Optimizing Pd:Zn molar Ratio in PdZn/CeO2 for CO2 Hydrogenation to Methanol

Opeyemi A. Ojelade, Sharif F. Zaman, Muhammad A. Daous, Abdulrahim A. Al-Zahrani, Ali S. Malik, Hafedh Driss, Genrikh Shterk, Jorge Gascon

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We report the compositional optimization of Pd:Zn/CeO2 catalysts prepared via sol-gel chelatization for the hydrogenation of CO2 under mild reaction conditions. The formation of a PdZn alloy, which is the main active phase for this reaction, was maximized for the catalyst with a Pd to Zn ratio close to 1. For this catalyst, a maximum conversion of 14%, close to thermodynamic equilibrium, and high selectivity to methanol (95%) were achieved at 220 °C, 20 bar, 2400 h−1 GHSV and H2:CO2 stoichiometric ratio of 3:1. The formation of PdZn alloys was achieved by reducing the catalyst precursor at 550 °C under hydrogen flow and confirmed by XRD. XPS study confirmed the presence of Pd°, being maximum for the optimized catalyst composition. At lower temperature, i.e. 180 °C, 1.0PdZn catalyst showed 100% selectivity to methanol with 8% CO2 conversion. RWGS reaction is responsible for the production of CO and its selectivity increases with temperature. In situ DRIFTS suggests that CO2 is activated as adsorbed CO3- species over CeO2. Surface micro-kinetics demonstrates that methanol can be formed either via formaldehyde or formic acid surface intermediates.
Original languageEnglish (US)
Pages (from-to)117185
JournalApplied Catalysis A: General
StatePublished - Jul 30 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): JP-19-001
Acknowledgements: This joint project was co-founded by King Abdulaziz University (KAU), Jeddah, and King Abdullah University of Science and Technology (KAUST), Thuwal, under grant number “JP-19-001”. The authors, therefore, acknowledge KAU and KAUST for their technical and financial support.


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