ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng
A CuO–CeO2–TiO2 catalyst for selective catalytic reduction of NOx with NH3 (NH3-SCR) at low temperatures was prepared by a sol–gel method and characterized by X-ray diffraction, Brunner–Emmett–Teller surface area, ultraviolet–visible spectroscopy, H2 temperature-programmed reduction, scanning electron microscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The CuO–CeO2–TiO2 ternary oxide catalyst shows excellent NH3-SCR activity in a low-temperature range of 150–250 °C. Lewis acid sites generated from Cu2+ are the main active sites for ammonia activation at low temperature, which is crucial for low temperature NH3-SCR activity. The introduction of ceria results in increased reducibility of CuO species and strong interactions between CuO particles with the matrix. The interactions between copper, cerium and titanium oxides lead to high dispersion of metal oxides with increased active oxygen and enhanced catalyst acidity. Homogeneously mixed metal oxides facilitate the “fast SCR” reaction among Cu2+–NO, nitrate (coordinated on cerium sites) and ammonia (on titanium sites) on the CuO–CeO2–TiO2 catalyst at low temperatures.
研究领域:
环境催化
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材料化学
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表面科学
·
化学工程
·
大气污染控制
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xin Huang,Zijun Ran,Zhi He,Jingyu Ran
Mercury has a significant impact on environment and is mainly derived from coal-fired power plant. Herein, we report a potential route for efficient removal of Hg 0 via oxidation reactions using Ce-doped LaCoO 3 supported on CeO 2 catalyst. Catalyst characterization results proved that Ce can successfully substitute a desired part of Co into the LaCoO 3 crystal lattice via a sol–gel method. The Hg 0 removal experiments suggest that Hg 0 removal efficiency decreased in the order of La 0.875 Ce 0.125 CoO 3 /CeO 2 > La 0.875 Ce 0.125 CoO 3 > LaCoO 3 . The presence of O 2 provided more active oxygen and resulted in approaching 100% Hg 0 removal efficiency. Introducing H 2 O and sole SO 2 would significantly reduce the Hg 0 removal efficiency as a result of competitive adsorption on the actives sites of the catalyst. On the other hand, SO 2 could reacted with Hg 0 in the presence of O 2 and thereby recover the high Hg 0 removal efficiency and the La 0.875 Ce 0.125 CoO 3 /CeO 2 catalyst presented a good performance towards sulfur resistance. Furthermore, the catalyst still exhibited a high Hg 0 removal efficiency performance after five times consecutive recycles.
研究领域:
环境科学
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催化
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材料科学
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能源工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Tongtong Xia,Zuliang Wu,Ehao Gao,Jiali Zhu,Shuiliang Yao,Jing Li
n -Undecane (C11) is a typical alkane pollutant, accounting for 6 % of the total volatile organic compounds (VOCs) emitted from the printing industry in China. A dielectric barrier discharge (DBD) reactor coupled with a catalyst of abundant oxygen vacancies prepared by Au nanoparticles 100 % loading on CeO 2 was developed for the plasma catalytic degradation of C11. Compared with CeO 2 , CeO 2 /γ-Al 2 O 3 , Au/γ-Al 2 O 3 , and Au/CeO 2 /γ-Al 2 O 3 , Au/CeO 2 exhibited significantly higher C11 oxidation performance with 98.8 % C11 conversion and 97.9 % COx selectivity. The strong interaction between nanosized Au and CeO 2 enhanced the ratios of Ce 3+ /(Ce 3+ +Ce 4+ ) and Au + /(Au + +Au 0 ), resulting in the formation of abundant oxygen vacancies with the highest band gap energy, which facilitated C11 oxidation. In addition, the reservation of reactive oxygen species generated by gas discharges on Au/CeO 2 catalyst synergistically promoted C11 complete oxidation, thus improving the oxidation stability within 600 min with stable C11 conversion and COx selectivity. This work presents an effective strategy to regulate the performance of catalysts for VOCs oxidation, and demonstrates that the plasma catalytic degradation of VOCs is feasible.
研究领域:
环境科学
·
催化
·
等离子体化学
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yeping Liu,Fei Yang,Peng Liu,Congcong Lou,Liqin Zhu,Yanzhao Yang
The efficiency of conventional medicines in treating bacterial infections has significantly decreased as a result of antibiotic resistance, which has emerged as a serious global public health concern. Many restrictions apply to the current treatments for bacterial infections, which could result in more adverse effects and problems with resistance. Therefore, it is incredibly crucial to develop nanomaterials for phototherapeutic methods that are characterized by nonresistance and high efficiency. In this work, we designed and synthesized a nanoenzyme CeO2/FePPOP composite of a porphyrin-based porous organic polymer, FePPOP, and an inorganic material, CeO2, for multimodal antimicrobial activity. By subjecting CeO2/FePPOP to a single near-infrared (NIR) light, it is possible to catalyze the production of a significant amount of reactive oxygen species (ROS). This material also has excellent light-to-heat conversion efficiency, thereby inflicting dual damage on bacteria. CeO2/FePPOP combines its excellent peroxidase-like (POD-like) activity, photodynamic (PDT), and photothermal (PTT) properties. Therefore, it demonstrates effective broad-spectrum antimicrobial activity, killing 99.9% of Gram-negative Escherichia coli and 99.6% of Gram-positive Staphylococcus aureus. This study offers innovative insights into the creation of nanomaterial antimicrobial agents amenable to phototherapeutic interventions.
研究领域:
纳米技术
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材料科学
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生物医学工程
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ke Wang,Jiaqi Yang,Bo An,Qin Zhang,Dongxing Song,Yongqing Wang
This study utilizes the citric acid-EDTA combustion method to synthesize Gd 0.1 Ce 0.9-x Ge x O 1.95 (x = 0.005,0.01,0.04,0.07), marked as nGGDC (n = 0.5,1,4,7), and Gd 0.1 Ce 0.9 O 1.95 (10GDC) composite materials, focusing on electrochemical performance and mechanical properties. The prepared materials all form a cubic fluorite structure. Doping with Ge 4+ increased the densification of the electrolyte, enlarged the grain volume, and reduced the number of grain boundaries, thereby enhancing the dielectric constant. This improvement reduces intragranular resistance and grain boundary resistance, promoting the migration of oxygen ions . The Scavenging Ratio (SR) of Gd 0.1 Ce 0.89 Ge 0.01 O 1.95 (1GGDC) is the highest, reaching 4.1 at 975 K, and the Blocking Factor (∂ t ) of 1GGDC decreases by 52 % compared to 10GDC . 1GGDC exhibits the highest conductivity and the lowest activation energy , increasing by 424 % and decreasing by 20 % compared to 10GDC , respectively. In terms of mechanical properties, compared to 10GDC, 1GGDC samples exhibit improved hardness (10.85 GPa), fracture toughness (3.18 MPa m ½ ), and flexural strength (97.62 MPa). Electrolyte single cells containing 1GGDC demonstrate higher power density and current density, particularly at 1023 K (955 mW/cm 2 vs. 740 mW/cm 2 for 10GDC). According to density functional theory calculations, the oxygen vacancy formation energy, binding energy, and migration barrier of GGDC electrolyte co-doped with Ge and Gd are all lower than those of GDC. Therefore, 1GGDC can be considered as a potential intermediate-temperature solid oxide fuel cells (IT-SOFCs) electrolyte material.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 9
·1733-1738
·
IF 3.741
Wang Nan,Sun Jianchao,Chen Lijian,Fan Hai,Ai Shiyun
A nanomaterial of the chemical composition Cu 2 (OH) 3 Cl-CeO 2 and with a large surface area is shown to be a viable peroxidase mimetic. It was synthesized by co-precipitation of an aqueous solution containing Ce(III) chloride, Cu(II) chloride and hexamethylenetetramine by adding an ionic liquid. The material was characterized by scanning electron microscopy and X-ray powder diffractometry. The composite possesses peroxidase-like activity and catalyzes the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine by H 2 O 2 to produce a blue product. Based on this finding, a simple, rapid and selective colorimetric method was worked out for the determination of glucose and cholesterol by using the respective oxidases and by quantifying the H 2 O 2 formed. Both glucose and cholesterol can be determined by this method at levels as low as 50 µM.
We found that the newly synthesized Cu 2 (OH) 3 Cl-CeO 2 composite material possesses intrinsic peroxidase-like activity, and this finding was applied to design a rapid and selective colorimetric assay for H 2 O 2 , glucose and cholesterol.
研究领域:
生物化学
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医学检测
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纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Qiyuan Chen,Lu Liu,Lifen Liu,Yizhen Zhang
Emissions of volatile organic compounds (VOCs) air pollutants could worsen air quality and adversely affect human health, thus developing more efficient low-temperature VOCs removal techniques is desired. A novel continuous system integrating UV-assisted photo-electrochemical catalysis with microbial fuel cell (UV-assisted PEC-MFC) has been established for promoting removal of gaseous ethyl acetate or toluene and generating electricity simultaneously. In this system, CeO 2 /TiO 2 /ACF catalytic cathode is prepared and used for combination with bio-anode for accelerating cathodic reaction . This UV-assisted PEC-MFC system exhibits an excellent elimination capacity (EC) of ethyl acetate (∼0.39 g/m 3 , EC: ∼2.52 g/m 3 /h) or toluene (∼0.29 g/m 3 , EC: 1.89 g/m 3 /h) under close-circuit condition. Furthermore, an outstanding elimination capacity (EC: 28.04 g/m 3 /h) for high concentration toluene (∼4.10 g/m 3 ) removal is obtained after toluene gas passes sequentially through the catalytic cathode then the bio-anode. This way of PEC degradation and biodegradation, avoids inhibition of exoelectrogens activity from toxicity of high concentration toluene. Simultaneously, the cell voltage of UV-assisted PEC-MFC system is stable at 0.11 V (vs. SCE) and 1.452×10 −4 kWh is generated from treatment of toluene gas stream in 6 h duration time. The possible mechanism of VOCs removal in this novel system has been proposed and discussed. This study provides new technical basis for treating gaseous pollutants via integrating photo-electrochemical catalysis with electricity generating microbial fuel cell for energy conversion.
研究领域:
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Xianhua Ji,Huiyu Liang,Sukai Hu,Bo Yang,Ke Xiao,Gang Yu
A novel CuO–CeO 2 –Co 3 O 4 nanocatalyst loaded on Al 2 O 3 ceramic composite membrane (CCM-S) was synthesized through spraying-calcination method, which can be beneficial to the engineering application of scattered granular catalyst. BET and FESEM-EDX testing revealed that CCM-S possessed a porous character with high BET surface area of 22.4 m 2 /g and flat modified surface with extremely fine particle aggregation. The CCM-S calcined above 500 °C presented excellent anti-dissolution effect due to the formation of crystals. XPS indicated that the composite nanocatalyst possessed the variable valence states, which were conducive to exert the catalytic effect of Fenton-like reaction. Subsequently, the effects of experimental parameters including fabricate method, calcination temperature, H 2 O 2 dosage, initial pH value, and CCM-S amount were further investigated considering the removal efficiency of Ni(II)-complex and COD after decomplexation and precipitation (pH = 10.5) treatment within 90 min. Under the optimal reaction condition, the residual Ni(II)-complex and Cu(II)-complex concentration from actual wastewater was all lower than 0.18 mg/L and 0.27 mg/L, respectively; meanwhile, the removal efficiency of COD was all higher than 50% in the mixed electroless plating effluent. Besides, the CCM-S could still maintain high catalytic activity after a six-cycle test, and the removal efficiency was slightly declined from 99.82% to 88.11%. These outcomes indicated that CCM-S/H 2 O 2 system was provided with a potential applicability on treatment of real chelated metal wastewater.
研究领域:
环境工程
·
材料科学
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yingying Jin,Kaihao Fan,Miao Feng,Yaoguang Wang,Hongfeng Chen,Xuesong Liu
This study investigates synergistic effects in Ni/CeO 2 catalysts for ammonia decomposition, comparing impregnation and mechanical mixing preparation methods. The impregnated catalyst achieved >90 % NH 3 conversion above 500 °C, outperforming Ni/SiO 2 and mixed counterparts. Strong interactions at the Ni-CeO 2 interface facilitated the formation of Ni-O-Ce bonds, lattice distortion, and oxygen vacancies (O v )/Ce 3+ species, enhancing Ni dispersion (34.7 nm vs. 73.1 nm) and electron transfer. Optimal NH 3 pretreatment (550 °C, 1.5 h) generated metallic Ni 0 as the primary active species, with higher Ni 0 content (XPS) and reducibility (H 2 -TPR). The novelty lies in establishing how NH 3 pretreatment dynamically assembles contiguous Ce 3+ -O v -Ni 0 triads. These sites facilitate rate-limiting N 2 desorption through localized electron donation from O v and Ce 3+ to Ni 0 , which weakens N-N bonds (NH 3 -TPD). Impregnation-derived synergy: (i) enhances Ni dispersion/reduction, (ii) promotes O v formation, and (iii) enables NH 3 -pretreatment-induced assembly of contiguous Ce 3+ -O v -Ni 0 triads that create electron-rich sites, lowering the activation barrier. This work provides a foundation for designing cost-effective catalysts via atomic-scale control of metal-support interactions.
研究领域:
催化
·
材料科学
·
化学工程
·
表面科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yi He,Peng Bai,Shibo Yuan,Jiafa Chen,Yicheng Zhao,Yongdan Li
N -formylation of amines with CO 2 is a promising approach to high-efficient utilization of CO 2 as C1 feedstock, while conventional thermocatalytic processes suffer from harsh reaction condition and intense energy consumption. In this work, photocatalytic N -formylation of amines with CO 2 is achieved at room temperature over Pt-Bi/CeO 2− x composite catalyst. The Pt-Bi bimetallic sites increase the concentration of surface oxygen vacancies. Furthermore, the synergistic effects of Pt and Bi improve the light absorption capacity, reduce the band gap energy of the photocatalyst and promote the separation of photoinduced charge carriers. Using PhSiH 3 as the reducing agent, the conversion of N -methylaniline reaches 100 % after 3 h irradiation in N, N -dimethylformamide solvent with a N- methylformanilide selectivity of 90.8 %. The composite photocatalyst shows promising cycling stability and universality.
研究领域:
化学
·
催化
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jiehua Bao,Yuming Zhou,Yiwei Zhang,Yanyun Wang,Shuang Liang,Zhiwu Guo,Chang Guo,Yi Xue,Tao Zhuang,Yingjie Hu
In this study, we synthesized a series of Ni-based catalysts with different CeO 2 contents (0, 1, 2, 5 and 10 wt%) anchoring on the Al-Mg oxide spheres (AMO) with three-dimensional hollow flower-like structure. The triethoxyoctylsilane (TEOOS) and polyvinylpyrrolidone (PVP) were selected as effective modified reagents to introduce hydrophobic functionality on the surface of AMO and Ni-CeO 2 nanoparticles, respectively, for controllable anchoring Ni-CeO 2 nanoparticles on AMO by hydrophobic interaction driving mechanism. The effects of CeO 2 content on the texture, dispersion of Ni species, the reducibility of Ni 2+ , surface electronic states and acidity were investigated in detail. The Ni-5CeO 2 /AMO was found to achieve the highest 2,2′-bipyridine selectivity of 90.6% and maximum turnover number (TON) of 8611, specifically. Moreover, the Ni-5CeO 2 /AMO exhibits superior stability, maintaining 89% of 2,2′-bipyridine yield after 6 runs, due to the mitigated nickel leaching and promotion of the desorption of 2,2′-bipyridine. Furthermore, with the help of DFT calculations, a possible reaction mechanism was discussed and illustrated.
研究领域:
催化化学
·
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
Applied Surface Science Advances
·
2024
·
IF 7.5
Chao Zhao,Xinyu Wu,Tianqi Cheng,Tsz Yeung Yip,Bo Yuan,Wanqing Dai,Shengpei Zhang,Yuwei Qiu,Jian Lin Chen,Shang-Wei Chou,Yung-Kang Peng
Marine biofouling poses significant challenges for maritime industries, leading to increased maintenance costs and ecological disturbances. While Cu-based biocide coatings are effective in combating biofouling, they raise environmental concerns and have limited lifespans. This has spurred interest in sustainable alternatives inspired by marine organisms, such as haloperoxidases (HPOs) found in certain algae, which can convert H 2 O 2 and Br − in seawater into HOBr to mitigate biofouling. However, the practical implementation of HPOs is limited by their stability and cost. Nanozymes like CeO₂ have emerged as promising alternatives; however, conventional coating methods—typically involving the replacement of Cu-based biocides with CeO 2 nanoparticles (NPs) in resin—restrict their exposure to H 2 O 2 and Br⁻, resulting in significant activity loss. This study presents a simple method for mass-producing CeO 2 NPs embedded in free-standing porous carbon as HPO mimetics. The optimized sample demonstrates exceptional HPO-like activity and antibacterial performance. Most importantly, we have shown that these HPO mimetics can be directly grown on steel surfaces during preparation, eliminating the need for a dispersant. This direct coating technique effectively addresses the challenges associated with conventional resin method, facilitating the development of a sustainable antibacterial and antifouling coating with preserved activity.
研究领域:
材料科学
·
海洋生物学
·
环境科学
✓ 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）