1997 Volume 76 Issue 8 Pages 807-813
In order to specify the effect of the Mo catalyst on the coal liquefaction, we experimented on the coal liquefaction using different types of Mo catalyst: Co-Mo/Al2O3 catalyst in two different shapes of the same composition, i. e., (a) extrusion and (b) powder: oil soluble Mo in two different types, i. e., (c) in the case of dissolving in the solvent and (d) in the case of impregnating in the coal in advance.
When we used the hydrogenated anthracene oil (HAO) as a solvent at 673 K and 723 K, we did not find the effect of the shapes of (a) and (b) and type of (c) and (d). In the case of anthracene oil (AO), the conversion is higher in the case of (b) compared with in the case of (a). The differences is effected by limitation of the diffusion of the reactant in the poreof Co-Mo/Al2O3 catalyst.
We expected the increase of the conversion in the case of (d) by the direct catalysis of hydrogenation of solid coal. However, therewas a little or negative effect on the reaction because of the dissolving anddispersing process of Mo metal to the solvent.
The relationship between H2 consumption and coal conversion to hexane solubles: Xh was clearly divided in groups according to solvent species not concerning with the kinds of the catalyst.We concluded by comparing the results of AO and HAO that hydrogen donor capacity of HAO is 6 mol-H2/kg.