Reaction characteristics of homogeneous and heterogenous reactions for glucose gasification in supercritical water using ruthenium catalyst supported on carbon nanotube

Abstract

In this study, a spherical, Ru-based catalyst with a Carbon nanotube (CNT) support was used in a continuous-flow system, where homogeneous and heterogeneous reactions occurred simultaneously. Therefore, determining the homogeneous and heterogeneous reaction rates is important. Glucose (5 and 10) wt%, a typical model biomass compound, was chosen as the feedstock, and the reaction temperature was set at (500 and 600) ℃. The weight hourly space velocity was changed (40, 80, or 160) h−1 by maintaining the catalyst loading at 0.15 g and altering the flow rate (2, 4, or 8) mL/min. A reaction model where homogeneous and heterogeneous reactions proceed in parallel was developed, and the reaction rates were determined. The homogeneous reaction rate constants were (0.00968 and 0.0194) /s for (500 and 600) ℃, respectively, and the heterogeneous ones for Ru-based catalyst with a CNT support were (0.0137 and 0.0420) m3/(kg s) for (500 and 600) ℃, respectively.