Characterization of hydroprocessing catalysts by resolved temperature-programmed desorption, reduction, and sulfiding

Journal Article · Sat Nov 01 04:00:00 EST 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90018-4· OSTI ID:6794346

Nag, N K ^[1]; Fraenkel, D; Moulijn, J A; Gates, B C

---

1. Univ. of Delaware, Newark

A flow system is described for carrying out temperature-programmed desorption and reaction experiments with resolution of the desorbed products by on-stream gas chromatographic analysis. The apparatus has been used to characterize hydroprocessing catalysts (MoO/sub 3/, ..gamma..-Al/sub 2/O/sub 3/, MoO/sub 3/ ..gamma..-Al/sub 2/O/sub 3/ having various MoO/sub 3/ contents, Co-Mo/..gamma..-Al/sub 2/O/sub 3/, Ni-Mo/..gamma..-Al/sub 2/O/sub 3/, and Ni-W/..gamma..-Al/sub 2/O/sub 3/) by temperature-programmed desorption with He, temperature-programmed sulfiding with H/sub 2/S in H/sub 2/, and temperature-programmed reduction with H/sub 2/. The results show that a decreasing temperature of appearance of H/sub 2/S peaks in the temperature-programmed reduction (TPR) spectra of sulfided Mo/Al/sub 2/O/sub 3/ catalysts corresponds to an increasing Mo content and increasing catalytic activity. TPR data provide a rapid qualitative test for the presence of incompletely sulfided MoO/sub 3/ on the catalyst surfaces. Quantitative TPR data associated with the formation of sulfur anion vacancies on the surface indicate that only a small fraction of the sulfur is removed by reaction with H/sub 2/, this fraction being higher for the promoted catalyst Co-Mo/Al/sub 2/O/sub 3/ (approx. 0.3 molecule/nm/sup 2/) than for the less active, unpromoted catalyst Mo/Al/sub 2/O/sub 3/ (approx. 0.06 molecule/nm/sup 2/).

• OSTI ID: 6794346
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 66:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
02 PETROLEUM
020400 -- Petroleum-- Processing
04 OIL SHALES AND TAR SANDS
040404 -- Oil Shales & Tar Sands-- Purification
090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
DATA
DESULFURIZATION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGENATION
INFORMATION
METALS
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONITORING
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROGRAMMING
REFRACTORY METALS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE MONITORING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN