Catalysis Communications最新文献

The unique ability of Cu⁺ to enhance C-C coupling makes it important in the field of CO₂ reduction reaction (CO₂RR) over Cu-based catalyst, while Cu⁺ is very prone to deactivation. Hereby, we propose a simple and feasible stabilization strategy to stabilize Cu⁺ species through reducing Cu-Mg-Al hydrotalcite by adding ascorbic acid, which owns stable product selectivity in a span of 6 h at −0.95 V vs.RHE. Characterization results show that the excellent stability is promoted by the heterostructure of Cu₂O and hydrotalcite with retained Cu⁺ species, which derives from Cu₂O and slow down the rapid reduction of Cu⁺ to Cu⁰.

In this study, we investigated the non-free radical pathways and active sites of N-doped graphene (N-rGO)-activated peroxymonosulfate (PMS). All as-prepared N-rGO samples could activate PMS and develop non-radical pathways. Graphitic-N sites were the major sites for N-rGO activation of PMS, and their content was positively related to the intensity of non-radical pathways. For sulfamethoxazole (SMX), the degradation rate by NH₃-rGO-10/PMS and non-radicals within 10 min was 93.66 and 75.34% respectively. In the presence of different anions and different concentrations of humic acid, the removal rate of SMX was still more than 90%.

The increasing focus on sustainability has prompted researchers to investigate innovative catalytic methods for converting acids produced from biomass into value added ester compounds. The present study focuses on the efficient conversion of diverse biomass-derived acids into esters through the utilization of zeolite-based catalysts, capitalizing on their unique structural and acidic properties. The utilization of esters encompasses a wide range of applications, making them highly versatile as both platform chemicals and biofuels. Recent development and enhancement of catalytic systems based on zeolites are specifically reviewed for the efficient synthesis of ester compounds with significant commercial value from biomass derived acids.

The study present the synthesis and applications of AgCl@Pd/Au/Ag trimetallic nanoparticles (NPs). The NPs are synthesized using BTI urine that facilitate their formation. The paper explores the crystalline structure and morphology of the NPs. In terms of applications, the NPs show superior catalytic activity in the reduction of compounds and enhanced degradation of dyes. They also exhibit antimicrobial properties against bacteria and antioxidant potential. The synthesis technique is environmentally friendly and economically efficient. The NPs have a high recyclability rate and can be produced in large quantities. Overall, the AgCl@Pd/Au/Ag trimetallic NPs have promising multifaceted applications.

Hemicellulose hydrolysate upgrading was performed over BEA zeolites containing Si/Al equal to 12 and 19. A model hydrolysate was prepared considering typical concentrations of xylose, arabinose, furfural and acetic acid representative of hemicellulose hydrolysate from Brazilian sugarcane bagasse. BEA zeolite showed to be an effective catalyst to promote the hydrolysate upgrade into platform molecules. Acetic acid participated in the reaction as a homogeneous Brønsted co-catalyst but BEA zeolite plays a decisive role as it strongly affects products distribution. Pentoses with different molecular configurations produced different products due to hydroxyls steric positions. The presence of acetic acid did not damage the catalyst.

The 2D transition metal WSe₂, a strong photocatalyst, was combined with BiVO₄ to create a p-n heterojunction photocatalyst using a hydrothermal process. The resulting 10% WSe₂/BiVO₄ (in the synthesized material, the mass ratio of WSe₂ to BiVO₄ is 1:10) composite showed impressive 94.5% efficiency in Methylene Blue (MB) degradation under visible light. Even after eight cycles, it maintained a 72% degradation rate, demonstrating robust photocatalytic stability. Experiments, including ·O²⁻ and h⁺ capture and ESR analysis, revealed their vital roles in photocatalytic degradation. The exceptional performance of WSe₂/BiVO₄ is attributed to the internal electric field formed between WSe₂ and BiVO₄, enhancing carrier mobility.

Photocatalysts based on the anodic single-walled titania nanotubes modified with metal nanoparticles (Au, Pd, Pt) were prepared and investigated. The metal nanoparticles sizes are in a range from 3 to 15 nm. The wall thickness of the nanotubes varied from 14 to 17 nm. It is established that photocatalysts with Au, Pd, Pt produce acetaldehyde during complete ethanol decomposition reaction. Additionally the formation of methane occurs in the TiO₂ nanotubes with Pd and Au nanoparticles. We obtained firstly the multifunctional TiO₂ nanotubes modified with Pd and Au nanoparticles for use both in air purification and in the production of hydrocarbon fuel precursors.

CoFe₂O₄-PES photocatalytic membranes were assessed for Naproxen degradation in water. The degradation obeyed first-order reaction kinetics (K_app: 1.25 × 10⁻³ min⁻¹ - 3.90 × 10⁻³ min⁻¹). Surface roughness altered the collision dynamics of reactive species. It enhanced the chances of successful collision between Naproxen and reactive radicals. Membrane hydrophilicity improved the generation of reactive radicals by minimizing the blockage of active sites. Intermediates detected by Quadrupole Time-of-Flight Mass Spectrometry showed that Naproxen degraded via demethylation, hydroxylation, and ring-opening reactions. Leaching studies investigated the stability of the prepared membranes. CoFe₂O₄-PES membranes can be used in advanced oxidation technologies for water treatment.

This work investigates the impact of immobilization supports on the performance of Pd nanocatalysts in light-induced Suzuki coupling reactions by utilizing two model supports, mesoporous silica (SBA-15) and covalent triazine framework (CTF-Ph). Despite comparable Pd loading (0.3–0.5 wt%) and chemical states, under visible light illumination, Pd/CTF-Ph demonstrated a remarkable 40% reduction in activation energy, outperforming the 16% decrease observed with Pd/SBA-15. This superior performance is attributed to the light-absorbing properties of CTF-Ph and its facilitated pi-pi interaction toward reagents on the catalyst surface. Our findings offer valuable insights into the development of effective catalysts for light-assisted CC bond formation reactions.

Photocatalysis emerged as a promising alternative to address fossil fuel scarcity and the limitations of other clean energy sources. Photocatalysis enables hydrogen production via water splitting, using photocatalysts and light irradiation, which can be stored and utilized across various applications. Photocatalysis has exhibited significant improvements and promising yields in hydrogen production, surpassing its initial stages. The current photocatalyst market offers diverse materials with unique characteristics, and continuous evolution is observed in their synthesis methods. This contribution aims to compile recent literature on advancements in photocatalysts for hydrogen production, with particular emphasis on photocatalyst type, hydrogen production performance and market trends.