Preparing uniform supported Pd-Ni catalysts with citrate-assisted impregnation

Kristiaan H. Helfferich, Charles A. Fabrie, Johannes D. Meeldijk, George F. Tierney, Jessi E.S. van der Hoeven, Peter J. van den Brink, Krijn P. de Jong, Petra E. de Jongh*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Bimetallic supported catalysts can show synergistic effects compared to their monometallic constituents. However, it is challenging to produce bimetallic catalysts with a uniform nanoparticle distribution over the support, while ensuring each nanoparticle contains both metals. A promising strategy is to use impregnation precursors that facilitate uniform distribution of both metals over a support. In this work, citrate-based precursors were studied to prepare bimetallic Pd-Ni nanoparticles supported on SBA-15 mesoporous silica. Amongst others, cryo-electron microscopy demonstrated the excellent distribution of Ni citrate precursor after drying. Co-impregnation with Ni citrate precursor and Pd(OAc)2 or Pd(NH3)4(NO3)2 produced well-distributed Pd-Ni nanoparticles with a narrow particle size distribution. Extensive characterization with STEM-EDX, EXAFS and TPR showed that the type of Pd precursor controlled the Pd to Ni nanoscale intimacy. CO2 hydrogenation experiments demonstrated that increasing Pd-Ni intimacy decreased the activity. Our strategy to produce uniform Pd-Ni nanoparticles using citric acid is relevant also for other bimetallic systems.

Original languageEnglish
Article number115624
Number of pages11
JournalJournal of Catalysis
Volume436
DOIs
Publication statusPublished - Aug 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

Funding

This research was funded by the Advanced Research Center for Chemical Building Blocks Consortium (ARC CBBC) , co-funded by the ministry of Education, Culture and Science of the government of the Netherlands (NWO) as well as Shell Global Solutions International B.V. and BASF. We acknowledge SOLEIL for provision of synchrotron radiation facilities at ROCK beamline (proposal 20221222) . The work atROCK was supported by a public grant of the French National Research Agency (ANR) as part of the "Investissements d'Avenir" program (reference : ANR-10-EQPX-45) . We thank Anthony Beauvois and Valerie Briois for their support with the XAS measurements. The authors would like to thank Nienke Visser, Laura Barberis for assisting with the CO 2 hydrogenation measurements and Jan-Willem de Rijk and Dennie Wezendonk for their technical support.r ROCK was supported by a public grant of the French National Research Agency (ANR) as part of the "Investissements d'Avenir" program (reference : ANR-10-EQPX-45) . We thank Anthony Beauvois and Valerie Briois for their support with the XAS measurements. The authors would like to thank Nienke Visser, Laura Barberis for assisting with the CO 2 hydrogenation measurements and Jan-Willem de Rijk and Dennie Wezendonk for their technical support.

FundersFunder number
Australian Research Council
Advanced Research Center for Chemical Building Blocks consortium
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Shell Global Solutions International
Ministerie van onderwijs, cultuur en wetenschap
Agence Nationale de la RechercheANR-10-EQPX-45
BASF20221222

    Keywords

    • Bimetallic catalyst
    • Heterogeneous catalysis
    • Pd-Ni

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