Catalysis Communications最新文献

The 2,4-dichlorophenoxyacetic acid (2,4-D) is an agrochemical used to remove weeds in paddy fields. Due to the toxicity associated, 2,4-D containing water needs treatment. Thus, herein, a sunlight-responsive ZrO₂-Bi₂O₃ photocatalyst was prepared by green synthesis using cow urine and tested for its efficiency in degrading 2,4-D. The prepared ZrO₂-Bi₂O₃ was then characterized in detail. The experimental results showed that 40% ZrO₂-Bi₂O₃ showed the best photocatalytic activity and stable even after five cycles of reuse. Furthermore, the sustainability of the studied technique that was analysed by the newly developed “weightage-based ranking method” showed that the present work addressed 14 of 17 SDGs.

The present work reports for the first time the use of Decaschistia trilobata Wight. as a reducing agent for synthesis of silver nanoparticles (AgNPs). D. trilobata is an endemic shrub and grows seasonally in dry tropical biome, evergreen forests in hilly terrain of western ghats. One of the most fascinating metallic nanoparticles utilized in biological applications is AgNPs. In present work green synthesis of stable silver nanoparticles using Decaschistia trilobata (Dt-AgNPs) leaves extract as well as quantitative analysis of phytochemicals. The synthesized Dt-AgNPs were characterized and evaluated for their antioxidant anti-inflammatory, antibacterial and dye reduction.

This study assessed the efficacy of ZrO₂-based catalysts with different Mn(II) and Co(II) metal loadings for catalytic degradation of ibuprofen using peroxymonosulfate anion as oxidant. The support was prepared via co-precipitation, and metal ion deposition was achieved through incipient wetness impregnation. Catalysts were characterized by atomic absorption spectrometry, X-ray diffraction, Fourier-Transform infrared spectroscopy, and scanning electronic microscopy. Optimal experimental conditions resulted in complete ibuprofen degradation in 30 min, with 63.3% mineralization. The best-performing catalyst was reusable up to three times. Both sulfate and hydroxyl radicals were generated in the oxidant activation process.

Metal-organic frameworks (MOFs)-based carrier, MIL-100(Fe), was synthesized by hydrothermal method and Ni was supported on the MIL-100(Fe) by wet impregnation method to prepare the catalysts for selective catalytic reduction of NO with C₃H₆ (C₃H₆-SCR). The addition of Ni significantly improved the reactivity of C₃H₆-SCR. At 275 °C, the NO conversion of MIL-100(Fe) was 74.5%, whereas the NO conversion of 5.8%Ni/MIL-100(Fe) with 100% N₂ selectivity was 100%. The in-situ DRIFTS prove that the interaction between NO₂⁻/NO₃⁻ and C_xH_yO_z substances generated intermediate isocyanates (R-NCO), and the reaction pathway was proposed based on the DRIFTS results to understand the mechanism.

We report the recent advances in heterogeneous catalysis with emphasis on electron configurations as driving forces of the catalytic reactions. Several descriptors, including size, shape, surface area, oxygen vacancies, hydrogen spill-over, and porosity have been extensively reported. Whereas most catalysis researchers avoid studying the effect of electronic property due to the difficulty in elucidating its effects in heterogeneously catalyzed reactions. Although this topic is extensively explored in homogeneous systems, there is no unifying paradigm for heterogeneous systems. We focus on the progress made and draw the reader's attention to the possibility that electron manipulation could be used to improve catalysis.

Photocatalytic hydrogen production is recognized as a promising approach to produce greener hydrogen. The development of next-generation photocatalytic materials aims to enhance photocatalysis efficiency. Perovskite, a third-generation photocatalytic material, has gained interest in photocatalytic water splitting due to its optical stability, structural flexibility, bandgap tunability, and charge transfer efficiency. However, the perovskites are not able to achieve the targeted efficiency. Perovskite-based Z-scheme heterojunction photocatalysts can enhance efficiency. This review gives special attention to types and the formation of Z-schemes. In particular, photocatalysts involved in all-solid-state and direct Z-scheme for photocatalytic hydrogen production have been discussed.

MIL-101(Cr) metal-organic frameworks and novel zinc oxide-MIL101(Cr) metal organic frameworks (ZnO-MIL101(Cr)) were prepared by hydrothermal technique at 160 °C and 220 °C for photodegradation of phenanthrene (PHE) in visible light. X-ray diffraction (XRD) analysis indicated a reduction in crystallite sizes of ZnO-MIL101(Cr) when compared to MIL101(Cr). However, incorporation of zinc oxide (ZnO) did not disrupt the MIL101(Cr) structure. ZnO-MIL101(Cr) exhibited high BET surface area (>1000 m²/g) when compared to MIL-101(Cr). These composites have lower bandgaps of ∼3.20 eV, than MIL-101(Cr) (3.5 eV). Optical studies reveal that incorporation of ZnO into MIL101(Cr) delays recombination of electron-hole pairs. These factors lead to ZnO-MIL101(Cr) having similar PHE degradation (98%), however within a shorter time when compared to MIL101(Cr). Catalysts followed the pseudo first-order kinetic model with ZnO-MIL101@220 °C having a rate constant of 2.83 × 10⁻² min⁻¹. This is 2.3× and 1.1× higher than ZnO and the respective MIL101(Cr), correspondingly. Scavenging tests reveal that the hydroxyl radical (•OH) is the primary reactive species for PHE degradation. A degradation mechanism is proposed based on this finding.

Selective conversion of furfural can prepare various important chemicals, marking it as a prominent area of interest in biomass utilization. This paper reviews the latest progress in the direct conversion of furfural or its derivatives to 1, 5-pentanediol, 1, 2-pentanediol and 1, 4-pentanediol which are widely used high-value fine chemicals with great development potential in application. The recent catalytic methodologies employed in the synthesis of pentanediols from furfural and its derivatives, encompassing both noble metal and non-noble metal catalysts, have been comprehensively summarized. Furthermore, the challenges and opportunities in biomass-based pentanediols synthesis are analyzed, emphasizing catalyst importance and sustainable, eco-friendly production for pentanediols from renewable resources.

We demonstrated that [Bmim]Br can act as an efficient catalyst exhibiting excellent selectivity in the aerobic oxidation of cumene by decreasing the amount of ILs. The optimal CHP selectivity of 95.4% with 23.6% conversion was obtained from cumene catalyzed by [Bmim]Br at optimal conditions. The kinetic study showed that the reaction follows 1.2-order kinetics. The mechanism study indicated that [Bmim]Br could accelerate the initiation step, transforming the cumene to cumyl radical(R•). The positive effect of hydrogen of imidazolium on the reaction has been observed in the aerobic oxidation of the cumene.

The first manganese catalyzed tandem methodology for the synthesis of 2-aminobenzothiazoles from 2-bromophenyl isothiocyanate and differently substituted amines has been demonstrated. This protocol employs environmentally benign, cost-effective and readily available MnCl₂.4H₂O as the catalyst under air. The present strategy exhibits wide substrate scope and affords differently substituted 2-aminobenzothiazoles in moderate to good yields.