CHEMICAL ENGINEERING RESEARCH & DESIGN
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2023
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IF 3.9
Honghui Xiong,Jinglei Liu,Yongjun Zhang,Hao Wang,Enhao Sun
To reduce the coke formation, a novel Al/Si/Cr/Ce composite ceramic coating was prepared on the surface of the Cr 25 Ni 35 Nb alloy substrate by pack cementation. The microstructure, phase composition, surface morphology and element distribution of substrate and coating were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results reveal that the outer layer of the coating forms a protective layer with a high proportion of AlN and Cr 3 Si and trace amounts of Ce. The inter-diffusion layer is mainly aluminide coating (AlNi and AlFe) and transition layer contains a small amount of AlN. The anti-coking performance of the coating was assessed using naphtha steam cracking. To study coking behavior, the morphology and microstructure of the coke layer were analyzed and characterized by SEM and Laser Micro-Raman Spectrometer. The coke layer on uncoated sample has a higher focal density and is more likely to spall and peel off when subjected to coking experiment. A large number of filamentous and granular cokes appear on the surface of the uncoated sample, whereas only less granular cokes appear on the surface of the coated sample, and the coke on the uncoated sample has a more disordered and amorphous carbon structure. The coating significantly inhibited the growth of filamentous coke and reduced coke accumulation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
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IF 8.1
Wenyue Jiang,Bingxin Zhao,Ziting Li,Peng Zhou,Yuxin Zhao,Xiaoshuang Chen,Jinping Wang,Rui Yang,Chunling Zuo
The investigation of cost-effective and highly efficient electrocatalysts for alkaline water and simulative seawater oxidation is essential to the conversion and storage of renewable energy . In this paper, the Ce–NiSe 2 /CoP catalyst with multihole and ultrathin nanosheet structure is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets contribute the excellent OER performance under different alkaline 1 M KOH and simulated seawater (1 M KOH + 0.5 M NaCl) electrolytes. Specifically, this catalyst exhucture is generated. The unique structural characteristics of Ce–NiSe 2 /CoP heterojunction nanosheets conibits the low overpotentials of 287 and 304 mV at the current density of 10 mA cm −2 , along with the Tafel slopes of 87.1 and 78.8 mV dec −1 in two solutions, respectively. Moreover, the Ce–NiSe 2 /CoP target product also displays good stability. The present study introduces a promising strategy for the advancement of high-performance electrocatalysts in green energy field.
研究领域:
材料科学
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可再生能源
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 33
·17174-17184
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IF 11.301
Jianwei Fan,Xufei Niu,Wei Teng,Peng Zhang,Wei-xian Zhang,Dongyuan Zhao
Catalytic oxidation of formaldehyde (HCHO) is regarded as a promising strategy to eliminate this indoor air pollutant. The design of a highly active and cost-effective catalyst is still pivotal to improve the performance for HCHO oxidation. Herein, we report an Fe–Ce–O solid solution catalyst supported on ordered mesoporous silica (SBA-15) prepared by simple two-step impregnation–calcination, achieving highly efficient HCHO elimination at a low temperature. This strategy brings about the formation of small solid solution nanoparticles (7–12.9 nm) with good dispersion in confined spaces. Meanwhile, the catalysts possess large surface areas (∼500 m2 g−1) and pore volumes (0.5 cm3 g−1) with a pore size of ∼7.5 nm. The results show that Fe content and calcination temperature have great effects on the generation of oxygen vacancies in the catalyst, and further on the catalytic performance. The 20% FeOx-CeOx/SBA-15-350 catalyst displays superior catalytic activity with 65% and 94.9% conversion at 30 °C and 60 °C with a low concentration of HCHO (9.8 μg L−1), respectively, comparable to that for many reported precious metal catalysts. The high ratio of Ce3+ due to the formation of an Fe–Ce–O solid solution and highly dispersed active sites by the spatial confinement is favorable for more oxygen vacancy generation, which mainly contributes to the excellent performance. This work opens up an avenue to design highly efficient non-noble metal nanocatalysts for volatile organic compound (VOC) elimination.
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 RARE EARTHS
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2020
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IF 3.104
Baohuai Zhao,Rui Ran,Liu Yang,Xiaodong Wu,Zhichun Si,Duan Weng
A series of La 1– x Ce x MnO 3+ δ ( x = 0, 0.05, 0.1, 0.2, and 0.3) perovskites and Mn–Ce mixed oxides were prepared. Their physico-chemical properties were systematically characterized and the NO oxidation activities of the catalysts were investigated. The La 0.9 Ce 0.1 MnO 3+ δ has the best activity among all of the catalysts, with a maximum NO conversion of 85% at 300 °C. The characterization results indicate that the doping of Ce improves the properties of the perovskites in terms of the specific surface area, the average valence state of Mn ions, the number of reactive oxygen species and the NO x desorption behaviors. The Mn–Ce mixed oxide calcined at 500 °C shows a similar NO oxidation activity with La 0.9 Ce 0.1 MnO 3+ δ . However, the activity of the mixed oxide obtained at 750 °C decreases a lot, which results from the loss of active sites and active oxygen species.
研究领域:
材料科学
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环境催化
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产品关联
DOI
高影响因子
npj Parkinsons Disease
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2025
·Vol. 11
·期 1
·1-10
·
IF 8.2
Lei Li,Chen Xiuli,Long Xincheng,Tu Qiuxia,Zhao Liping,Huang Dan,Song Lingli,Wang Jiaojiao,Zhai Suzhen,Chen Xiaozhong,Zhang Chunlin
Inspired by natural enzymes, artificial enzymes have garnered significant interest due to their simplicity of production, robustness under harsh conditions, and enhanced stability. This study introduces, for the first time, a novel Z/Ce@hemin composite enzyme, constructed by anchoring hemin onto zeolitic imidazolate framework-8 (ZIF-8)-encapsulated ceria (CeO 2 ) nanoparticles. This innovative design overcomes the challenges of hemin dimerization, enhances substrate affinity, and accelerates mass transport, leading to significantly improved peroxidase-like activity. The enzyme also demonstrates remarkable stability and resistance to environmental interference. Utilizing this Z/Ce@hemin composite, a sensitive and selective colorimetric detection system was developed for rapid and accurate quantification of hydrogen peroxide (H 2 O 2 ), a key oxidative stress marker. This approach was successfully applied in cellular models and Caenorhabditis elegans models of Parkinson’s disease, enabling precise monitoring of H 2 O 2 . The study provides a groundbreaking platform for oxidative stress modeling and expands possibilities in neurodegenerative disease research and therapeutic screening.
研究领域:
生物化学
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医学
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神经科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Chenhui Hu,Chunhong Liu,Kaimin Du,Chengkai Pang,Zuoxi Zhuo,Qiangsheng Gao
An energy-saving catalyst 4%Fe/Ce-Mn-TiO 2 was prepared via a simple one-step impregnation-annealing process and used as a denitration catalyst at low temperature (≤180 °C) and high water content (∼20%). The results show that 4%Fe/Ce-Mn-TiO 2 catalyst exhibits good low-temperature catalytic activity and water resistance attributed to its highly dispersed metal oxide species, more surface-adsorbed oxygen and high stability of particles. The denitrification efficiencies of 4%Fe/Ce-Mn-TiO 2 catalyst are 90% (5% H 2 O) and 70% (20% H 2 O) at 170 ℃ respectively, which are superior to the commercial vanadium catalyst in service usually needs heating up to 220 ℃.
研究领域:
环境科学
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催化
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化学工程
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DOI
高影响因子
Applied Sciences-Basel
·
2018
·Vol. 8
·期 1
·95
·
IF 1.689
Chengzhi Wang,Cheng Zhang,Yonggang Zhao,Xin Yan,Peng Cao
Honeycomb cordierite-based Mn–Ce/Al2O3catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NOxwith NH3, with and without SO2and/or H2O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NOxconversion at 100 °C in the absence of SO2. However, SO2reduces the catalytic activity (80% to 72%) of the honeycomb cordierite-based Mn–Ce/Al2O3catalysts under identical conditions. This finding demonstrated that the catalyst exhibited high activity at low temperature and excellent SO2resistance in the presence of 50 ppm SO2. The fresh and sulfated honeycomb cordierite-based Mn–Ce/Al2O3catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N2adsorption–desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. Characterization results indicated that the deactivation by SO2was primarily the result of the deposition of ammonium hydrogen sulfate and sulfated CeO2on the catalyst surface during the SCR process. The formed sulfates depressed the catalytic activity via the blocking of pores and the occupation of active sites. Additionally, the competitive adsorption between SO2and NH3always decreased the catalytic activity.Keywords:Mn–Ce/Al2O3catalyst;low temperature selective catalytic reduction;honeycomb cordierite;SO2resistance
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Junfei Ou,Xing Chen
By alternative immersion into the aqueous solutions of phytic acid (PA) and CeCl 3 for n cycles, a nanocomposite coating coded as (PA/Ce) n was fabricated on the magnesium substrate. The Ce 3+ ions were supposed to coordinate with the phosphate groups of the PA molecules and the (PA/Ce) n coatings adhered to the substrate firmly (5B according to the ASTM D 3359 method). Compared with the PA coating, the Ce 3+ ions enhanced the corrosion resistance of the PA/Ce nanocomposite coating . To further improve the corrosion resistance , the (PA/Ce) n coatings were immersed into the ethanol solution of hexadecyltrimethoxysilane (HDMS) and followed by heating in air. The so-obtained sample coded as Mg-H 2 O-(PA/Ce) n -HDMS was superhydrophobic and possessed much better corrosion resistance as compared with the Mg-H 2 O-(PA/Ce) n sample due to the retained thin layer of air at the solid/water interface in the NaCl aqueous solution. For four cycles, the Mg-H 2 O-(PA/Ce) 4 -HDMS sample showed the most excellent superhydrophobicity with a contact angle of 167.3 ± 2.1° and a sliding angle of 2.7 ± 0.8° due to its hierarchical surface morphology . Moreover, for four cycles, the retained air was most durable and remained intact after immersion for 80 h; consequently, the corrosion resistance of the Mg-H 2 O-(PA/Ce) 4 -HDMS sample was found the best. In one word, the corrosion resistance of PA to the Mg substrate was improved by incorporating with Ce 3+ ions and further modifying by HDMS molecules. The present study provided a new conversion coating by combining the synergistic anti-corrosion effect of PA, Ce 3+ ions, and the surface superhydrophobicity.
研究领域:
材料科学
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腐蚀工程
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表面化学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Huijiao Wang,Siyuan Xue,Weiyi Wang,Fan Gao,Shizuo Yi,Jiayin Li,Yuxin Yang,Erzhuo Zhao,Jianchao Wang,Jianbing Wang
In this study, an efficient Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 electrode was fabricated for triclosan electro-oxidation by co-doping the transition metal Ce and carbon nanotubes (CNTs) into the PbO 2 active layer . Characterization results show that the co-doped Ce and CNTs present a synergistic effect on covering the obvious cracks on the Ti/SnO 2 -Sb 2 O 3 surface, decreasing the PbO 2 crystal size, increasing the electrode oxygen evolution potential from 1.60 to 2.17 V vs SCE, and reducing the charge transfer resistance by 66 %. Consequently, Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 was the most effective and energy-efficient electrode for hydroxyl radical (•OH) generation and triclosan electro-oxidation in this study. Compared with other two electrodes (Ti/SnO 2 -Sb 2 O 3 and Ti/SnO 2 -Sb 2 O 3 /Ce-PbO 2 ), triclosan removal by Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 was accelerated by 1.8–2.6 times, with the energy demand for abating 90 % triclosan (E EO ) decreased by 49 % – 67 %. Furthermore, triclosan degradation pathways were proposed based on density functional theory (DFT) calculation and transformation product (TP) identification, with •OH addition at C14 and C11 sites being the most favorable pathway. In addition, the estimated acute and chronic toxicities of TPs were generally decreased than their mother compound. Therefore, the results of this study suggest the feasibility and effectiveness of the Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 electrode for triclosan electro-oxidation.
研究领域:
环境科学
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材料科学
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电化学工程
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Mingkang Zhang,Jingwei Wu,Haolin Yang,Xiaohan Wang,Zebao Rui,Junfei Chen
Selective catalytic reduction of nitrogen oxides with methane (CH4-SCR) is an effective way to simultaneously eliminate NOx and CH4 emissions. Development of efficient CH4-SCR reaction system with high NOx reduction activity and selectivity is highly desirable for its commercial application. Herein, a two-part relay reaction system, including sequentially Co@S-1 and In-Ce/H-Beta catalysts, is designed for boosting CH4-SCR. In this system, the Co@S-1 with high redox ability boosts NO oxidation to NO2 and generates key intermediate CH3NO2 that can partially be in situ oxidized and the excessive can migrate to In-Ce/H-Beta. Meanwhile, the inner synergistic effect between InO+ and CeO2 species on In-Ce/H-Beta not only exhibits fair CH4-SCR performance, also facilitates the formation of NO- 3 species to react with the migrated CH3NO2 from Co@S-1. Benefiting from the combination between outer active sites synergy and inner active sites synergy, the simultaneous efficient conversion of NOx (T50 = 380 ℃) and CH4 (T50 = 425 ℃) with well durability is achieved.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
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IF 3.9
Weiwen Wang,Mengqi Bian,Hui Zhao,Rui Liu,Qinghai Zhang,Yunlong Qu,Guanghui Chen,Jihai Duan
The direct synthesis of methyl methacrylate from isobutene is of great importance in the chemical industry. The direct oxidation of isobutylene to methacrylic acid is one of the key steps, but the selectivity of methacrylic acid is low in the products of one-step oxidation of isobutylene. The efficient one-step oxidation of isobutylene to methacrylic acid was achieved by preparing a Mo-V-P-Ce/KCsWPAV two-component composite catalyst combining asymmetric lattice oxygen with appropriate acidic heteropolyacid catalysts. The catalyst was characterized using XRD, FT-IR, BET, SEM, and others to analyze its structural properties, dimensional characteristics, and more. Results indicated that the composite catalyst accelerated the crystallization rate, with Ce enhancing the oxidation of the active molybdenum species and promoting oxygen activation to form lattice oxygen, thereby improving the oxidation of isobutylene. The heteropoly acids increased the percentage of medium strong acidic sites, enhancing the selectivity of methacrylic acid. Under optimized conditions, with an atmosphere to isobutylene molar feed ratio of ≥25:1 and a temperature of 400 °C, the Mo-V-P-Ce/KCsWPAV catalyst achieved a remarkable 91 % conversion of isobutylene with a 70 % selectivity towards methacrylic acid. The catalyst shows promise for practical applications in the one-step oxidation of isobutylene to produce methacrylic acid, providing a suitable solution to the problem of isobutylene overcapacity.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Ji-Min Yang,Bao-Chan Yang,Yan Zhang,Rui-Ning Yang,Shan-Shan Ji,Qiang Wang,Shuai Quan,Run-Zhi Zhang
Porous metal–organic frameworks (MOFs) exhibit excellent characteristics for the adsorptive removal of environmental pollutants. Herein, the surface charge, adsorption sites, and adsorption spaces in the pore channels of UiO-67 nanocrystals were modulated by Ce(III) doping to reveal the effects of these parameters on the removal of organic dyes such as methylene blue (MB), methyl orange, and Congo red from aqueous solution. The MB adsorption capacity of Ce(III)-doped UiO-67 (398.9 mg g −1 ) exceeded that reported for pristine UiO-67 by 85%, which was rationalized by zeta potential measurements and adsorption isotherm analyses. As a result, it was revealed that whereas electrostatic repulsion occurred between MB and pristine UiO-67, electrostatic attraction occurred between MB and Ce(III)-doped UiO-67. Furthermore, Ce(III) doping promoted π–π interactions between the adsorbent and the adsorbate. Thus, Ce(III) doping increased MB adsorption capacity despite decreasing the number of adsorption sites and spaces in channels. The obtained results shed light on the mechanism of organic dye adsorption on MOFs and revealed that the synergetic interplay of electrostatic and π–π interactions, adsorption sites, and adsorption spaces increases the adsorption capacity for cationic dyes while decreasing that for anionic dyes.
研究领域:
环境科学
·
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）