Pyrolysis of surface-immobilized model compounds: Mechanistic implications for the thermal chemistry of coal

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:7263944

Britt, P F; Poutsma, M L

Our research has been investigating the potential role that the cross-linked network structure of coal may play in perturbing free-radical reactions associated with coal thermolysis. This may be particularly important in the thermal conversion of coal at low temperatures, e.g., 350--400{degree}C, where bonds begin to break but most of the residual framework is retained. In order to assess the potential impact of restricted transport on thermal reaction pathways, we have modeled the phenomenon experimentally by studying organic model compounds that are covalently linked to an inert silica surface. The experimental methodology and significant results from studies of the thermolysis of surface-attached Ph(CH{sub 2}){sub n}Ph (n = 0--4) at 345--400{degree}C will be briefly surveyed. Initial results from studies of two-component surfaces will also be presented that reveal the role of radical migration, via facile hydrogen shuttling, in modifying the effects of diffusional constraints. 13 refs., 5 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7263944
• Report Number(s): CONF-900402-3; ON: DE90005278
• Resource Relation: Conference: 199. national meeting of the American Chemical Society, Boston, MA (USA), 22-27 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
PYROLYSIS
COAL
CHEMICAL REACTIONS
CROSS-LINKING
MOLECULAR STRUCTURE
RADICALS
SURFACES
CARBONACEOUS MATERIALS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
ORGANIC COMPOUNDS
POLYMERIZATION
THERMOCHEMICAL PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition
400201 - Chemical & Physicochemical Properties