Determining Number of Active Sites and TOF for the High-Temperature Water Gas Shift Reaction by Iron Oxide-Based Catalysts

被引：38

作者：

Zhu, Minghui ^{[1
]}

Wachs, Israel E. ^{[1
]}

机构：

[1] Lehigh Univ, Operando Mol Spect & Catalysis Lab, Dept Chem & Biomol Engn, Bethlehem, PA 18015 USA

来源：

ACS CATALYSIS | 2016年 / 6卷 / 03期

基金：

美国国家科学基金会;

关键词：

water-gas shift; iron-based; isotope switch; promoters; number of active sites; turnover frequency; surface oxygen; CHROMIA-PROMOTED MAGNETITE; IN-SITU; ADSORPTION; STATIONARY; DESORPTION; FE3O4(111); KINETICS; STATE; CO;

D O I：

10.1021/acscatal.5b02961

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：

This study demonstrates, with (CO2)-O-16/(CO2)-O-18 isotope switch and H-2-TPR experiments, for the first time that (i) the high-temperature water gas shift (HT-WGS) reaction by copper-chromium-iron oxide catalysts follows a redox mechanism dominated by the surface layer, (ii) the number of catalytic active sites can be quantified by the isotopic switch, and (iii) the turnover frequency (TOF) can be determined from knowledge of the number of sites. The quantitative TOF values reveal that chromium is only a textural promoter, whereas copper is a chemical promoter.

引用

页码：1764 / 1767

页数：4

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