Abstract
Supercritical water is widely used as a superior reactant or solvent in the gasification of biomass and coal. Research shows that hydrogen bonding could reduce the potential energy of chemical reaction between water molecules and organic molecules. However, it is still uncertain whether hydrogen bonds exist in supercritical water at the temperature of coal gasification process (above 873 K). In this paper, a high temperature and pressure visualization platform (Tmax = 1013 K) was built. The hydrogen bonding degree of water from liquid to supercritical is obtained in a wider temperature range. It is a remarkable fact that hydrogen bonds still exist in supercritical water even at temperatures as high as 1013 K. These hydrogen bonds mainly exist in the form of dimer and trimer, which is a significant factor that can’t be ignored in the study of gasification mechanism of coal and organic matter in supercritical water.
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