Catalysis Communications最新文献

In the present study, siliceous self-pillared pentasil (SPP) zeolite with regular mesopores was synthesized and used as a support for anchoring bimetallic PdAg clusters through a facile impregnation-reduction method. The as-prepared PdAg/SPP catalysts with different Pd/Ag ratios were demonstrated to catalyze formic acid dehydrogenation for hydrogen production. XRD results confirmed the formation of PdAg alloy on the surface of SPP zeolite. The Pd₇Ag₃/SPP catalyst showed high activity at 80 °C with an initial turn-over frequency (TOF) of 1263.6 h⁻¹, proving the strategy using hierarchical SPP zeolite as carrier is advantageous over bulky zeolites for making highly active formic acid dehydrogenation catalysts.

This study presents a straightforward chemical approach to induce cationic surface defects on SrCoO_3-δ (SCO) perovskites by selectively etching a-site Sr elements on the surface. The modified SCO-30 catalyst from this method exhibits an optimized thickness of cobalt-rich amorphous layer enriched with oxygen vacancies. This modification enhances the trifunctional catalytic activity for oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) in an alkaline electrolyte. Importantly, the perovskite's structure remains unchanged during the surface engineering process. These findings underscore cationic defect engineering as an effective strategy for the rational design of high-performance electrocatalysts, showcasing potential applications in diverse electrochemical processes.

This study introduces a novel green synthesis method using Hyphaene Thebaica fruit extracts to produce WO₃ nanoflakes. The synthesized material exhibits remarkable visible light photocatalytic efficiency in degrading Methylene Blue (MB) and Congo Red (CR) pollutants. With removal efficiencies exceeding 98% for MB and 93% for CR within short durations, the WO₃ nanoflakes show promise for water treatment. Trapping experiments suggest that hydroxyl radicals, hydrogen peroxide, and holes are the primary reactive species involved in the photodegradation process. Additionally, the recyclability study demonstrates the stability and reusability of WO₃ nanoflakes, further highlighting their potential for practical applications in wastewater treatment.

It is critical to enhance the photocatalytic performance of BiOBr through appropriate strategies. Two BiOBr samples with different water (W) and ethylene glycol (EG) solvents have been synthesized. BiOBr-EG presents a 3D nest-like morphology composed of nanoplates, prominently emphasizing (110) facets. In contrast, BiOBr-W displays 2D microplates with exposed (102) facets. Notably, BiOBr-EG exhibits a degradation rate 7.4 times faster and removal efficiency of Enrofloxacin (ENR) 2.2 times greater than that of BiOBr-W. Additional investigations reveal that ·O₂⁻ plays a dominant role in the degradation process. Finally, the degradation pathways are explored through DFT calculation and HPLC-MS methods.

1,4-cyclohexanedimethanol (CHDM) is used as a high-value polyester monomer. On the basis of the catalysts of RuSn and Pd, the compound catalysts of RuSn and PdCe are prepared by adding the additive Ce to the Pd-based catalyst. The results showed that the yield of CHDM increased by 13.4% after the addition of Ce, indicating that Ce is conducive to the activation of HH and CO thus promoting the hydrogenation of carboxyl groups. Furthermore, the addition of Ce effectively slows down the coverage of the compound on the active component Pd, prolonging the lifespan of the catalyst.

In this study, La-doped ZrO₂/g-C₃N₄ nanocomposites were synthesized and remarkably, 0.8% La-doped ZrO₂/g-C₃N₄ exhibited an outstanding degradation efficiency of 87% (k = 11.301 × 10⁻³ min⁻¹). The enhanced photocatalytic performance is due to the synergistic effects of lanthanum and g-C₃N₄, which promote charge separation and increase the number of active sites. A built-in electric field exists according to the charge density difference and electrostatic potential results. At 300 K, the nanocomposite is thermally, energetically, and dynamically stable. Our results provide valuable insights into the design and development of efficient photocatalysts for the removal of organic contaminants from aqueous environments.

Molybdenum phosphide (MoP) has attracted increasing attention as a novel catalytic material for CO₂ reforming of methane in virtue of superior coke resistance, but its catalytic reactivity is still relatively low. This work for the first time improved the reforming activity of MoP via ZrO₂ modification. The Zr_0.01MoP catalyst with Zr/Mo molar ratio of 0.01 possessed much higher activity than bare MoP at 800–900 °C. Structural characterizations revealed that the introduction of ZrO₂ would decrease the particle size, modify the electronic structure and change the reducibility property of MoP, which may function together to deliver the higher activity.

This review paper presents a concise summary selected plasma-assisted catalyst preparation and pre-treatment methods. It provide classification of reported plasma techniques used for catalyst preparation and give examples for their applications. The paper also discusses the advantages and disadvantages of plasma-assisted methods for the synthesis of catalytic materials. The challenges associated with the use of plasma in the preparation of catalytic materials are also presented. The opportunities for the application of plasma in the preparation of catalysis for generation of advanced materials and improving industrial processes are also highlighted.

The Cu-CuO-ZnO composite catalyst synthesized through the formic acid-assisted method, underwent thorough characterization via XRD, N₂ physisorption, TPR, TPD, TGA, XPS, and TEM. When applied to the selective dehydrogenation of 1,4-butanediol, this catalyst outperformed counterparts prepared through co-precipitation and impregnation methods. The superiority is attributed to the formic acid-assisted method yielding smaller Cu nanoparticles and some CuO species, undergoing in-situ reduction by dehydrogenation-generated H₂. This process results in nascent Cu nanoparticles, enhancing catalytic performance. Notably, the catalyst demonstrated remarkable stability over a 100 h time-on-stream without discrepancies, highlighting the robustness of the formic acid-assisted method for 1,4-butanediol dehydrogenation.

Catalytic ozonation has become one of the most promising technologies for wastewater treatment due to its high efficiency in the removal of organic pollutants. Three carbon materials (carbon nanotubes, graphene oxide and activated carbon) and five pharmaceutical compounds were selected for this study. All tested parent pollutants were easily degraded by single ozonation. In terms of mineralization, the presence of catalyst revealed to be necessary to enhance organic matter removal, and activated carbon (GAC) showing superior performance. To evaluate the effect of the water matrix, experiments were performed with ground water and wastewater and significant degradation of pollutants was achieved.