Catalysis Today最新文献

{"title":"Photoelectrochemical generation of H2O2 using hematite (α-Fe2O3) and gas diffusion electrode (GDE)","authors":"T. Imrich ,&nbsp;T. Nakata ,&nbsp;T. Ohno ,&nbsp;J. Krýsa","doi":"10.1016/j.cattod.2025.115206","DOIUrl":"10.1016/j.cattod.2025.115206","url":null,"abstract":"<div><div>In contrast to the industrial-scale production of H₂O₂, electrochemical or photoelectrochemical synthesis is an environmentally friendly alternative. In this study, the photoelectrochemical generation of H₂O₂ was investigated using a hematite (α-Fe₂O₃/FTO/glass) photoanode in combination with a gas diffusion electrode (GDE) modified by the incorporation of tin(II) phthalocyanine (SnPc) in its hydrophilic layer. The experiments were conducted in a photoelectrochemical cell with two compartments separated by a proton exchange membrane, under an applied bias and AM1.5 irradiation (100 mW/cm²). The amount of H₂O₂ generated was quantified through chemical analysis using visible light spectrophotometry of the electrolyte. To assess the process efficiency, the Faradaic efficiency (<em>FE</em>) was calculated. The optimal configuration employed air as the inlet gas for the GDE and phosphate buffer (pH 6.4) as the electrolyte in the cathodic compartment. The combination of the hematite photoanode and the GDE modified with SnPc was the most effective for H₂O₂ photoelectrochemical generation. The highest <em>FE</em> values achieved were 52.4 % for the GDE (O₂ reduction to H₂O₂) and 0.4 % for the hematite photoanode (H₂O oxidation to H₂O₂).</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"450 ","pages":"Article 115206"},"PeriodicalIF":5.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Ce:Ti ratio and cerium salts on the properties of mesoporous Ti-Ce oxides and their photocatalytic activity","authors":"Peter Nadrah ,&nbsp;Mateja Knap ,&nbsp;Tatiparthi Vikram Sagar ,&nbsp;Andrijana Sever Škapin ,&nbsp;Urška Lavrenčič Štangar","doi":"10.1016/j.cattod.2025.115204","DOIUrl":"10.1016/j.cattod.2025.115204","url":null,"abstract":"<div><div>To investigate the influence of different CeO₂ precursors and Ce:Ti ratios, we have synthesised 8 mesoporous Ti-Ce oxides via the evaporation-induced self-assembly (EISA) method with Ce:Ti ratios between 0.2 and 20 mol%. The materials exhibited type IV isotherms and a specific surface area of 140–180 m²·g⁻¹ with pore diameters in range of 3–20 nm. The crystalline phases of materials comprised predominantly anatase with a significant decrease in overall crystalline content with increasing Ce:Ti ratio. Materials with higher Ce:Ti ratio showed an increased light absorption in the visible region. Although crystalline CeO₂ was not detected, the presence of Ce(IV) was confirmed by X-ray photoelectron spectroscopy. For the photocatalytic experiments, we compared these materials with the TiO₂-CeO₂ composites of our previously published syntheses to yield 16 samples synthesized via three synthesis approaches: (1) concurrent synthesis from titanium alkoxide and cerium salts in one pot, (2) synthesis of TiO₂ in the presence of previously-synthesised CeO₂ and (3) physical mixing of separately-synthesised TiO₂ and CeO₂. Samples produced by physically mixing the separately-synthesised TiO₂ and CeO₂ showed the best photocatalytic activity towards gaseous isopropanol degradation, while the samples with TiO₂ synthesised in the presence of CeO₂ showed the best photocatalytic stability.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115204"},"PeriodicalIF":5.2,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scaled up epoxidation of terpenes in microemulsion","authors":"Yacoub Mahamat Ahmat,&nbsp;Hilaire Mossak Kamkui,&nbsp;Serge Kaliaguine","doi":"10.1016/j.cattod.2025.115202","DOIUrl":"10.1016/j.cattod.2025.115202","url":null,"abstract":"<div><div>The dioxirane epoxidation was traditionally carried out in a two-phase medium: an organic solvent to dilute the olefin to be epoxidised and an aqueous medium in which the peroxymonosulphate oxidant is dissolved. This phase incompatibility generally requires a large quantity of oxidant and oxygen yield does not exceed 25 %. Despite the major advantages of this technique, it is still only used at laboratory scale. The aim of this study is to illustrate a dioxirane epoxidation ability to produce terpene epoxides at the scale of hundreds of milliliters. The technique employs an acetone catalyst that reacts with oxone® to in-situ form dimethyldioxirane, which epoxidizes the terpene. Oxone® is an aqueous oxidant. To remedy its incompatibility with hydrophobic terpene the use of a surfactant at concentration above its critical micelle concentration (cmc) enabled the terpene to be highly dispersed in the aqueous medium in absence of any additional organic solvent by forming a microemulsion, thus improving interface reaction rate and reducing oxygen loss. At 25°C and for a t_r of 90 min, several hundred milliliters of limonene, α-pinene, β-pinene, α-terpinene, γ-terpinene, β-myrcene and farnesene were easily epoxidized with both conversion and selectivity of almost 100 %. Oxygen yields of up to 80 % were achieved, against 29 % in absence of microemulsion. The high selectivity of epoxides, the solvent-free aqueous reaction, the ambient conditions, the simple acetone used as catalyst and the easy separation of epoxides from the aqueous medium make this innovative process more appropriate for easy scale-up.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115202"},"PeriodicalIF":5.2,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel hydrochar-modified hydrozincite designed and applied for the efficient degradation of pollutants in wastewater treatment","authors":"J.C. Castillo-Rodríguez ,&nbsp;M.P. Marco-Buj ,&nbsp;J. Giménez ,&nbsp;F.J. Tzompantzi-Morales ,&nbsp;C. Tzompantzi-Flores ,&nbsp;C. Sans-Mazón","doi":"10.1016/j.cattod.2025.115198","DOIUrl":"10.1016/j.cattod.2025.115198","url":null,"abstract":"<div><div>In the present study, materials based on hydrochar modified with hydrozincite were designed, varying the weight percentage of hydrozincite. The hydrozincite was prepared via a chemical co-precipitation method using thermal urea hydrolysis without any prior activation or calcination process. The hydrochar modified with hydrozincite was synthesized using a hydrothermal method at 300°C. These materials were applied in the photodegradation of contaminants. The characterization of these materials revealed that the presence of heterojunctions and oxygen vacancies plays a crucial role in the photocatalytic reaction mechanism. These materials were evaluated under UV light and a solar light simulator. The material that exhibited the highest photodegradation percentage contained 10 % by weight of hydrozincite. This suggests that these materials could be a promising alternative for the decomposition of such pollutants present in wastewater.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115198"},"PeriodicalIF":5.2,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Glycolysis of poly (ethylene terephthalate) using DBU-based ionic liquid catalysts","authors":"Fahimeh Forouzeshfar ,&nbsp;M.R. Coleman ,&nbsp;Joseph G. Lawrence","doi":"10.1016/j.cattod.2025.115187","DOIUrl":"10.1016/j.cattod.2025.115187","url":null,"abstract":"<div><div>This research investigated depolymerization of poly (ethylene terephthalate) (PET) via glycolysis using a series of ionic liquid (IL) catalysts. Organic acids were paired with 1,8-Diazabicyclo [5.4.0] undec-7-ene (DBU) to produce ionic liquids (DBU-ILs). The study explored the effect of structural variations in the organic acids on PET conversion and bis (2-hydroxyethyl) terephthalate (BHET) yield under optimized reaction conditions (specifically, EG:PET ratio of 5:1, temperature of 190 °C, reaction time of 120 min, and 5 mol% DBU in the catalyst relative to PET). The organic acids were selected to include variation in the (i) number of carboxylic acids available to complex with DBU and (ii) structure of the linker and pendant groups to adjust the lipophilicity of the catalyst. The catalytic activity of the DBU-IL increased with increasing lipophilicity of organic acid. Catalysts with organic acids with aromatic linkers (i.e. terephthalic acid) exhibited lower activities than aliphatic linkers at similar lipophilicity. Notably, a linear relationship was observed between the catalytic activity and lipophilicity for diacids with aliphatic linker of increasing chain length. The apparent rate constant for the DBU-azelaic acid was 32 % greater than for DBU-oxalic acid. Reusability studies showed that there was minimal degradation of the catalytic activity of the DBU-ILs over five reaction cycles.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"450 ","pages":"Article 115187"},"PeriodicalIF":5.2,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Endogenous base phosphine/dimethyl carbonate catalyzed depolymerization of poly(ethylene terephthalate)","authors":"Luoyu Gao ,&nbsp;Yanqi Shi ,&nbsp;Zhenjiang Li,&nbsp;Ziqi Liu,&nbsp;Min Zhang,&nbsp;Yue Xu,&nbsp;Xin Zou,&nbsp;Xin Yuan,&nbsp;Yongzhu Hu,&nbsp;Kai Guo","doi":"10.1016/j.cattod.2025.115203","DOIUrl":"10.1016/j.cattod.2025.115203","url":null,"abstract":"<div><div>Solvolysis of postconsumer poly(ethylene terephthalate) (PET) into monomeric feedstocks that can be recycled contributes value-added strategy to waste plastic management. Chemical route for PET recycling with sets of diols, diamines, and amino alcohols as the solvolytic reagents by endogenous basic ionic pair phosphonium organocatalyst was established. Methylation of tertiary phosphine with dimethyl carbonate produced <strong>q</strong>uaternary <strong>p</strong>hosphonium <strong>m</strong>ethyl <strong>c</strong>arbonate (QPMC) catalyst of strong basic character. QPMC depolymerized PET by virtually complete conversion with 78 % up isolated yield of monomers under optimal reaction conditions of 160 °C, 2 mol% catalyst loading, and 4 h. Catalytic solvolysis mechanism with ethylene glycol was probed by NMR titrations where methyl carbonate anion coordinated to hydroxyl of ethylene glycol by H-bonding, rather than H-abstraction by the basic methyl carbonate anion, was validated.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"450 ","pages":"Article 115203"},"PeriodicalIF":5.2,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards the effective removal of environmental strains of bacteria from real wastewater by heterostructured photocatalysts","authors":"Nadia Larumbe ,&nbsp;Samuel Moles ,&nbsp;M. Carmen Hidalgo ,&nbsp;Encarnación Rubio ,&nbsp;Pilar Goñi ,&nbsp;Rosa Mosteo","doi":"10.1016/j.cattod.2025.115197","DOIUrl":"10.1016/j.cattod.2025.115197","url":null,"abstract":"<div><div>Access to clean water is crucial for human health, yet microbial contamination poses significant challenges. This study investigates the effectiveness of novel photocatalytic catalysts: heterostructured TiO₂/AgBr and faceted titanium dioxide, for microbial inactivation under ultraviolet and visible light. Both catalysts were synthesized and characterized. Performance was evaluated using real wastewater samples and saline solutions, targeting gram-positive and gram-negative bacteria. The experimental approach included testing the photocatalysts with and without the addition of peroxydisulfate to assess its impact on inactivation effectiveness. Results indicated that the TiO₂/AgBr catalyst outperformed the faceted titanium dioxide one due to its superior visible light absorption and enhanced charge separation, achieving complete inactivation of environmental strains of <em>Escherichia coli</em> and significant inactivation for <em>Enterococcus faecalis</em> in real wastewater. The inclusion of peroxodisulfate with TiO₂/AgBr significantly improved inactivation rates, demonstrating a synergistic effect. Regarding wastewater composition, the treatment achieves a significant COD removal while the rest of studied parameters remain stable. Both catalysts effectively prevented bacterial regrowth for up to 48 hours, underscoring its long-term efficacy. Overall, these findings highlight the potential application of TiO₂/AgBr combined with peroxodisulfate as an effective strategy for microbial inactivation, contributing to the advancement in water treatment technologies across real environmental contexts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115197"},"PeriodicalIF":5.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rare-earth neodymium single atom catalyst for efficient electrochemical CO2 reduction","authors":"Tonglin Yang ,&nbsp;Fangqi Yang ,&nbsp;Fangqiang Yang ,&nbsp;Yang Ding ,&nbsp;Fa Cao ,&nbsp;Quan Zhang","doi":"10.1016/j.cattod.2025.115199","DOIUrl":"10.1016/j.cattod.2025.115199","url":null,"abstract":"<div><div>Electrochemical reduction of carbon dioxide (CO₂) to valuable fuels or feedstocks holds great promise for zero-emission carbon recycling and renewable energy storage. However, it remains a great challenge to prepare high-performance rare earth single-atom catalysts (SACs) for electroreduction of CO₂. In this work, we reported the facile synthesis of Nd SACs with atomically dispersed Nd-N₆ active sites by using g-C₃N₄ as support (Nd₁/NC) for efficient electroreduction of CO₂ to CO. Nd₁/NC exhibited a maximum FE of 83 % and a CO partial current density of 7.0 mA cm⁻², and a stability of 50 h at −0.8 V in an H-cell. Notably, a dramatically improved CO partial current density of 50.6 mA cm⁻² with FE_CO of up to 93 % was obtained in the flow cell. DFT calculations revealed that the Nd-N₆ sites facilitate the transfer of electrons from g-C₃N₄ to Nd, which strengthens the adsorption of the *COOH intermediate, contributing to the enhanced catalytic activity.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115199"},"PeriodicalIF":5.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photothermal activation of methane dry reforming on perovskite-supported Ni-catalysts: Impact of support composition and Ni loading method","authors":"Andrea Osti ,&nbsp;Simone Costa ,&nbsp;Lorenzo Rizzato ,&nbsp;Beatrice Senoner ,&nbsp;Antonella Glisenti","doi":"10.1016/j.cattod.2025.115200","DOIUrl":"10.1016/j.cattod.2025.115200","url":null,"abstract":"<div><div>The Dry Reforming of Methane (DRM) is an intriguing process to convert two greenhouse gases, CH₄ and CO₂, into syngas (CO+H₂) and to upgrade biogas into biosyngas. However, the challenges of high operating temperatures and catalyst deactivation have hindered its large-scale implementation so far. Recently, photothermal catalysis has emerged as a sustainable alternative to conventional thermocatalysis, enabling a reduction of the required temperature and improvement of catalyst stability. This approach necessitates the development of a suitable photocatalyst. Herein, we proposed the use of active Ni nanoparticles (NPs) with plasmonic features, supported over semiconductive perovskites LaFeO₃ or LaMnO₃ with La-deficiency. The incorporation of Ni was achieved through either B-site substitution within the perovskite lattice or surface loading via Ammonia Deposition Precipitation (ADP), followed by a reductive treatment under H₂ to yield Ni⁰ NPs. The prepared samples were extensively characterized by XRD, N₂ physisorption, H₂-TPR, SEM-EDX, HAADF STEM-EDX, XPS, UV-Vis DRS. The pre-reduced catalysts were then tested for thermal and photothermal DRM under visible light illumination (3 suns) at 600 °C. The Fe-based samples were poorly active because of Ni⁰ reoxidation, whereas a good activity and stability were ensured by Mn-perovskites, preserving the Ni⁰ active species. Among the Ni loading procedures, only ADP ensured improved activity in photothermal conditions thanks to high Ni NPs concentration, while the B-site doped catalyst showed better thermal than photo-activity because of low surface Ni concentration. Interestingly, light illumination was found to reduce perovskite decomposition and coke deposition. A Ni/Al₂O₃ reference catalyst demonstrated slightly higher activity than Ni/LaMnO₃ but suffered from much faster deactivation due to coking and reoxidation.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115200"},"PeriodicalIF":5.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of nickel phosphide phase on the photo-thermal catalytic hydrogenation of carbon dioxide","authors":"Hannah K. Hennig ,&nbsp;Jacob R. Schare ,&nbsp;Reilly P. Lynch ,&nbsp;Alex Bullock ,&nbsp;Michael S. Baldwin ,&nbsp;Mark E. Bussell","doi":"10.1016/j.cattod.2025.115185","DOIUrl":"10.1016/j.cattod.2025.115185","url":null,"abstract":"<div><div>The CO₂ hydrogenation (HYD) reaction was investigated over Ni phosphide (Ni₃P, Ni₁₂P₅, Ni₂P) catalysts to probe the effect of the Ni_xP_y phase on photo-thermal catalytic properties in comparison to Ni metal. The light absorption properties of 2.5 wt% Ni_xP_y/SiO₂ catalysts differ substantially, with the extent of light absorption decreasing as the P/Ni molar ratio of the Ni phosphide phase increases. This finding directly impacts the photo-thermal catalytic properties as the photo-enhancement (light activity / dark activity) correlates linearly with the extent of light absorption. For comparison purposes, 2.5 wt% Ni/SiO₂ catalysts were also investigated and showed high activity but suffered from low CO selectivity (57–68 %). A Ni₃P/SiO₂ catalyst was the most active of the Ni phosphides with high CO selectivity (&gt;95 %), while Ni₁₂P₅/SiO₂ and Ni₂P/SiO₂ catalysts had lower CO₂ HYD activities but CO selectivities above 98 %. Upon light exposure, the Ni_xP_y/SiO₂ (and Ni/SiO₂) catalysts exhibited significant rises of temperature (∼200 K increase from room temperature), indicating the importance of photothermal heating in increasing the CO₂ HYD rate. The findings highlight how a non-metal element (i.e., P) plays a crucial role in tailoring the photo-thermal catalytic properties of earth abundant nickel metal.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"449 ","pages":"Article 115185"},"PeriodicalIF":5.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}