NEW ATOMIC-SCALE INSIGHTS INTO CLUSTER- SIZE, PROMOTER AND SUPPORT EFFECTS OF MOS2-BASED HYDROTREATING MODEL CATALYSTS

摘要

The production of clean transport fuels by hydrotreating and especially hydrodesulfurization (HDS) has recently attracted increased attention due to the introduction of new environmental legislation on fuel specifications. In order to meet these stringent requirements there is a need to understand and improve HDS catalysts. The active phase of the MoS2-based hydrotreating catalyst is composed of 2-3nm wide MoS2-like nanoclusters, typically promoted by Co or Ni, forming the so-called CoMoS and NiMoS nanostructures [1, 2]. Despite intense research efforts, a number of fundamental questions about the morphology of catalytically active particles, their edge structure, the active sites and the detailed location and coordination of the promoter atoms still remain unanswered.