Enhanced Fuel Decomposition in the Presence of Colloidal Functionalized Graphene Sheet-Supported Platinum Nanoparticles
2020
Experiments and simulations
were used to demonstrate that decorating
functionalized graphene sheets (FGSs) with platinum nanoparticles
(Pt@FGS) stabilized these particles. Addition of these particles to
liquid hydrocarbon fuels was observed to significantly affect decomposition
under supercritical conditions at a pressure of 4.75 MPa and temperatures
from 753 to 803 K. The suspension of only 50 ppmw Pt@FGS in the fuel
(equivalent to adding 10 ppmw Pt) enhanced fuel conversion rates (by
up to 24%) with a major effect on specific product yields. The production
of low-molecular-weight species increased in the pyrolysis products
(with the hydrogen yield increasing by a factor of 12.5). ReaxFF molecular
dynamics (MD) simulations supported a mechanism in which synergy between
Pt and FGS catalyzed dehydrogenation during n-C12H26 pyrolysis. The highest conversion rates and
greatest yields of hydrogen and low-molecular-weight species were
observed for fuels containing Pt@FGS particles rather than those containing
either FGSs or Pt-clusters alone. Analysis of the platinum decorated
FGSs post reaction indicated no deterioration of the composite particles.
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