MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Lulu Cui,Weijie Shi,Houshen Li,Xiuxian Zhao,Shiyun Ai,Xiangju Meng,Shuhong Sun,Zeyi Guo
For bimetallic nanozymes, the closeness between the two elements is closely related to their properties, but achieving tight contact between the two components still faces challenges. Herein, copper was introduced by the coordination effect between the organic ligand in Ce-MOF and Cu 2+ , then a series of Cu-CeO 2 nanozymes were obtained by thermal treatment. The content of copper can be easily controlled and the spindle-shaped structure assembled by multilayer flakes can be obtained. The total antioxidant capacity (TAC) detection program based on the excellent peroxidase (POD)-like activity of the as-prepared Cu-CeO 2 nanozyme showed a wide linear detection range and ideal detection limits for ascorbic acid (AA), glutathione (GSH), Trolox and cysteine (Cys). More importantly, this method can be applied in TAC detection of commercial samples. This work provided a method for the design of high performance bimetallic nanozymes and developed a sensor that can be applied to detect TAC in vitamin C tablets and beverages.
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RARE METALS
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2025
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IF 11
Fan Siyu,Xu Tianxi,Yang Hui,Ge Yan,Wang Genlin,Ohno Teruhisa,Xu Bin
In this study, a novel Ce-based metal–organic framework (Ce–OFDC) was synthesized via the hydrothermal method. To enhance its photocatalytic antimicrobial properties, polymeric carbon nitride (PCN) was incorporated into the Ce-OFDC matrix, forming a Ce-OFDC/PCN composite material. Antibacterial assays demonstrated that Ce-OFDC/PCN had significant inhibitory effects on both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), achieving inhibition rates of 99.5% and 94.3%, respectively. Notably, the antibacterial performance of Ce-OFDC/PCN was superior to that of Ce-OFDC or PCN alone. Furthermore, photocurrent and electrical impedance scanning measurements demonstrated that the Ce-OFDC/PCN composites showed improved photocurrent response and superior efficiency in separating photogenerated electrons and holes. The photocurrent density of Ce-OFDC/PCN reached 120 μA cm −2 , which was 1.5 times higher than that of PCN (80 μA cm −2 ) and 12 times higher than that of Ce-OFDC (10 μA cm −2 ). Electron paramagnetic resonance analysis indicated that reactive oxygen species played a crucial role in the antimicrobial process, with superoxide radicals (·O 2 − ) and hydroxyl radical (·OH) showing the most prominent influence. We conducted reactive oxygen species (ROS) scavenging experiments to further confirm this view. After adding glutathione (GSH) to remove all ROS, the antibacterial efficiency of Ce-OFDC/PCN decreased by about 40%. Adding D-mannitol to remove ·OH reduced the inhibition rate to 54.7%, and adding superoxide dismutase (SOD) to remove ·O 2 − reduced the inhibition rate to 65.4%. The Ce-OFDC/PCN heterostructure increased the separation efficiency of photogenerated electrons and holes, producing increased reactive oxygen species. That, in turn, contributed to the observed superior photocatalytic antibacterial performance. This research significantly advanced the development of metal–organic framework (MOF)-based materials and provided valuable insights into the design of antimicrobial photocatalysts. Graphic abstract
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ACS Catalysis
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2025
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IF 13.1
Zhiying Liu,Meiqing Shen,Shuhuan Wang,Chunjuan Zhang,Jun Wang,Wei Li,Feng Gao
To elucidate how CeO2 additives enhance the activity and stability of Cu-SSZ-13 SCR catalysts, we investigated two CeO2/Cu-SSZ-13 composite catalysts with Cu loadings of 1.0 and 2.5 wt %. These catalysts were characterized using an array of techniques, including XRD, SEM, TEM, NMR, H2-TPR, NH3-TPD, DRIFTS, DFT and SCR reactions under both steady-state and transient kinetic analysis conditions. Our findings demonstrate that CeO2 promotes low-temperature SCR by forming exchanged, isolated Ce-ions, which enhance Cu-ion coupling efficiency. External surface CeO2 particles can convert NO + O2 to surface nitrates, but these species primarily act as spectators below ∼250 °C, and do not contribute to the enhancement of low-temperature SCR activity. In contrast, these surface CeO2 particles can synergizes with Brønsted acid sites (BAS) to elevate high-temperature SCR activity. Furthermore, hydrothermal stability and sulfur resistance are improved by the presence of external surface CeO2 particles, a benefit that applies irrespective of Cu loading.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Yanwei Sun,Guangyan Xu,Chang Liu,Yajie Pan,Yingjie Wang,Yunbo Yu,Hong He
Although palladium-based catalysts exhibit excellent methane oxidation activity, sulfur poisoning still leads to severe deactivation. To overcome this, we synthesized an oxide-zeolite (OXZEO) composite, Ce x /Pd@MFI, via combined hydrothermal treatment and ball milling . In the resulting architecture, PdO x active sites are spatially confined within the MFI framework, while CeO 2 nanoparticles uniformly decorate the external surface as protective species. The optimized Ce 3 /Pd@MFI catalyst demonstrated markedly enhanced sulfur resistance, achieving a T 50 —the temperature at which 50 % CH 4 conversion occurred—of 361 °C after sulfation with 100 ppm SO 2 . Moreover, Ce 3 /Pd@MFI maintained sulfur-resistant stability for 110 h, far surpassing Pd@MFI and Pd/Al 2 O 3 , which rapidly deactivated upon exposure to SO 2 for bare 1 h. Furthermore, we proposed a redox-atmosphere switching method to regenerate sulfated CeO 2 protective species, thereby enabling the Ce x /Pd@MFI catalysts to maintain durable sulfur tolerance. The broad applicability of the OXZEO design was further confirmed in CO oxidation : Ce 3 /Pd@MFI remained stable under high SO 2 concentrations during CO oxidation. This work establishes a paradigm for engineering sulfur-resistant palladium catalysts via synergistic spatial confinement and protective-site incorporation, offering critical insights for the development of robust emission-control catalysts in sulfur-rich environments.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Chen Feng,Haoxi Jiang,Lingtao Wang,Guochao Yang
CO 2 methanation is a critical process for converting CO 2 greenhouse gas into clean methane fuel, which holds significant strategic importance for environmental sustainability and energy sectors. Thermodynamic limitations demand low-temperature catalysts with enhanced low-temperature activity. This study employs solvent evaporation-induced self-assembly (EISA) to in-situ encapsulate Ni and Ce within SBA-15 molecular sieves. The approach significantly enhances low-temperature reactivity, achieving 67.5% CO 2 conversion and nearly 100% CH 4 selectivity at 300 °C, outperforming among Ni-based catalysts with silica carriers. Textural and electronic characterizations reveal that confinement effects of SBA-15 and electronic promotion of Ce synergistically strengthen the low temperature activity in methanation. This results in smaller Ni nanoparticles and an electron-rich Ni state, optimizing catalytic performance. Mechanistic analysis suggests that the Ce-modified Ni catalyst favors the formate pathway over the CO pathway, which supports the high methane selectivity and low carbon monoxide selectivity observed in this study.
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Journal of Cleaner Production
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2025
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IF 10
Yuting Lin,Yuran Li,Qiang Cao,Jianshan Wang,Yanbin Cui,Tingyu Zhu
The activity of carbonyl sulfur (COS) hydrolysis catalyst is inhibited by hydrogen chloride (HCl) and then restricts the application of blast furnace gas purification. The presence of HCl significantly reduces the COS hydrolysis conversion by destroying the Al-O bond and -OH. A novel Na and Ce supported Al-based catalyst (Na-Ce/Al 2 O 3 ) was designed to enhance the activity of COS hydrolysis in an HCl-containing atmosphere. It has been found that the addition of Ce creates oxygen vacancy, with three effects on promoting catalyst activity. The oxidation of hydrogen sulfide (H 2 S) is inhibited due to the occupation of the oxygen vacancy by HCl, reducing the sulfur species deposition. H 2 O can be adsorbed and dissociated on the oxygen vacancy to produce -OH group, improving COS hydrolysis. HCl can be preferentially anchored on the oxygen vacancy based on the adsorption energy, protecting -OH group. The improvement of HCl-resistance is essential for the Na-Ce/Al 2 O 3 hydrolysis catalyst to adapt to the complex atmosphere of blast furnace gas and increase the catalyst lifespan.
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ACS Applied Nano Materials
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2025
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IF 5.5
Hao Sun,Hui Yuan,Jiangshan Hu,Jiayu Chen,Jie Han,Peiyuan Wang,Can-zhong Lu,Ting Hu,Yuhang Li
Psoriasis is a prevalent chronic inflammatory disorder affecting approximately 0.72% of the Chinese population. Currently, available treatments cannot completely cure this disease. The excessive production of reactive oxygen species (ROS) has been considered to be a key contributor to the progression of psoriasis. In this study, Ce and Mn were doped into mesoporous silicon nanomaterials with optimized ratios that could form uniform and well-dispersed CM@MSNs particles, which were able to effectively remove a wide range of ROS. As a result, treatment with CM@MSNs could reduce epidermal hyperplasia and prevent inflammatory reactions in the imiquimod (IMQ)-induced psoriasis-like model in mice. Mechanistically, CM@MSNs might prevent the inflammation by repressing the IL-17 and NF-κB signaling pathways and ameliorating epidermal hyperplasia through the activation of both canonical and noncanonical Wnt signaling pathways. In conclusion, this research could lead to a promising treatment method for psoriasis. This work provides an example of nanoenzymes for effectively scavenging ROS of diseases.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Liang Chu,Zhaokun Wang,Teng Zhao,Mu Yang,Ge Wang
Metal-organic frameworks (MOFs) as host-guest catalyst in oxidative desulfurization (ODS) face challenges due to limited access to active sites through their microporosity. Herein, hierarchical porous Ce-UiO-66 (HCU) was synthesized through a templating method in an aqueous environment to enhance host accessibility; phosphotungstic acid (PW) was uniformly loaded within the mesopores of HCU via post-impregnation; Ce sites were exposed by selective removing the coordinated acetate from the HCU with the acid post-treatment, these synergistically optimized the catalytic potential of the composite. The resulting HCU@5PW-H demonstrates outstanding desulfurization performance (1000 ppm sulfur removal) within 16 minutes under mild conditions (40 °C, O/S molar ratio = 5) and maintains high efficiency over at least eight cycles. The catalytic mechanism involves the decomposition of H 2 O 2 to reactive oxygen species (ROS) and the formation of W VI -peroxo intermediates that determine the ODS activity. This synergistic mechanism offers a promising strategy to enhance the oxidation potential of hierarchical porous MOF-based host-guest catalysts under mild conditions.
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PubMed
高影响因子
CRYSTENGCOMM
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2025
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IF 2.6
Feng Jiao,Jinzhao Huang,Zehui Liu,Yu Zhang,Xiaolong Deng,Ke Zhang,Guixin Zhao
In this paper, sodium sulfite (Na₂SO₃) and cerium nitrate (Ce(NO₃)₃) were added in the hydrothermal method for the preparation of FeCo LDH, and needle-like Ce-FeCo LDH (NS) catalysts were grown in situ on a carbon cloth.The additions of Na₂SO₃ and Ce(NO₃)₃ regulated the electron transfer of the metal cations in the LDH, and significantly improved the performance of the catalysts. The prepared Ce-FeCo LDH (NS) catalysts exhibited excellent electrochemical properties. The overpotential of OER was 221 mV at a current density of 10 mA/cm² in 1 M KOH. The surface structure and catalytic performance of the catalysts were maintained well after 100 h stability test. This study provides a new idea for the improvement and design of OER catalysts based on FeCo LDH, which is an important reference for clean energy research.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
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IF 1.693
Xiao-Ming Peng,Yu-Feng Hu,Jin-Zhu Zhang,Zhi-Xin Wang,Zhe-Yu Li,Chao Miao
Viscosities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K and atmospheric pressure. The results were used to test the applicability of simple equations for the viscosity of mixed solutions. The predictions agree well with measured values, implying that the viscosities of the examined electrolyte solutions can be related to those of their constituent binary solutions using these simple equations.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 101
·期 12
·6807-6816
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IF 2.1
Renjie Deng,Wenjin Ni,Yao Tian
Bimetallic cerium-manganese modified Hβ zeolite sample (Ce/Mn-Hβ) was prepared by ultrasonic assisted impregnation method and applied in nitration of toluene. The characterization results show that the active components (Ce and Mn) are successfully introduced into the framework of Hβ zeolite. The catalyst shows excellent catalytic activity and reusability for the nitration of toluene, giving high para selectivity. Under optimized conditions, it gives 68.7% selectivity to para -nitrotoluene at 88.6% conversion over Ce/Mn-Hβ in the presence of acetic anhydride (Ac 2 O). The theoretical calculations indicate that the Ce/Mn bimetallic active sites in modified Hβ zeolite can easily activate the nitrification reagent (AcONO 2 ), and the enhancement of para selectivity is owing to the steric hindrance of catalyst. Furthermore, the reaction mechanism was proposed by the combination of experimental results and theoretical calculations.
研究领域:
化学工程
·
催化材料科学
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 14
·19883-19894
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IF 5.164
Shilin Luo,Zhitong Xu,Jian Liu,Baoliang Xu,Shiyin Ji,Yi Ding,Shengtai Zhang,Ling Zhang,Tao Duan,Jiehong Lei
Summary Yttrium iron garnet (YIG) is a potential matrix for immobilizing high-level radioactive waste (HLW) due to its high actinide solubility and chemical flexibility. In this study, Ce was employed as a surrogate of Pu. A series of Y 3- x Ce x Fe 5 O 12 (0 ≤ x ≤ 1) samples were prepared by solid-state sintering at 1400°C to investigate the solubility, microstructure, and chemical durability of Ce-doped YIG. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the solubility of the Ce in a single garnet was 32 mol% at synthesis temperature of 1400°C. The SEM analysis indicated the YIG ceramic grain growth and compactness as Ce concentrations increased. The XPS analysis indicated that the amount of Ce 4+ out of the total Ce increased as the CeO 2 doping increased, and the maximum value was more than 75.9% in the sample synthesis at 1400°C. Static leaching experiments were also conducted on the single Ce-doped garnet synthesized at 1400°C. The normalized LR Ce and LR Y release rates were approximately 10 −4 and 10 −5 g m −2 d −1 after 42 days, respectively. The chemical durability was comparable to other ceramic matrices (such as pyrochlore and zircon, among others). These results demonstrated that YIG ceramics are suitable for immobilizing HLW, such as Pu or U. Highlights The solubility of Ce in single-phase YIG was 32 mol% at 1400°C. Grain size and compactness increased Ce content. The concentration of Ce 4+ in total Ce of sample could be over 75.9%. The obtained YIG ceramics exhibit excellent chemical stability. Novelty Statement Y 3-x Ce x Fe 5 O 12 ceramics were prepared by solid-state sintering and the solubility, microstructure, and chemical durability were investigated. The solubility of Ce was 32 mol% at 1400°C. The obtained YIG ceramics exhibit excellent chemical stability.
研究领域:
材料科学
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核废物管理
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