TRANSITION METAL NANO-CATALYST, ITS PREPARATION METHOD AND ITS USE IN FISCHER-TROPSCH SYNTHETIC REACTION

摘要

The present invention discloses a transition metal nano-catalyst, a method forpreparing the same, and a process for Fischer-Tropsch synthesis using thecatalyst.The transition metal nano-catalyst comprises transition metal nanoparticlesandpolymer stabilizers, and the transition metal nanoparticles are dispersed inliquidmedia to form stable colloids. The transition metal nano-catalyst can bepreparedby mixing and dispersing transition metal salts and polymer stabilizers inliquidmedia, and then reducing the transition metal salts with hydrogen at 100-200°C.The nano-catalyst can be used for F-T synthesis reaction. The process for F-Tsynthesis using the nano-catalyst comprises contacting a reactant gas mixturecomprising carbon monoxide and hydrogen with the catalyst and reacting. Thecatalyst can rotate freely in three-dimensional space under reactionconditions, andhave excellent catalytic acitivity at a low temperature of 100-200°C.Thosereaction conditions are much milder than those for current industrialcatalysts forF-T synthesis (200-350°C). In addition, the transition metalnanoparticles havesmaller diameter and narrower diameter distribution, which is beneficial tocontrolproduct distribution. Meanwhile, the catalyst can be easily separated fromhydrocarbon products and reused. All of the above merits imply the broadapplication prospects of the transition metal nano-catalyst.