Inhibition by nitrogen compounds in the simultaneous hydrogenation of polyaromatic compounds over Pt-Pd-F/AI203 catalyst.
Date
2015
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
The inhibiting effect of basic and non-basic nitrogen compounds on the hydrogenation
of polyaromatic compounds and on the hydrodesulphurization (HDS) of
dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6DMDBT), has been
investigated on Pt-Pd-F/Al2O3 and compared with a commercial NiMo hydrotreating
catalyst. Langmuir-Hinshelwood type rate equations were used to describe the reaction
kinetics accurately with physically meaningful and well identified parameter values.
Model parameters were tuned by fitting experimental data obtained in a continuous flow
reactor at 345°C, 1000 psi pressure and different contact times. Pt-Pd-F/Al2O3 was
more active than NiMo catalyst and conversion remained constant during 24 h of TOS.
The model was able to correctly interpret all the experimental data. Parameter
estimation results showed that phenanthrene and naphthalene inhibited the tetralin
hydrogenation rate, whereas naphthalene and tetralin had no appreciable effect on the
rate of phenanthrene conversion. This inhibition could be explained by the competitive
adsorption and was described in the kinetic model by adsorption terms obtained from
the multicomponent experiments. The inhibiting effect of different nitrogen compounds
on the polyaromatic hydrogenation was determined. The following nitrogen compounds
were investigated in this study: quinoline, 1,2,3,4-tetrahydroquinoline, indole, and
indoline. The degree of inhibition was expressed in terms of an apparent adsorption
constant derived from the kinetics.The inhibiting effect on the HDS of DBT and 4,6 DBT
followed the same trend.
Description
Keywords
Platinum-palladium, Fluor, Hydrogenation, HDT
Citation
XXIV International Materials Research Congress, 2015.
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