Catalysis Communications最新文献

The study explored the simultaneous use of peroxydisulfate (PS) and hydrogen peroxide (H₂O₂) in the electrocoagulation process for efficient removal of direct red 89 (DR89) from aqueous solutions. The study examined the effect of various parameters, including electrode type, electrolyte type and dosage, initial pH, current density, PS and H₂O₂ dosage, and initial DR89 concentration. The highest efficiency was achieved in acidic conditions using AL-Fe electrodes and Na₂SO₄ as a supporting electrolyte and applying the highest studied current density (20 mA/cm²). The study found that DR89 removal followed second-order reaction kinetics, and singlet oxygen played a significant role in DR89 degradation.

A study has synthesized a composite of carbonaceous nanomaterials, including functionalized multi-walled carbon nanotubes (f-MWCNT) and reduced graphene oxide (rGO), with 1D-architectured zinc oxide nanorods (ZnO NRs), for applications in adsorption and sunlight-assisted photocatalytic degradation. We modified the composite with 1% w/w rGO and f-MWCNT. We studied the adsorption and photodegradation of azo dyes using ZnO and its nanocomposites. The photocatalysts of RZnO and CZnO nanocomposite degraded RhB, MB, CV, MO, and CR dyes with a degradation percentage of 92 to 97%. The nanocomposite demonstrated superior antimicrobial and antioxidant properties compared to ZnO NRs, highlighting their potential in drug delivery.

This article reviews recent studies about various generations of the carbon materials for their applications in energy and environmental remediation. The synthesis routes of the carbon materials including the condition parameters, interaction of precursors, dopants and carbon materials, as well as their physical/chemical properties are explicated first. Then, the application and mechanism of metal-free/metal-doped/non-metal-doped carbon materials are discussed in detail. Lastly, this review is ended with a summary and invigorating perspectives on the challenges and future directions at the forefront of the catalysis platform to take a step further for real application.

Constructing a heterojunction is an effective strategy to achieve high-efficiency separation of charges, which enhances the photocatalytic performance. Here, we present a 0D/3D S-scheme heterojunction, BiOBr/Bi₇O₉I₃, which was constructed by incorporating highly dispersed BiOBr quantum dots (QDs) onto the surface of Bi₇O₉I₃ nanoflowers. This heterostructure effectively absorbs visible light and enhances the separation of charge carriers significantly via an S-scheme pathway. As a result, the BiOBr/Bi₇O₉I₃ photocatalysts demonstrated an excellent photocatalytic O₂ evolution rate, achieving a rate of nearly 1500 μmol h⁻¹ g⁻¹. This work highlights the effectiveness of constructing S-scheme heterojunctions to enhance photocatalytic O₂ evolution.

Photocatalytic hydrogen generation is a viable option among strategies to mitigate the energy crisis. This study investigates visible-light-driven H₂ generation using Ag-doped twin crystal Cd_xZn_1-xS photocatalysts synthesized through a solvothermal process. Ag nanoparticles induce Surface Plasmon Resonance (SPR), enhancing photo-response. Twin crystal 1 wt% Ag-doped Cd_0.5Zn_0.5S photocatalyst exhibits significant H₂ evolution at 2458 μmol/g_cat.h under visible light. Enhanced performance is attributed to dual-function Ag nanoparticles: SPR-enhanced light absorption, efficient electron transfer to the Cd_0.5Zn_0.5S conduction band, and the twin crystal structure facilitating electron-hole pair separation. Emphasis on optimal Ag loading and the crucial role of SPR in elevating photocatalyst efficiency.

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 current study explores the hydrodeoxygenation (HDO) of pine sawdust derived pyrolysis bio-oil and co-processing of raw bio-oil with Vacuum Gas Oil (VGO) in a micro-activity testing (MAT) unit. The catalytic performance of mono- and bi-metallic catalysts were tested for bio-oil upgrading. Notably, FeCo (2:1)/Al₂O₃ catalysts exhibited superior HDO activity compared to their mono-metallic counterparts. Co-processing of raw bio-oil (2–10 wt%) with VGO led to a notable increase in gasoline yield of ∼48% with a 6 wt% blend. Maximum conversion was achieved with 8 wt% blend, further increasing the proportion, conversion decreased significantly affecting the product distribution.

We developed a nanostructured catalyst consisting of WO₃ nanoparticles and Nb₂O₅ nanorods for efficient glycerol acetalization to produce a fuel additive (solketal) at room temperature. Particularly, the WO₃/Nb₂O₅ nanocatalyst calcined at 400 °C (WO₃/Nb₂O₅–4) contains W⁵⁺ species and optimum acid sites, which enhanced glycerol conversion (92.3%) with 95.6% of solketal selectivity at room temperature. The structure stability of the WO₃/Nb₂O₅–4 catalyst during the reaction is showcased by hot-filtration study and XRD/XPS characterization. However, the inadequate regeneration of the Brønsted acid sites led to a gradual decrease in the recyclable activity of the WO₃/Nb₂O₅–4 catalyst.

A series of YCe catalysts were prepared using Y-loaded (Y = Cu, Co, Mn) Ce-based metal–organic framework as a precursor. Mn-loaded CeO₂ exhibited significantly better catalytic activity in the catalytic oxidation of ethyl acetate (EA) than noble metal catalyst. The relationship between the physicochemical properties of YCe catalysts and catalytic activity was studied by different characterization methods. The enhanced catalytic activity was attributed to the strong interaction between the transition metals and Ce, high specific surface area, abundant lattice defects, more oxygen vacacies and higher O_latt/(O_latt + O_ads + O_w) molar ratios. The main intermediates in the oxidation of EA were ethanol, acetic acid, acetone, acetaldehyde and diethyl ether.

Synergistic integration based on some transition-metal (TM) derived compounds is a unique and appealing technique, especially toward oxygen evolution reaction (OER) under alkaline circumstances. Herein, we present a cobalt-selenide (CoSe₂) and cobalt-oxide (Co₃O₄) based composite (CSCO-2) material through a wet chemical method. As-prepared catalyst has been analyzed for various physicochemical characterizations. CSCO-2 offers efficient OER performance in 1.0 M KOH with an overpotential of 252 mV at current density of 20 mA/cm², with a low Tafel slope value of 69 mV/dec. Importantly, as-prepared catalyst shows stability of 48 h for longer electrochemical performance as a potential candidate for OER.