In situ XAS of Ni-W hydrocracking catalysts.

Conference · Mon Jan 01 00:00:00 EST 2007

DOI:https://doi.org/10.1063/1.2644625· OSTI ID:970772

Yang, N; Mickelson, G E; Greenlay, N; Kelly, S D; Bare, S R; LLC, UOP

Ni-W based catalysts are very attractive in hydrotreating of heavy oil due to their high hydrogenation activity. In the present research, two catalyst samples, prepared by different methods, that exhibit significant differences in activity were sulfided in situ, and the local structure of the Ni and W were studied using X-ray absorption spectroscopy (XAS). The Ni XANES spectra were analyzed using a linear component fitting, and the EXAFS spectra of the WS{sub 2} platelets in the sulfided catalysts were modeled. The Ni and W are fully sulfided in the higher activity sample, and there are both unsulfided Ni ({approx}25%) and W (<10%) in the lower activity sample.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 970772
• Report Number(s): ANL/XSD/CP-118911; TRN: US201003%%111
• Resource Relation: Conference: 13th International Conference on X-ray Absorption Fine Structure (XAFS 13); Jul. 9, 2006 - Jul. 14, 2006; Stanford, CA
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

02 PETROLEUM
ABSORPTION
ABSORPTION SPECTROSCOPY
CATALYSTS
FINE STRUCTURE
HYDROCRACKING
HYDROGENATION
PETROLEUM
SPECTRA
VISCOSITY