Iridium- and Platinum-Free Ring Opening of Indan
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Abstract
A 3- and 2-fold increase in selectivities toward 2-ethyltoluene
and <i>n</i>-propylbenzene, respectively, in indan ring
opening (RO) was achieved by introducing palladium to the ruthenium
catalyst. The product selectivities for the Ru–Pd system with
the 4:1 molar ratio were the same as those for monometallic iridium,
known for its outstanding single cleavage selectivity; the lights
formation was suppressed as compared with the monometallic platinum
catalyst. A further increase in the Pd amount did not result in the
selectivity improvement and brought down the activity to the low level
of Pd. The bimetallic catalysts were synthesized in the presence of
poly-(vinylpyrrolidone). The bimetallic systems revealed sintering
resistance up to 400 °C, as compared with their monoforms. The
indan RO activity was maximized after precalcination at 200 °C.
The suggested nanoparticles’ bimetallicity was consistent with
the results of CO-TPD, CO–DRIFTS, thermal stability tests,
and a chemical probe reaction (olefin hydrogenation, in which only
Pd is active). The Pd–Ru system is envisioned as a viable alternative
to monometallic Ir for RO