Wijaya, Yanuar Philip Putra, Robertus D. D. Smith, Kevin J. Kim, Chang Soo Gyenge, Elod L. 2024-01-19T13:34:05Z 2024-01-19T13:34:05Z 2022-01-10 2021-10 2168-0485 https://pubs.kist.re.kr/handle/201004/116344 The electrocatalytic reduction of guaiacol, a lignin model compound, is investigated in a stirred slurry electrocatalytic reactor (SSER) under mild conditions (1 atm, 30-60 degrees C). Methanesulfonic acid (MSA) is used as an electrolyte due to its ecofriendly 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. English American Chemical Society Guaiacol Hydrogenation in Methanesulfonic Acid Using a Stirred Slurry Electrocatalytic Reactor: Mass Transport and Reaction Kinetics Aspects Article 10.1021/acssuschemeng.1c03332 1 ACS Sustainable Chemistry & Engineering, v.9, no.39, pp.13164 - 13175 ACS Sustainable Chemistry & Engineering 9 39 13164 13175 N scie scopus 000705367800005 2-s2.0-85116653484 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Engineering, Chemical Chemistry Science & Technology - Other Topics Engineering Article SOLVENT FUELS THERMAL CATALYSIS PHENOL CYCLOHEXANONE HYDRODEOXYGENATION CONVERSION OXIDATION PLATINUM electrocatalytic hydrogenation biomass valorization lignin guaiacol methanesulfonic acid