Boosting the Activity of PdAg2/Al2O3 Supported Catalysts Towards the Selective Acetylene Hydrogenation by Means of CO-Induced Segregation: A Combined NAP XPS and Mass-Spectrometry Study Full article
| Journal |
Applied Surface Science
ISSN: 0169-4332 |
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| Output data | Year: 2022, Volume: 604, Article number : 154497, Pages count : 7 DOI: 10.1016/j.apsusc.2022.154497 | ||||||
| Tags | Near-ambient pressure X-ray photoelectron spectroscopy; CO adsorption-induced segregation; Pd-Ag bimetallic catalysts; Acetylene hydrogenationIn situ measurements | ||||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 19-13-00285-П |
Abstract:
Selective hydrogenation (or semi-hydrogenation) of acetylene into ethylene is an important industrial process. The aim of the present work is thus to learn regularities governing the CO-induced segregation and elaborate practical procedures for tuning the surface structure of Pd-Ag nanoparticles to improve their catalytic performance towards the selective hydrogenation of acetylene to ethylene. Utilizing NAP XPS the CO adsorption-induced Pd atoms segregation in supported PdAg2/Al2O3 catalysts already at room temperature has been shown. The surface enrichment with Pd further increases if the treatment temperature is increased up to 250 °C. This specific configuration with a redistributed Pd/Ag surface atomic ratio is appreciably stable and self-sustained even at the absence of CO at moderately elevated temperatures. Nevertheless, a reductive treatment in hydrogen at 450 °C reverts the nanoparticle surface structure to the pristine state. Catalytic properties of this peculiar CO-induced configuration of PdAg2/Al2O3 towards the selective acetylene hydrogenation was investigated using a combination of NAP XPS and MS techniques. The PdAg2/Al2O3 catalyst with the surface enriched with Pd due to the CO-induced segregation manifests improved activity with 100 % selectivity under the conditions used. The results obtained clearly demonstrate that CO adsorption-induced segregation is a powerful tool that can be used to optimize the surface composition and catalytic performance of bimetallic nanoparticles.
Cite:
Bukhtiyarov A.V.
, Panafidin M.A.
, Prosvirin I.P.
, Mashkovsky I.S.
, Markov P.V.
, Rassolov A.V.
, Smirnova N.S.
, Baeva G.N.
, Rameshan C.
, Rameshan R.
, Zubavichus Y.V.
, Bukhtiyarov V.I.
, Stakheev A.Y.
Boosting the Activity of PdAg2/Al2O3 Supported Catalysts Towards the Selective Acetylene Hydrogenation by Means of CO-Induced Segregation: A Combined NAP XPS and Mass-Spectrometry Study
Applied Surface Science. 2022. V.604. 154497 :1-7. DOI: 10.1016/j.apsusc.2022.154497 WOS Scopus РИНЦ ANCAN OpenAlex
Boosting the Activity of PdAg2/Al2O3 Supported Catalysts Towards the Selective Acetylene Hydrogenation by Means of CO-Induced Segregation: A Combined NAP XPS and Mass-Spectrometry Study
Applied Surface Science. 2022. V.604. 154497 :1-7. DOI: 10.1016/j.apsusc.2022.154497 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | May 23, 2022 |
| Accepted: | Aug 5, 2022 |
| Published online: | Aug 10, 2022 |
| Published print: | Dec 1, 2022 |
Identifiers:
| Web of science: | WOS:000868432100001 |
| Scopus: | 2-s2.0-85135793038 |
| Elibrary: | 53763551 |
| Chemical Abstracts: | 2022:2126328 |
| Chemical Abstracts (print): | 180:54322 |
| OpenAlex: | W4291172270 |