The Reactants’ Phase State: A Nonnegligible Factor in Tetralin Hydrogenation Catalysts Evaluation

Abstract

The effects of reactants' phase states (gas-liquid and single gas phase) on tetralin hydrogenation were investigated in the fixed bed. The kinetics of tetralin hydrogenation under different phase states was analyzed. Results showed that, without phase transition, the tetralin conversion increased with the rise of temperature. However, it decreased dramatically around the dew point of the feed at which the reactants' phase state transferred from gas-liquid phase into gas phase. It was also observed that the gas-liquid phase state was favorable to reduce the deactivation of catalyst in the tetralin hydrogenation.

New Approach to Synthesis of Tetralin via Naphthalene Hydrogenation in Supercritical Conditions Using Polymer-Stabilized Pt Nanoparticles

“…Preliminarily to NL hydrogenation, the catalyst was reduced in hydrogen flow for 3 h at 300 °C and the size of Pt NPs stabilized within HAP was characterized by Scanning Transmission Electron Hydrogenation of NL is well studied in gas-phase and liquid-phase processes [5,6,9,[12][13][14]. A few studies have reported data on the hydrogenation of aromatics in SC CO 2 [15,16] but, to date, there are no reports on TL catalytic synthesis in SC solvent (i.e., hexane) conditions.…”

“…It is noteworthy that the reaction of TL hydrogenation to DLs usually prevails over TL degradation reactions [5,10,11]. Hydrogenation of NL is well studied in gas-phase and liquid-phase processes [5,6,9,[12][13][14].A few studies have reported data on the hydrogenation of aromatics in SC CO2 [15,16]but, to date, there are no reports on TL catalytic synthesis in SC solvent (i.e., hexane) conditions. The best catalytic systems of NL hydrogenation are based on nanoparticles (NPs) of platinum, palladium, nickel and their combinations with other metals supported on coal, alumina, zinc oxide, and zeolites [6,[9][10][11]14,[16][17][18][19][20][21] allowing integral selectivity with respect to TL in the range of 94-99% at high NL conversions, or transforming TL to DLs under more stringent conditions.…”