Catalysis Letters最新文献

{"title":"A Novel N-heterocyclic Carbene Containing [Fe–Fe] Hydrogenase Model Complex as Bio-Mimetic Catalyst For Proton Reduction and Benzene Hydroxylation","authors":"Xia Zhang,&nbsp;Jiazheng Sun,&nbsp;Meixiang Gao","doi":"10.1007/s10562-024-04849-x","DOIUrl":"10.1007/s10562-024-04849-x","url":null,"abstract":"<div><p>This study reports the synthesis of a new di-iron complex, μ-(SCH(CH₂CH₃)CH₂S)Fe₂(CO)₅IPr (<b>2</b>, where IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), and its comprehensive characterization using mass spectrometry, elemental analysis, solution IR, and NMR spectroscopy. The CO/L substitution reaction was used to introduce the sterically hindered nitrogen-containing heterocyclic carbene ligand (IPr) and coordinate it to the iron center under mild conditions. The di-iron complex was studied for its potential in proton electrocatalysis and benzene hydroxylation. Complex <b>2</b> underwent two irreversible reductions around − 2.204 V and effectively facilitated proton reduction into hydrogen using HOAc as the proton source. Complex <b>2</b> catalyzed the hydroxylation of benzene, resulting in a phenol yield of 12.9% and nearly 96% selectivity.</p><h3>Graphical Abstract</h3><p>A new diiron complex µ-(SCH(CH₂CH₃)CH₂S)Fe₂(CO)₅IPr was synthesized and characterized by solution IR spectra, mass spectrum,NMR spectra and elemental analysis. This complex were used as catalyst for proton reduction and benzene hydroxylation.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual Role of Choline Azide for One-Pot Synthesis of Quinolines and Quinazolines Using Versatile Magnetic Cu-Oxalate@Fe3O4 Catalyst","authors":"Akshay S. Limaye,&nbsp;R. Thrilokraj,&nbsp;Shoyebmohamad F. Shaikh,&nbsp;Umesh A. Kshirsagar,&nbsp;Jan Grzegorz Małecki,&nbsp;Abdullah M. Al-Enizi,&nbsp;Pravin Y. Kogale,&nbsp;Ramesh B. Dateer","doi":"10.1007/s10562-024-04856-y","DOIUrl":"10.1007/s10562-024-04856-y","url":null,"abstract":"<div><p>The present study demonstrates biogenically synthesized copper-oxalate supported on iron oxide (Fe₃O₄) and its implementation for pharmaceutically important quinoline and quinazoline synthesis. The formation of a new catalyst was confirmed by Field emission scanning electron microscope (FE-SEM) and Brunauer–Emmett–Teller (BET) analysis that displayed a spherical shape with a surface area of 18.407 m² g⁻¹, and an active metal concentration of 12.02 w/w%. The dual role of choline azide as a green solvent as well as a nitrogen source is demonstrated and a series of quinoline and quinazoline derivatives were synthesized in good to excellent yield. Importantly, catalyst recyclability, mechanistic investigations, control experiments, and reaction economy highlight the importance of methodology.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green Synthesis Montmorillonite Clay Supported Co3O4 Nanoparticles and Its Catalytic Efficacy Towards Baeyer–Villiger Oxidation","authors":"Subrat Jyoti Borah,&nbsp;Rashmi Rekha Hazarika,&nbsp;Sumit Gorh,&nbsp;Dipanka Dutta","doi":"10.1007/s10562-024-04872-y","DOIUrl":"10.1007/s10562-024-04872-y","url":null,"abstract":"<div><p>Co₃O₄ nanoparticles supported on modified montmorillonite clay (Co₃O₄@Mont) were synthesized by using green natural extract (tulsi leaf) under mild reaction conditions. The modification of montmorillonite clay was executed by refluxing the clay with H₃PO₄ under controlled condition to generate a porous matrix with high surface area which acts as support for the generation and stabilization of nanoparticles. The Co₃O₄@Mont nanocomposite was characterized by UV–Visible spectroscopy, Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM–EDX), Transmission Electron Microscopy (TEM), Powder X-Ray Diffraction (P-XRD) and N₂-adsorption–desorption analysis. The synthesized nanocomposite showed excellent catalytic efficacy towards the Baeyer–Villiger oxidation of various Ketones using H₂O₂ as oxidant at room temperature. The catalytic B-V oxidation gives the best results in aqueous medium and gives maximum conversion of the product in 1 h. The completion of the reaction in short time (1 h) under mild reaction conditions with green solvent signifies the applicability of the nano-catalyst for the B-V oxidation over other reported catalyst. Also, the catalyst can be recovered easily by simple filtration at the end of the reaction. Further, the recyclability of the used Co₃O₄@Mont nano-catalyst for the same substrate was performed and its catalytic efficacy is maintained without any significant loss for various catalytic cycles.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Colorimetric Assay for the Detection of Bisphenol A Using Laccase and Mediator Immobilized on Polyvinyl Alcohol Hydrogels","authors":"Syeda Fauzia Farheen Zofair,&nbsp;Masood Alam Khan,&nbsp;Khushtar Anwar Salman,&nbsp;Hina Younus","doi":"10.1007/s10562-024-04877-7","DOIUrl":"10.1007/s10562-024-04877-7","url":null,"abstract":"<div><p>A novel, simple and low-cost colorimetric sensor has been developed for the detection of bisphenol A (BPA). In the assay, laccase catalyses the reaction between BPA and 2,2-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) [ABTS] radicals, resulting in a colored product showing λ_max at 560 nm. Raman spectroscopy and mass spectra analysis of the product suggests the possible formation of ABTS dication radicals. This assay could detect BPA up to 2 µM by the naked eye, which is lower than the European Union specific migration limit of 2.6 µM. UV–visible spectroscopy showed a linear response in the concentration range of 1.0–10.0 µM with a lower detection limit of 0.5 µM. Sensitivity of the assay was enhanced by 40 folds when laccase and ABTS were fabricated on polyvinyl alcohol (PVA) hydrogel beads, allowing BPA to be detected at concentrations as low as 50 nM. These hydrogel beads were highly stable for long-term storage. Screening of different phenolic contaminants showed that laccase along with ABTS exhibits propensity for para-substituted alkyl-phenols that are considered as xenoestrogens and are highly toxic, estrogenic and carcinogenic in nature. Thus, the assay developed may be utilized for <i>in-situ</i> monitoring of BPA and other toxic xenoestrogens present in the environment. Additionally, its applicability can be extended towards other potential laccase mediators.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photothermal Oxidation of Cyclohexane Over CeO2/g-C3N4 Composite with S-Scheme Heterojunction in Solvent-Free Conditions","authors":"Fangruo Ding,&nbsp;Ya Wang,&nbsp;Zhijun Shi,&nbsp;Changsheng Gao,&nbsp;Mei Kan,&nbsp;Qianli Liang,&nbsp;Zheng Gao,&nbsp;Shiqing Li,&nbsp;Rusi Peng,&nbsp;Ying Ma,&nbsp;Wenchao Shangguan,&nbsp;Sugang Meng,&nbsp;Shifu Chen","doi":"10.1007/s10562-024-04880-y","DOIUrl":"10.1007/s10562-024-04880-y","url":null,"abstract":"<div><p>The selective oxidation of saturated C-H bonds has long been a significant challenge in chemical research, with the partial oxidation of cyclohexane (Cy) to KA oil (a mixture of cyclohexanol and cyclohexanone) using molecular oxygen (O₂) recognized as one of the most important reactions. In this study, we demonstrate the selective oxidation of cyclohexane via photothermal synergism under solvent-free conditions and in the presence of a co-catalyst system. We have elucidated the synergistic effect of the CeO₂/g-C₃N₄ composite catalyst in the photothermal oxidation of cyclohexane. The CeO₂/g-C₃N₄ composite achieved a cyclohexane conversion of 13% and a KA oil selectivity of 97.5%, surpassing the simple additive effects of photocatalysis and thermal catalysis. Through extensive characterization techniques, we present a detailed mechanistic study. Photo-generated electron–hole pairs facilitate the valence cycling of metals during thermal processes, while heat promotes the efficient utilization of these carriers. Furthermore, lattice oxygen can trap holes, reducing the recombination probability of photo-generated charge carriers. This interaction results in a synergistic effect between light and heat, elucidating the phenomenon of photothermal cooperative catalysis in the composite catalyst. These findings suggest that photothermal co-catalysis holds considerable potential for widespread application in green industrial catalytic processes, offering high selectivity and efficiency in organic transformations.</p><h3>Graphical Abstract</h3><p>Herein, we synthesized a CeO2/g−C3N4 composite with S−scheme heterojunction as a photothermal catalyst, and employed it for the oxidation of Cy to K−A oil in a solvent−free system. CeO2 demonstrates prominent photothermal synergy, and the addition of g−C3N4 can enhance the utilization of electron–hole pairs. This method significantly improves cyclohexane conversion and KA oil selectivity and exceeds the sum of generations of pure photocatalysis and thermal catalysis. The results provide a mechanistic description for photothermal co−catalysis and demonstrate its potential for widespread use in green industrial catalysis</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Catalytic Activity of Carob Extract-Capped Silver Nanoparticles in the Remediation of Recalcitrant Nitroaromatics","authors":"Gamze Tan,&nbsp;Idris Sargin","doi":"10.1007/s10562-024-04884-8","DOIUrl":"10.1007/s10562-024-04884-8","url":null,"abstract":"<div><p>Nitroaromatic compounds are highly stable pollutants in the aquatic environment, posing serious health risks due to their mutagenic, carcinogenic, and toxic nature. In this study, the catalytic reduction of four organic pollutants (<i>o</i>-aminonitrobenzene, <i>p</i>-nitrophenol, 2,4-dinitrophenol, and 1,2-diamino-4-nitrobenzene) to corresponding aminobenzenes was achieved using sodium borohydride (NaBH₄, the reducing agent) and carob extract-capped silver nanoparticles (cc-AgNPs; the catalyst) under ambient conditions. The silver catalyst, cc-AgNPs, was biosynthesized, adopting an eco-friendly green synthesis approach in which carob (<i>Ceratonia silique</i> L.) pod water extract was used as a reducing and capping agent. The cc-AgNPs were characterized using various techniques, including Ultraviolet-visible (UV-vis) spectroscopy, Fourier Transform Infrared spectrometer (FT-IR), Transmission Electron Microscopy (TEM), zeta size and potential measurements. The UV-vis spectra of cc-AgNPs showed a characteristic surface plasmon resonance peak at 422–425 nm. Analysis of the FT-IR spectrum confirmed that the cc-AgNPs were coated with carob extract. Zeta potential measurement indicated that the surface charge of the catalyst was negative (-21.4 ± 0.7 mV). Based on TEM results, the average size of the cc-AgNPs was 33–43 nm. cc-AgNPs reduced the nitroaromatics to aminobenzene derivatives in &lt; 1 min. in the presence of the reductant NaBH₄. The study revealed that cc-AgNPs are effective in catalytic hydrogenation of nitroaromatics. The cc-AgNPs can be used in environmental remediation to eliminate persistent nitroaromatics and convert them into valuable amino benzene precursors. These precursors can then potentially be used to produce various organic compounds for applications in the pharmaceutical, organic synthesis, and dye production industries.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving a Large Reactivity Activity Improvement in Adenine Modified Pd/Co-MOFs Catalyst for Quinoline Hydrogenation","authors":"Lu Yang,&nbsp;Tao Yuan,&nbsp;Haoyi Xu,&nbsp;Tingling Li,&nbsp;Wei Xiong,&nbsp;Derong Liu","doi":"10.1007/s10562-024-04861-1","DOIUrl":"10.1007/s10562-024-04861-1","url":null,"abstract":"<div><p>The chemo-selective hydrogenation of quinoline is a critical reaction, producing high-value chemical intermediates such as pharmaceuticals, pesticides, and dyes. Traditional heterogeneous catalysts for this reaction typically require higher and more stringent reaction conditions due to the stable π-conjugated structure of quinoline. To achieve this transformation, some innovative strategies must be developed to enhance the catalytic properties of conventional catalysts. In this work, adenine was employed as a novel structural modifier to finish Co-MOFs materials and prepare Pd/Co-MOFs_(A) catalysts. The introduction of adenine efficiently enhanced structural stability and catalytic efficiency of original Pd/Co-MOFs catalyst. A remarkable increase of approximately 441% in catalytic conversion was obtained compared to the unmodified catalyst. This substantial improvement in catalytic performance could be attributed to mass transfer enhancement. The N-heterocyclic conjugated structure facilitated π–π stacking interactions and hydrogen bonding between the catalyst and quinoline, thereby accelerating mass transfer and improving catalytic efficiency. Under mild reaction conditions, the Pd/Co-MOFs_(A) catalyst fully demonstrated its high catalytic performance, achieving a 99.0% quinoline conversion and a 99.9% selectivity toward 1,2,3,4-tetrahydroquinoline. Finally, the Pd/Co-MOFs_(A) catalyst presented in this study could pave the way for enhancing the catalytic performance of traditional heterogeneous catalysts through alkaloid modification in quinoline hydrogenation.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlled Fabrication of Mo2C/C Nanospheres via Electrospinning Technique as Electrocatalysts for the Hydrogen Evolution Reaction","authors":"Zexin Wu,&nbsp;Haoyu Zhang,&nbsp;Junyu Zhao,&nbsp;Hongshun Hao,&nbsp;Shuang Yan","doi":"10.1007/s10562-024-04845-1","DOIUrl":"10.1007/s10562-024-04845-1","url":null,"abstract":"<div><p>A strategy was proposed for the synthesis of Mo₂C/C composite as an efficient electrocatalyst through electrospinning and calcination. PVP and PAN were utilized as electrospinning precursors for comparative analysis. Morphological characterization revealed that an electrospinning solution with the viscosity in the range of 2–5 mPa·S was conducive to the formation of spherical morphology. Under calcination at nitrogen atmosphere, as-electrospun Mo@PVP-1 and Mo@PAN-1 samples transformed into Mo₂C/C with bead-like structure at 900 and 800 °C, respectively. Compared to PVP, PAN exhibited greater resistance to deformation at elevated temperature, resulting in better-dispersed spherical Mo₂C/C composite. The synthesized Mo₂C/C exhibited good electrocatalytic activity for hydrogen evolution reaction. The Tafel slopes of Mo₂C/C prepared from Mo@PVP-1-900 and Mo@PAN-1-800 were 75.85 and 164.7 mV·dec⁻¹, respectively. This work contributes to the understanding of synthetic process of spherical Mo₂C/C composites through electrospinning, providing an effective way to improve material performance.</p><h3>Graphical Abstract</h3><p>Mo₂C/C composites were synthesized by calcination with different polymer solutions (PAN and PVP) by electrostatic spraying, and their performance as catalysts was tested.</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catalytic Fatty Acid Methyl Esters (FAMEs) Synthesis Using Lepidium aucheri Seed Oil and Its Antibacterial Potential","authors":"Saeedah Musaed Almutairi,&nbsp;Sarah Faiez Aldossery,&nbsp;Khabibullaev Jamshidbek,&nbsp;Asqarov Ibrohimjon Rahmonovich,&nbsp;Azize Demirpolat,&nbsp;Khasanova Labor,&nbsp;Sabhya Pathania","doi":"10.1007/s10562-024-04876-8","DOIUrl":"10.1007/s10562-024-04876-8","url":null,"abstract":"<div><p>One of the best renewable energy sources that can replace petroleum fuel is biodiesel, which may be produced through catalytic transesterification. However, there is a risk that some of these plant-based biofuels may actually promote bacterial colonies while damaging the methyl esters that are synthesised. The present study aimed to assess the cadmium oxide (CdO) nanocatalyst in the catalytic transesterification of <i>Lepidium aucheri</i> seed oil into fatty acid methyl esters (FAMEs) as a source of Biodiesel and the potential of the seed oil against bacterial activities as possible source of bio-additive for biofuels. For biodiesel synthesis, a cadmium oxide (CdO) nanocatalyst was synthesised and characterised via SEM, FT-IR, and EDX. The biodiesel yield using the CdO catalyst was 88% when the reaction was carried out for 2 h at 75 °C with an ideal mixture of 12:1 oil to methanol molar ratio and a catalyst concentration of 2% utilising LASO. The antibacterial activity of two bacterial strains (<i>Escherichia coli</i> and <i>Bacillus subtilis</i>) was investigated via the agar well diffusion method. The maximum antibacterial activity was observed with 100 µl of LASO, which inhibited <i>Bacillus subtilis</i> and <i>Escherichia coli,</i> resulting in a 24.7 mm inhibition zone. It was also put to use in the biodiesel synthesis process, trans-esterifying nonedible LASO into methyl esters for the synthesis of Biodiesel. The synthesised biodiesel was subjected to analyses via GC‒MS, FT‒IR, and NMR. The investigation concluded that the biodiesel sector may be used the feedstock as a raw material at the commercial level.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Base-Free Conversion of 1, 2-Propanediol to Methyl Lactate in Methanol Over Cu-Modified Au/ Hydroxylapatite Catalysts","authors":"Junying Tian,&nbsp;Yingying Fan,&nbsp;Tao Wei,&nbsp;Qingxia Guo,&nbsp;Weiguo Fang,&nbsp;Yongle Guo","doi":"10.1007/s10562-024-04838-0","DOIUrl":"10.1007/s10562-024-04838-0","url":null,"abstract":"<div><p>The catalytic oxidative esterification of 1, 2-propanediol to methyl lactate in a base-free methanol system over Cu-modified Au/HAP catalysts was investigated. The catalysts demonstrated efficient activity in converting 1, 2-propanediol to methyl lactate without any base additives, achieving a conversion of 91.2% and a selectivity of 45% for methyl lactate under optimized conditions of 160 °C, 2 h, and 1.0 MPa O₂ over 2Au12Cu/HAP catalyst. The Au sites were identified as pivotal in catalyzing the oxidation of 1, 2-propanediol, and the basic sites of HAP was hypothesized to play a similar role with base additives to enhance the catalytic activity of Au. Furthermore, modification of Cu to Au was observed to promote the oxidation of the hydroxyacetone intermediate to methyl lactate while effectively suppressing the over-oxidation of methyl lactate, thus increased selectivity of methyl lactate.</p><h3>Graphical Abstract</h3><p>1,2-propanediol was convertedto methyl lactateefficientlyin a base-free methanol system over Au-Cu/HAP catalysts</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}