Thermolysis of surface-immobilized phenethyl phenyl ether

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:6297594

Britt, P F; Buchanan, III, A C; Hitsman, V M

Our research has focused on modeling the constraints on free-radical reactions that might be imposed in coal as a consequence of its cross-linked macromolecular structure by covalently bonding diphenylalkanes to an inert silica surface. A surface-immobilized phenethyl phenyl ether ({approx}PhCH{sub 2}CH{sub 2}POh, or {approx}PPE-3) has been prepared as a model for ether linkages in lignin by the condensation of p-HOPhCH{sub 2}CH{sub 2}OPh with the surface hydroxyls of a high purity fumed silica. Thermolysis of {approx}PPE-3 at saturation surface coverage at 375{degree}C produces {approx}PhCH = CH{sub 2} and PhOH as the major products which are consistent with the proposed free-radical chain mechanism for the decomposition of fluid-phase phenethyl phenyl ether. However, significant quantities of {approx}PhCH{sub 3} and PhCHO (ca. 18% of the products) are produced indicating the emergence of a new reaction pathway on the surface. The mechanism for the decomposition of {approx}PPE-3 will be discussed in light of this new information. 18 refs., 1 fig.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6297594
• Report Number(s): CONF-910402-6; ON: DE91007846
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALDEHYDES
ARYL RADICALS
BENZALDEHYDE
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL COATING
COAL
DEPOSITION
ENERGY SOURCES
ETHERS
FOSSIL FUELS
FUELS
MATERIALS
MATHEMATICAL MODELS
MINERALS
MOLECULAR MODELS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHENETHYL RADICALS
PHENOXY RADICALS
PYROLYSIS PRODUCTS
RADICALS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACE COATING