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- W1505153889 abstract "Over the past few years, a study for a private company has been ongoing at Auburn in parallel with its coal liquefaction program, that involves the development of a hydrogenation process using feedstocks that can be derived from coal. For economic reasons this hydrogenation process had to be done at low severity conditions, i.e., at low temperatures (/sup /minus//100/degree/) and at low hydrogen partial pressures (/sup /minus//100 to 200 psi.). It was found that the hydrogenation could be done in the required low pressure and temperature ranges only after a variety of design and operational changes had been made to increase hydrogen gas/liquid mass transfer rates. In reducing process severity, mass transfer related parameters and kinetic activity related parameters (e.g., catalyst activity/selectivity) must be changed simultaneously. In the following discussion, first it is shown that both a reduction in hydrogen partial pressure and an increase in temperature for the hydrogenation of a heavy coal-derived fraction (SRC) lead to catalyst deactivation. This reaction data for model compound hydrogenation at high severity conditions and at low severity conditions are presented. In so doing, the responses in catalyst activity/deactivation to changes in kinetic and mass transfer parameters are examined. A comparison is thenmore » made between the observed responses and governing mechanisms at high severity conditions, and some conclusions are drawn regarding the importance of mass-transfer parameters - particularly gas/liquid mass transfer - in maintenance of catalyst activity at low severity conditions.« less" @default.
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- W1505153889 date "1988-01-01" @default.
- W1505153889 modified "2023-09-27" @default.
- W1505153889 title "Deactivation of a hydrogenation catalyst: importance of mass transfer" @default.
- W1505153889 hasPublicationYear "1988" @default.
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