The effect of cross-linking on the thermal decomposition of diphenylalkanes
In the early stages of the thermal depolymerization of coal, its cross-linked macromolecular structure may restrict the diffusion of reactive intermediates and alter the reaction pathways. In an effort to model the effects of restricted mass transport on the thermally induced free radical decomposition of polymethylene units bridging aromatic clusters in coal, a series of diphenylalkanes (Ph(CH{sub 2}){sub n}Ph) have been cross-linked to an inert silica surface by the condensation of the corresponding phenol, HOC{sub 6}H{sub 4}(CH{sub 2}){sub n}C{sub 6}H{sub 4}OH. Results from the thermolysis of the diattached substrates at 350--400 {degrees}C will be presented and compared to the thermolysis of fluid phase and mono-attached diphenylalkanes ({approx}Ph(CH{sub 2}){sub n}Ph) to highlight the impact that restricted diffusion has on the reaction mechanisms.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5714130
- Report Number(s):
- CONF-920444-11-Extd.Abst.; ON: DE92007836
- Resource Relation:
- Conference: American Chemical Society national meeting, San Francisco, CA (United States), 5-10 Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
01 COAL, LIGNITE, AND PEAT
ALKYLATED AROMATICS
PYROLYSIS
COAL
STRUCTURAL MODELS
PHENOLS
CHEMICAL REACTIONS
SILICA
CROSS-LINKING
HYDROGEN TRANSFER
RADICALS
REACTION INTERMEDIATES
AROMATICS
CARBONACEOUS MATERIALS
CHALCOGENIDES
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
SILICON COMPOUNDS
SILICON OXIDES
THERMOCHEMICAL PROCESSES
400201* - Chemical & Physicochemical Properties
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry
010409 - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)