicals were compared with graphene oxide-based catalysts under microwave irradiation, showing the latter to have significantly positive effect on reaction. However, stability of the catalysts especially under high reaction temperatures needs to be verified.2. Detailed analysis of the CO2-H2O synergy on the degradation of amino acids, removal of sugar moieties from flavonoid glycosides and glycerol conversion to fuel additives were performed, showing unique synergistic effect on reactions.3. The integration of this CO2-H2O synergy on carbon-based catalyst surface was also verified to have promising effect on reactions.The research outcomes gained popularity and interests among researchers working in the fields of green chemistry and engineering, and were presented in related academic conferences overseas either as invited or keynote lectures. Overseas European host professors were also invited to give online (or in-person) lectures to young researchers in Kumamoto University.