Cu/ZnO/CeO2 Supported on MOF-5 as a Novel Catalyst for the CO2 Hydrogenation to Methanol: A Mechanistic Study on the Effect of CeO2 and MOF-5 on Active Sites

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Abstract

Cu/ZnO/CeO 2 nanocomposite was supported on metal organic framework (MOF-5) to enhance active sites dispersion and control the nanoparticles agglomeration during synthesis through strong metal-support interactions. The incorporation of MOF-5 alleviated the obstacle facing the commercial ternary Cu/ZnO/Al 2O 3 regarding low surface area due to nanoparticles agglomeration. In addition, Cu/ZnO/CeO 2@MOF-5 gave higher methanol selectivity than the commercial catalyst which can be accounted for by the interfacial sites generated between MOF-5 and Cu/ZnO which favour methanol synthesis over carbon monoxide through regulating the intermediates bonding energies. CeO 2 as support for Cu/ZnO nanoparticles was also compared with commercial support and showed to have led to smaller particle size and superior dispersion of Cu active sites as well. Cu/ZnO/CeO 2@MOF-5 resulted in methanol STY of 23.3 mg g cat h −1 and selectivity of 79% at mild reaction temperature (260 °C) and pressure (10 bar). Two different MOFs including cerium based MOF and ZIF-8 demonstrated inferior performance compared to MOF-5. Graphical Abstract: (Figure presented.)

Original languageEnglish
Pages (from-to)3157-3173
Number of pages17
JournalCatalysis Letters
Volume154
Issue number7
DOIs
Publication statusPublished - 8 Jan 2024

Keywords

  • CO hydrogenation
  • Cu-based catalyst
  • Cu/ZnO/CeO
  • Metal-support interaction
  • Metal–organic framework (MOF)
  • Methanol synthesis

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