Nitrogen bases and carbon deposits on coal liquefaction catalysts

Conference · Wed Jun 01 04:00:00 EDT 1988 · Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States)

OSTI ID:6597590

Milburn, D R; Adkins, B D; Davis, B H ^[1]

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1. Kentucky Energy Cabinet Lab., P.O. Box 13015, Lexington, KY (US)

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. The authors 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: 6597590
• Report Number(s): CONF-8806136-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States) Journal Volume: 33:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
AEROSOL WASTES
ALABAMA
ALKALI METAL COMPOUNDS
ASHES
CARBON
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COAL LIQUEFACTION
COKE
DATA ANALYSIS
DEPOSITS
ELEMENTS
FEDERAL REGION IV
FLY ASH
FUNCTIONAL MODELS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
LIQUEFACTION
NITROGEN
NONMETALS
NORTH AMERICA
OXYGEN COMPOUNDS
PILOT PLANTS
REACTION KINETICS
RESEARCH PROGRAMS
RESIDUES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SORPTION
THERMOCHEMICAL PROCESSES
USA
WASTES