Journal of Rare Earths最新文献

{"title":"Structural, optical, and photocatalytic properties of Bi1–xRExFeO3 (RE=La, Ce, Pr, Nd, Sm; x=0, 0.05, 0.1) thin films","authors":"Ahmad Gholizadeh,&nbsp;Sakineh Hosseini","doi":"10.1016/j.jre.2024.02.016","DOIUrl":"10.1016/j.jre.2024.02.016","url":null,"abstract":"<div><div>Bismuth ferrite perovskite materials have recently attracted great attention because of their unique properties. In this study, Bi_{1–<em>x</em>}RE_<em>x</em>FeO₃ (RE = La, Ce, Pr, Nd, Sm; <em>x</em> = 0, 0.05, 0.1) thin films were deposited on glass substrates via low-temperature sol–gel assisted spin coating procedure. It is found that in the presence of light rare-earth ions as the substitutions, the structural, morphological, and optical properties of the thin films are changed in the prepared thin films. We find that the thin films have rhombohedral structures, and from field emission scanning electron microscopy (FESEM) images, it is observed that the substitution of light rare-earth ions for Bi³⁺ affects the surface morphology and grain size of the BiFeO₃ (BFO) thin film. Moreover, the optical properties of prepared films were investigated via UV–visible spectroscopy. For all samples, the bandgap energy values are between 1.22 and 1.65 eV. Also, the refractive index and extinction coefficient of samples are about 1.14–1.41 and 0.1–0.6, respectively. Photocatalytic properties of the samples were investigated by measuring the degradation of methylene blue (MB) dye under irradiation of sunlight. We find that the light rare-earth substituted BFO thin films have better photocatalytic activity compared to pure BiFeO₃ thin film, the reason can be described as the band gap varied between 1.20 and 1.65 eV for different rare earth ions which directly influences the photocatalytic properties of the investigated samples. It is observed that the prepared thin films can remove between 37.18% and 69.14% of dye after 180 min of irradiation. This study confirms that prepared thin films are a suitable candidate for photocatalytic applications.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 81-88"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140466388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Designing high-reflectivity AlN composite substrates by introduction of TiO2 to synthesize green/white converters for high-brightness reflective laser illumination☆","authors":"Qianxiong Wen ,&nbsp;Cong Zhao ,&nbsp;Meilin Fu ,&nbsp;Yusai Xu ,&nbsp;Xiangjia Sun ,&nbsp;Jiaying Zheng ,&nbsp;Yanrong Liang ,&nbsp;Weidong Xiang ,&nbsp;Xiaojuan Liang ,&nbsp;Zhaoping Chen","doi":"10.1016/j.jre.2023.09.022","DOIUrl":"10.1016/j.jre.2023.09.022","url":null,"abstract":"<div><div>Phosphor-in-glass (PiG) has been prepared into various types of phosphor films owing to its simplicity process, exceptional color purity, and convenient color adjustability. Nevertheless, existing reflective PiGs films have encountered limitations in terms of stability and feasibility as reliable color converters, mainly attributed to issues related to thermal deposition and insufficient optical efficiency. Herein, we propose to use AlN substrate with superior thermal conductivity to coat the TiO₂ layer to obtain TiO₂–AlN (TA), which enhances the reflectivity of blue light to facilitate the light conversion process. By incorporating highly thermally stable LuAG:Ce-PiGs on a TA substrate, the LuAG:Ce-PiTA converter exhibits a luminous flux of 1102 <span><span><span>[email protected]</span></span><svg><path></path></svg></span> W, and maintains a relative intensity of 94.6% at 473 K benefiting from the high thermal conductivity of 34.1 W/(m·K). The addition of CASN₃:Eu to the color converter 50 L&amp;10C-PiTA enables an impressive CRI of 90.7. Relative luminescence intensities of LuAG:Ce-PiTA and 50 L&amp;10C-PiTA only decrease by 5.35% and 3.28%, respectively, in the 24 h illumination aging decay test of the reflective laser module. The results confirm the suitability of the optimally designed TA substrate for LuAG:Ce color converter applications in high-power reflective laser illumination.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 64-72"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134935515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control upconversion decay dynamics from perspective of collective response","authors":"Yingdong Han ,&nbsp;Yutong Pan ,&nbsp;Tong Wei ,&nbsp;Yu Ma ,&nbsp;Xingxing Zhang ,&nbsp;Lei Jiang ,&nbsp;Kai Chen ,&nbsp;Liwei Wu ,&nbsp;Jiao Cui ,&nbsp;Chao Gao","doi":"10.1016/j.jre.2023.10.015","DOIUrl":"10.1016/j.jre.2023.10.015","url":null,"abstract":"<div><div>Very recently, upconversion luminescence (UCL) lifetime, as a powerful optical dimension, has attracted tremendous research interest due to its advantages of high information capacity and high photophysical stability. With the implementation and emergence of endlessly fascinating UCL features, it is particularly meaningful to understand the photophysical mechanisms inside UCL materials to enable rational subdivision-level structure design, which is however currently far from sufficient. In this work, we take an ordinary upconversion nanoparticle as an example to prove that the UCL decay curves and corresponding lifetimes are indeed a collective response of the entire UCL system to excitations, that exhibits correlated, yet quite different properties from individual ions. A specially developed theoretical random walk model combined with an experimental lifetime control for Yb³⁺/Er³⁺ UCL demonstrates that energy diffusion principally alters the decay rate. Moreover, the different extent of the influence of energy diffusion on the emissions of ²H_11/2/⁴S_3/2 (green) and ⁴F_9/2 (red) leads to an extremely uncommon cross-over comparison of decay rates. This work provides new ideas for understanding decay dynamics and practical UCL lifetime manipulation methods.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 57-63"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135371256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boosting characteristic emissions of lanthanide in Cs2Ag0.6Na0.4InCl6–xBrx double perovskites via mixing halide","authors":"Shujian Wang ,&nbsp;Dejian Chen ,&nbsp;Jie Hu ,&nbsp;Sisi Liang ,&nbsp;Kunyuan Xu ,&nbsp;Maochun Hong ,&nbsp;Haomiao Zhu","doi":"10.1016/j.jre.2024.01.001","DOIUrl":"10.1016/j.jre.2024.01.001","url":null,"abstract":"<div><div>Lanthanide ions (Ln³⁺) doping provides a potential strategy to control over the luminescent properties of lead-free halide double perovskite nanocrystals (DP NCs). However, due to the low energy transfer efficiency between self-trapped exciton (STE) and Ln³⁺ ions, the characteristic emissions of Ln³⁺ ions are not prominent. Furthermore, the energy transfer mechanism between STE and Ln³⁺ ions is also elusive and requires in-depth study. We chose trace Bi³⁺-doped Cs₂Ag_0.6Na_0.4InCl_{6–<em>x</em>}Br_<em>x</em> as a representative DP matrix to demonstrate that by tuning the bromide concentration, the Ln³⁺ emission can be greatly enhanced. Such enhanced STE and Ln³⁺ ions energy transfer originates from the high covalency of Ln–Br bond, which contributes to improvement of the characteristic emission of Ln³⁺ ions. Furthermore, optical spectroscopy reveals that the energy transfer mechanism from DP to Eu³⁺ ions is different from all the other doped Ln³⁺ ions. The energy transfer from DP to Eu³⁺ ions is mostly through Eu–Br charge transfer while the other Ln³⁺ ions are excited by energy transfer from STE. The distinct energy transfer mechanism has resulted from the energy separation between the excited energy level of Ln³⁺ ions and the bottom of conduction band of DP. With increasing the energy separation, the energy transfer from STE to Ln³⁺ ions is less efficient because of the generation of a larger number of phonons and finally becomes impossible for Eu³⁺ ions. Our results provide new insight into tuning the energy transfer of Ln³⁺-doped DP NCs.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 39-46"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139095161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review on micro-mechanism of forming emulsification during rare earth extraction by acidic extractants","authors":"Jie Liu ,&nbsp;Yuxiu Zhao ,&nbsp;Zhirong Wang ,&nbsp;Minghui Jia ,&nbsp;Wenxiang Xia ,&nbsp;Guizhi Wu ,&nbsp;Wenda Guo ,&nbsp;Ru’an Chi ,&nbsp;Kun Huang","doi":"10.1016/j.jre.2023.12.009","DOIUrl":"10.1016/j.jre.2023.12.009","url":null,"abstract":"<div><div>Solvent extraction is the main method used to separate and purify rare earth elements. In the process of rare earths extraction, emulsification often generated due to the instability of the aqueous and organic phases or improper operating conditions. Once emulsification occurs, it would not only lead to low rare earths recovery efficiency, small product quantities, high production costs and the losing of extractant and rare earth resources, but also result in serious environmental pollution. Therefore, it is very important to study the micro-mechanisms of emulsification and establish new methods to prevent emulsification at the source. In this paper, possible factors resulting in emulsification, such as the compositions and properties of the organic and aqueous phases, the operating conditions of the rare earths extraction are reviewed. The micro-mechanisms of emulsification are summarized basing on the microscopic structures in the bulk phase, aggregations of the extractants at the organic-aqueous interface, spectral characterizations and computational simulations. On this basis, new formation mechanisms are proposed for emulsification. Preliminary explorations are employed to verify the correctness of these new viewpoints. Finally, future directions for studies of the emulsification micro-mechanism are proposed. This study provides a theoretical basis for further understanding the micro-mechanisms of interfacial instability resulting in emulsification in the process of rare earths extraction.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 9-20"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138741709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Eu–Er substitution on structural, optical, dielectric, and electrical properties of Ba0.5Sr0.5EuxErxFe12–2xO19 hexaferrite","authors":"Jayashri Mahapatro ,&nbsp;Sher Singh Meena ,&nbsp;Sadhana Agrawal","doi":"10.1016/j.jre.2024.01.010","DOIUrl":"10.1016/j.jre.2024.01.010","url":null,"abstract":"<div><div>The present work reports the structural, optical, dielectric, and electrical properties of Eu–Er substituted M-type Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ (<em>x</em> = 0, 0.05, 0.1, 0.15, and 0.2) hexaferrites synthesized by sol–gel combustion method. The hexagonal structure of the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples was confirmed from X-ray diffraction (XRD) analysis. The values of lattice parameters of the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples are increased as compared to Ba_0.5Sr_0.5Fe₁₂O₁₉ sample. This increase in the value of lattice parameters is attributed to the substitution of larger cations (Eu³⁺ and Er³⁺) in place of smaller cations (Fe³⁺ ions). The crystallite sizes of the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples also increase due to the substitution of larger cations. The force constants (<em>K</em>_o and <em>K</em>_t) increases with increasing Eu–Er concentration. The octahedral cluster shifts towards the higher wavenumber side whereas the tetrahedral cluster shifts towards the lower wavenumber side due to Eu–Er substitution in the Fourier transform infrared (FTIR) spectra. The photoluminescence (PL) emission spectra for the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples are observed at 365 nm. The dielectric dispersion in the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples can be understood by Koop's theory and Maxwell–Wagner type of interfacial polarization. Using Jonscher's power law and the correlated barrier hopping (CBH) model, the frequency and temperature-dependent behaviour of ac conductivity of Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples are described. The temperature-dependent behaviour of the dc conductivity of the Ba_0.5Sr_0.5Eu_<em>x</em>Er_<em>x</em>Fe_{12–2<em>x</em>}O₁₉ samples is explained by the variable range hopping (VRH) model. The Motto temperature of the sample varies from 4.55 <span><math><mrow><mo>×</mo></mrow></math></span> 10⁹ to 2.31 <span><math><mrow><mo>×</mo></mrow></math></span> 10⁸ K. The estimated maximum barrier height (<em>W</em>_M) of the compound varies from 0.6603 to 0.1199 eV. The temperature coefficient and activation energy of the samples were also calculated as a function of Eu–Er concentration.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 115-123"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139497527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploratory growth and characterization of CaNdAl3O7 single crystal with nonsymmetric structure in tetragonal family","authors":"Xiangkang Peng,&nbsp;Fapeng Yu","doi":"10.1016/j.jre.2023.11.003","DOIUrl":"10.1016/j.jre.2023.11.003","url":null,"abstract":"<div><div>The new component of melilite type crystal CaNdAl₃O₇ (CNA) was grown by the Czochralski pulling method. Single crystal structure analysis was conducted. It is found that the CNA crystal belongs to the tetragonal system with <em>P</em>-42₁<em>m</em> space group. The cell parameters <em>a</em> = <em>b</em> = 0.77461 nm and <em>c</em> = 0.51089 nm. The density and Mohs hardness of CNA crystal are 4.08 g/cm³ and 5.45, respectively. The specific heat of the crystal is 0.57–0.77 J/(g·K) in the temperature range of 30–300 °C. X-ray photoelectron spectroscopy (XPS) shows that the crystal has stable atomic valence states and chemical environment. The vibration state of polyhedra groups in the crystal was measured by Raman spectra, and the piezoelectric response was analyzed based on the calculated results for the polyhedra polarization dipole moments. The relative dielectric permittivity of the CNA crystal at room temperature was determined to be 11.80 and the electrical resistivity was measured to be on the order of 5 × 10⁶ Ω·cm at 800 °C.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 153-161"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135669522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Proton transport in unsintered BaCe0.8Y0.2O3–α for easily prepared electrochemical devices","authors":"Xi Wang,&nbsp;Yushi Ding,&nbsp;Ying Li,&nbsp;Gaopeng Zhou,&nbsp;Wenlong Huang","doi":"10.1016/j.jre.2024.01.002","DOIUrl":"10.1016/j.jre.2024.01.002","url":null,"abstract":"<div><div>BaCe_0.8Y_0.2O_{3–<em>α</em>} ceramics exhibit superior conductivity among related materials. However, the high-temperature sintering makes it difficult to prepare electrochemical devices with a BaCe_0.8Y_0.2O_{3–<em>α</em>} multilayer film, and very few studies have examined the conductivity and transport properties of unsintered BaCe_0.8Y_0.2O_{3–<em>α</em>}. In nominally dry conditions, the instability of this material in a water-containing atmosphere can be minimized, allowing the unsintered BaCe_0.8Y_0.2O_{3–<em>α</em>} to be applied in some particular test environment as a component of electrochemical devices. Hence, the conductivity of unsintered BaCe_0.8Y_0.2O_{3–<em>α</em>} in dry conditions was measured via AC impedance spectroscopy in the temperature range of 500–800 °C. The unsintered BaCe_0.8Y_0.2O_{3–<em>α</em>} exhibits high conductivity and hydration ability, as well as low proton activation energy. In addition, it shows high oxygen vacancy and low proton transport numbers at high temperature, limited by its grain boundaries. This work provides insights into the conductivity and proton transport of unsintered BaCe_0.8Y_0.2O_{3–<em>α</em>} and demonstrates its potential as a proton-conducting electrolyte.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 133-145"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139094994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characteristics of Na-A zeolite from coal fly ash and application for adsorption of cerium(III)","authors":"Amru Daulay ,&nbsp;Widi Astuti ,&nbsp;Slamet Sumardi ,&nbsp;Fika Rofiek Mufakhir ,&nbsp;Yayat Iman Supriyatna ,&nbsp;Tri Haryono ,&nbsp;Lukmanul Hakim Samada","doi":"10.1016/j.jre.2024.01.007","DOIUrl":"10.1016/j.jre.2024.01.007","url":null,"abstract":"<div><div>Recycling rare earth elements (REEs) from waste is necessary for an environmentally sustainable reuse and wastewater management approach. Na-A zeolite was synthesized from coal fly ash (CFA) and applied for Ce³⁺ adsorption. Fourier transform infrared (FTIR) spectra show peaks at 790, 500 and 467 cm⁻¹, which are bond vibrations of Si–O–Si, Si with Al–O and Si–O–. The surface area is 15.88 m²/g, with a pore size of 2.14 nm. SEM images show a cubic shape, which indicates the formation of zeolite. Field emission and energy disperse spectroscopy (EDS) shows the formation of Si, Al, Na, and O. Na-A zeolite was applied for Ce³⁺ adsorption. The optimum conditions for Ce³⁺ adsorption are 50 ppm concentration, 360 min, and pH 6. The maximum adsorption capacity is 176.49 mg/g. Based on the results, it is found that the adsorption of Ce³⁺ by Na-A zeolite is pseudo-second-order. The desorption test using HNO₃ is more effective than using HCl and H₂SO₄. A desorption efficiency of 97.22% is obtained at 4 cycles. Adsorption test using real sample wastewater demonstrates an adsorption efficiency of 83.35%.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 1","pages":"Pages 171-179"},"PeriodicalIF":5.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139460160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure–performance relationship between denitration performance and catalytic interface morphologies of MnCeOx/P84 catalytic filters","authors":"Bo Yang,&nbsp;Yujie Lei,&nbsp;Maosen Ni,&nbsp;Liuying Wang,&nbsp;Qiong Huang,&nbsp;Mindong Chen","doi":"10.1016/j.jre.2024.12.021","DOIUrl":"10.1016/j.jre.2024.12.021","url":null,"abstract":"<div><div>MnCeO_<em>x</em>/P84 catalytic filters with spherical, flower-like, cubic and rod-like catalytic interfaces were synthesized respectively, and their catalytic activities in the NH₃-SCR reaction were investigated. The MnCeO_<em>x</em>/P84 catalytic filter with spherical catalytic interfaces (recorded as S-MnCeO_<em>x</em>/P84) exhibits the best catalytic denitration performance. The NO_<em>x</em> removal efficiency of S-MnCeO_<em>x</em>/P84 reaches the highest value of 98.6% at 160 °C when the catalyst loading is 100 g/m². At the same time, S-MnCeO_<em>x</em>/P84 exhibits good SO₂ resistance and stability, achieving a NO_<em>x</em> removal rate of 83% at 190 °C with 30 ppm SO₂. The characterization results illustrate that the MnCeO_<em>x</em> active component in S-MnCeO_<em>x</em>/P84 is present in weak crystalline states, tightly wrapped around the surface of the filter fiber, and uniformly dispersed, and the mesopore is the main pore structure of the S-MnCeO_<em>x</em>/P84, which can provide a channel for the catalytic reaction to proceed. At the same time, transmission electron microscopy (TEM) characterization shows that γ-MnO₂ is the main form of MnO₂ in the S-MnCeO_<em>x</em>/P84. Further analysis of H₂ temperature programmed reduction (H₂-TPR), NH₃ temperature programmed desorption (NH₃-TPD) and <em>in-situ</em> diffuse reflectance infrared spectra (DRIFTS) show that S-MnCeO_<em>x</em>/P84 has good redox ability at 100–200 °C and has abundant Lewis acid sites and Brønsteds acid sites, which provides an important guarantee for its superior low-temperature NH₃-SCR denitration performance.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 3","pages":"Pages 516-525"},"PeriodicalIF":5.2,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}