Kinetic and Computational Studies of CO Oxidation and PROX on Cu/CeO2 Nanospheres

Tangpakonsab, Parinya; Genest, Alexander; Yang, Jingxia; Meral, Ali; Zou, Bingjie; Yigit, Nevzat; Schwarz, Sabine; Rupprechter, Günther

doi:10.1007/s11244-023-01848-x

Cited by 4 publications

(1 citation statement)

References 94 publications

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“…Many examples can be found in the literature, but how such defects exactly affect the reaction is still under debate. Catalysts based on Cu and Cu-oxide have been extensively used for many reactions, due to their favorable activity and selectivity, such as in (preferential) CO oxidation − or CO 2 hydrogenation. ,− …”

Section: Introductionmentioning

confidence: 99%

Defect-Rich CuZn Nanoparticles for Model Catalysis Produced by Femtosecond Laser Ablation

Lasemi,

Wicht,

Bernardi

et al. 2024

ACS Appl. Mater. Interfaces

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Femtosecond laser ablation of Cu 0.70 Zn 0.30 targets in ethanol led to the formation of periodic surface nanostructures and crystalline CuZn alloy nanoparticles with defects, low-coordinated surface sites, and, controlled by the applied laser fluence, different sizes and elemental composition. The Cu/Zn ratio of the nanoparticles was determined by energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and selected area electron diffraction. The CuZn nanoparticles were about 2−3 nm in size, and Cu-rich, varying between 70 and 95%. Increasing the laser fluence from 1.6 to 3.2 J cm −2 yielded larger particles, more stacking fault defects, and repeated nanotwinning, as evident from high-resolution transmission electron microscopy, aided by (inverse) fast Fourier transform analysis. This is due to the higher plasma temperature, leading to increased random collisions/diffusion of primary nanoparticles and their incomplete ordering due to immediate solidification typical of ultrashort pulses. The femtosecond lasersynthesized often nanotwinned CuZn nanoparticles were supported on highly oriented pyrolytic graphite and applied for ethylene hydrogenation, demonstrating their promising potential as model catalysts. Nanoparticles produced at 3.2 J cm −2 exhibited lower catalytic activity than those made at 2.7 J cm −2 . Presumably, agglomeration/aggregation of especially 2−3 nm sized nanoparticles, as observed by postreaction analysis, resulted in a decrease in the surface area to volume ratio and thus in the number of lowcoordinated active sites.

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