Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene

Hu, Mingzhen; Liu, Jin; Dang, Yanliu; Suib, Steven L.; He, Jie; Liu, Ben

doi:10.3389/fchem.2020.581512

Cited by 12 publications

(21 citation statements)

References 59 publications

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“…When TiO 2 -N was used as the support, a clear shift from 2029 to 2017 cm −1 can be seen for the linear bound CO mode. 51,52 Similar results on the DRIFTS spectra of adsorbed CO were observed on Pt and Cu NPs (Figure S10). These results indicate that the metallic NPs become more negatively charged in the presence of surface amines; as such, the binding of electrophilic CO 2 is presumable favorable on metal NPs.…”

Section: Resultssupporting

confidence: 77%

Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Liu

Shaaban

Bamonte

et al. 2021

ACS Appl. Mater. Interfaces

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Photocatalytic reduction of CO2 to valuable chemical fuels is of broad interest, given its potential to activate stable greenhouse CO2 using renewable energy input. We report how to choose the right metal cocatalysts in combination with the surface basicity of TiO2 to enhance their photocatalytic efficiency for CO2 photoreduction. Uniform ligand-free metal nanoparticles (NPs) of Ag, Cu, Au, Pd, and Pt, supported on TiO2, are active for CO2 photoreduction using water as an electron donor. The group XI metals show a high selectivity to CO and Ag/TiO2 is most active to produce CO at a rate of 5.2 μmol g–1 h–1. The group X metals, e.g., Pd and Pt, mainly generate hydrocarbons including methane and ethane, and Pd/TiO2 is slightly more active in methane production at a rate of 2.4 μmol g–1 h–1. The activity of these photocatalysts can be enhanced by varying the surface basicity of TiO2 with primary amines. However, proton reduction selectivity is greatly enhanced in the presence of amine except amine-modified Ag/TiO2, which shows an activity enhancement by 2.4 times solely for CO2 photoreduction as compared to that without amines without switching its selectivity to proton reduction. Using in situ infrared spectroscopy and CO stripping voltammetry, we demonstrate that the improvement of electron density and the low proton affinity of metal cocatalysts are of key importance in CO2 photoreduction. As a systematic study, our results provide a guideline on the right choice of metals in combination of the surface functionality to tune the photocatalytic efficiency of supported metal NPs on TiO2 for selective CO2 photoreduction.

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Section: Resultssupporting

confidence: 77%

Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Liu

Shaaban

Bamonte

et al. 2021

ACS Appl. Mater. Interfaces

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“…It is generally accepted that palladium catalysts are mostly used to achieve a high catalytic performance for this reaction. Yet, it is difficult to design platinum-based catalysts that have good catalytic performance due to their low selectivity and poor stability. , The biggest problem is that the overhydrogenation of phenylacetylene to phenylethane often occurs in the platinum catalyst due to the weak cooperation of the active sites and the support environment, thus resulting in the catalytic hydrogenation of styrene that cannot be effectively avoided. − …”

Section: Introductionmentioning

confidence: 99%

Promotion Effect of the X-Zeolite Host on Encapsulated Platinum Clusters for Selective Hydrogenation of Phenylacetylene to Styrene

et al. 2021

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The microenvironment surrounding the metal clusters on a carrier produces a tremendous influence on its catalytic performance. In this work, the promotion effect of the zeolitic inner host on catalytic performance of encapsulated platinum nanoclusters is reported. In the reaction of phenylacetylene semihydrogenation to styrene, Pt@X-zeolite, where platinum nanoclusters are encapsulated into the inner microporosity of the X-zeolite, exhibits an ∼3.37 times increased turnover frequency and a much better selectivity of 87.6% in comparison to the referenced Pt/Xzeolite of 79.3% selectivity to styrene at the same reaction conditions, in which the platinum nanoclusters are located at the exterior of the zeolite. Meanwhile, the Pt@X-zeolite displays a higher stability after 10 cycles of the reaction. Through the detailed characteristics, the excellent performance of Pt@X-zeolite is mainly due to the promotion of the zeolitic framework on the encapsulated Pt clusters, resulting in "electron-deficient" Pt clusters, leading to a stronger interaction with the π* molecular orbitals of phenylacetylene and thus enhancing the activation and conversion of phenylacetylene. The zeolite cavity wrapped with encapsulated Pt clusters regulates the adsorption trend of phenylacetylene through the acetylene group on it, promotes the desorption of styrene, and strengthens its selectivity. Meanwhile, Pt@X-zeolite has an excellent stability through the zeolite framework, which protects the Pt species from being lost. This investigation reveals the importance of the zeolitic microenvironment on the catalytic performance of encapsulated metal species and deepens the cognition for this type of catalyst.

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“…As a result, selective hydrogenation of alkynes is generally conducted at low alkyne conversions to generate enhanced yields of alkenes. In previous work 23 it was shown that the supported ultra-small Pt nanoparticles on mesoporous TiO 2 significantly improved catalytic characteristics in the selective hydrogenation of phenylacetylene to styrene. The selectivity of styrene was above 80% in a wide range of phenylacetylene conversion (20-75%) for 10-25 h of reaction at 50 °C and 0.4 MPa H 2 .…”

Section: Introductionmentioning

confidence: 99%

Influence of the electronic state of the metals in Cu–Pt/SiO₂ catalysts on the catalytic properties in selective hydrogenation of the C≡C bond

Shesterkina

Shuvalova

Strekalova

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The development of highly efficient and selective bimetallic catalytic systems for the hydrogenation of unsaturated compounds is an important scientific task. RESULTS: A new bimetallic 1%Cu-1%Pt/SiO 2 catalyst for the selective hydrogenation of phenylacetylene was developed. The bimetallic catalysts were prepared by a consecutive incipient wetness impregnation method and a redox method with preadsorbed hydrogen. We showed that the catalytic properties of 1%Cu-1%Pt/SiO 2 catalysts and selectivity toward styrene depend on the states of metals and interactions between Cu and Pt in bimetallic particles. The strong contact interaction between Pt 0 , Pt ⊐and Cu <2+ in sample prepared by the impregnation method provides a high selectivity of about 82% in styrene formation, while the interaction between PtO and CuO phases provides a 60% selectivity under mild conditions. CONCLUSIONS: A new highly effective bimetallic Cu-Pt/SiO 2 catalyst was found for the selective hydrogenation of phenylacetylene with the formation of styrene.

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Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene

Cited by 12 publications

References 59 publications

Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Promotion Effect of the X-Zeolite Host on Encapsulated Platinum Clusters for Selective Hydrogenation of Phenylacetylene to Styrene

Influence of the electronic state of the metals in Cu–Pt/SiO₂ catalysts on the catalytic properties in selective hydrogenation of the C≡C bond

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Supported Pt Nanoparticles on Mesoporous Titania for Selective Hydrogenation of Phenylacetylene

Cited by 12 publications

References 59 publications

Surface Basicity of Metal@TiO2 to Enhance Photocatalytic Efficiency for CO2 Reduction

Surface Basicity of Metal@TiO2 to Enhance Photocatalytic Efficiency for CO2 Reduction

Promotion Effect of the X-Zeolite Host on Encapsulated Platinum Clusters for Selective Hydrogenation of Phenylacetylene to Styrene

Influence of the electronic state of the metals in Cu–Pt/SiO2 catalysts on the catalytic properties in selective hydrogenation of the C≡C bond

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Product

Resources

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Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Surface Basicity of Metal@TiO₂ to Enhance Photocatalytic Efficiency for CO₂ Reduction

Influence of the electronic state of the metals in Cu–Pt/SiO₂ catalysts on the catalytic properties in selective hydrogenation of the C≡C bond