By Edward Furimsky
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Extra resources for Carbons and Carbon Supported Catalysts in Hydroprocessing
Over AC, the conversion of the THQ1 to OPA, followed by the HDN of the latter could be the only source of propyl benzene (PBz). Such a reaction did occur over AC (batch system) but not over Al2O3 (ﬂow system). 123,124 For the latter, at 653 K, about 7 mol% of OPA was converted to hydrocarbons. 48,103 No conversion of OPA was observed at 613 and 593 K although the HYD equilibrium is becoming more favorable with decreasing temperature. This would indicate a diminished availability of active hydrogen on carbon with decreasing temperature.
The HDS and HDN reactions also occurred, although to a much reduced extent. It is proposed that the asphaltenes depolymerization involved a radical mechanism. e. as hydrogen donors. Of course, toluene alone would not be expected to be the most eﬃcient solvent. However, under these conditions a partial HYD of toluene, followed by hydrogen transfer to asphaltenes and/or their unstable intermediates, appears to be plausible. 133–135 In one mode, this process employs a carbonaceous additive that functions as a carrier of metals and asphaltenes.
96 On the basis of these results, benzene is expected to be the most resistant to HYD in agreement with the trends observed generally. e. 505 in 5- and 12-, as well as 6- and 11positions). This prediction was indeed experimentally conﬁrmed by increasing yield of the dihydrogenated products in the same order as is shown in Figure 13. This is consistent with the general observation that high molecular PAHs are readily converted to lighter fractions providing that catalyst and/or carbon exhibit adequate HYD and HCR activities.