Nitrogen bases and carbon deposits on coal liquefaction catalysts
- Kentucky Energy Cabinet Laboratory, Lexington (USA)
The respective roles of coke and alkali as poisons of coal liquefaction catalyst activity have attracted the interest of numerous researchers in the past decade. It is believed that coke formation occurs on catalyst acid sites and that the basicity of coke precursors is an important factor in determining the propensity for coke formation. It is also well-known that alkali metals, especially sodium, can poison acid sites. The coal liquefaction catalyst environment often contains basic compounds (nitrogen bases) and alkali metals (in the coal ash). Recently, the authors have correlated elemental analysis data obtained for catalyst samples from the Wilsonville, Alabama coal liquefaction pilot plant. They were surprised to find that a simple mechanistic model involving (a) nitrogen bases chemisorbed on acid sites, and (b) poisoning of acid sites by sodium, can explain virtually all of the interesting coke-formation trends seen in the Wilsonville process since the inception of the two-stage liquefaction (TSL) process mode. The purpose of this paper is to describe this model.
- OSTI ID:
- 5435692
- Report Number(s):
- CONF-8806136--
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA), Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA) Vol. 33:2; ISSN 0569-3772; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nitrogen base poisoning of NiMo liquefaction catalysts: a kinetic study
Narrowing the field in coal liquefaction
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALABAMA
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COAL
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COKE
DEPOSITION
ELEMENTS
ENERGY SOURCES
FEDERAL REGION IV
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INDUSTRIAL PLANTS
LIQUEFACTION
MATERIALS
MATHEMATICAL MODELS
METALS
MOLYBDENUM
NICKEL
NITROGEN COMPOUNDS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PILOT PLANTS
POISONING
SEPARATION PROCESSES
SODIUM
SORPTION
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
TSL PROCESS
USA