Sulfide Catalysts for Hydrodesulfurisation:Structure of the Active Component and Mechanism of the catalytic action

摘要

A new phenomenon in heterogeneous catalysis,namely,oxidative addition of hydrogen to active metal atoms(Ni,Co)within sulfide catalysts for hydrodesulfurisation,is considered.The possibility of hydrogen occulusion into the MoS_2 matrix of the active component of the catalysts is demonstrated.The electronic structure of Ni(IV)and Co(III)active centres with d~6 electron configuration is analysed.A concerted mechanism of thiophene hydrogenolysis on a bimetallic active site is considered and substantiated.The concept of the governing role of the metal-sulfur bond energy in catalysis by metal sulfides is critically analysed.