High-pressure sulfidation of hydrotreating catalysts: Genesis and properties of the active phase

High-pressure sulfidation of hydrotreating catalysts: Genesis and properties of the active phase

Dugulan, A.I.

van Veen, J.A.R. (promotor)
de Schepper, I.M. (promotor)

Applied Sciences

2008-04-29

The global petroleum demand is projected to increase in the next decennia as oil is expected to remain the primary source of energy around the globe contributing to approximately 40% of the total consumption. The production of high-quality fuels from crude oil involves physical separation steps but also catalytic processes to remove contaminants (hydrotreating), shift the boiling point (alkylation and hydrocracking) and increase fuel quality (isomerisation). In hydrotreating sulfur, nitrogen, oxygen and metal atoms are removed from the different petroleum streams and unsaturated hydrocarbons are hydrogenated. The main reasons for refineries to perform hydrotreating are of environmental and economic nature. Besides protection of downstream catalysts from poisoning by sulfur, stringent environmental legislation has been aimed at the reduction of sulfur oxide emissions from fuel combustion. The environmental regulations on transportation fuel quality and the diminishing supplies of lighter types of crude oil necessitate further improvement of hydrotreating processes. An important approach is then to further optimize the catalytic activity of hydrotreating catalysts. In spite of the substantial progress made in the fundamental understanding of the active phase morphology, the metal-support interaction and reaction mechanisms, many details about the nature and stability of the active sites have not yet been elucidated. One specific issue not widely addressed is the influence of the sulfidation pressure on the active phase in hydrotreating catalysts. In industrial practice, catalysts are brought in their active, sulfided form at elevated pressure. The main objective of the present study was to understand the effect of the sulfidation pressure on the active phase structure in CoMo and NiW catalysts

hydrodesulfurization
57co mosssbauer emission spectroscopy
182w mossbauer absorption spectroscopy
high-pressure
sulfide catalysts
co-mo-s

http://resolver.tudelft.nl/uuid:f5e257f0-e813-4a50-8d63-7f3efcf5c99d

IOS Press

978-1-58603-863-2

Institutional Repository

doctoral thesis

(c) 2008 A.I. Dugulan