锰催化剂腐殖酸推机理.pdf
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Fuel Processing Technology, 10 (1985) 239--247 239
Elsevier Science Publishers B.V., Amsterdam --Printed in The Netherlands
ON A POSSIBLE ROLE FOR ELECTROCHEMICAL OXIDATION IN
COAL LIQUEFACTION
A. POMFRET, C. GIBSON, K.D. BARTLE, N. TAYLOR and D.G. MILLS
Department of Physical Chemistry, University of Leeds, Leeds LS2 9JT (Great Britain)
(Received August 21st, 1984; accepted October 30th, 1984)
ABSTRACT
The feasibility of coal conversion via electrochemical liquefaction has been investi-
gated. Because of the complicating presence of inorganic materials in coals, humic acids
extracted from lignites have been used as model substrates. Considerable reductions in
molecular mass, as revealed by size exclusion chromatography, were achieved by anodic
oxidation at 1.7 V for slurries in acid, and more especially for solutions in alkali. NMR
spectroscopy of methylated humic acids before and after oxidation suggests cleavage of
ether linkages between aromatic clusters, with generation of carboxyl groups.
INTRODUCTION
The liquefaction of coal involves the breaking down of the macromole-
cular structure [1] of aromatic units linked by molecular bridges of alkyl
groups and heteroatomic structures; at the same time the ratio of hydrogen
to carbon is increased, and the content of sulphur, nitrogen and mineral
Elsevier Science Publishers B.V., Amsterdam --Printed in The Netherlands
ON A POSSIBLE ROLE FOR ELECTROCHEMICAL OXIDATION IN
COAL LIQUEFACTION
A. POMFRET, C. GIBSON, K.D. BARTLE, N. TAYLOR and D.G. MILLS
Department of Physical Chemistry, University of Leeds, Leeds LS2 9JT (Great Britain)
(Received August 21st, 1984; accepted October 30th, 1984)
ABSTRACT
The feasibility of coal conversion via electrochemical liquefaction has been investi-
gated. Because of the complicating presence of inorganic materials in coals, humic acids
extracted from lignites have been used as model substrates. Considerable reductions in
molecular mass, as revealed by size exclusion chromatography, were achieved by anodic
oxidation at 1.7 V for slurries in acid, and more especially for solutions in alkali. NMR
spectroscopy of methylated humic acids before and after oxidation suggests cleavage of
ether linkages between aromatic clusters, with generation of carboxyl groups.
INTRODUCTION
The liquefaction of coal involves the breaking down of the macromole-
cular structure [1] of aromatic units linked by molecular bridges of alkyl
groups and heteroatomic structures; at the same time the ratio of hydrogen
to carbon is increased, and the content of sulphur, nitrogen and mineral
锰催化剂腐殖酸推机理
