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Properties of PdAg/Al2O3 Egg–Shell Single-Atom Catalysts in Front-End Hydrogenation of Acetylene
https://orcid.org/https://orcid.org/0000-0002-0867-0645
https://orcid.org/https://orcid.org/0000-0003-1545-1763
https://orcid.org/https://orcid.org/0000-0001-7841-835X
https://orcid.org/https://orcid.org/0000-0001-6911-0070
https://orcid.org/https://orcid.org/0000-0001-7405-9601
Two samples of PdAg/Al2O3 egg–shell single-atom catalysts, with Ag/Pd ratios of 1 : 1 and 3 : 1, were synthesized and characterized by TEM, XPS, and DRIFTS-CO methods. The formation of bimetallic PdAg alloy nanoparticles with single-atom Pd1 active sites was demonstrated. Furthermore, a physicochemical characterization showed a egg–shell distribution of the active component. The catalytic performance of the samples was tested in front-end selective hydrogenation of acetylene. The H2/C2H2 ratio in the model mixture was varied from 20 to 60. Under front-end acetylene hydrogenation conditions, the highest ethylene selectivity (about 87 at 90% acetylene conversion) was achieved in the presence of the Pd1Ag3/Al2O3 catalyst at H2/C2H2 = 20. Finally, it was shown that, unlike the monometallic Pd catalyst, the Ag-promoted catalysts were completely free of any local thermal runaway effect.
Properties of PdAg/Al2O3 Egg–Shell Single-Atom Catalysts in Front-End Hydrogenation of Acetylene
https://orcid.org/https://orcid.org/0000-0002-0867-0645
https://orcid.org/https://orcid.org/0000-0003-1545-1763
https://orcid.org/https://orcid.org/0000-0001-7841-835X
https://orcid.org/https://orcid.org/0000-0001-6911-0070
https://orcid.org/https://orcid.org/0000-0001-7405-9601
Two samples of PdAg/Al2O3 egg–shell single-atom catalysts, with Ag/Pd ratios of 1 : 1 and 3 : 1, were synthesized and characterized by TEM, XPS, and DRIFTS-CO methods. The formation of bimetallic PdAg alloy nanoparticles with single-atom Pd1 active sites was demonstrated. Furthermore, a physicochemical characterization showed a egg–shell distribution of the active component. The catalytic performance of the samples was tested in front-end selective hydrogenation of acetylene. The H2/C2H2 ratio in the model mixture was varied from 20 to 60. Under front-end acetylene hydrogenation conditions, the highest ethylene selectivity (about 87 at 90% acetylene conversion) was achieved in the presence of the Pd1Ag3/Al2O3 catalyst at H2/C2H2 = 20. Finally, it was shown that, unlike the monometallic Pd catalyst, the Ag-promoted catalysts were completely free of any local thermal runaway effect.
Properties of PdAg/Al2O3 Egg–Shell Single-Atom Catalysts in Front-End Hydrogenation of Acetylene
https://orcid.org/https://orcid.org/0000-0002-0867-0645
https://orcid.org/https://orcid.org/0000-0003-1545-1763
https://orcid.org/https://orcid.org/0000-0001-7841-835X
https://orcid.org/https://orcid.org/0000-0001-6911-0070
https://orcid.org/https://orcid.org/0000-0001-7405-9601
Two samples of PdAg/Al2O3 egg–shell single-atom catalysts, with Ag/Pd ratios of 1 : 1 and 3 : 1, were synthesized and characterized by TEM, XPS, and DRIFTS-CO methods. The formation of bimetallic PdAg alloy nanoparticles with single-atom Pd1 active sites was demonstrated. Furthermore, a physicochemical characterization showed a egg–shell distribution of the active component. The catalytic performance of the samples was tested in front-end selective hydrogenation of acetylene. The H2/C2H2 ratio in the model mixture was varied from 20 to 60. Under front-end acetylene hydrogenation conditions, the highest ethylene selectivity (about 87 at 90% acetylene conversion) was achieved in the presence of the Pd1Ag3/Al2O3 catalyst at H2/C2H2 = 20. Finally, it was shown that, unlike the monometallic Pd catalyst, the Ag-promoted catalysts were completely free of any local thermal runaway effect.
Properties of PdAg/Al2O3 Egg–Shell Single-Atom Catalysts in Front-End Hydrogenation of Acetylene
Pet. Chem.
Mashkovsky, I. S. (Autor:in) / Markov, P. V. (Autor:in) / Baeva, G. N. (Autor:in) / Smirnova, N. S. (Autor:in) / Vaulina, A. E. (Autor:in) / Mel’nikov, D. P. (Autor:in) / Stakheev, A. Yu. (Autor:in)
Petroleum Chemistry ; 64 ; 1159-1168
01.09.2024
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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