Influence of support on the performance of molybdenum sulfide catalysts used to hydrotreat coal liquids

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5727343

McCormick, R L

Supports for molybdenum sulfide hydrotreating catalysts included silica, silica-magnesia, titania, chromia-alumina, activated carbon and nitrided activated carbon. The alumina supported Amocat 1A and Amocat 1C as well as the silica-alumina supported, Harshaw CoMo-0402 were also studied. Catalysts were characterized by BET surface area, mercury porosimetry and x-ray powder diffraction. Acidity was measured by the temperature programmed desorption of tert-butyl amine. Initial activity screening studies were conducted in a stirred autoclave batch reactor to determine appropriate metals loadings for the various supports. Initially active catalysts were then tested in a bench scale, trickle bed reactor to determine activity maintenance, coking tendency and selectivity at lined out conditions. Selectivities for hydrodenitrogenation and for the production of hydrogen donor molecules were of interest. The donatable hydrogen content of the produce was determined by {sup 1}H and {sup 13}C NMR spectroscopy. The results indicated a strong correlation between lined out hydrogenation activity and the volume in 60-200 {angstrom} diameter pores. A second correlation was observed between HDN activity and acid site density, indicating the importance of acid sites in denitrogenation. Low acidity catalysts appeared to produce a greater hydrogen donor content in the product oil than did high acidity catalysts but the results were not conclusive. The results also suggest that Bronsted acid sites can markedly reduce coking tendency but that in general, coke formation is related in a complex way to the acid/base chemistry of the surface.

• Research Organization: Wyoming Univ., Laramie, WY (USA)
• OSTI ID: 5727343
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ACTIVATED CARBON
ADSORBENTS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMINES
BENCH-SCALE EXPERIMENTS
CARBON
CARBON 13
CARBON ISOTOPES
CARBONIZATION
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COAL LIQUIDS
COHERENT SCATTERING
COKING
CONTROL
CORRELATIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DENITRIFICATION
DEPOSITION
DESORPTION
DIFFRACTION
DISPERSIONS
ELEMENTS
EVEN-ODD NUCLEI
FLUIDS
HYDROGEN 1
HYDROGEN ISOTOPES
HYDROGEN TRANSFER
HYDROGENATION
ISOTOPES
LIGHT NUCLEI
LIQUIDS
LOADING RATE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MICROSTRUCTURE
MIXTURES
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PH VALUE
POROSIMETERS
POROSITY
REFRACTORY METAL COMPOUNDS
RESONANCE
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
SULFIDES
SULFUR COMPOUNDS
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE CONTROL
TESTING
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION