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

于2022年下半年，由于COVID-19旅游限制放宽，研究人员的流动性成为可能。主要研究成果如下：1.将主持教授提供的关于糖转化为平台化学品的纳米金刚石的实验结果与基于氧化石墨烯的催化剂在微波辐射下进行比较，显示后者对反应具有显著的积极影响。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协同作用对氨基酸降解、黄酮苷脱糖和甘油转化为燃料添加剂的影响，显示出独特的协同作用.该研究成果得到了绿色化学和工程领域研究人员的广泛关注，并在国外相关学术会议上以特邀或主题演讲的形式发表。此外，还邀请了欧洲的海外教授为熊本大学的年轻研究人员进行在线（或面对面）讲座。

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.