Catalytic hydrotreating of solvent refined coal (SRC-II): the effect of metal combinations, impregnation technique and water addition on catalyst activity
Solvent refined coal (SRC-II) must be catalytically hydrotreated at elevated temperatures and pressures to improve its stability and meet the feedstock requirements of conventional petroleum refineries and boilers. Once the operating conditions are set, the development of catalysts is the primary problem. Four transition metals, cobalt (Co), nickel (Ni), molybdenum (Mo) and tungsten (W), were selected as the catalytic magnets and impregnated on a 8-alumina support having large surface area and pore size. In the first stage, seven different combinations of the metals were impregnated by stepwise impregnation technique to test their hydrotreating activity. In the second stage, the most active metal combinations, Ni-Mo and Co-Mo, were subjected to three different impregnation techniques to test the effect of impregnation method on catalytic activity. The effect of the presence of 2% water in the feed on the catalytic activity was tested for every catalyst. The most active metal combinations among the seven were Ni-Mo for hydrodenitrogenation (HDN) and hydrogenation (HYD), and Co-Mo for hydrocracking (HYC). Water enhanced the activity of the catalysts containing Ni-Mo and Co-Mo combinations, but inhibited activity of the catalysts containing Ni-Mo and Ni-W combinations. In general, HYC activities of the catalysts prepared by stepwise impregnation were improved by water addition.
- OSTI ID:
- 6491922
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL PREPARATION
COBALT
CATALYTIC EFFECTS
MOLYBDENUM
NICKEL
SOLVENT-REFINED COAL
CATALYTIC CRACKING
HYDROCRACKING
TUNGSTEN
COMPARATIVE EVALUATIONS
CORRELATIONS
IMPREGNATION
PERFORMANCE TESTING
SRC-II PROCESS
WATER
CHEMICAL REACTIONS
COAL LIQUEFACTION
CRACKING
DECOMPOSITION
ELEMENTS
FUELS
HYDROGEN COMPOUNDS
LIQUEFACTION
METALS
OXYGEN COMPOUNDS
PYROLYSIS
SYNTHESIS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction