Preparation of MoS₂ Catalyst for Ultra-deep Desulfurization of Diesel Oil by a Media Agitation Mill

Effect of Circumstance Pressure in Grinding Mill

Abstract

Effect of circumstance pressure in mill on comminution of molybdenum sulfide (MoS₂) used for hydro-desulfurization (HDS) catalyst was investigated. MoS₂ was prepared in argon at a pressure between 0.7kPa and 0.2MPa using a media agitation mill with an addition of butanol. Comminuted MoS₂ was characterized in crystal structure, specific surface area, pore size distribution and catalytic activity for HDS of dibenzothiophene (DBT). Maximal of specific surface area of MoS₂ was obtained by comminution at a pressure of 30kPa. On the other hand, the destruction of layered structure of MoS₂ and the volume of micro-pore having a width of 0.4-0.6nm increased with Ar pressure. MoS₂ prepared at a high Ar pressure had a high catalytic activity for HDS of DBT. These results suggested that the catalytic activity was influenced by the destruction of layered structure and the generation of micro-pores by mechano-chemical activation.