CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xianghao Meng,Sibo Kang,Zhihua Zhao,Guixin Jin,Zhigang Shao,Lan Wu
Bi 2 O 3 microspheres modified with CeO 2 were successfully synthesized via the hydrothermal method, and a gas sensor based on this composite material was prepared. Various analytical techniques were employed to examine the morphological and structural characteristics of the Bi 2 O 3 /CeO 2 composites. The synthesized Bi 2 O 3 microspheres exhibited a uniform size, with a particle diameter of approximately 2.5 μm. CeO 2 nanoparticles could be clearly observed on the surface of the Bi 2 O 3 microspheres. The results of X-ray photoelectron spectroscopy revealed that the adsorbed oxygen and oxygen vacancies on Bi 2 O 3 doped with CeO 2 increased, potentially due to the presence of Ce 3+ /Ce 4+ ions. The Bi 2 O 3 /CeO 2 sensors demonstrated significantly enhanced sensing properties for formaldehyde at room temperature. At a formaldehyde concentration of 100 ppm, the reactivity of the Bi 2 O 3 /CeO 2 sensor was 137 %, exhibiting a 6.6-fold enhancement compared to the Bi 2 O 3 sensor. Furthermore, the adsorption energy, differential charge density, and state density of the sample were calculated using density functional theory (DFT). Subsequently, the gas-sensing mechanism was analyzed and discussed. The results indicate that CeO 2 -modified Bi 2 O 3 nanospheres can enhance the adsorption energy of formaldehyde. The formation of a heterojunction facilitates electron transfer, thereby improving the gas-sensing properties. Furthermore, the gas sensing mechanism was discussed and analyzed using density functional theory (DFT) calculations.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jie Yao,Chengyi Li,Jianxin Feng,Bei Wei,Rongrong Xing,Shurong Ban,Li Tang,Bin Liu
Nanozymes with high peroxide (POD)-like activity have great practical potential in the colorimetric sensing of biomolecules in the medical and biological fields. However, their applications are limited by some disadvantages such as their low catalytic activity and poor biocompatibility. While designing and synthesizing nanozymes, elemental doping is used as an effective method to improve their enzymatic activity. Herein, CeO2 nanorods doped with different concentrations of Mn were synthesized via the hydrothermal method. Mn doping effectively improved the POD-like activity of the CeO2 nanorods. Notably, MnCe0.1 exhibited superior POD-like activity to that of CeO2. The improvement in the catalytic activity of MnCe0.1 was attributed to the presence of more exposed active sites and more oxygen vacancies compared with those of CeO2 nanorods. Using its excellent POD-like activity, the developed system exhibited linear detection ranges of 10–100 μM and 2.5–20 μM and detection limits of 1.94 μM and 0.37 μM for H2O2 and glutathione detection, respectively. Additionally, the developed MnCeX nanomaterials exhibit remarkable temporal stability and reusability. Finally, considering the excellent POD-like activity of MnCe0.1 nanozymes, they have good prospects for cancer treatment.
研究领域:
生物医学工程
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材料科学与工程
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产品关联
DOI
高影响因子
RARE METALS
·
2017
·Vol. 37
·期 2
·148-153
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IF 1.189
Jin Hui,Wang Yi-Yong,Wang Yu-Ting,Yang Hong-Bing
Current machinery requires metallic materials to have better surface properties. Based on an orthogonal experimental design and analysis method, the CeO 2 -reinforced nickel nano-composite coatings were prepared by direct current electrodeposition in a nickel sulfate bath containing CeO 2 nanoparticles. Statistical results indicate that current density is the most significant variable in the electrodeposition processing, while temperature is the least important factor. The microstructure of Ni and Ni–CeO 2 nano-composite coatings was characterized by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The microhardness of the Ni coating is enhanced by the incorporation of CeO 2 nanoparticles. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the corrosion behavior of Ni and Ni–CeO 2 coatings. These studies show that Ni–CeO 2 coating has better corrosion resistance compared to Ni coating.
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
RSC Advances
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2016
·Vol. 6
·期 76
·72015-72021
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IF 3.289
Fang Jiang,Haitao Zhao,Huan Chen,Chenmin Xu,Jian Chen
CeO2-doped indium oxide photocatalysts (xCeO2/In2O3) with various CeO2 doping amounts were synthesized and systematically characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis spectra, photoluminescence spectroscopy (PL) and photocurrent measurements. The as-obtained xCeO2/In2O3 photocatalysts were used in photocatalytic degradation of PFOA for the first time and much higher photocatalytic activity of xCeO2/In2O3 than CeO2 and In2O3 was obtained under UV light irradiation. The excellent photocatalytic activity of 0.86% CeO2/In2O3 could be mainly derived from effective inhibition of recombination of photo-induced electron-holes caused by the charge transfer between CeO2 and In2O3. Moreover, the 0.86% CeO2/In2O3 catalyst showed excellent photocatalytic stability in cycling runs for the photocatalytic degradation of PFOA, providing a great potential of CeO2/In2O3 catalysts for PFOA treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 6
·606
·
IF 4.501
Yadong Wang,Qing Hu,Ximing Wang,Yanpeng Huang,Yuanhao Wang,Fenghuan Wang
Methane reforming with carbon dioxide (DRM) is one promising way to achieve carbon neutrality and convert methane to syngas for high-value chemical production. Catalyst development with better performance is the key to its potential large-scale industrial application due to its deactivation caused by carbon deposition and metal sintering. Hence, a Ni/CeO2catalyst (Ni/CeO2-M) with higher CO2conversion and better stability is prepared, supported on CeO2precipitated via a novel microimpinging stream reactor. A series of ex-situ or in-situ characterizations, such as CO titration measurements, two-step transient surface reaction (two-step TSR), CO2and CH4temperature-programmed surface reaction (CO2-TPSR and CH4-TPSR), X-ray absorption fine structure (XAFS), and in-situ Raman spectroscopy study, were used to investigate its structure and mechanism. In contrast to Ni supported on commercial CeO2(Ni/CeO2-C), the Ni/CeO2-M catalyst with stronger lattice oxygen mobility and higher oxygen storage capacity enhances its CO2activation ability and carbon deposition. The Ni particle size of the Ni/CeO2-M catalyst decreased, and a higher oxidation state was obtained due to the strong metal–support interaction. Besides the reaction performance improvement of the Ni/CeO2-M catalyst, the novel microimpinging stream reactor could achieve catalyst continuous production with a high preparation efficiency. This work provides a novel method for the high-performance catalyst preparation for DRM reaction and its mechanism study gives a deep insight into high-performance catalyst development via bottom-up study.Keywords:dry reforming of methane;oxygen vacancy;Ni/CeO2catalyst
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
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Yihu Dai,Xiaofang Chu,Jingjing Gu,Xing Gao,Min Xu,Di Lu,Xiaoyue Wan,Wei Qi,Bingsen Zhang,Yanhui Yang
The CeO 2 -supported ternary RuSnB catalysts were synthesized by incipient wetness impregnation procedures and applied in hydrogenation of cinnamaldehyde in pure water as the solvent. A synergy effect between Ru-based catalysts and water molecules has afforded the efficiently selective transformation of cinnamaldehyde to cinnamyl alcohol with the satisfactory conversion and selectivity. Structural characterization results suggested the incorporation of Ru sites into the SnO x matrix and the electronic interaction between Ru and B additives in RuSnB/CeO 2 catalyst. The isotopic exchange studies have demonstrated that both dissociative activation of H 2 and H 2 O (deuterated D 2 and D 2 O) were apparently affected by the status of Ru sites. Furthermore, the kinetics tests in D 2 O solvent have also revealed the co-existence of water-involved hydrogen-exchange route with the direct hydrogenation route using dissociative H 2 during the hydrogenation reaction. The optimal Ru 2 Sn 1 B 1 /CeO 2 catalyst could afford the best H 2 O-activation capability and thus accelerate the reaction rate in the H 2 O-involved hydrogenation.
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
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IF 4.7
Bin Zhang,Shuo Liu,Hao Deng,Ye Pei,Qingxue Mu,Yuming Lei,Taolei Sun,Guanbin Gao
Plasmonic metal and semiconductor heterostructures have recently emerged as a promising strategy to enhance the rate of catalyzed reactions. However, most research has predominantly focused on plasmon-induced hot electron transfer mediated by localized surface plasmon resonance (LSPR), while the photothermal effects of plasmonic metals have been largely underexplored. In this study, a dumbbell-shaped Au nanobipyramids (AuNBPs)/CeO2 heterojunction with superior photothermal properties was designed as a catalytic platform for the hydrolysis of organophosphorus compounds and the reduction of 4-nitrophenol (p-NP). The results demonstrated that the photothermal effect at the interface between AuNBPs and CeO2 is the dominant mechanism accelerating the reaction. Moreover, for the hydrolysis product p-NP, AuNBPs@CeO2 further converted it into 4-aminophenol (p-AP) in the presence of NaBH4, effectively preventing secondary pollution. In summary, the integration of AuNBPs with photothermal properties and CeO2 successfully achieved cascade catalytic degradation of organophosphates.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Jiajun Dai,Yunlong Guo,Luhang Xu,Guilin Zhuang,Yi Zheng,Daohua Sun,Jiale Huang,Qingbiao Li
Bovine serum albumin (BSA)-templated CeO 2 was prepared by citrate sol-gel method and used as a support to synthesize Au catalyst for benzene oxidation. It was found that the Au/BSA-CeO 2 with 3.2 nm Au nanoparticles (NPs) gave rise to superior catalytic performance for benzene oxidation in which the temperature for 90 % benzene conversion was only 210 °C. In addition, the catalytic activity of Au/BSA-CeO 2 remained stable for 140 h of on-stream reaction. Besides, density functional theory calculation demonstrated how the porous structure of CeO 2 influenced the oxygen vacancy generation, and the synergetic effects of Au NPs and CeO 2 support facilitated the activation of benzene which was adsorbed on Au NPs prior to benzene oxidation. The catalysis of benzene oxidation over Au/CeO 2 catalyst follows the dual-site mechanism. BAS-templated CeO 2 support possessed hierarchical structure, abundant adsorbed oxygen species and synergic interaction with Au that determined the performance of Au/BSA-CeO 2 .
研究领域:
催化化学
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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
高影响因子
ACS Catalysis
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2022
·
IF 13.7
Xiao-Chen Sun,Kun Yuan,Wang-De Hua,Zi-Rui Gao,Qian Zhang,Chen-Yue Yuan,Hai-Chao Liu,Ya-Wen Zhang
The metal–support interface plays a crucial role in heterogeneous catalysis. The modulation of the metal–support interaction (MSI) affords the possibility of promoting the catalytic efficiency per active site. Here, we report a strategy to modulate the interfacial interaction and then optimize the interfacial activity of Co/CeO2 catalysts for the water–gas shift reaction (WGSR) by a facile NH3 treatment process for the CeO2 support. The sample of Co/800N-CeO2 treated at 800 °C exhibited the highest reaction rate of 260 μmolCO/(gCo s), which was 23.8 times higher than the rate of the untreated Co/CeO2 sample. A combination of ex situ and in situ characterizations suggested that addition of the NH3 treatment process did not only weaken the metal–support interaction between the Co species and CeO2 support to strengthen CO adsorption and CO activation ability but also induced oxygen vacancy generation under reaction conditions to accelerate H2O activation. Both worked together in promoting the catalytic efficiency for the WGSR via the carboxyl pathway at a low temperature. It was worth mentioning that the N species of the CeO2 support introduced by the NH3 treatment was removed after changing the catalyst structure under reaction conditions. The interfacial structure was robust in a 60 h test at 400 °C due to the coexistence mechanism of carboxyl and formate pathways avoiding the poisoning effect of formate species on the active sites. The construction of active interfaces could be extended to Fe/CeO2 and Ni/CeO2 catalysts and could bring great promise in the design of the interfacial structure of supported catalysts in wide applications including chemical transformation reactions and industrial catalysis.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Zongze Lv,Jiaqi Ruan,Weifeng Tu,Xun Hu,Donglin He,Xin Huang,Changlei Qin
Integrated carbon capture and utilization by methanation (ICCU-methanation) is an emerging concept in reducing CO 2 emissions and storing H 2 simultaneously. One key of the technology is the development of dual functional materials (DFMs) that can efficiently capture CO 2 and then catalyze it. Herein, we propose the construction of DFM using Li 4 SiO 4 with superior CO 2 adsorption/desorption features as sorbent and catalyst carrier, CeO 2 as catalyst promoter and isolator, and Ni as catalytic metal, and comprehensively evaluate its characteristics and performance in ICCU-methanation. Results show that the DFM developed possess a high and stable CO 2 capacity of 5.4 mmol·g DFM -1 , 96 % CO 2 conversion and 96 % CH 4 selectivity under both the ideal CO 2 capturing atmosphere and the realistic flue gas containing 10 vol% steam and 8 vol% O 2 . Moreover, rapid CO 2 dissociation from the DFM is observed at a temperature lower to 560 °C due to the reaction of H* dissociated by catalyst with carbonate to form formate, which further decomposes to release CO.
研究领域:
能源化学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Junzi Huang,Mengjie Lu,Peng Wei,Yahong Xie,Huihui Xie,Min Liu,Liang Li,Jindou Hu,Zhiwei Zhang,Ying Qi
Organic pollutants pose a great threat to human health due to the bioaccumulation, toxicity, carcinogenicity and mutagenicity. However, it is not easily degraded because of the stable properties. Therefore, the current challenge is to degrade organic pollutants efficiently with low-energy consumption. In this study, a Z-type heterojunction material CeO 2 /ZnO was constructed by hydrothermal and wet chemistry methods, and the photocatalytic degradation performance was studied using tetracycline (TC) as a model organic pollutant. It was showed that the 40% CeO 2 /ZnO composite material has excellent activity, capable of degrading 95.9% of TC in 75 min, and has good resistance to common interference ion. The results demonstrated that the 3D nanoflower of the composite material provided a large specific surface area for photocatalytic reaction, significantly improving the catalytic active sites. And the CeO 2 /ZnO could effectively reduce the recombination rate of photogenerated holes and electrons and effectively broadened the visible light absorption range, expanding the application range of the heterojunction and improving the utilization efficiency of the solar energy. What is more, the prepared heterojunction had outstanding photocatalytic activity in actual water samples. It can be used to degrade refractory organic pollutants, such as ciprofloxacin, methylene blue, rhodamine B, etc.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Rui Tang,Niamat Ullah,Yajun Hui,Xin Li,Zhenhua Li
Carbon dioxide hydrogenation for value-added chemicals has been regarded as a promising way for CO 2 utilization. This paper describes the preparation of Ni/CeO 2 catalysts derived from Ce-MOF precursor by impregnation or one-pot method and their application in carbon dioxide methanation. Various techniques were employed to characterize the prepared catalysts, including N 2 adsorption–desorption, X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (SEM), H 2 -temperature programmed reduction (H 2 -TPR), H 2 -temperature programmed desorption (H 2 -TPD) and CO 2 -temperature programmed desorption (CO 2 -TPD). The results showed that compared with commercial CeO 2 and CeO 2 prepared by precipitation, CeO 2 derived from Ce-MOF exhibited more oxygen vacancies and lower temperature reducibility, making it more beneficial for the adsorption and activation of CO 2 . Consequently, nickel supported on rod-shaped CeO 2 derived from Ce-MOF exhibited higher CO 2 conversion and methane selectivity at low temperatures. Furthermore, the Ni/CeO 2 −M-1 catalysts prepared by one-pot method showed superior activity since nickel could be partially incorporated into ceria lattice, leading to the formation of Ce 1-x Ni x O 2-y solid solutions and oxygen vacancies. The effect of nickel loading on the properties of the catalysts by one-pot method was also investigated, and the optimum Ni loading was 15 wt.% owing to the maximum number of oxygen vacancies being reached.
研究领域:
催化化学
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环境科学
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材料科学
✓ 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）