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dc.contributor.authorOjelade, Opeyemi A.
dc.contributor.authorZaman, Sharif F.
dc.contributor.authorDaous, Muhammad A.
dc.contributor.authorAl-Zahrani, Abdulrahim A.
dc.contributor.authorMalik, Ali S.
dc.contributor.authorDriss, Hafedh
dc.contributor.authorShterk, Genrikh
dc.contributor.authorGascon, Jorge
dc.date.accessioned2019-08-19T10:49:55Z
dc.date.available2019-08-19T10:49:55Z
dc.date.issued2019-07-30
dc.identifier.citationOjelade, O. A., Zaman, S. F., Daous, M. A., Al-Zahrani, A. A., Malik, A. S., Driss, H., … Gascon, J. (2019). Optimizing Pd:Zn molar Ratio in PdZn/CeO2 for CO2 Hydrogenation to Methanol. Applied Catalysis A: General, 117185. doi:10.1016/j.apcata.2019.117185
dc.identifier.doi10.1016/j.apcata.2019.117185
dc.identifier.urihttp://hdl.handle.net/10754/656511
dc.description.abstractWe 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.
dc.description.sponsorshipThis 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.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0926860X19303400
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Applied Catalysis A: General. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis A: General, [[Volume], [Issue], (2019-07-30)] DOI: 10.1016/j.apcata.2019.117185 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectPdZn alloy
dc.subjectCeO2
dc.subjectCitric acid
dc.subjectChelating agent
dc.subjectMethanol synthesis
dc.subjectDRIFTS
dc.titleOptimizing Pd:Zn molar Ratio in PdZn/CeO2 for CO2 Hydrogenation to Methanol
dc.typeArticle
dc.contributor.departmentAdvanced Catalytic Materials, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal, 23955, Saudi Arabia
dc.contributor.departmentChemical Engineering Program
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalApplied Catalysis A: General
dc.rights.embargodate2021-07-30
dc.eprint.versionPost-print
dc.contributor.institutionChemical and Materials Engineering Department, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah, 21589, Saudi Arabia
kaust.personShterk, Genrikh
kaust.personGascon, Jorge
kaust.grant.numberJP-19-001
refterms.dateFOA2019-11-14T13:07:27Z
dc.date.published-online2019-07-30
dc.date.published-print2019-07


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