Al2O3 Nanosheets Rich in Pentacoordinate Al3+ Ions Stabilize Pt‐Sn Clusters for Propane Dehydrogenation

Shi, Lei; Deng, Gao‐Ming; Li, Wen‐Cui; Miao, Shu; Wang, Qing‐Nan; Zhang, Weiping; Lu, An‐Hui

doi:10.1002/ange.201507119

Cited by 45 publications

(27 citation statements)

References 31 publications

(39 reference statements)

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“…Although DFT calculations predict slightly increased dehydrogenation barrier for Pt/Cu SAA, its higher propylene formation rate can be attributed to its better Pt dispersion compared with 0.1Pt/Al 2 O 3 (Pt dispersion = 29%). In terms of deactivation, a first-order deactivation model is used to estimate the catalyst stability 55 . The low deactivation rate of 0.0005 h −1 for 0.1Pt10Cu/Al 2 O 3 quantitatively demonstrates its high stability when compared to 0.07 h −1 for 0.1Pt/Al 2 O 3 (Supplementary Table 9 ).…”

Section: Resultsmentioning

confidence: 99%

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

et al. 2018

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Noble-metal alloys are widely used as heterogeneous catalysts. However, due to the existence of scaling properties of adsorption energies on transition metal surfaces, the enhancement of catalytic activity is frequently accompanied by side reactions leading to a reduction in selectivity for the target product. Herein, we describe an approach to breaking the scaling relationship for propane dehydrogenation, an industrially important reaction, by assembling single atom alloys (SAAs), to achieve simultaneous enhancement of propylene selectivity and propane conversion. We synthesize γ-alumina-supported platinum/copper SAA catalysts by incipient wetness co-impregnation method with a high copper to platinum ratio. Single platinum atoms dispersed on copper nanoparticles dramatically enhance the desorption of surface-bounded propylene and prohibit its further dehydrogenation, resulting in high propylene selectivity (~90%). Unlike previous reported SAA applications at low temperatures (<400 °C), Pt/Cu SAA shows excellent stability of more than 120 h of operation under atmospheric pressure at 520 °C.

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Section: Resultsmentioning

confidence: 99%

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

et al. 2018

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“…Clearly, the catalytic activities of BDACs increase with the reaction temperature rise, but propylene selectivity slightly decreases with elevated reaction temperature. This is caused by the high reaction temperature resulting in secondary and side reactions including hydrogenolysis and cracking . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Bean dregs‐derived hierarchical porous carbons as metal‐free catalysts for efficient dehydrogenation of propane to propylene

Zhang

Wang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: Recently, nanocarbons (e.g. carbon nanotubes, nanodiamond and mesoporous carbon) were found to be efficient catalysts in dehydrogenation reactions. However, the preparation of these nanocarbons is costly, complicated and time-consuming. The goal of this study is to exploit a biomass-derived carbon for propane dehydrogenation. RESULTS: Biomass-derived carbons with hierarchical porous structures and high surface area are prepared via carbonization of bean dregs with NaOH, and operated as metal-free catalysts for direct dehydrogenation of propane to propylene. The properties of the prepared carbon catalysts are characterized by SEM, TEM, XRD, N 2 sorption and XPS techniques, revealing the presence of many nanopores and oxygenated functional groups. The catalytic results show that the resultant carbons exhibit high catalytic activity, selectivity and stability for direct dehydrogenation of propane. The activation temperature can significantly affect the textural properties and surface functional groups of the carbons, and thus, affect their catalytic performance. CONCLUSION: The excellent catalytic performance can be attributed to the high content of oxygenated functional groups combined with hierarchical porous structure and large surface area of the obtained porous carbons which could provide more accessible active sites. This work demonstrates the flexible utilization of bean dregs-derived carbons in propane dehydrogenation to propylene. These authors have made an equal contribution to this work.

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“…PtÀSn bimetallic catalysts have been widely applied in selective oxidation, dehydrogenation, hydrogenation. [9][10][11] A modified one-step co-reduction method [9] was used for the synthesis of highly dispersed and homogeneously distributed PtÀSn/SiO 2 catalysts with different Sn/Pt ratios. Specifically, Pt(acac) 2 and SnCl 2 ·2H 2 O were dissolved in a mixture of 10 mL DMF and 20 mL EG.…”

Section: Ptàsn Alloymentioning

confidence: 99%

“…Bimetallic catalysts have been demonstrated to exhibit better selectivity and activity, as well as stability, for many reactions, as compared to the supported monometallic catalysts. [1][2][3][4][5][6][7][8][9][10][11][12] Among which, Pd-and Pt-based bimetallic catalysts with fine-tuned different ratios have been widely used for various reactions. With addition of the second component, not only the catalytic performance is significantly improved, but also the amount of noble metal used is substantially reduced.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies of bimetallic nanoparticles focus on tuning the size and morphology for improving their catalytic performance. [4,[8][9][10][11][12] In deed, the morphology and surface composition are the most important factors that determined the catalytic performance. However, most industrial catalysts are supported on oxides to improve their efficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Surface Compositions of Oxide Supported Bimetallic Catalysts: A Compared Study by High‐Sensitivity Low Energy Ion Scattering Spectroscopy and X‐Ray Photoemission Spectroscopy

Huang

Zheng

et al. 2019

The Chemical Record

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It is well known that there is a critical relationship between the surface composition and catalytic performance for a bimetallic catalyst. However, in most cases, the surface composition is obviously different from that of the bulk. Moreover, the surface is normally reconstructed under reaction conditions. In this personal account, our recent progresses in determining the surface compositions of oxide supported bimetal catalysts by high‐sensitivity low energy ion scattering spectroscopy (HS‐LEIS) and X‐ray photoemission spectroscopy (XPS) are summarized. Phase diagrams of the surface compositions under various conditions as a function of the bulk composition are established and compared. It is found that oxidation induces de‐alloying and enrichment of PdO, CuO, SnO2 on the surface, while H2 reduction results in re‐alloying. The addition of the second component not only modifies the nature of the active site, but also varies the dispersion of the active components. The support effects are discussed. The compared studies reveal that HS‐LEIS can achieve a more reliable surface composition for oxide supported catalysts.

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Al₂O₃ Nanosheets Rich in Pentacoordinate Al³⁺ Ions Stabilize Pt‐Sn Clusters for Propane Dehydrogenation

Cited by 45 publications

References 31 publications

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

Bean dregs‐derived hierarchical porous carbons as metal‐free catalysts for efficient dehydrogenation of propane to propylene

Surface Compositions of Oxide Supported Bimetallic Catalysts: A Compared Study by High‐Sensitivity Low Energy Ion Scattering Spectroscopy and X‐Ray Photoemission Spectroscopy

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