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

2022年下半年，由于新冠肺炎疫情的旅行限制放宽，研究人员的流动性得以实现。主要完成了以下研究活动和成果：将主持人教授提供的纳米金刚石催化剂与基于氧化石墨烯的催化剂在微波辐射下的糖转化为平台化学品的实验结果进行了比较，结果表明后者对反应有显著的积极影响。但是，催化剂的稳定性，特别是在高反应温度下的稳定性还有待验证。详细分析了CO2-H2O对氨基酸降解、黄酮类糖苷中糖部分的去除和甘油转化为燃料添加剂的协同作用，显示出独特的协同作用。碳基催化剂表面的这种CO2-H2O协同效应的整合也被证实对反应有很好的影响。研究成果受到国内外绿色化学与工程领域研究人员的广泛欢迎和关注，并应邀在国外相关学术会议上发表或作主题演讲。还邀请了海外的欧洲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.