RADIATION PHYSICS AND CHEMISTRY
·
2021
·
IF 2.858
Meng Yan,Fen Luo,Xiaoyan Shu,Hexi Tang,Shunzhang Chen,Guilin Wei,Yi Xie,Lan Wang,Xirui Lu
As it is pivotal to study the self-irradiation of radioactive contaminated soil under alpha-particle in long term storage, the purpose of this paper is to research the irradiation behavior of 10–30 wt% of Nd 2 O 3 and CeO 2 co-doped glass samples under 0.5 MeV He 2+ irradiation of high fluences from 1.0 × 10 14 to 1.0 × 10 17 ions/cm 2 at room temperature. The results of GIXRD show that the main phases keep amorphous after irradiation. Surface morphology is still smooth and enrichment phenomenon of all the referred elements exist rarely after irradiation by SEM-EDS. Meanwhile, the results of Vickers hardness value and leaching rate test show slightly change whereas the structure of the glass-samples under alpha-particle irradiation are stable. Therefore, this work can offer detailed information for the radiation tolerance of the materials.
研究领域:
材料科学
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核废物管理
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Longyi Xue,Ninghan Wei,Cheng Zhao,Xiaomei Hu,Junge Yun,Zimo Chen,Zhiyi Deng,Zhihang Chen
CeO 2 as selective catalytic reduction (SCR) catalyst has attracted wide attention due to its abundant surface acidity and excellent oxygen storage/release capacity. However, its further implication was hindered owing to insufficient catalytic activity and SO 2 resistance. Novel Cr doped CeO x catalysts were synthesized by solid phase method and used for NH 3 -SCR of NO x at middle-low temperature. The effect of Cr addition on the SCR performance and physicochemical properties of CeO 2 catalyst was investigated by activity test and characterizations. Among the tested catalysts, Cr(0.4)-CeO x catalyst exhibited excellent NO x removal efficiency, with >90% NO conversion within 180–300 °C, 100% NO conversion at 220 °C and outstanding SO 2 resistance at 240 °C under 100 or 600 ppm SO 2 . The characterizations results revealed that Cr modified CrCeO x catalyst could effectively increase BET surface area, pore volume, surface acidity and redox capacity. In situ DRIFTS indicated that SCR reactions over Cr(0.4)-CeO x catalyst followed Eley-Rideal mechanism and active –NH 2 was the major intermediate species. After sulfuration, Cr(0.4)-CeO x still exhibited excellent SCR activity due to the increase of Cr 6+ , Ce 3+ and O α concentration and the formation of Cr–O–Ce bond, new Brønsted acid site and more crystallized Cr 2 O 3 .
研究领域:
催化化学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaofeng Ke,Feng Zhou,Yihuang Chen,Mei Zhao,Yun Yang,Huile Jin,Youqing Dong,Chao Zou,Xi'an Chen,Lijie Zhang,Shun Wang
Sluggish kinetics of hydrogen oxidation reaction (HOR) in alkaline solution has restricted the rapid development of hydrogen economy. Constructing catalyst with metal-oxide heterostructures can enhance HOR performance; however, little studies concentrate on charge transfer between them, and the corresponding effects on reactions remain unclear. Herein, we report charge-transfer-adjustable CeO 2 /Rh interfaces uniformly dispersed on multiwalled carbon nanotube (CNT), which exhibit excellent alkaline HOR performance. Results confirm that the charge transfer from Rh to CeO 2 could be conveniently tuned via thermal treatment. Consequently, the adsorption free energies of H* in Rh sites and OH* adsorption strength in CeO 2 could be adjusted, as corroborated by density functional theory study. The optimized CeO 2 /Rh interfaces exhibit an exchange current density and a mass-specific kinetic current of 0.53 mA cm PGM −2 and 830 A g PGM −1 at an overpotential of 50 mV, respectively, which surpasses most of the advanced noble-metal-based electrocatalysts. This work provides a new insight of harnessing charge transfer of heterostructure to enhance catalytic activities.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Weijie Zhang,Qinhai Huang,Siduo Song,Yuejia Song,Guanqing Wang,Xinyan Yan,Danqi Zhao,Qiyang Hong,Likun Ma,Zhishan Bai
Addressing the key issue of low SO 2 conversion efficiency in the treatment of waste acid from alkylation processes, this study employed a CeO 2 crystal plane engineering strategy to enhance the efficient conversion of SO 2 to SO 3 by modulating the interfacial structure of the V 2 O 5 /CeO 2 catalyst. Combining characterization techniques such as Raman spectroscopy, density functional theory calculations and diffuse reflectance infrared fourier transform spectroscopy, it was revealed that rod-shaped CeO 2 on the {110} crystal plane, due to enhanced interfacial electronic interaction induced by high concentrations of oxygen vacancies and optimal lattice oxygen mobility, promoted the formation of active monodentate sulphate intermediates at the molecular level whilst suppressing the deposition of inert species. The prepared V 2 O 5 /CeO 2 catalyst ({110} crystal plane) achieved an SO 3 yield of 779.5 μmol·g -1 ·h -1 at 350 °C, with a conversion rate of 88.2%, which was 1.51 times and 2.46 times higher than that of V 2 O 5 /CeO 2 ({100} crystal plane) and V 2 O 5 /CeO 2 ({111} crystal plane), respectively; moreover, the activity retention rate remained as high as 95.4% after a 12-hour stability test. This study provided clear structural design guidelines for high-performance SO 2 oxidation catalysts aimed at the high-value utilization of waste acids from alkylation processes.
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 7
·191
·
IF 2.5
Liu Yubing,Tang Jie,Cai Chenyu,Gu Runjing,Yang Xinyu,Yue Liang,Bai Yiqiang,Zhang Fengxiao,Liang Jing,Xu Naizhang,Fan Yining
CeO 2 -supported Au and Pd nanocatalyst (Au-Pd/CeO 2 ) was developed and used in the oxidation of 1,2-propanediol (1,2-PDO). Notably, by tuning catalyst composition and reaction conditions, the product selectivity could be well controlled to produce lactic acid (LA) majorly, which was one of the top twelve bio-based platform molecules with very broad application scopes. The catalyst with Pd/(Au + Pd) molar ratio at 0.25 should be the preferable catalyst was screened out to be preferable, affording LA in 92.0% selectivity, while 88.0% of 1,2-PDO was converted under mild reaction conditions (0.3 MPa of O 2 at 80 °C for 3 h). The superior catalytic activities of Au-Pd/CeO 2 probably attributed to the strong interactions between Au and Pd nano particles (NPs), as being reflected by High resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectra (XPS) characterizations. Moreover, strong interactions between Au and Pd NPs making it easy to generate active oxygen species. Superoxide radicals can oxide the first hydroxyl group of 1,2-PDO to carboxyl group, while H 2 O 2 can easy caused C-C bond breaks and generate unwanted by-products. Graphical The alternative text for this image may have been generated using AI.
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yi Liao,Shan-Shan Chai,Wei-Bin Zhang,Yao Yao,Jing-Lei Yang,Yi Yin,Jia-Jun Li,Ze-Qin Yang,Xue-Jing Ma,Qiang Peng
Clay minerals, naturally occurring two-dimensional layered nanomaterials, hold significant interest in electrochemical energy storage. However, their practical use is hindered by the pronounced stacking and aggregation of layers. Here, we selected eight clay minerals of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, sepiolite, talc and chlorite, employed a simple chemical water bath method to insert diamine molecules with different chain lengths between the layers of these minerals. This approach aimed to prevent stacking and aggregation while allowing controlled expansion of the layer spacing. Subsequently, the montmorillonite (M) with relatively high specific capacitance were selected for further discussion. X-ray diffraction results show that the layer spacings of diamine ( x DM, x = 2–6) modified montmorillonite (M/ x DM) could be optimized within 1.189 nm and 1.455 nm, of which the butanediamine (4DM) pillared montmorillonite composites (M/4DM) exhibited the most suitable layer spacing of 1.362 nm for efficient Na 2 SO 4 ion transportation. Additionally, the CeO 2 loaded montmorillonite (CeO 2 -M) composites were further prepared by the same method to obtain diamine pillared CeO 2 loaded montmorillonite (CeO 2 -M/ x DM). The specific capacitance of CeO 2 loaded and butanediamine pillared montmorillonite composites (CeO 2 -M/4DM) was 573.9 F g −1 , which was 33.9% higher than the counterpart without modification (CeO 2 -M). The assembled supercapacitor CeO 2 -M/4DM//AC exhibited almost no loss in capacitance after 10,000 cycles.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yanrui Hao,Hao Guo,Mingyue Wang,Liping Peng,Henglong Ren,Wu Yang
In this article, MOF-derived (NiCo)Se 2 -x-CeO 2 sphere-rod structure composite with mixed ligands (BPDC: biphenyl-4, 4′-dicarboxylic acid, PTA : terephthalic acid) is constructed via a two-step solvothermal technique. The carboxyl functional groups of BPDC act as nucleation modulation to inhibit transverse growth of MOF by enhancing steric hindrance , and two symmetric carboxyl groups and unsaturated metal nodes of adjacent layers generate the coordination, thus forming ordered nanostructures with relatively large aspect ratio. The structure produces larger pores to balance the opposite and different rate of diffusion for metal and nonmetallic ions in hydrothermal selenization. The construction of heterostructure by combining highly reactive (NiCo)Se 2 with low reactive CeO 2 improves diffusion kinetics. As-prepared (NiCo)Se 2 –3:7-CeO 2 derived from MOF-3:7-CeO 2 of largest aspect ratio generates large mesopore to achieve strong penetration of electrolyte ions and exhibits enhanced performance through synergistic interaction between all components on heterointerface. After testing, the (NiCo)Se 2 –3:7-CeO 2 (PTA:BPDC = 3:7) electrode shows superior specific capacitance of 2715 F g −1 (1222 mAh g −1 ) at 1 A g −1 . The assembled (NiCo)Se 2 –3:7-CeO 2 //AC HSC (hybrid supercapacitor) delivers energy density of 45.9 Wh kg −1 at power density of 747 W kg −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Song Hui,Sun Kai,Huang Hengming,Ning Shangbo,Wang Shengyao,Wang Zhuan,Weng Yuxiang,Cui Yi,Li Yifan,Wang Xu-sheng,Wang Defa,Liu Lequan,Wang Zhou-jun,Ye Jinhua
The direct photocatalytic oxidation of methane to value-added chemicals has garnered considerable interest in recent years. However, achieving high productivity while maintaining high selectivity at an appreciable methane conversion rate remains a formidable challenge. Here, we present photochemically-triggered and photothermally-enhanced oxidative coupling of methane to multi-carbon C 2+ alkanes over an Au and CeO 2 nanoparticle-decorated ZnO photocatalyst, which exhibits a record-breaking C 2+ production rate of 17,260 μmol g −1 h −1 with ~90% C 2+ selectivity under wide-spectrum light irradiation without a secondary source of heating. Comprehensive characterizations and computational studies reveal that CH 4 activation is a photochemical reaction initiated by ultraviolet light-excited ZnO, and the introduction of CeO 2 substantially enhances the activation of CH 4 and O 2 due to the cooperative interaction between Au and CeO 2 . Concurrently, Au nanoparticles capture visible and near-infrared light to generate localized heating, which greatly promotes the subsequent desorption of produced methyl radical for C–C coupling prior to undergoing further undesired overoxidation.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2019
·
IF 5.128
Jia Fang,Rong Shi,Zhongwei Meng,Yuan Jiang,Zihan Qin,Qian Zhang,Yuan Qin,Jie Tan,Weilian Bai
The interaction effect of catalyst and ash on commercial carbon black (Printex U, PU) oxidation is investigated using non-isothermal thermogravimetric analysis (TGA). The presence of commercial catalysts TiO 2 and CeO 2 decrease the start, peak and end temperatures of soot oxidation, and increase the comprehensive oxidation index. Compared with PU/TiO 2 mixture, PU/CeO 2 mixture has lower activation energy and higher comprehensive oxidation index because CeO 2 has the higher oxygen storage and better active oxygen generation capacities. The impact of CeO 2 is shown to be the most significant at 1:5 wt ratio between soot and catalyst among various ratios. Compared with pure PU, the comprehensive oxidation index for 1:5 wt ratio of PU/CeO 2 increases from 0.97*10 −7 % 2 min −2 °C −3 to 1.58*10 −7 % 2 min −2 °C −3 . The comprehensive oxidation index can further increase by adding ashes. Compared with PU/CeO 2 /Al 2 O 3 , PU/CeO 2 /MgO and PU/CeO 2 /CaSO 4 mixtures, PU/CeO 2 /ZnO mixture has the maximum comprehensive oxidation index. The most significant impact of potential ash on PU/CeO2 is observed with 1:5:5 wt ratio of PU/CeO 2 /ZnO among soot, catalyst and ash, which has the maximum comprehensive oxidation index 2.41*10 −7 % 2 min −2 °C −3 . The comprehensive oxidation index of 1:5:5 wt ratio of PU/CeO 2 /ZnO increases by 148% compared with pure PU. This work is beneficial to demonstrate the interaction mechanism of the catalyst and ash on soot oxidation process under O 2 /N 2 atmosphere.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Yiling Wan,Kuan Ding,Jason Chun-Ho Lam,Daoxu Zhong,Shu Zhang
Catalytic pyrolysis of biomass over CeO 2 to prepare ketonic chemicals is an important way to achieve carbon emission reduction, whereas the role of catalyst structure has long been overlooked. In this work, nano-CeO 2 with different crystal shapes, namely nanorods (R-CeO 2 ), nano-polyhedra (P-CeO 2 ), and nanocubes (C-CeO 2 ), were synthesized and then tested in catalytic ketonization of xylan . Results showed that among all the three catalysts, C-CeO 2 produced the highest yield of ketones . Characterization results revealed that C-CeO 2 presented the lowest content of oxygen vacancies while exhibiting the highest proportion of {100} facets, proving that the {100} facets made a greater contribution to the total yield of ketones . On the other hand, P-CeO 2 and R-CeO 2 displayed a better selectivity to linear ketones, which was beneficial to improving the product quality. The relative contents of {111} facets of these catalysts were higher than C-CeO 2 , demonstrating that the {111} facets could selectively produce linear ketones. The proposed mechanism indicated that P-CeO 2 and R-CeO 2 principally enhanced the ketonic deoxygenation reactions, while C-CeO 2 also promoted the recyclization reaction, producing more cyclic ketones . These findings disclose that the {111} facets of CeO 2 are more favorable to producing valuable linear ketones.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tianqi Zhang,Zhenfeng Guo,Yunguang Yin,Luyi Zhu,Guanghui Zhang,Yongshuai Xie,Benxue Liu,Kangkang Yuan,Xiaotong Jin,Xinqiang Wang
Precursors with good spinnability and stability are essential for the preparation of high-quality metal oxide nanofibers by electrospinning. In this work, guided by the concept of molecular precursor design, a cerium-based polymeric precursor, polyacetylacetonatocerium (PAC), was successfully developed by optimizing the ligand source, showing improved spinnability and stability compared with the acetate-derived precursor system (polyacetatocerium, PEC). By combining electrospinning with subsequent calcination, self-supporting CeO 2 nanofiber membranes were successfully fabricated. The PAC-derived precursor exhibited a higher ceramic residue yield and better morphology retention during calcination, and the resulting membranes showed better structural integrity. Among the obtained samples, the nanofiber membranes calcined at 600 °C (A6) showed the best overall mechanical performance, with a tensile strength of 0.78 MPa, together with good bending and folding tolerance. The CeO 2 nanofiber membranes also exhibited high near-infrared reflectance. In a 300 s butane-torch test, a 30 mm-thick stacked CeO 2 nanofiber membranes maintained a cold surface temperature of about 112 °C, while the hot surface response temperature was about 1308 °C, indicating its potential for thermal protection. These results demonstrate the feasibility of preparing CeO 2 nanofiber membranes via precursor-designed electrospinning and suggest their potential in thermal-protection-related applications.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Fang Dong,Yu Meng,Weitong Ling,Weigao Han,Weiliang Han,Xiaona Li,Zhicheng Tang
Development of low-cost noble Pt-based catalyst with superior catalytic performance is a challenge to achieve its application in VOCs catalytic oxidation. Although the single atom provides a strategy to design and develop highly efficient heterogeneous catalysts that simultaneously maximizes the utilization of precious metal atoms, the stability of single atom catalysts is not satisfactory as a result of its high atomic surface energy. Here we construct a Pt 1 @CeO 2 single atom catalyst (SAC) with excellent catalytic activity for benzene catalytic combustion (T 90 = 212 °C) and low precious metal Pt loading, and even displaying an outstanding thermal stability and water resistance under the harsh conditions of 30,000 mL/g/h and 2000 ppm benzene. This Pt 1 @CeO 2 catalyst was obtained by in situ domain limited encapsulation of Pt species in Ce-MOFs nanocages during the solvothermal reaction process. It is observed that lots of oxygen vacancies were created by the dislocation and phase transition of CeO 2 to provide abundant sites for anchoring single atomic Pt, which can be localized and anchored firmly to oxygen vacancies, thus forming the highly stable Pt single atom. The atomically dispersed Pt is capable of improving the catalytic activity by forming Pt-O band. The good water resistance may be ascribed to the confined Pt single atom into oxygen vacancies of CeO 2 support to form strong metal-support interaction (SMSI), and the PtO x nanoparticles would be easy to aggregate deactivation under water vapor conditions. It is a simple and universal strategy to prepare Pt SAC via the inherently confined space of MOFs nanocages formed by coordination of organic ligands and metal ions, which benefits from the functional modification of ethylene glycol in MOFs self-assembly reaction.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
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