Support‐dependent activity of noble metal substituted oxide catalysts for the water gas shift reaction

Deshpande, Parag A.; Madras, Giridhar

doi:10.1002/aic.12177

Cited by 41 publications

(13 citation statements)

References 70 publications

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“…Similar phenomena were also found in the water gas shift reaction. Some researchers suggested the atomically dispersed PGM species as active sites but others considered the PGM nanoparticles with positive state …”

Section: Introductionmentioning

confidence: 99%

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

et al. 2017

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This work reported the adsorption and reaction performance of FeOx supported subnanometer cluster and single‐atom Ir catalysts for the oxidation of CO at low temperature. By varying the pretreatment temperature and Ir loading, the single‐atom and subnanometer cluster Ir catalysts were obtained. The Ir subnanometer clusters exhibited higher activity for the oxidation of CO with or without the presence of H2 than the single‐atom counterpart. By using adsorption microcalorimetry and in situ infrared spectroscopy measurements, it was found that the Ir subnanometer clusters not only promoted the adsorption and reaction of CO and O2 but also facilitated the formation of OH species from reaction between H2 and O2, thus opening a new reaction pathway between CO and OH species to produce CO2 compared with that between CO and O species on the single‐atom counterpart. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4003–4012, 2017

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Section: Introductionmentioning

confidence: 99%

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

et al. 2017

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“…This phenomenon is known and reported for the reactions like CO oxidation and also for the dissociation of H 2 O for the case of the water-gas shift reaction. 15,33 This particular step is unique only for the case of reducible oxides in which the splitting of the oxygen takes place on oxygen deficient sites. This step results in the reoxidation of the support by utilization of a part of O 2 from the stream.…”

Section: Modeling Chc Over Different Compoundsmentioning

confidence: 99%

“…We have previously investigated the watergas shift reaction over Pd and Pt ions, supported over different supports. 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.…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30] We have also found high activity of noble metal substituted CeO 2 and related solid solutions for CO oxidation and the water-gas shift reaction. 15,31 Following the structure-property relations, the catalysts were tested for CHC and room temperature activity of the catalysts was observed. 11,12 Since the activity of the catalyst is highly dependent upon the support, the current study is intended to explore different supports for the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…However, the involvement of the support in the reaction for ionic catalysts for the water-gas shift reaction and CHC has been established in our previous studies. 11,12,15 Therefore, in this study, different supports were used for the reaction and the role of the support for the reaction was established. Support dependent models for describing the course of the reaction were proposed.…”

Section: Introductionmentioning

confidence: 99%

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

2011

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) were tested for catalytic hydrogen combustion. The compounds were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. All the four compounds showed good activity and stability for catalytic hydrogen combustion and more than 95% conversion was observed over all the compounds within 500 C. The mechanisms for the reaction over the different classes of compounds (cerium-based and iron-based compounds) were proposed on the basis of spectroscopic observations. The main difference in the mechanisms was in the nature of adsorption of H 2 over the sites. The elementary processes for the reaction were proposed, corresponding rate expressions were derived, and the rate parameters for the reaction were estimated using nonlinear regression. Langmuir-Hinshelwood and Eley-Rideal mechanisms were also tested for the reaction and the proposed mechanism was compared with these mechanisms. V V C 2011 American Institute of Chemical Engineers AIChE J, 58: 932-945, 2012

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Enhanced oxygen mobility and reactivity for ethanol steam reforming

Zhang

et al. 2011

AIChE Journal

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This article describes a strategy for increasing oxygen storage capacity (OSC) of ethanol steam reforming (ESR) catalysts. Sintering and carbon deposition are major defects of nickel-based catalysts for ESR; tuning oxygen mobility (OM) of CeO 2 -based supports can overcome these drawbacks and promote H 2 production. We have successfully increased OSC and OM by adding Mg into the lattice of Ni/CeO 2 to promote H 2 production in ESR. The insertion of Mg into the CeO 2 lattice efficiently promotes the reduction of Ce 4þ according to X-ray powder diffraction (XRD) and temperature-programmed reduction (TPR) analysis. Mg-modified Ni/CeO 2 catalysts have larger OSC and smaller nickel crystallite size compared with bare Ni/CeO 2 . The optimal Mg addition is 7 mol % (Ni/7MgCe) with the best OM. We also present evidence indicating that Mg addition significantly promotes ethanol conversion and H 2 production in ESR, and that Ni/7MgCe yields the best performance due to the high OM of the support. These Mg-modified catalysts also produce less carbon deposition compared with Ni/ CeO 2 , and the amount of deposited carbon decreases with increasing Mg addition. Ni/ 7MgCe has the best resistance to carbon deposition owing to the excellent OM.

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Support‐dependent activity of noble metal substituted oxide catalysts for the water gas shift reaction

Cited by 41 publications

References 70 publications

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

More active Ir subnanometer clusters than single‐atoms for catalytic oxidation of CO at low temperature

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

Enhanced oxygen mobility and reactivity for ethanol steam reforming

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