Gasification of Glucose in Supercritical Water

TLDR

The study proposes a simplified model for the reaction pathways leading to hydrogen production during glucose gasification in supercritical water. The authors conducted glucose gasification in supercritical water (480–750 °C, 28 MPa, 10–50 s residence time) and modeled glucose conversion and COD degradation using pseudo‑first‑order kinetics. Hydrogen yield rises sharply above 660 °C, CO yield falls with temperature likely via water–gas shift, and carbon gasification efficiency reaches 100 % at 700 °C.

Abstract

Gasification of 0.6 M glucose in supercritical water was investigated at a temperature range from 480 to 750 °C and 28 MPa with a reactor residence time of 10−50 s. The yield of hydrogen among gaseous products increased very sharply with increasing temperature above 660 °C. On the other hand, the yield of carbon monoxide decreased with temperature, most probably due to the role of a water−gas shift reaction. Carbon gasification efficiency reached 100% at 700 °C. A simplified model was proposed for the reaction pathways related to hydrogen production. The rates for glucose conversion and COD degradation were obtained by assuming pseudo-first-order kinetics.