Reduction of iron oxide by hydrogen spillover over Pt/TiO2 and Pt/Al2O3 surfaces

Yewale, Abhishek D.; Kherdekar, Pranav V.; Bhatia, Divesh

doi:10.1016/j.ces.2021.117281

Cited by 15 publications

(6 citation statements)

References 56 publications

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“…Accordingly, the hydrogen spillover rate could be controlled by H ad diffusion coefficient at the boundary. Similar treatment could also be found in some hydrogen spillover experiments and models. , …”

Section: Theoretical Modelingsupporting

confidence: 74%

“…Similar treatment could also be found in some hydrogen spillover experiments and models. 29,30 Hydrogen spillover needed to break bonds with Ni active sites (site Ni) and form new bonds with Cu active sites (site Cu). As such, the surface diffusion coefficient for spillover (D s ) was determined by the height of energy barrier for hydrogen spillover, which depended on the hydrogen adsorption pressure and temperature.…”

Section: Mathematical Modelsmentioning

confidence: 99%

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Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

et al. 2022

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Accelerating electrocatalytic water splitting via hydrogen spillover has received increasing attention. However, the underlying mechanism of hydrogen spillover on hydrogen evolution is still ambiguous. Herein, a simulation study was carried out to determine the role of hydrogen spillover in pH- and potential-dependent hydrogen evolution over the NiCu bimetal catalyst. It was found that the current density was most prominently improved by hydrogen spillover in the neutral condition at −0.35 to −0.2 V vs reversible hydrogen electrode. By the parameter study, it was indicated that the potential and pH could improve the effect of hydrogen spillover on the current density by altering the surface reaction rates which include the hydrogen adsorption and desorption rates on the Ni and Cu particles. The pH would also affect the current density enhancement from the hydrogen spillover by the mass transfer limitation. To effectively utilize the hydrogen spillover for improved electrocatalytic hydrogen production, managing the surface reaction rate was important. Typically, the key principle was increasing the hydrogen adsorption rate of hydrogen donors and hydrogen desorption rate of hydrogen acceptors in the presence of hydrogen spillover. This fundamental understanding of hydrogen spillover contributes to the development of advanced electrocatalytic systems for hydrogen production.

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Section: Theoretical Modelingsupporting

confidence: 74%

Section: Mathematical Modelsmentioning

confidence: 99%

Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

et al. 2022

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“…This removal of oxygen leaves behind two‐electron into the localized 4 f orbital of the two Ce atoms [24,25] . Similar support (metal oxide) reduction phenomena due to hydrogen spillover have been previously reported [26,27] . Hence oxygen vacancy formation and H 2 spillover are interconnected.…”

Section: Resultssupporting

confidence: 72%

“…[24,25] Similar support (metal oxide) reduction phenomena due to hydrogen spillover have been previously reported. [26,27] Hence oxygen vacancy formation and H 2 spillover are interconnected. The prior art suggests the promotional role of H adatoms hydrogen spillover to the activity of methanol synthesis catalyst.…”

Section: Chemcatchemmentioning

confidence: 99%

Promotional Role of Oxygen Vacancy Defects and Cu−Ce Interfacial Sites on the Activity of Cu/CeO₂ Catalyst for CO₂ Hydrogenation to Methanol

2022

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Development of novel catalyst for CO2 conversion to methanol is still a challenge. A series of Cu/CeO2 catalyst were prepared by changing the synthesis procedure. The Cu/CeO2 catalyst were prepared by co‐precipitation, surfactant‐assisted co‐precipitation, and sol‐gel methods for CO2 hydrogenation to methanol are documented. The performance of these catalysts was evaluated to elucidate the role of catalytic properties. The Cu/CeO2 catalyst synthesized by the sol‐gel (Cu/CeO2−SG) method exhibited superior strong basic site density, Cu dispersion, and oxygen vacancy defects than co‐precipitation method. A correlation between strong basic site density, oxygen vacancies, and methanol space time yield was established. Moreover, the promotional role of Cu−Ce interfacial sites on the reduced Cu4t/CeO2(111) cluster in CO2 adsorption and activation has been reported by the DFT calculation. These experimental and theoretical results provide insights into Cu‐CeO2 interaction and role of metal‐support interactions in the CO2 hydrogenation reaction.

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“…The amount of spillover hydrogen, however, can be increased for supports which have defects . Recently, short-range spillover on Al 2 O 3 was confirmed at defect sites. , In addition, the doping of alkali cations on Al 2 O 3 can facilitate hydrogenation mediated by heterolytic hydrogen species . For alumina used in the industry, the number of sites for hydrogen spillover after high-temperature annealing is extremely low, so there is little hydrogen spillover.…”

Section: Introductionmentioning

confidence: 99%

Increased Hydrogenation Rates in Pd/La-Al₂O₃ Catalysts by Hydrogen Transfer O(-La) Sites Adjacent to Pd Nanoparticles

Chen

Yang

et al. 2022

ACS Catal.

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In this study, a simple bottom-up synthesis is presented to introduce atomically dispersed La into Al 2 O 3 followed by the addition of Pd to prepare a microspherical Pd/La-Al 2 O 3 catalyst with potential for hydrogenation applications. The Pd/La-Al 2 O 3 catalyst displays enhanced activity for a number of hydrogenation reactions and functional groups, for example, C�O, C�C, C�N, and aromatic rings. Incorporation of O(-La) sites adjacent to Pd nanoparticles (NPs) is suggested to reversibly transfer and store catalytically active hydrogen at the O(-La) site. A kinetic analysis of 2-ethylanthraquinone (EAQ) hydrogenation shows that the H 2 reaction order drops from one for Pd/Al 2 O 3 to zero for Pd/La-Al 2 O 3 , while the EAQ order remains unchanged. Incorporation of isolated O(-La) sites adjacent to the Pd NPs provides a feasible strategy for the design of high-efficiency hydrogenation catalysts and has important implications for the development of the commercial hydrogenation process.

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Reduction of iron oxide by hydrogen spillover over Pt/TiO2 and Pt/Al2O3 surfaces

Cited by 15 publications

References 56 publications

Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

Promotional Role of Oxygen Vacancy Defects and Cu−Ce Interfacial Sites on the Activity of Cu/CeO₂ Catalyst for CO₂ Hydrogenation to Methanol

Increased Hydrogenation Rates in Pd/La-Al₂O₃ Catalysts by Hydrogen Transfer O(-La) Sites Adjacent to Pd Nanoparticles

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Reduction of iron oxide by hydrogen spillover over Pt/TiO2 and Pt/Al2O3 surfaces

Cited by 15 publications

References 56 publications

Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

Simulation Study Reveals the Role of Hydrogen Spillover in pH- and Potential-Dependent Hydrogen Evolution over the NiCu Bimetal Catalyst

Promotional Role of Oxygen Vacancy Defects and Cu−Ce Interfacial Sites on the Activity of Cu/CeO2 Catalyst for CO2 Hydrogenation to Methanol

Increased Hydrogenation Rates in Pd/La-Al2O3 Catalysts by Hydrogen Transfer O(-La) Sites Adjacent to Pd Nanoparticles

Contact Info

Product

Resources

About

Promotional Role of Oxygen Vacancy Defects and Cu−Ce Interfacial Sites on the Activity of Cu/CeO₂ Catalyst for CO₂ Hydrogenation to Methanol

Increased Hydrogenation Rates in Pd/La-Al₂O₃ Catalysts by Hydrogen Transfer O(-La) Sites Adjacent to Pd Nanoparticles