Catalysis Communications最新文献

In this study, we have described a novel reaction between 1,4-enynyl-3-ols and alkyl bromides. The reaction was carried out in the presence of Ag₂O, following a free radical 1,2-alkynyl migration pathway, which was confirmed through control experiments. This methodology offers several advantages, including high efficiency and a wide range of applicable substrates.

Various Ni supported on active carbon (Ni/AC) catalysts were acquired by reduced at different temperatures, among which Ni/AC-500 possesses the smallest particle sizes of metallic Ni species, favoring to more active sites exposed on the catalyst surface, and the suitable content of metallic Ni⁰, implying the high hydrogenolysis activity obtained. Additionally, the highest mesoporous volume of Ni/AC-500 promotes the diffusion of large molecules from lignin depolymerization. Therefore, Ni/AC-500 exhibits the higher lignin conversion and yields of liquid bio-oil and monomers, but the lower yield of bio-char in lignin hydrodepolymerization due to its higher hydrogenolysis activity compared with other catalysts.

The electrochemical CO₂ reduction reaction (CER) to methane (CH₄) has received great attention. Here, we proposed an efficient method to facilitate the conversion of CO₂-to-CH₄ by creating a two-phase interface over urea-modified La₂CuO₄ catalyst. The most optimized one exhibits the highest selectivity (22%) for CH₄ and the best activity (14 mA cm⁻²) and stability (5 h) at the potential of −1 V vs. reversible hydrogen electrode. The enhanced CER performance can be attributed to the establishment of interfacial effect within the two-phase, which facilitates the reduction of Cu²⁺ and promotes the active sites concentration.

The catalyst intrinsic area-specific activity for the oxygen reduction reaction (ORR) was constrained by the scaling relations governing the adsorption of reaction intermediates. In this study, we strategically modified the electronic band structures of Pt(CuNi)_x alloy nanoparticles by varying their composition, resulting in a specific activity trend resembling a volcano shape. The introduction of MoO_y shattered the existing scaling relations, leading to a significant enhancement in ORR activity of Pt alloys, surpassing the activity of Pt(CuNi)_x catalysts. These findings proved the effectiveness of MoO_y deposition on Pt(CuNi)_x in disrupting the scaling relations, ultimately improving ORR activity.

This work describes a simple method for the preparation of 5-hydroxymethylfurfural (HMF) by dehydrating fructose in DMSO, either with the use of an affordable catalyst or in a catalyst-free manner. This process can be accompanied, under harsh conditions, by the bromide-catalyzed Kornblum oxidation of the hydroxyl group by the solvent, resulting in the formation of 2,5-diformylfuran (DFF). The optimized techniques presented in this study can serve as a foundation for the production of valuable biobased furanic platform chemicals from renewable sources in any laboratory, stimulating the development of sustainable chemistry and research in related fields worldwide.

5-6 nm hydrophilic Ni_xCo_(1-x) NPs was synthesized by a cost-effective and scalable method and was coated onto conductive substrates without any binders or additives thanks to its small particle effect and possiblely magnetic effects. Then, the Ni_xCo_(1-x) NPs can be transformed into Ni_xCo_(1-x)(OH)₂ by an OER-activating strategy. Optimized by the composition effect, the Ni_0.8Co_0.2/CF exhibits best activity for supercapacitors (2124F/g). Underling mechanism of the OER evolution process well studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrometry, X-ray absorption near-edge spectra (XANES). Density functional theory (DFT) calculations was performed and verify the synergistic effect of nickel and cobalt and the support effect.

The Cu-doped mesoporous silica-based particles (Cu-BMS) were prepared using an evaporation-induced self-assembly sol-gel procedure as a heterogeneous catalyst for the activation of peroxydisulfate (PDS). The formation of well-organized mesoporous structures with amorphous nature and high surface area of 286 m²/g was demonstrated. The catalytic activity of Cu-BMS in the degradation of Methylene Blue (MB) and the effects of operating parameters, including Cu-BMS dosage, initial PDS amount, initial MB concentration, temperature and initial pH, were investigated in details. The Cu-BMS demonstrated a remarkable catalytic activity (93.5% degradation efficiency within 60 min) and good stability.

The low charge separation and transfer of g-C₃N₄ hinders its industrial application in photocatalytic hydrogen evolution. Here, we design a novel co-catalyst strategy to integrate Ag₂Se nanoparticles in situ on the surface of g-C₃N₄. The optimized photocatalyst, 15% Ag₂Se/g-C₃N₄, demonstrates remarkable photocatalytic efficiency in the hydrogen evolution rate, reaching to 1102.8 μmol·g⁻¹·h⁻¹, 7 times higher than g-C₃N₄. To further elucidate the photocatalytic activity of 15% Ag₂Se/g-C₃N₄, we present a possible mechanism based on various characterizations and density functional theory calculations. This research offers potential insights for the future development of silver chalcogenide composites in photocatalysis.

The manuscript covers Vanadium Pentoxide Gas Sensors: Elemental Doping Strategies and Sensing Performance Impact. In this paper, we discuss elemental doping ways to improve gas sensing performance in V₂O₅ sensors. The sensing characteristics of V₂O₅ are influenced by dopants such as transition metals, rare earth elements, and non-metals. We investigate the processes behind doping-induced enhancements in sensitivity, selectivity, response time, and stability. Additionally, we explore elemental doping issues and constraints, such as precise process control, crystal structural alterations, and dopant concentration implications on sensing characteristics. This study demonstrates the possibility of elemental doping for modifying gas detecting capabilities in V₂O₅ sensors for various applications.