Competition of propylene hydrogenation and epoxidation over Au-Pd/TS-1 bimetallic catalysts for gas-phase epoxidation of propylene with O2 and H2

Li, Zhishan; Su, Ziyi; Ma, Wenhui; Zhong, Qin

doi:10.1016/j.apcata.2021.118060

Cited by 17 publications

(6 citation statements)

References 44 publications

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“…In this work, propylene hydrogenation occurred on Pd sites, and its epoxidation takes place at Au−Ti sites on 100 °C, where proper composition of reaction mixture plays a crucial role for obtaining highest yield in desired conversion. 158 4.2. Hydrogenation Reactions.…”

Section: Applications Of Supported Pd−au Bmcs In Organic Synthesismentioning

confidence: 99%

Section: Applications Of Supported Pd–au Bmcs In Organic Synthesismentioning

confidence: 99%

“…In addition, one more recent work revealed the gas-phase in situ formation of H 2 O 2 from H 2 and O 2 , which was found to be responsible for epoxidation of propylene, and the transformation was catalyzed by Pd 0.8 -Au 1 BMC supported on Ti silicalite-1. In this work, propylene hydrogenation occurred on Pd sites, and its epoxidation takes place at Au–Ti sites on 100 °C, where proper composition of reaction mixture plays a crucial role for obtaining highest yield in desired conversion …”

Section: Applications Of Supported Pd–au Bmcs In Organic Synthesismentioning

confidence: 99%

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Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

2022

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Supported Pd−Au bimetallic catalysts (BMCs) have attracted remarkable research interest because they can efficiently execute various important organic transformations. The major concern for launching Pd−Au bimetallic catalysis is either to perform the reaction with good atom economy under low catalyst/ metal loading or to introduce a reaction, which cannot be performed by its monometallic variants. The supports being applied for Pd−Au alloy also have been examined for their crucial role to perform a particular reaction accredited to combined synergistic effects in the catalyst. The optimized tuning between the catalyst support and the Pd/Au ratio always have been a deciding key factor for selectivity, stability, and activity of these catalysts as suggested by various mechanistic studies. Herein, we have summarized the recent advances in supported Pd−Au BMCs in terms of design strategies, characterizations for deep insight mechanistic study during the reaction course. This Review begins with a brief history and adopted methods for preparation of these catalysts followed by categorization of supporting material being applied either directly or after modification. Furthermore, quick glances of catalyst characterization, effects on conversion and selectivity, catalyst activation, and deactivation under the studied reaction parameters for respective organic transformations also have been included in the above-mentioned sections. The main purpose of catalyst development is to accomplish easy access of tedious reactions with good conversion rate and selectivity toward desired product. Therefore, in view of the application part for Pd−Au BMCs, we have tried to cover all basic and important organic reactions along with their substrate scope range and mechanistic studies. This present Review could be really useful for researchers working in this dimension via providing them a clear catalyst design idea, preparation method, support selection strategy, and right substrate screening for carrying out the targeted synthetic transformation.

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Section: Applications Of Supported Pd−au Bmcs In Organic Synthesismentioning

confidence: 99%

Section: Applications Of Supported Pd–au Bmcs In Organic Synthesismentioning

confidence: 99%

Section: Applications Of Supported Pd–au Bmcs In Organic Synthesismentioning

confidence: 99%

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Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

2022

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“…56 The broadband centered at 3400 cm À1 corresponds to the presence of hydroperoxyl (OOH) species, which proves that the process is accompanied by the formation of hydroperoxyl species. [57][58][59][60] In the presence of propylene and PO, absorptions at 3105, 3090, 3077, 3000, 2955, 2916, and 2890 cm À1 can be identied in the C-H stretching region. Bands arising at 1660 and 1730 cm À1 are assigned to the C]O stretching vibrations, suggesting that C]O-containing species, like acetone and propanal, were formed in the reaction.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Au supported defect free TS-1 for enhanced performance of gas phase propylene epoxidation with H₂ and O₂

Qiu

et al. 2022

Sustainable Energy Fuels

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“…Se ha encontrado que las interacciones intermetálicas en catalizadores bimetálicos conducen a una mejora en el rendimiento catalítico [21,23]. Estos catalizadores bimetálicos han mostrado ser efectivos en una amplia gama de aplicaciones, como la hidrogenación de hidrocarburos insaturados [24], oxidación de CO [25], epoxidación de propileno [26], desplazamiento de gas de agua [27,28], entre otras.…”

Section: Introductionunclassified

Estudio teórico de la oxidación de CO con O2 usando catalizadores de Au-Pd y Au-Pt

Garzón

Rodríguez²,

Osorio³

et al. 2022

Rev. Colomb. Quim.

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En el presente estudio se realizaron cálculos con base en la Teoría del Funcional de la Densidad Electrónica (DFT) con la aproximación B3PW91/LANL2DZ para optimizar los sistemas monometálicos y bimetálicos Au9, Au8Pd, Au8Pt, AuPd8, AuPt8, Pd9 y Pt9. Los materiales fueron teóricamente evaluados como catalizadores para la oxidación de monóxido de carbono (CO) y se determinó el sistema más favorable para la adsorción de esta molécula. La sustitución de átomos de Pt y Pd por átomos de Au en los nonámeros generó un cambio en la estructura tridimensional del sistema. El análisis de reactividad global mostró que el clúster más reactivo es 𝑃𝑡9, seguido por 𝐴𝑢𝑃𝑡8. Los índices de Fukui identificaron los sitios más susceptibles para un ataque nucleofílico de ambos clústeres. La adsorción de CO generó una cascada de oxidación que liberó ~4,5 eV, indicando que la reacción es altamente exotérmica y exergónica. Los clústeres 𝐴𝑢𝑃𝑡8 y 𝑃𝑡9 mostraron los valores más bajos de energía de activación de la etapa determinante del mecanismo. En general, la sustitución de un átomo de platino (o paladio) por un átomo de oro no afecta la reactividad de los nonámeros y, por tanto, se infiere que el clúster 𝐴𝑢𝑃𝑡8 podría ser un catalizador promisorio en la oxidación de CO.

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Competition of propylene hydrogenation and epoxidation over Au-Pd/TS-1 bimetallic catalysts for gas-phase epoxidation of propylene with O2 and H2

Cited by 17 publications

References 44 publications

Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

Au supported defect free TS-1 for enhanced performance of gas phase propylene epoxidation with H₂ and O₂

Estudio teórico de la oxidación de CO con O2 usando catalizadores de Au-Pd y Au-Pt

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Competition of propylene hydrogenation and epoxidation over Au-Pd/TS-1 bimetallic catalysts for gas-phase epoxidation of propylene with O2 and H2

Cited by 17 publications

References 44 publications

Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study

Au supported defect free TS-1 for enhanced performance of gas phase propylene epoxidation with H2 and O2

Estudio teórico de la oxidación de CO con O2 usando catalizadores de Au-Pd y Au-Pt

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Product

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Au supported defect free TS-1 for enhanced performance of gas phase propylene epoxidation with H₂ and O₂