工业工程最新文献

{"title":"Dynamic hysteresis brittle behavior and temperature–strain rate-coupled damage modeling: A multiscale study of poly(phthalazinone ether sulfone ketone) under extreme service conditions","authors":"Liangliang Shen ,&nbsp;Shi Su ,&nbsp;Wenhui Zhang ,&nbsp;Shilun Shi ,&nbsp;Xigao Jian ,&nbsp;Tianqi Zhu ,&nbsp;Jian Xu","doi":"10.1016/j.dt.2025.06.013","DOIUrl":"10.1016/j.dt.2025.06.013","url":null,"abstract":"<div><div>Poly (phthalazinone ether sulfone ketone) (PPESK) is a new-generation high-performance thermoplastic resin that exhibits excellent thermal stability and mechanical properties. However, its damage and failure mechanisms under high-temperature and high-strain-rate coupling conditions remain unclear, significantly limiting the engineering applications of PPESK-based composites in extreme environments such as aerospace. To address this issue, in this study, a temperature-controlled split Hopkinson pressure bar experimental platform was developed for dynamic tensile/compressive loading scenarios. Combined with scanning electron microscopy and molecular dynamics simulations, the thermomechanical behavior and failure mechanisms of PPESK were systematically investigated over the temperature range of 293–473 K. The study revealed a novel \"dynamic hysteresis brittle behavior\" and its underlying \"segmental activation–response lag antagonistic mechanism\". The results showed that the strain-rate-induced response lag of polymer chain segments significantly weakened the viscous dissipation capacity activated by thermal energy at elevated temperatures. Although high-strain-rate conditions led to notable enhancement in the dynamic strength of the material (with an increase of 8%–233%, reaching 130%–330% at elevated temperatures), the fracture surface morphology tended to become smoother, and brittle fracture characteristics became more pronounced. Based on these findings, a temperature–strain rate hysteresis antagonistic function was constructed, which effectively captured the competitive relationship between temperature-driven relaxation behavior and strain-rate-induced hysteresis in thermoplastic resins. A multiscale damage evolution constitutive model with temperature–rate coupling was subsequently established and numerically implemented via the VUMAT user subroutine. This study not only unveils the nonlinear damage mechanisms of PPESK under combined service temperatures and dynamic/static loading conditions, but also provides a strong theoretical foundation and engineering guidance for the constitutive modeling and parametric design of thermoplastic resin-based materials.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 259-273"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145278365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-precision quantitative analysis of 3-nitro-1,2,4-triazol-5-one (NTO) concentration based on ATR-FTIR spectroscopy and machine learning","authors":"Zhe Zhang ,&nbsp;Zhuowei Sun ,&nbsp;Haoming Zou ,&nbsp;Xijuan Lv ,&nbsp;Ziyang Guo ,&nbsp;Shuai Zhao ,&nbsp;Qinghai Shu","doi":"10.1016/j.dt.2025.06.008","DOIUrl":"10.1016/j.dt.2025.06.008","url":null,"abstract":"<div><div>3-Nitro-1,2,4-triazol-5-one (NTO) is a typical high-energy, low-sensitivity explosive, and accurate concentration monitoring is critical for crystallization process control. In this study, a high-precision quantitative analytical model for NTO concentration in ethanol solutions was developed by integrating real-time ATR-FTIR spectroscopy with chemometric and machine learning techniques. Dynamic spectral data were obtained by designing multi-concentration gradient heating-cooling cycle experiments, abnormal samples were eliminated using the isolation forest algorithm, and the effects of various preprocessing methods on model performance were systematically evaluated. The results show that partial least squares regression (PLSR) exhibits superior generalization ability compared to other models. Vibrational bands corresponding to C=O and –NO₂ were identified as key predictors for concentration estimation. This work provides an efficient and reliable solution for real-time concentration monitoring during NTO crystallization and holds significant potential for process analytical applications in energetic material manufacturing.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 131-141"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145278356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the dynamic response of HSTM under combined shock waves and sub-millimeter particle swarms loading","authors":"RuiJun Fan ,&nbsp;XiaoFeng Wang ,&nbsp;ShaoHong Wang ,&nbsp;JinYing Wang ,&nbsp;He Huang ,&nbsp;AiGuo Pi","doi":"10.1016/j.dt.2025.06.007","DOIUrl":"10.1016/j.dt.2025.06.007","url":null,"abstract":"<div><div>Low collateral damage weapons achieve controlled personnel injury through the coupling of shock waves and particle swarms, where the particle swarms arise from the high-explosive dispersion of compacted metal particle ring. To investigate the dynamic response of the human target under combined shock waves and particle swarms loading, a physical human surrogate torso model (HSTM) was developed, and the dynamic response test experiment was conducted under the combined loading. The effects of particle size on the loading parameters, the damage patterns of the ballistic plate and HSTM, and the dynamic response parameters of the HSTM with and without protection are mainly analyzed. Our findings revealed that particle swarms can effectively delay the shock wave attenuation, especially the best effect when the particle size was 0.28–0.45 mm. The ballistic plate mainly exhibited dense perforation of the outer fabric and impacted crater damage of ceramic plates, whereas the unprotected HSTM was mainly dominated by high-density and small-size ballistic cavity group damage. The peak values of the dynamic response parameters for the HSTM under combined loading were significantly larger than those under bare charge loading, with multiple peaks observed. Under unprotected conditions, the peak acceleration of skeletons and peak pressure of organs increased with the particle size. Under protected conditions, the particle size, the number of particles hit, and the fit of the ballistic plate to the HSTM together affected the dynamic response parameters of the HSTM.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 230-248"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145278362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic understanding of the selective C=C and C=O hydrogenation catalyzed by frustrated Lewis pairs on CeO2(110) from theoretical perspectives","authors":"Hong MA ,&nbsp;Siqing CHEN ,&nbsp;Jiamin CHEN ,&nbsp;Runlong DING ,&nbsp;Shaoli LIU ,&nbsp;Xinxin TIAN ,&nbsp;Jianbing WU ,&nbsp;Haitao LI ,&nbsp;Yongzhao WANG ,&nbsp;Yongxiang ZHAO","doi":"10.1016/S1872-5813(25)60564-0","DOIUrl":"10.1016/S1872-5813(25)60564-0","url":null,"abstract":"<div><div>Heterogeneous solid frustrated-Lewis-pair (FLP) catalyst is of great promise in practical hydrogenation applications. It has been found that all-solid FLPs can be created on ceria via surface oxygen vacancy regulation. Consequently, it is desired to investigate the mechanisms of the FLP-catalyzed hydrogenation of C=C and C=O and provide insight into the modification of CeO₂ catalysts for the selective hydrogenation. In this work, the reaction mechanism of the hydrogenation of CH₂=CH₂ and CH₃CH=O at the FLP sites constructed on CeO₂(110) surface was investigated by density functional theory (DFT), with the classical Lewis acid-base pairs (CLP) site as the reference. The results illustrate that at the CLP site, the dissociated hydride (H^{<em>δ</em>−}) forms a stable H−O bond with the surface O atom, while at the FLP site, H^{<em>δ</em>−} is stabilized by Ce, displaying higher activity on the one hand. On the other hand, the electron cloud density of the Ce atom at the FLP site is higher, which can transfer more electrons to the adsorbed C_C=C and O_C=O atoms, leading to a higher degree of activation for C=C and C=O bonds, as indicated by the Bader charge analysis. Therefore, compared to the CLP site, the FLP site exhibits higher hydrogenation activity for CH₂=CH₂ and CH₃CH=O. Furthermore, at the FLP sites, it demonstrates high efficiency in catalyzing the hydrogenation of CH₂=CH₂ with the rate-determining barrier of 1.04 eV, but it shows limited activity for the hydrogenation of CH₃CH=O with the rate-determining barrier of 1.94 eV. It means that the selective hydrogenation of C=C can be effectively achieved at the FLP sites concerning selective hydrogenation catalysis. The insights shown in this work help to clarify the reaction mechanism of the hydrogenation of C=C and C=O at FLP site on CeO₂(110) and reveal the relationship between the catalytic performance and the nature of the active site, which is of great benefit to development of rational design of heterogeneous FLP catalysts.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 10","pages":"Pages 1528-1539"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative surface modification strategy for ADN: PFOA-interlayered and vibrational magnetron sputtering for constructing anti-hygroscopic composite structures","authors":"Yinan Lyu ,&nbsp;Xiaoxia Ma ,&nbsp;Xiaoting Ren ,&nbsp;Shuping Sun ,&nbsp;Lin Shi ,&nbsp;Li Yang","doi":"10.1016/j.dt.2025.06.012","DOIUrl":"10.1016/j.dt.2025.06.012","url":null,"abstract":"<div><div>Ammonium dinitramide (ADN), as a high-energy oxidizer widely applied in the field of rocket and missile propellants, has a prominent issue of high hygroscopicity due to its strong polarity. The previous coating encapsulation methods have struggled to address the problems of uneven coating and polarity mismatch. This research innovatively introduces perfluorooctanoic acid (PFOA) as a polar transition intermediate layer. Utilizing the polarity of one end of it to adsorb on the surface of ADN through hydrogen bonds, the problem of polarity mismatch is effectively overcome. Meanwhile, the vibrational magnetron sputtering process has been first applied in the energetic field, with a special vibrating abutment enhancing ADN particle fluidity to solve coating non-uniformity, thus preparing prilled ADN@PFOA@PTFE core-dual-shell composites. Performance tests reveal that this composite material possesses excellent hydrophobic and anti-hygroscopic properties. When left at 25 °C and 75% RH for 3 days, moisture absorption was reduced by more than 90% compared to pure ADN. Simultaneously, its thermal stability, heat release performance, and combustion performance have been improved. The research achievements optimize the storage conditions of ADN in the application of rocket and missile propellants, providing solid support and broad development prospects for technological innovation in military fields.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 295-305"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145277813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proportional effects of RDX/Al mixtures on dust explosion characteristics, flame behavior, and explosion mechanism","authors":"Mengli Yin,&nbsp;Haoyang Guo,&nbsp;Erhai An,&nbsp;Kangjie Xie,&nbsp;Zijia Wang,&nbsp;Tengyue Song,&nbsp;Xiong Cao","doi":"10.1016/j.dt.2025.06.015","DOIUrl":"10.1016/j.dt.2025.06.015","url":null,"abstract":"<div><div>RDX/Al mixtures are widely utilized in energetic materials, yet their hybrid dust generated during production and application poses potential explosion hazards. Moreover, the synergistic explosion mechanisms remain poorly understood, particularly at varying dust concentrations. This study systematically investigates the effects of different aluminum powder mass percentages and dust concentrations (300 g/m³, 600 g/m³, 900 g/m³) on RDX dust explosion severity, flame propagation behavior, and gaseous products. The results indicate that the maximum explosion pressure peaks at 35% RDX, 65% RDX, and 80% RDX at 300 g/m³, 600 g/m³, and 900 g/m³, respectively. Concurrently, the time for the flame to propagate to the wall (<em>t</em>₁) reaches minimum values of 34.8 ms, 25.66 ms, and 23.93 ms. The maximum rate of pressure rise is observed for pure RDX at 900 g/m³. Aluminum powder enhances flame propagation velocity and combustion duration, as validated by the flame propagation system. Overall, the concentrations of carbon oxides (CO+CO₂) decrease significantly with increasing aluminum mass percentage. At 20% RDX, the concentrations decreased by 51.64%, 72.31%, and 79.55% compared to pure RDX at 300 g/m³, 600 g/m³, and 900 g/m³, respectively. Notably, N₂O concentration only at 300 g/m³ showed such a trend. It rises first and then falls at 35% RDX at 600 g/m³ and 900 g/m³. These findings elucidate the synergistic explosion mechanisms and provide critical guidelines for safe production and handling.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 71-83"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145277879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crashworthiness design of concave polygonal CFRP tubes for eVTOL applications under multi-angle compression loading","authors":"Jie Fu ,&nbsp;Qiang Liu ,&nbsp;Xiao Liu ,&nbsp;Yanqin Zhang","doi":"10.1016/j.dt.2025.06.016","DOIUrl":"10.1016/j.dt.2025.06.016","url":null,"abstract":"<div><div>The electric vertical takeoff and landing (eVTOL) aircraft shows great potential for rapid military personnel deployment on the battlefield. However, its susceptibility to control loss, complex crashes, and extremely limited bottom energy-absorbing space demands higher comprehensive crashworthiness of its subfloor thin-walled structures. This study investigated the energy absorption capacity of novel concave polygonal carbon fiber reinforced plastics (CFRP) tubes under multi-angle collisions. Quasi-static compression experiments and finite element simulations were conducted to assess the failure mode and energy absorption. The influences of cross-section shapes, loading conditions, and geometry parameters on crashworthiness metrics were further analyzed. The results revealed that, under the similar weight, concave polygonal tubes exhibited superior energy absorption under axial loads compared to regular polygonal and circular tubes, attributed to the increased number of axial splits. However, both regular and concave polygonal tubes, particularly the latter, demonstrated reduced oblique energy absorption compared to traditional square tubes with the increasing ratio of SEA value decreased from 20%−16%. Notably, this reduction in energy absorption can be compensated for by the implementation of inward and outward crusher plugs, and with them, the concave polygonal tubes demonstrated outstanding overall crashworthiness performance under multiple loading conditions. This concave cross-sectional design methods could serve as a guidance for the development of the eVTOL subfloor.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"52 ","pages":"Pages 100-115"},"PeriodicalIF":5.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145278355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure-activity relationships and catalytic performances of Ag- and Zn-doped Cu/MOR for methane C−H bond activation","authors":"Le YANG ,&nbsp;Xueyong LÜ ,&nbsp;Zile LIU ,&nbsp;Zhifeng YAN ,&nbsp;Zhijun ZUO","doi":"10.1016/S1872-5813(25)60592-5","DOIUrl":"10.1016/S1872-5813(25)60592-5","url":null,"abstract":"<div><div>Efficient activation of the C-H bond in methane (CH₄) is critical for achieving methane conversion at low-temperature. In this study, based on theoretical screening using the spin density (<em>ρ</em>) of active O atom as the activity descriptor, density functional theory (DFT) was utilized to investigate the adsorption of CH₄ and the mechanism of the subsequent C−H bond activation on Ag- and Zn-doped [Cu₃O₃]²⁺/mordenite (MOR) surfaces, as well as Zn-doped [CuOCu]²⁺/MOR surfaces, with high <em>ρ</em> values indicating high catalytic activation. The results demonstrated that CH₄ was physisorbed onto active O atom, followed by further activated to yield CH₃' radicals and surface OH groups via the radical reaction mechanism. Both Ag and Zn doping reduced the activation energy and reaction energy for the cleavage of the C−H bond in CH₄, promoting the C−H activation. Further electronic structure analysis revealed the spin polarization of electronic orbitals for both the active O atom and its bonded metal atoms. After Ag doping in [Cu₃O₃]²⁺/MOR, the formation of an Ag–O bond increased the gap between the spin-up and spin-down p-band centers of O 2<em>p</em> (Δ<em>ε_p</em>) and its spin density, which consequently enhanced the catalytic performance of the active O atom for C−H bond activation in CH₄. Zn doping into both [Cu₃O₃]²⁺/MOR and [CuOCu]²⁺/MOR also increased Δ<em>ε_p</em>. Specifically, when the Zn 4<em>s</em> and Zn 4<em>p</em> orbitals shifted downward to appropriate low energy levels, Zn 4s and Zn 4p interacted with O 2<em>p</em> to induce half-metallic characteristic in active O atom. This half-metallic characteristic exceptionally promoted C−H bond activation in CH₄, which was insufficiently predicted by the activity descriptors Δ<em>ε_p</em> and <em>ρ</em>.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 10","pages":"Pages 1540-1552"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the enhancement of stability in ambient pressure CO2-FTS for the production of α-olefins by Pt-modified FeZn catalysts","authors":"Zhangshi LI,&nbsp;Yufeng LI,&nbsp;Huanhuan HE,&nbsp;Changxu WANG,&nbsp;Bing LIU,&nbsp;Xiaohao LIU","doi":"10.1016/S1872-5813(25)60554-8","DOIUrl":"10.1016/S1872-5813(25)60554-8","url":null,"abstract":"<div><div>The CO₂-FTS under ambient pressure for α-olefins synthesis offers advantages such as safety, lower operating cost, and saving equipment investment. However, the reaction has encountered challenges including high selectivity for CO and CH₄, as well as poor catalyst stability. To address these issues, Cu, Co, Ru, and Pt-modified FeZn catalysts were designed and synthesized for the ambient pressure CO₂-FTS reaction. The results show that the introduction of Pt significantly improves the stability of CO₂ conversion, reducing the selectivity for by-products CO and CH₄, and promoting the formation of valuable C₂₊ hydrocarbon products. When optimized content of 6% Pt was incorporated into the FeZn catalyst, the CO₂ conversion rate increased from 22.5% to 27.3%, and no obvious deactivation was observed over 20 h. Correspondingly, the average selectivity for CO and CH₄ decreased obviously from 93.1% and 52.9% to 80.0% and 20.5%, respectively. Especially, when the H₂/CO₂ ratio was increased from 3 to 7, CO₂ conversion enhanced up to 48.6%, CO selectivity sharply decreased to 24.0%, and at the same time, the selectivity for C₂₊ hydrocarbon products increased noticeably. More importantly, the undesired selectivity to CH₄ was further lower toward about 13.1%, high α-olefins content was achieved like 90% \u0000\t\t\t\t<span><math><mrow><msubsup><mtext>C</mtext><mn>2</mn><mo>=</mo></msubsup><mo>-</mo><msubsup><mtext>C</mtext><mn>4</mn><mo>=</mo></msubsup></mrow></math></span> in the C₂−C₄ hydrocarbon fraction, and the selectivity to CO and CH₄ became stable. Characterization results from XRD, H₂-TPR, CO-TPD, CO₂-TPD, H₂-D₂ exchange, TEM, Raman, XPS and MES indicate that the introduction of Pt significantly enhances the adsorption and dissociation of CO, as well as the dissociation of H₂, thus promoting the hydrogenation and coupling of surface CO* species to form C₂₊ hydrocarbons and reducing the carbon deposits. It should be mentioned that the addition of Pt into FeZn catalyst has eliminated the formation of graphite carbon and reduced the thickness of amorphous carbon layer around the iron carbide nanoparticles. Moreover, Pt improves the carbonization ability of Fe species in the catalyst, increases the content of the active phase χ-Fe₅C₂ for FTS, and decreases the crystaline size of χ-Fe₅C₂ particles.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 10","pages":"Pages 1482-1499"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of FeOx-supported nano-silver catalyst and the mechanism of electrocatalytic epoxidation of propylene","authors":"Dengwen PI ,&nbsp;Xiaobo YANG ,&nbsp;Xuning LI","doi":"10.1016/S1872-5813(25)60546-9","DOIUrl":"10.1016/S1872-5813(25)60546-9","url":null,"abstract":"<div><div>The electrochemical oxidation of propylene offers a promising green process route for propylene oxide (PO) synthesis. However, due to complex by-products and low yields, its development has been hampered. Therefore, it is crucial to explore the reaction mechanism of propylene epoxidation to guide the targeted design of efficient catalysts. In this work, FeO_<em>x</em>-supported nano-silver catalysts (Ag-Fe₂O₃) were designed to achieve the efficient utilization of noble metal Ag to use for the electro-catalytic epoxidation of propylene, and the Ag loading in Fe₂O₃ was regulated by a hydrothermal method combined with a co-precipitation method. When the loading of Ag in Fe₂O₃ is 1.82%, it effectively enhanced the efficiency of the propylene epoxidation reaction, with the Faraday efficiency of 26.2% for PO, and its performance was superior to that of Fe₂O₃ and other samples with different loadings. The bifunctional mechanism was clarified by <em>in situ</em> attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), where propylene was adsorbed on the surface of Fe₂O₃ and the nano-Ag sites promoted the generation of reactive oxygen species such as *O and *OOH. This work elucidates synergistic catalytic effect between metal and support, provides new mechanistic insights for the electrochemical epoxidation of propylene, and offers possible theoretical guidance for the design of high-performance catalysts.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 10","pages":"Pages 1500-1508"},"PeriodicalIF":0.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}