fulltext.study @t Gmail

The role of Co–Mo–S type structures in hydrotreating catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43910 45995 2007 6 PDF Available
Title
The role of Co–Mo–S type structures in hydrotreating catalysts
Abstract

The Co–Mo–S model is used widely to understand and control the catalytic properties of hydrotreating catalysts. Depending on the nature of the support interactions, the Co–Mo–S structures may be present as either Type I or II which has different catalytic properties. Most current high activity industrial hydrotreating catalysts are based on Type II structures. From a fundamental point of view, it has for many years been difficult to understand in detail the catalytic properties of the different types of Co–Mo–S structures since direct atom-resolved insight has not been available. Recently, such insight has been provided by scanning tunneling microscopy (STM) and from the application of density functional theory (DFT) and together with other advances, this has contributed greatly to improve our fundamental knowledge of MoS2 and Co–Mo–S structures. Many surprising features were discovered. For example, it has been observed that key catalytic steps may involve active sites which are not sulfur vacancies. Of particular interest, it was found that fully sulfur-coordinated sites with metallic-like properties play a role in hydrogenation reactions of such catalysts. The new insight has played a role in the recent introduction of the BRIM™ family of improved industrial hydrotreating catalysts.

Keywords
Hydrodesulfurization; STM; DFT; HADF-STEM; Support interaction; Hydrogenation; Active sites; MoS2; MoS2; Brim sites
First Page Preview
The role of Co–Mo–S type structures in hydrotreating catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 322, 16 April 2007, Pages 3–8
Authors
,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis