Nitrogen base poisoning of NiMo liquefaction catalysts: a kinetic study
A mechanistic model has been proposed to explain coking on hydrotreating catalysts from four process configurations of the Wilsonville, AL coal liquefaction pilot plant. This model, which utilizes reversible adsorption of nitrogen bases on acid sites, and irreversible poisoning of these sites by sodium, can explain all of the trends seen in the elemental compositions of the catalysts used in six pilot plant runs spanning four process configurations, two coals and two catalysts. In considering the proposed exchanges, the question of overall rate control must be addressed. A simple kinetic analysis is presented in an attempt to determine whether adsorption or desorption is controlling these exchanges.
- Research Organization:
- Kentucky Energy Cabinet Lab., Lexington (USA)
- DOE Contract Number:
- FC22-85PC80009
- OSTI ID:
- 5976845
- Report Number(s):
- CONF-8809273-
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 33:3; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ADSORPTION
ALABAMA
ALKALI METALS
ASHES
BASES
BIMETALS
CARBONIZATION
CATALYSIS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COKING
CRACKING
DECOMPOSITION
DESORPTION
DIAGRAMS
ELEMENTS
EQUATIONS
FEDERAL REGION IV
FLOWSHEETS
FUNCTIONAL MODELS
HYDROCRACKING
HYDROGENATION
INDUSTRIAL PLANTS
ION EXCHANGE
KINETIC EQUATIONS
KINETICS
LIQUEFACTION
MATHEMATICAL MODELS
METALS
MOLYBDENUM
NICKEL
NORTH AMERICA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PILOT PLANTS
POISONING
PYROLYSIS
REACTION KINETICS
RESIDUES
SEPARATION PROCESSES
SODIUM
SORPTION
TEST FACILITIES
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENTS
USA