Arabian Journal of Chemistry
·
2020
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IF 4.762
Yue Li,Yuxuan Ma,Yuanyuan Zhang,Xiaojing Wang,Fenghua Bai
The selectivity and reactivity to converse series nitroaromatic into aminobenzenes are especially significant, which play a vital role in synthesizing required drugs or other fine chemicals. Herein, p-nitrophenol (p-NP) has been completely conversed into p-anomiphenol (p-AP) with a high activity factor k (0.033 s −1 ·mg −1 ) and reusability by core-shell Cu 2 O@CeO 2 catalyst. N-acetyl-para-aminophenol (paracetamal, APAP) as a model drug was further synthesized via a flow route proceeded in two steps including p-NP reduction and subsequently p-AP acylation with self-constructing device. The yield of the paracetamal is up to 85% with a highly purity. The mechanism investigation justifies the rich-electron centers and cation defects generated from the redox coupled Cu + →Cu 0 with Ce 3+ →Ce 4+ will steer selective conversion of p-NP to p-AP, a rate-determining step in the production of APAP. The present results could visualize a highly selective catalyst and a new synthesis route for pharmaceuticals such as paracetamal by using nitroaromatic compounds as the raw materials with environment-friendly, low-cost, easy-manipulation, high-efficiency and high purity.
研究领域:
催化
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药物化学
·
有机合成
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Shuxin You,Shilong Xing,Chuanhai Jiang
The synergistic mechanism of microparticles and nanoparticles on optimizing microstructures homogeneity and enhancing microhardness and corrosion resistance of mixed coatings was deeply researched by co-electrodepositing CeO 2 microparticles and CeO 2 nanoparticles into nickel matrix. Microparticles contribute to enhancing the microhardness of the coating, while nanoparticles promote the homogeneity of the microstructure, thereby improving the corrosion resistance of the coating. Therefore, by co-electrodepositing microparticles and nanoparticles into the nickel matrix, microparticles and nanoparticles in the nickel matrix generate a synergistic optimization effect, combining the advantages of microparticles and nanoparticles. Microparticles are mainly responsible for enhancing the microhardness of the coating, while nanoparticles are responsible for promoting the homogeneity of the microstructure in the coating, maintaining a homogeneous distribution of microhardness, and improving the corrosion resistance of the coating. Ultimately, the mixed coating achieves both high microhardness and excellent corrosion resistance, along with homogeneous microhardness distribution.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Zhongwei Fu,Yunyun Zhong,Yuehong Yu,Lizhen Long,Min Xiao,Dongmei Han,Shuanjin Wang,Yuezhong Meng
A new class of TiO2-doped CeO2 nanorods was synthesized via a modified hydrothermal method, and these nanorods were first used as catalysts for the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH in a fixed-bed reactor. The micromorphologies and physical–chemical properties of nanorods were characterized by transmission electron microscopy, X-ray diffraction, N2 adsorption, inductively coupled plasma atomic emission spectrometry, X-ray photoelectron spectroscopy, and temperature-programmed desorption of ammonia and carbon dioxide (NH3-TPD and CO2-TPD). The effects of the TiO2 doping ratio on the catalytic performances were fully investigated. By doping TiO2, the surface acid–base sites of CeO2 nanorods can be obviously promoted and the catalytic activity can be raised evidently. Ti0.04Ce0.96O2 nanorod catalysts exhibited remarkably high activity with a methanol conversion of 5.38% with DMC selectivity of 83.1%. Furthermore, kinetic and mechanistic investigations based on the initial rate method were conducted. Over the Ti0.04Ce0.96O2 nanorod catalyst, the apparent activation energy of the reaction was 46.3 kJ/mol. The reaction rate law was determined to be of positive first-order to the CO2 concentration and the catalyst loading amount. These results were practically identical with the prediction of the Langmuir–Hinshelwood mechanism in which the steps of CO2 adsorption and activation are considered as rate-determining steps.
研究领域:
催化
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化学工程
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材料科学
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环境化学
✓ 已验证
DOI
PubMed
ADVANCED COMPOSITE MATERIALS
·
2025
·
IF 2.3
Zhiwei Cai,Jing Sun,Ning Jiang,Chao Chen,Yanzi Lin,Yimin Shen,Minmin Ge,Guanglin Fang,Corinne Boudon,Yaokang Lv,Laurent Ruhlmann
Novel Ce/TiO2 were synthesized using a solution-based method involving two types of Ce(III)-doped polyoxotitanium cages, namely ([Ti28O38(OEt)38CeCl(EtOH)1.4] and [Ti8O7(OEt)21Ce(EtOH)]). This novel material was used to coat the surface of polyvinylidene chloride (PVDC)/polyvinyl chloride (PVC) film, resulting in a homogeneous CeO2/TiO2@PVDC/PVC film. Remarkably, the CeO2/TiO2@PVDC/PVC film exhibited notable hydrophobicity and UV absorption capacity. Furthermore, the UV absorption capacity of the films was significantly improved with increasing CeO2/TiO2 content. The incorporation of CeO2/TiO2 also led to a substantial improvement in the barrier properties of the film, particularly in terms of water vapor permeability. These modified films hold great potential and offer a wide range of applications in the pharmaceutical packaging and food packaging industries.
研究领域:
材料科学
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纳米技术
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高分子科学
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包装工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Jin Li,Wei Zhang,Xiujing Xing,Yaokang Lv,Renliang Lyu,Wei Xiong,Hao Li
Gold nanoparticles are extensively employed in the field of electrocatalytic nitrite reduction for ammonia synthesis, due to their exceptional conductivity and remarkable stability. However, the performance of a single metal is often limited and by combining different metals, the overall performance can be significantly improved to meet specific needs and application scenarios. The regulation of the interaction between loaded gold nanoparticles and metal oxide support materials represents an effective strategy for facilitating the reduction of nitrite to ammonia. In this work, we prepared three different structural morphologies of cerium dioxide (CeO2) – cubic (c-CeO2), rod-like (r-CeO2) and granular (p-CeO2), by modulating the hydrothermal temperature. The effect of the morphology of the CeO2 carriers on the surface structure of the composite catalyst, CeO2@Au, was systematically studied and its performance of the electrocatalytic reduction of ammonia from nitrite was explored. It was found that c-CeO2 loaded with Au nanoparticles possessed better electrocatalytic performance with an ammonia yield of 4007.9 μg h−1 mgcat−1 and a Faraday efficiency of 91.2% compared to r-CeO2 and p-CeO2. The results of the characterisation tests, conducted using scanning electron microscopy (SEM), elemental mapping analysis (EDS) and inductively coupled plasma (ICP), demonstrate that c-CeO2 exhibits enhanced crystallinity, a reduced particle size and a more uniform dispersion. Therefore, c-CeO2 is able to load more Au nanoparticles during the complexation process with Au, which in turn possesses more reactive active sites. In addition, the results of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) showed that after the complexation of c-CeO2 with Au, some of the lattice fringes of c-CeO2 were distorted with defects leading to an increase in the content of oxygen vacancies, which greatly improved the active area of the catalyst. These physicochemical properties endow the c-CeO2@Au catalysts with excellent electrocatalytic nitrite-to-ammonia activity.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·748
·
IF 4.3
Chen Yang,Jingjing He,Siying Chen,Qiuping Li,Xuexia Lin
In this study, silver-decorated cerium oxide (Ag@CeO2) nanoparticles were synthesized through a simple mixing and pyrolysis process to enhance their antioxidant and antitumor properties. The synthesis methods for Ag@CeO2were optimized, resulting in nanoparticles with varying antioxidant activities. Notably, the embedding of Ag nanoparticles within CeO2during pyrolysis significantly improved the antioxidant activity and stability of the nanoparticles, leading to enhanced antitumor effects. The Ag@CeO2nanoparticles exhibited strong cytotoxicity against tumor cells (MCF-7) while maintaining low toxicity toward normal cells (HUVECs). These properties, combined with their ability to modulate mitochondrial membrane potential, position Ag@CeO2as a promising candidate for electrochemical therapy (ECT). This study highlights the antioxidant potential and the potential of Ag@CeO2nanoparticles in tumor treatment and provides new insights into the application of nanomaterials in ECT.
研究领域:
纳米材料
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肿瘤学
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生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2016
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IF 7.354
Shuang Liu,Xiaodong Wu,Wei Liu,Wenming Chen,Rui Ran,Min Li,Duan Weng
Three model ceria catalysts, which are monocrystalline CeO 2 nanocubes, polycrystalline CeO 2 nanoparticles, and polycrystalline CeO 2 spindles, were synthesized and analyzed with isothermal soot oxidation, H 2 -TPR, and Raman spectroscopy. The results suggest that the initial activity of the catalyst is determined by the number of catalyst–soot contact points rather than the catalyst surface area, while the catalyst stability is closely related to the concentration of surface oxygen vacancies . Excessive surface oxygen vacancies may inhibit the regeneration of highly active O 2 − and lead to catalyst deactivation during reaction. After impregnation with Ag, O − can be readily regenerated and transformed to O 2 − , resulting in a 10-fold increase in soot oxidation activity over Ag/CeO 2 . Among these catalysts, Ag supported on nanocubic CeO 2 exhibits good availability of O 2 − and therefore high catalytic activity and stability, and is thus considered a promising catalyst for application in gasoline particulate filters.
研究领域:
催化化学
·
环境科学
·
材料化学
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能源工程
·
大气污染控制
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8
Chongzheng Zhu,Deqi Li,Henglong Zhang,Dongmei Zhang,Ningyi Su,Fu Xu
This study investigated the effect of montmorillonite-loaded cerium oxide (CeO₂) nanocomposites with different CeO 2 contents on the thermal-oxidative and ultraviolet (UV) aging properties of asphalt. Nanocomposites were synthesized using a sol-gel method, varying the CeO₂ content in montmorillonite (MMT), and then these nanocomposites were incorporated into 70# base asphalt at different contents. The micro-characteristics of nanocomposites were evaluated through a series of characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectrophotometry, and field emission scanning microscope (FE-SEM). The impact of the nanocomposites on the thermal-oxidative and UV aging resistance of asphalt were assessed by measuring changes in softening point, ductility, penetration, and carbonyl index (CI) before and after aging. The results demonstrated that the CeO₂ content significantly influenced the nanocomposite structure, affecting its dispersion, interlayer spacing, and UV absorption properties. At the same time, CeO₂ significantly improved the UV shielding properties of CM, with an optimal CeO₂ to MMT ratio found to enhance the aging resistance of asphalt. This was attributed to the synergistic effect of the oxygen storage and UV absorption capabilities of CeO₂, combined with the thermal insulation and oxygen isolation properties of MMT. Additionally, the application of the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) method identified 1 % CMMA0.5 as the optimal modifier for improving the resistance of asphalt to thermal and UV aging.
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2016
·
IF 2.38
Jiang Tan,Yuchang Su,Te Hu,Qiushan Yu,Rabigul Tursun,Quan Li,Yunze Xi
The cubic 10Sc1CeSZ (10 mol% Sc 2 O 3 –1 mol% CeO 2 –89 mol% ZrO 2 ) was prepared by controlling the concentration of the urea varied from 0.4 to 0.6 mol/L in the hydrothermal process. XRD results depict that the 10Sc1CeSZ blocks have a stable cubic phase structure at room temperature after sintering at 1150–1450 °C. SEM characterization of the fracture surface of the 10Sc1CeSZ blocks shows that the grain size increases from 0.3 to 8 μm during heat treatment up to 1150–1450 °C, correspondingly, the relative densities increase from 98.3% to 99.7%. The impedance spectra measured at 300 °C reveal that the grain boundary resistance reduces with the increase of sintering temperature . Impedance analysis results show that the 10Sc1CeSZ block sintered at 1450 °C for 4 h has the highest total ionic conductivity of 0.137 S cm − 1 at 800 °C.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2024
·Vol. 78
·期 13
·7573-7581
·
IF 2.1
Xu Xianglan,Qian Zijian,Wang Dongxue,Liu Fang,Zhu Jia,Fang Xiuzhong,Xu Junwei,Wang Xiang
The rutile SnO 2 monolayer dispersion capacity on the rutile TiO 2 (r-TiO 2 ) was obviously higher than that on the anatase TiO 2 (a-TiO 2 ) via the qualification of the X-ray diffraction extrapolation method, presenting a like-disperses-like rule. Combined hydrogen temperature-programmed reduction and X-ray photoelectron spectroscopy results revealed that stronger interaction occurred between the supported SnO 2 and the r-TiO 2 than and the a-TiO 2 , thus resulting in higher SnO 2 dispersion on the r-TiO 2 . The SnO 2 /r-TiO 2 catalysts exhibited higher CO activity than the SnO 2 /a-TiO 2 catalysts with the same SnO 2 loadings, verified that the supported SnO 2 and the support sharing a crystalline phase is favorable to achieve the more active dispersed component. The CeO 2 monolayer dispersion capacities on cubic c-ZrO 2 and monoclinic m-ZrO 2 supports further confirmed the universality of the like-disperses-like rule for oxide–oxide systems independent on preparation methods. By comparing a series of oxide–oxide systems, the like-disperses-like rule involved not only the crystalline phase and lattice matching, but also M–O bond characteristics of two oxides. Graphical Abstract
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2025
·
IF 24.2
Zhao Sun,Kun Lei,Louise R. Smith,Nicholas F. Dummer,Richard J. Lewis,Haifeng Qi,Kieran J. Aggett,Stuart H. Taylor,Zhiqiang Sun,Graham J. Hutchings
Advanced oxygen carrier plays a pivotal role in various chemical looping processes, such as CO 2 splitting. However, oxygen carriers have been restricted by deactivation and inferior oxygen transferability at low temperatures. Herein, we design an Fe–O v –Ce–triggered phase-reversible CeO 2− x ·Fe·CaO ↔ CeO 2 ·Ca 2 Fe 2 O 5 oxygen carrier with strong electron-donating ability, which activates CO 2 at low temperatures and promotes oxygen transformation. Results reveal that the maximum CO 2 conversion and CO yield obtained with 50 mol% CeO 2− x ·Fe·CaO are, respectively, 426% and 53.6 times higher than those of Fe·CaO at 700°C. This unique multiphase material also retains exceptional redox durability, with no obvious deactivation after 100 splitting cycles. The addition of Ce promotes the formation of the Fe–O v –Ce structure, which acts as an activator, triggers CO 2 splitting, and lowers the energy barrier of C═O dissociation. The metallic Fe plays a role in consuming O 2− lattice transformed from Fe–O v –Ce, whereas CaO acts as a structure promoter that enables phase-reversible Fe 0 ↔ Fe 3+ looping.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wanli Sun,Xinlei Yang,Fan Yang,Hao Wang
Pure/undoped ceria materials have attracted lots of interests for semiconductor membrane fuel cells (SMFCs) operated at reduced temperature, among of them, commercialized CeO 2 in nano-scales exhibits an impressive transient electrical property with obvious high performance price ratio. Nevertheless, its excessive voltage attenuation rate and short circuit issues hinder the potential electrolyte application in low-temperature ceramic fuel cell. In this work, an innovative anion doping process is demonstrated to tune the commercialized CeO 2 to a durable fluorine-doped ceria electrolyte, which is beyond the cation structural doping strategy usually utilized in ceria-based materials. Assembled with symmetrical NCAL electrode, the CeO 2-y-δ F y electrolyte succeed in a superior fuel cell properties with high open circuit voltage (OCV) and improved power density of 427.8 mW cm −2 at 550 °C. More importantly, compared to pure CeO 2 electrolyte counterpart, the optimized fuel cell on fluorine-doped CeO 2 (CeO 2-y-δ F y ) electrolyte material exhibits a two-order reduction of attenuation rate of operative voltage at current density of 156 mA cm −2 . The effects of fluorine doping on the morphology and structure of CeO 2 and the electrochemical properties of semiconductor were proved by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis. Fluorine doping modification is believed as a universal strategy for ceria-based and other nano metal oxide semiconductor MOS electrolyte materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）