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Reactions of coals of different ranks with COH2 mixtures with and without sodium aluminate

✍ Scribed by Chris K.J. Hulston; Peter J. Redlich; W.Roy Jackson; Frank P. Larkins; Marc Marshall

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
553 KB
Volume
74
Category
Article
ISSN
0016-2361

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✦ Synopsis

Well-characterized coals of different H/C atomic ratio and rank were reacted at 365°C with CO, H 2 and CO-Ha mixtures in water in the presence and absence of sodium aluminate. The optimum Ha/CO ratio for conversion was found to vary with the type of coal. It was < 1 : 1 for low-rank and subbituminous coals, whereas the conversion of bituminous coals either did not vary with H a/CO ratio or reached a maximum at a higher H2/CO ratio (2 : 1). Even for a bituminous coal there was no advantage in reducing the water/coal ratio below 2 : 1 in NaA1Oz-catalysed reactions. The conversions increased with increasing H/C atomic ratio of the coal and decreasing rank, with or without NaA102. Asphaltene yields increased with increasing coal rank and increasing proportion of CO in the H2-CO reacting gases. The mechanistic implications of these results are briefly discussed.

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