Insight into the true role of hydrogen-carbonate species in CO oxidation over Pd/Al2O3 catalyst using SSITKA-transmission IR technique

被引：1
作者：
Hatoum, Ibrahim [1 ]
Richard, Melissandre [1 ]
Dujardin, Christophe [1 ]
机构：
[1] Univ Artois, Univ Lille, Unite Catalyse & Chim Solide, CNRS, F-59000 Lille, France
来源：
CATALYSIS COMMUNICATIONS | 2023年 / 179卷
关键词：
CO oxidation; SSITKA; Operando IR spectroscopy; Hydrogen-carbonate; Mechanism; Palladium; LOW-TEMPERATURE; WATER; ADSORPTION; OXYGEN;
D O I：
10.1016/j.catcom.2023.106684
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 powerful combination of steady state isotopic transient kinetic analysis (SSITKA) and operando infrared spectroscopy (IR) was applied to study the CO oxidation reaction on Pd-supported Al2O3 catalyst at low tem-perature. The aim was to reveal the true role of hydrogen-carbonate species in the reaction mechanism. The SSITKA-IR experiments, conducted in presence and absence of CO2 in the gas feed, have confirmed that hydrogen-carbonate species behave as spectator species in the reaction. Its formation was due to re-adsorption of the CO2 product itself on the alumina surface as confirmed by the direct 12CO2/13CO2 exchange observed on the bare support.
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页数：7
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