关键词: 亚/超临界水, 液化, 有机质, 催化升级

Abstract: Sub/supercritical water has unique physical and chemical properties，such as higher solubility，rapid diffusion and efficiency of C—C cleavage，making its use an effective way of liquefaction of organics to produce fuel. In this work SCW liquefaction of several typical organics，such as cellulose，lignin，algae，coal，and polymer was analyzed and the products from those processes were summarized. Additionally，the mechanisms of SCW liquefaction were clarified and key reactions（hydrolysis，prolapse heteroatom and polycondensation）were presented. For further understanding of fuel product upgrading，deoxygenating and hydrogenating technologies，the mechanisms and features of homogeneous catalyst，such as H3PO4，K2CO3，KOH and heterogeneous catalysts，such as Ni，Mo，Pt were also analyzed and summarized. Finally，the shortcomings，such low quality and presence of hetero elements of the current SCW liquefaction technology and the means for upgrading were presented. The bottlenecks and strategies of scale-up were proposed，providing a basis for future application.

Key words: sub/supercritical water, liquefaction, organics, catalytic upgrading