Hydrogen-transfer-promoted bond scission initiated by coal fragments
The authors report evidence to support a new mechanism for coal liquefaction in which strong linkages (i.e., nonthermolyzable linkages such as diarylmethanes, other alkylaromatics, and diaryl ethers) are cleaved at 400 C as a result of hydrogen transfer from solvent-derived cyclohexadienyl radicals in a direct bimolecular step (radical hydrogen transfer, RHT). Evidence has recently been presented for the operation of this pathway in model compounds. Addition of coal samples to these model compounds markedly accelerated the cleavage of the strong central bonds. Further, this cleavage exhibits the high selectivity typical of the RHT process, suggesting that radical hydrogen transfer, if anything, is more relevant to actual liquefaction than indicated by previous pure model compound studies. The relative liquefaction efficiencies of various donor solvents is shown to be much more readily rationalized by this mechanism than by the traditional bond-scission/radical-capping liquefaction mechanism. 26 references, 2 figures, 2 tables.
- Research Organization:
- SRI International, Menlo Park, CA
- DOE Contract Number:
- FG22-84PC70810
- OSTI ID:
- 6831723
- Journal Information:
- Energy Fuel; (United States), Journal Name: Energy Fuel; (United States) Vol. 1:2; ISSN ENFUE
- Country of Publication:
- United States
- Language:
- English
Similar Records
Factors controlling hydrogenolysis in coal liquefaction: Quarterly report No. 4 for the period April 1, 1987 to June 30, 1987. [1,2'-dinaphthylmethane]
Factors controlling hydrogenolysis in coal liquefaction: Quarterly report No. 3 for the period January 1, 1987 to March 31, 1987. [1,2'dinaphthylmethane]
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CHROMATOGRAPHY
CLEAVAGE
COAL
COAL LIQUEFACTION
CRYSTAL STRUCTURE
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
HYDROGEN TRANSFER
KINETICS
LIQUEFACTION
MASS SPECTROSCOPY
MATERIALS
MICROSTRUCTURE
PROMOTERS
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES