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Download fileGuaiacol Hydrogenation in Methanesulfonic Acid Using a Stirred Slurry Electrocatalytic Reactor: Mass Transport and Reaction Kinetics Aspects
journal contribution
posted on 2021-09-23, 18:38 authored by Yanuar
Philip Wijaya, Robertus D. D. Putra, Kevin J. Smith, Chang Soo Kim, Elöd L. GyengeThe
electrocatalytic reduction of guaiacol, a lignin model compound,
is investigated in a stirred slurry electrocatalytic reactor (SSER)
under mild conditions (1 atm, 30–60 °C). Methanesulfonic
acid (MSA) is used as an electrolyte due to its eco-friendly properties
along with comparable ionic conductivity to the mineral acids (e.g.,
sulfuric acid and perchloric acid). Mass transport and kinetic aspects
are investigated combining the experimental results obtained under
either galvanostatic or potentiostatic control with reaction network
kinetic models. The reactant mass transport rate to the catalyst particle
surface, together with the collision rates among catalyst particles
and the current collector, respectively, has a significant effect
on guaiacol conversion and Faradaic efficiency. Therefore, optimum
stirring is necessary to ensure good electric contact in the catalyst
bed slurry to achieve substantial electrocatalytic hydrogenation (ECH)
reaction rates. In the absence of mass transfer limitation, reaction
network kinetic modeling based on the Langmuir–Hinshelwood
mechanism was performed and validated by the experimental data. Rate
constants and activation energies were calculated, and it was found
that phenol hydrogenation was the fastest reaction, while 2-methoxycyclohexanol
demethoxylation was the slowest in the overall guaiacol ECH network.
Furthermore, we show that the SSER can be operated at industrially
relevant cathode superficial current densities (>100 mA cm–2), thereby, opening new and practical possibilities
for the sustainable
valorization of biomass-derived compounds.
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lignin model compoundfriendly properties alongcomparable ionic conductivitycatalyst particle surfacecatalyst bed slurryperchloric acid ).mass transfer limitationexperimental results obtainedmethanesulfonic acid usingreaction kinetics aspectsmethanesulfonic acidmass transportkinetic aspectsexperimental datareaction ratesfastest reactionsustainable valorizationsignificant effectrate constantspractical possibilitiespotentiostatic controlphenol hydrogenationoptimum stirringopening newmineral acidsmild conditionsmethoxycyclohexanol demethoxylationfaradaic efficiencyelectrolyte dueelectrocatalytic reductioneither galvanostaticderived compoundscurrent collectoractivation energies1 atm