Catalytic performance of a single atom Pd1Ag10/Al2O3 catalyst for the selective hydrogenation of acetylene: The role of CO-induced segregation

被引：2

作者：

Mashkovsky, I. S. ^{[1
]}

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

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

Bragina, G. O. ^{[1
]}

Baeva, G. N. ^{[1
]}

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

Panafidin, M. A. ^{[2
]}

Chetyrin, I. A. ^{[2
]}

Gerasimov, E. Yu. ^{[3
]}

Zubavichus, Y. V. ^{[2
]}

Stakheev, A. Yu. ^{[1
]}

机构：

[1] N D Zelinsky Inst Organ Chem, Leninsky Prosp 47, Moscow 119991, Russia

[2] Boreskov Inst Catalysis, Synchrotron Radiat Facil SKIF, Nikolsky Prosp 1, Koltsov 630559, Russia

[3] Boreskov Inst Catalysis, Acad Lavrentiev Prosp 5, Novosibirsk 630090, Russia

来源：

APPLIED SURFACE SCIENCE | 2025年 / 681卷

基金：

俄罗斯科学基金会;

关键词：

Pd-Ag nanoparticles; Single atom alloy; Adsorption-induced segregation; XPS; DRIFTS-CO; Selective hydrogenation; LIQUID-PHASE HYDROGENATION; SURFACE SEGREGATION; BIMETALLIC CATALYSTS; AG/HOPG CATALYSTS; PALLADIUM; AG; ADSORPTION; NANOPARTICLES; ENERGIES; ALLOYS;

D O I：

10.1016/j.apsusc.2024.161516

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：

The single-atom Pd catalysts based on silver-rich bimetallic compositions are known for their extremely high ethylene selectivity in the acetylene hydrogenation reaction; however, their activity is noticeably lower than that of traditional monometallic Pd catalysts. The aim of the work was to apply a method of CO-induced segregation to increase the concentration of single atom Pd-1 sites on the surface of Pd1Ag10/Al2O3 catalyst without noticeable formation of multiatomic Pd-n (n >= 2) ensembles. It has been experimentally established by DRIFTS-CO and XPS methods that the effect of 30 vol% CO exposure temperature on the increase of surface Pd-1 sites concentration in the range of 50 to 350 degrees C has a volcano-like dependence with a maximum at similar to 200-250 degrees C. The catalytic tests show a considerable enhancement in activity for samples treated in CO at 200-250 degrees C (the temperature of 100 % acetylene conversion is reduced by similar to 30 degrees C), while the C2H4 selectivity was similar for both freshly reduced and CO-treated catalysts. These results demonstrate the use of CO-induced segregation as a promising method for the controlled increase in the concentration of isolated Pd-1 sites to improve the activity of silver-rich palladium catalyst without compromising its selectivity.

引用

页数：10

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