Characterization and catalytic activity of WNiMo/Al{sub 2}O{sub 3} catalyst for hydrodenitrogenation of pyridine

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie970386v· OSTI ID:603764

Park, Y C; Oh, E S; Rhee, H K ^[1]

---

1. Seoul National Univ. (Korea, Republic of). Dept. of Chemical Engineering

Various transition-metal catalysts supported on {gamma}-alumina were prepared and applied for the hydrodenitrogenation (HDN) of pyridine. The NiMo/Al{sub 2}O{sub 3} catalyst showed higher activity than the Mo/Al{sub 2}O{sub 3} catalyst. On the basis of the results of reaction experiments and measurements of IR and TPR, the enhancement in the HDN activity with nickel addition could be attributed more to the improvement in the reducibility of molybdenum than to the effect of Broensted acid site. Tungsten impregnated on the NiMo/Al{sub 2}O{sub 3} catalyst as a secondary promoter enhanced the catalytic activity. From the results of various characterization analyses, the positive evidences supporting the HDN activity promotion were obtained. These are the formation of more Broensted acid sites (FT-IR), the enhanced reducibility of Mo (TPR), the increase of octahedrally coordinated Mo{sup 6+} species (DRS), and the creation of more anion vacancy sites (ESR and NO adsorption). Apparently, all of these features are combined to give the promotional effect of tungsten in the NiMo/Al{sub 2}O{sub 3} catalyst for the HDN activity.

• OSTI ID: 603764
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 12 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
04 OIL SHALES AND TAR SANDS
CATALYSTS
CATALYTIC EFFECTS
COAL LIQUIDS
DENITRIFICATION
MOLYBDENUM
NICKEL
PETROLEUM FRACTIONS
PROMOTERS
PYRIDINE
SHALE OIL FRACTIONS
TUNGSTEN