Synthesis, characterization and catalytic performance of bimetallic Ir-Pt catalysts for tetralin hydrogenation.
Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional
Abstract
Bimetallic Pt–Pd catalysts have received considerable attention, because they show high
activity in a variety of catalytic applications (1) and stability compared with monometallic Pt or
Pd catalysts. For instance, the bimetallic Pt–Pd catalysts have been shown to have higher
resistance toward poisonscompared to Pt catalysts (2-4). For supported bimetallic clusters, the
surface and bulk composition strongly depend on a series of parameters, for example,
preparation procedures, metal–metal and metal–support interactions. The final goal is to find the
optimal proportion of each metal in order to be more active in these processes.In this case a
series of Ir and Pt modified SBA-15 were prepared by the consecutive wet impregnation
method, with different content of each metal. The final catalysts were characterized by XRD,
TEM and H2 chemisorption to study the effect of content of metal on the dispersion of
iridium/platinum. The catalysts synthesized with similar percentage of both metal showed the
best activity measured in tetralin hydrogenation.
Platinum (Pt) and Iridium (Ir) nanoparticles were incorporated into SBA-15 support [1-4] by the
wet co-impregnation method. The metal precursors were Iridium acetylacetonate and
cloroplatinic acid. The samples were calcined at 500°C and previous to the catalytic test the
samples were reduced by heating at 2°C/min to 450°C in a H2 stream for 5 h. Hereinafter this
catalyst will be referred as Ir-Pt- SBA-15 (x), with x= 1-3.
The catalytic activity was measured in a 4563Parr reactor, at 250°C, 15 atm of pressure of
hydrogen and 360 rpm for tetralin hydrogenation (feed consisted in 50 mL of 5% v/v of tetralin
(98.5% FLUKA) in Dodecane).
The Pt-Ir-SBA-15 catalyst with 1 %wt. of each metals had the highest activity measured in
tetralin hydrogenation at mild conditions. The good activity was correlated with higher Ir/Pt
dispersion on SBA-15 mesostructured material used as support, as we seen by TEM and H2
Chemisorption, with higher active metal sites exposed to reactant. The Ir-Pt-SBA-15 activity is
sufficiently high to envisage use in the final stages of a refinery process producing diesel fuel of
high Cetane Number by hydrodearomatization.
Description
Keywords
Iridium-platinum containing SBA-15, Hydrogenation, TEM
Citation
XXIII International Materials Research Congress.
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