Hydrogenation of a brown coal pretreated with water-soluble nickel/molybdenum and cobalt/molybdenum catalysts
Loy Yang brown coal treated with cobalt acetate/ammonium molybdate ( Co Mo ) gave lower conversions than the very high values obtained for the same coal treated with nickel acetate/ammonium molybdate ( Ni Mo ) when reacted with hydrogen at 400°C. The difference in conversions obtained between the tw...
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Published in | Fuel (Guildford) Vol. 76; no. 14; pp. 1465 - 1469 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
1997
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Loy Yang brown coal treated with cobalt acetate/ammonium molybdate (
Co
Mo
) gave lower conversions than the very high values obtained for the same coal treated with nickel acetate/ammonium molybdate (
Ni
Mo
) when reacted with hydrogen at 400°C. The difference in conversions obtained between the two catalyst systems decreased with increasing time. Addition of sulphur as carbon disulphide (CS
2) eliminated the difference between the
Co
Mo
and
Ni
Mo
catalyst systems, but neither system was more active than a sulphided Mo catalyst. Addition of a hydrogen donor solvent, tetralin, to a reaction in the absence of sulphur decreased conversion for the
Ni
Mo
catalysed system, but increased that for the
Co
Mo
system. The order of activity in reactions without solvent or added sulphur for the coal treated with the individual metals was Co∼Mo < Ni. In the presence of sulphur the order was Co ⪡ Ni < Mo; the addition of sulphur led to no significant improvement with Co catalysts. |
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ISSN: | 0016-2361 1873-7153 |
DOI: | 10.1016/S0016-2361(97)00135-X |