title: Gold Nanoparticles Deposited on Surface Modified Carbon Xerogels as Reusable Catalysts for Cyclohexane C-H Activation in the Presence of CO and Water.
abstract: The use of gold as a promotor of alkane hydrocarboxylation is reported for the first time. Cyclohexane hydrocarboxylation to cyclohexanecarboxylic acid (up to 55% yield) with CO, water, and peroxodisulfate in a water/acetonitrile medium at circa 50 °C has been achieved in the presence of gold nanoparticles deposited by a colloidal method on a carbon xerogel in its original form (CX), after oxidation with HNO₃ (-ox), or after oxidation with HNO₃ and subsequent treatment with NaOH (-ox-Na). Au/CX-ox-Na behaves as re-usable catalyst maintaining its initial activity and selectivity for at least seven consecutive cycles. Green metric values of atom economy or carbon efficiency also attest to the improvement brought by this novel catalytic system to the hydrocarboxylation of cyclohexane.
authors.affiliation: Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. apribeiro@tecnico.ulisboa.pt.
authors.forename: Ana Paula da Costa
authors.initials: AP
authors.lastname: Ribeiro
authors.affiliation: Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. lmartins@deq.isel.ipl.pt.|Chemical Engineering Department, Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, R. Conselheiro Emídio Navarro, 1959-007 Lisboa, Portugal. lmartins@deq.isel.ipl.pt.
authors.forename: Luísa Margarida Dias Ribeiro de Sousa
authors.initials: LM
authors.lastname: Martins
authors.affiliation: Laboratório de Catálise e Materiais, Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. sonia.carabineiro@fe.up.pt.
authors.forename: Sónia Alexandra Correia
authors.initials: SA
authors.lastname: Carabineiro
authors.affiliation: Laboratório de Catálise e Materiais, Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. jlfig@fe.up.pt.
authors.forename: José Luís
authors.initials: JL
authors.lastname: Figueiredo
authors.affiliation: Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal. pombeiro@tecnico.ulisboa.pt.
authors.forename: Armando José Latourrette
authors.initials: AJ
authors.lastname: Pombeiro
mesh_terms: D002244:Carbon / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry; D002384:Catalysis; D003510:Cyclohexanes / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D013057:Spectrum Analysis; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D003510:Cyclohexanes; D005782:Gels; D014867:Water; D002244:Carbon; D006046:Gold; D002248:Carbon Monoxide
keywords: C-H activation; catalyst recycling; cyclohexane; gold nanoparticles; green metric; hydrocarboxylation; water