Bimetallic palladium-supported halloysite nanotubes for low temperature CO oxidation: Experimental and DFT insights
| Autor: | Siham Y. AlQaradawi, Khaled A. Mahmoud, Walid Hassan, Yahia H. Ahmad, Amina S. Aljaber, Assem T. Mohamed, Ahmed Soliman |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Physics and Astronomy chemistry.chemical_element Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry Heterogeneous catalysis DFT 01 natural sciences Homogeneous distribution Halloysite Catalysis Bimetallic strip Halloysite nanotubes Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics CO oxidation 0104 chemical sciences Surfaces Coatings and Films Binary alloy chemistry Chemical engineering Transmission electron microscopy engineering 0210 nano-technology Palladium |
| Zdroj: | Applied Surface Science. 493:70-80 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.07.009 |
| Popis: | The design and fabrication of novel metal-supported catalysts for energy conversion and heterogeneous catalysis is a pivotal theme. Herein, we present the synthesis of bimetallic palladium nanoalloys supported on halloysite nanotubes, PdM@HNTs, where M = Co, Cu, and Ni and their catalytic performance towards CO oxidation. The synthesis procedure involves simple co-reduction of the metals precursors using NaBH4 on halloysite nanotubes support. The synthesized catalysts retain the tubular morphology of halloysite support with surface area of 90–107 m2 g−1. Transmission electron microscopy (TEM) revealed smaller size for bimetallic nanoparticles (6–8 nm) compared to Pd (14 nm). PdNi displayed the highest catalytic activity towards CO oxidation. Moreover, PdCo and PdNi demonstrated enhanced CO oxidation kinetics compared to PdCu and PdNi as revealed from the calculated activation energies. DFT calculations revealed that the order of catalytic activity is PdNi > PdCo > PdCu > Pd which is in agreement with the experimental results and that the adsorption energy of CO2 on the different catalysts has no apparent role in the whole activity of the catalyst. In conclusion, PdM@HNTs catalysts expressed homogeneous distribution for metallic nanoparticles as well as high dispersion and expressed promising potential to be applied in real flare control processes. This work was made possible by NPRP Grant no. NPRP 8-1912-1-354 from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are solely the responsibility of the authors. Appendix A Scopus |
| Databáze: | OpenAIRE |
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