Mechanistic aspects of the water–gas shift reaction on alumina-supported noble metal catalysts: In situ DRIFTS and SSITKA-mass spectrometry studies

The role of external acid sites of ZSM-5 in deactivation of hybrid CuZnAl/ZSM-5 catalyst for direct dimethyl ether synthesis from syngas

“…The acid sites in pores of the parent non-silylated zeolites are neutralized by migrating Cu 2+ ions. At the same time, these catalysts can show a higher activity in WGS reaction which can be due to easier water dissociation over Cu 2+ ions [50]. At the same time, silylation of zeolite outer surface hinders copper migration into zeolite pores.…”

Structuring Pt/CeO2/Al2O3 WGS catalyst: Introduction of buffer layer

“…Olimpiou et al [49] use SSITKA methodology for investigating the "H-path", the reaction pathway of the WGS reaction that results in the formation of H2 from H2O. These authors estimate the coverage of H-containing species for γ-Al2O3-supported Pt and Rh and state that labile hydroxyl groups and H species coming from dissociated water are involved in the reaction.…”

Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

“…Similarly for alumina-based catalysts, active OH/H species were reported to retain on alumina showing the role of the support in the reaction. 18, 19 Sharma and Hegde 13 have also compared the activities of different catalysts and have found that different supports showed different rates of reaction. Therefore, it is important to determine the effect of support on the kinetics and mechanism of the reaction, and also explore different materials as potential supports for the reaction.…”

“…15 It was found that both kinetics as well as mechanism of the reaction differed for different supports, and the support played an important role in the activity of the catalyst. Efstathiou and coworkers [16][17][18][19] have also investigated the effect of metal and the support on the kinetics and mechanism of the water-gas shift reaction. Both steady state as well as transient isotope studies by Kalamaras et al 16,17 have shown the involvement of the support in the reaction with the kinetics of the reaction being governed by the processes at the interface of the metal and the support.…”