Publications by authors named "Mingxin Lv"
Article Synopsis
- The study addresses the trade-off between activity and selectivity in acetylene semi-hydrogenation by developing a new Au@PdCu core-shell nanocatalyst that enhances both properties.
- The nanocatalyst achieved 100% acetylene conversion and 92.4% ethylene selectivity at 122 °C, with performance 3.3 times better than a traditional PdCu alloy.
- Advanced techniques like pair distribution function (PDF) and reverse Monte Carlo simulation (RMC) were used to analyze the atomic structure, revealing that low coordination and tensile strain in palladium sites are key for improving catalytic performance.
Article Synopsis
- - Biomass is becoming crucial for renewable energy and sustainable development because it's abundant, renewable, and has a low environmental impact, with 5-hydroxymethylfurfural (HMF) being a key bio-derived product derived from sugar dehydration.
- - HMF is a versatile compound important for making various chemicals like furan-based polymers and biofuels; however, its high reactivity makes it challenging to convert it into specific desired products.
- - The review discusses advancements in catalytic systems for HMF processing and highlights the need for more engineering research to bridge the gap between research and commercial application, as the potential for furan-based chemicals to be more economically viable than petroleum-based products exists.
Article Synopsis
- Accurately determining the 3D atomic structure of active sites on catalysts is crucial for effective design, yet it's a complex task.
- The study combines advanced techniques to analyze the distribution of palladium (Pd) active sites in palladium-copper (PdCu) nanoalloys, resulting in impressive catalytic performance.
- The research reveals that a specific coordination of Pd atoms on the surface greatly enhances the efficiency of semihydrogenation reactions, paving the way for better bimetal catalyst designs.
Article Synopsis
- A new nonlinear holographic technique can process optical information at newly generated frequencies, beneficial for laser displays, security, and image recognition.
- A popular method uses periodically poled lithium niobate (LN) crystals, but traditional methods limit pixel size and field-of-view (FOV) to several micrometers and degrees, respectively.
- This study demonstrates a high-resolution LN hologram with 200 nm pixel size and FOV over 120°, achieving better image quality through techniques like Fourier transform and multiple diffraction orders.
Article Synopsis
- Strong metal-support interaction (SMSI) is important in catalysis, but its origins remain unclear; this study focuses on Pt/CeO as a model catalyst.
- Researchers found that Pt clusters (∼1.6 nm) embed within the ceria lattice at the CeO(110) interface, leading to enhanced electron transfer and the formation of a stabilizing Pt-O-Ce structure, a phenomenon not observed at the CeO(100) support.
- The Pt/CeO(110) catalyst exhibits significantly improved performance in the water-gas shift reaction with a high reaction rate and turnover frequency, along with impressive durability in long-term tests, highlighting the benefits of the embedding structure for catalyst stability.
Article Synopsis
- Understanding nanocatalyst surfaces at the atomic level is critical for improving catalytic reactions and creating better catalysts.
- A study on spherical Pd nanocatalysts revealed high ethylene selectivity of 88% during acetylene conversion, outperforming other shapes and previously reported Pd versions.
- The research combined local structure analysis and simulations to illustrate how surface strain affects ethylene adsorption, providing insights that could enhance the performance of chemical catalysts.
The facile synthesis of yolk-shell-structured nanoparticles (YSNPs) with mobile active metal cores and mesoporous inorganic-organic hybrid silica shells (mHSiO2) is important for their applications. In this work, Pd@mHSiO2 YSNPs have been synthesized in aqueous solution at 95 °C by a one-pot method without the need for extensive purification and separation steps. The method is simple and facile, and ingeniously combines the controlled synthesis of Pd nanocubes, coating of mesoporous silica, and transition from core-shell-structured nanoparticles (CSNPs) to YSNPs.
View Article and Find Full Text PDFA new type of Pd@mSiO composite nanospheres with controlled pore structure, consisting of internal Pd cores and controlled mesoporous silica shells, has been prepared by a facile one-pot method. The thickness and pore size of the shell could be easily tuned by changing the amounts of TEOS and the hydrophobic block length, respectively, during synthesis. In this perspective, the effects of CTAB concentration, pH, and TEOS concentration on the monodisperse sphere morphology of Pd@mSiO nanoparticles (NPs) were investigated.
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