Bimetallic Cu-Pt catalysts over nanoshaped ceria for hydrogen production via methanol decomposition

López-Rodríguez, Luis; Araiza, Daniel G.; Arcos, Diana G.; Gómez-Cortés, Antonio; Díaz, Gabriela

doi:10.1016/j.cattod.2021.07.003

Cited by 18 publications

(8 citation statements)

References 78 publications

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“…Pt-based alloys and intermetallic compounds have been intensively studied because of their potential applications in magnetics, electronics, and particularly in catalysis. − Although effective, Pt is one of the most expensive catalysts. Therefore, adding inexpensive transition metals into Pt can substantially reduce their cost.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

et al. 2023

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We report a synthesis method for highly monodisperse Cu−Pt alloy nanoparticles. Small and large Cu−Pt particles with a Cu/Pt ratio of 1:1 can be obtained through colloidal synthesis at 300 °C. The fresh particles have a Pt-rich surface and a Cu-rich core and can be converted into an intermetallic phase after annealing at 800 °C under H 2 . First, we demonstrated the stability of fresh particles under redox conditions at 400 °C, as the Pt-rich surface prevents substantial oxidation of Cu. Then, a combination of in situ scanning transmission electron microscopy, in situ X-ray absorption spectroscopy, and CO oxidation measurements of the intermetallic CuPt phase before and after redox treatments at 800 °C showed promising activity and stability for CO oxidation. Full oxidation of Cu was prevented after exposure to O 2 at 800 °C. The activity and structure of the particles were only slightly changed after exposure to O 2 at 800 °C and were recovered after re-reduction at 800 °C. Additionally, the intermetallic CuPt phase showed enhanced catalytic properties compared to the fresh particles with a Pt-rich surface or pure Pt particles of the same size. Thus, the incorporation of Pt with Cu does not lead to a rapid deactivation and degradation of the material, as seen with other bimetallic systems. This work provides a synthesis route to control the design of Cu−Pt nanostructures and underlines the promising properties of these alloys (intermetallic and non-intermetallic) for heterogeneous catalysis.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

et al. 2023

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“…It can also be observed from Figure 3c that the value of the real part of the dielectric constant has significantly decreased when Pt nanosheets are inserted between glass and MgSe. The ionic radius of Mg +2 being 62 pm [ 29 ] is smaller than that of Pt +4 (76 pm [ 30 ] ) allowing only interstitial substitution of Pt in voids between ions rather than vacant sites of Mg +2 . It is mentioned that the introduction of large ionic radius in the structure leads to a significant decrease in the value of the dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Optical and Electrical Interactions at the Pt/MgSe Interfaces Designed for 6G Communication Technology

Algarni

Qasrawi

Khusayfan

2022

Cryst. Res. Technol.

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Magnesium selenide thin films are coated onto glass and semitransparent Pt substrates (nanosheets) by the vacuum evaporation technique under a vacuum pressure of 10 −5 mbar. The effect of Pt nanosheets of thicknesses of 100 nm on the structural, compositional, optical, and electrical properties of MgSe is explored. It is found that platinum nanosheets enhance the light absorbability in the visible and infrared ranges of light. They slightly redshift the energy bandgap and decrease the dielectric constant. The strong interaction between Pt and MgSe increases the electrical conductivity by five orders of magnitude. Pt forms shallow impurity levels in the energy bandgap of MgSe allowing the tunneling process at the Pt/MgSe interfaces. Practically, a Pt/MgSe/Pt tunneling type device is fabricated and tested by the microwave impedance spectroscopy technique. It is found that Pt/MgSe/Pt devices can exhibit resonance-antiresonance and negative capacitance effects which are important in electronic circuits as parasitic capacitance cancelers, signal amplifiers, and noise reducers. In addition, evaluation of the cutoff frequency spectra has shown the ability of using the Pt/MgSe/Pt devices as microwave resonators appropriate for 5G/6G technologies. A cutoff frequency larger than 70 GHz can be achieved by imposing ac signal of amplitude of 0.10 V.

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“…37,39,71 However, it is rarely used for transfer hydrogenation due to high energy consumption for in situ hydrogen production and utilization. There are four primary routes for hydrogen production from the traditional thermal catalytic process: methanol steam reforming (MSR), [78][79][80] methanol decomposition (MD), 81,82 partial oxidation of methanol (POM), 83,84 and a combination of oxidative methanol steam reforming (OMSR, MSR, and POM), also known as autothermal reforming of methanol (ATRM). [85][86][87] The main approach for producing hydrogen at present is methanol steam reforming (CH 3 OH + H 2 O → CO 2 + 3H 2 ).…”

Section: Ran Longmentioning

confidence: 99%

Recent progress of heterogeneous catalysts for transfer hydrogenation under the background of carbon neutrality

Chen,

Ma,

Gong

et al. 2024

Nanoscale

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Bimetallic Cu-Pt catalysts over nanoshaped ceria for hydrogen production via methanol decomposition

Cited by 18 publications

References 78 publications

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

Synthesis and Characterization of Stable Cu–Pt Nanoparticles under Reductive and Oxidative Conditions

Enhanced Optical and Electrical Interactions at the Pt/MgSe Interfaces Designed for 6G Communication Technology

Recent progress of heterogeneous catalysts for transfer hydrogenation under the background of carbon neutrality

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