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

被引：13

作者：

Bukhtiyarov, A. V. ^{[1
,4
]}

Panafidin, M. A. ^{[1
]}

Prosvirin, I. P. ^{[1
]}

Mashkovsky, I. S. ^{[2
]}

Markov, P. V. ^{[1
,2
]}

Rassolov, A. V. ^{[2
]}

Smirnova, N. S. ^{[1
,2
]}

Baeva, G. N. ^{[2
]}

Rameshan, C. ^{[3
]}

Rameshan, R. ^{[3
]}

Zubavichus, Y. V. ^{[1
]}

Bukhtiyarov, V. I. ^{[1
]}

Stakheev, A. Yu. ^{[2
]}

机构：

[1] Boreskov Inst Catalysis, Lavrentieva ave 5, Novosibirsk 630090, Russia

[2] ND Zelinskii Inst Organ Chem, Leninsky Prospect 47, Moscow 119991, Russia

[3] Tech Univ Wien, Inst Mat Chem, Getreidemarkt 9-BC-01, A-1060 Vienna, Austria

[4] RAS, Boreskov Inst Catalysis SB, Lavrentieva Ave 5, Novosibirsk 630090, Russia

来源：

APPLIED SURFACE SCIENCE | 2022年 / 604卷

基金：

俄罗斯科学基金会;

关键词：

Near-ambient pressure X-ray photoelectron; spectroscopy; CO adsorption-induced segregation; Pd-Ag bimetallic catalysts; Acetylene hydrogenation; In situ measurements; SURFACE SEGREGATION; AG/HOPG CATALYSTS; IN-SITU; PD; PERFORMANCE; AG; DEACTIVATION; ADSORPTION; OXIDATION; ETHYLENE;

D O I：

10.1016/j.apsusc.2022.154497

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 ?. 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 ? 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.

引用

页数：7

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