BIOMASS TRANSFORMATION WITH SOLID ACID AND BASE CATALYSTS IN NEAR-CRITICAL AND SUPERCRITICAL WATER

摘要

In this study, we examined the effects of some metal oxide catalysts for biomass (glucose, glycerol, and vegetable oil) conversion in near- and supercritical water, using batch reactors. For glucose reactions, reaction temperatures ranged from 473 to 723 K. Above 573 K, glucose was converted more than 10% conversion within a heat-up time. However, gasification via retro-aldol condensation mainly proceeded above 623 K regardless with and without catalyst. At lower temperature (473 K), dehydrogenation of glucose occurred and some metal oxides (TiO_2) enhanced the dehydrogenation. For glycerol and vegetable oil conversion, ZrO_2 was possibly act as a base catalyst.