Molecular Catalysis
·
2022
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IF 5.089
Guanling Yang,Aizhong Jia,Jingde Li,Fang Li,Yanji Wang
Hierarchically porous CeO 2 with excellent catalytic performance for direct dimethyl carbonate (DMC) from CO 2 and methanol was successfully prepared by a simple hydrothermal method due to the abundant oxygen vacancies (Ovs, ∼17%) and large surface area (137 m 2 ·g −1 ). The effects of template dosage as well as synthesis parameters including hydrothermal time and calcination temperature on the physicochemical properties of as-synthesized CeO 2 were studied, and the reaction conditions were investigated and optimized. The obtained results indicated that the Ovs varied with prolonging hydrothermal time and more Ovs were formed by etching due to longer crystal time. And the fabricated Ovs acting as acid sites and basic sites effectively activated CO 2 and methanol, respectively, which was further confirmed by the simulation results, however, the strong acid sites are detrimental to catalyst stability due to their strong chemical interactions with nicotinamide. And a high DMC yield of 260.12 mmol∙g −1 was obtained under the optimal reaction conditions: reaction time 5 h, initial CO 2 pressure 4.0 MPa, and reaction temperature 140 °C.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Huang,Li Wang
This study demonstrates a green and sustainable strategy for efficient single-step recovery of cerium through the rational design of core–shell Fe 3 O 4 @ZIF-8 nanocomposites. The material is comprehensively characterized in terms of morphology, magnetic properties, functional groups, and pore structure. Adsorption studies reveal pH-dependent recovery behavior, with optimal performance in the pH range of 3.9–7.2. Analysis of isotherms and thermodynamics confirms the endothermic nature of the recovery process, showing a monotonic increase in the maximum adsorption capacity from 110 mg g −1 to 185 mg g −1 as temperature rises from 283 K to 328 K. Notably, the effect of ionic strength (IS) suggests that NaCl significantly enhances Ce(III) recovery efficiency, while K 2 SO 4 exhibits marked suppression. Competitive adsorption experiments reveal stronger interference from heavy REEs (Ho 3+ /Tm 3+ ) compared to light REEs (La 3+ ). The fundamental mechanisms are elucidated through multiscale interaction analysis, revealing a synergistic process combining dual-phase transition dynamics and photoinduced redox reactions. The surface architecture of magnetic core evolves from initial ZnO-dominant nanocrystals to ZnO/CeO 2 heterostructures, and ultimately stabilizes as a CeO 2 -enriched framework with increasing Ce(III) concentrations. Moreover, across the time scale, the speciation of surface-adsorbed cerium underwent a gradual transition from Ce(III)-dominance to Ce(IV)-dominance, ultimately forming a regime where Ce(IV) (CeO 2 ) served as the primary species. This progressive transformation enables in situ immobilization and single-step recovery of Ce(III) under mild conditions, establishing a novel paradigm for REEs recovery technology.
研究领域:
环境科学
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材料科学
·
化学工程
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yudong Zhang,Long Liang,Ziyang Chen,Jinjun Wen,Wen Zhong,Sibei Zou,Mingli Fu,Limin Chen,Daiqi Ye
Self-assembled CeO 2 with 3D hollow nanosphere, nanoparticle and nanocube morphologies were prepared and used to support Cu particles. The obtained samples (denoted as Cu/CeO 2 -hs, Cu/CeO 2 -np and Cu/CeO 2 -nc, respectively) were tested for the reverse water-gas shift (RWGS) reaction. Under the reaction conditions, V (H 2 ): V (CO 2 ) = 3:1 and weight hourly space velocity (WHSV) = 300,000 mL g −1 h −1 , the Cu/CeO 2 -hs sample exhibited the best catalytic performance among the as-prepared catalysts. In order to reveal the key factors affecting the catalytic performance, the physicochemical properties of the catalysts were analyzed by XRD, BET, SEM, TEM, H 2 -TPR, quasi in-situ XPS and in situ UV-Raman techniques. The results point out that the particle size of Cu is not the rate-determining factor while the amount of surface oxygen vacancies is highly correlated with the catalytic reaction rate. In situ UV-Raman and in situ DRIFTS experiments indicate the formation of bidentate carbonate and formate species on oxygen vacancy sites which is thought to be the key intermediates for the RWGS reaction. These findings unravel the crucial roles of surface oxygen vacancies on CO 2 adsorption and activation and also highlight a feasible way for the design of highly efficient catalysts for the important RWGS reaction in chemical industry.
研究领域:
催化化学
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材料科学
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Baogui Ye,Zhongwei Zhao,Hongmei Liu
Construction of multi-interface contact step-scheme photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation Estrone and Congo red (CR). In this work, g-C 3 N 4 was selected as the main component, CeO 2 nanosheets with unique Ce 4+ →Ce 3+ conversion property and M-rGO were loaded on the surface of g-C 3 N 4 to construct magnetic photocatalyst, whose structure imparted reusability by magnetic retrieval and at the same time M-rGO acted as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performances were investigated with Estrone and CR, and the results showed that the composite photocatalyst g-C 3 N 4 /CeO 2 /M-rGO could degrade 71% of Estrone and 92% of CR. Free radical scavenger test showed that superoxide and hydroxyl radical species played a major role in the degradation. Furthermore, it was demonstrated that the magnetic photocatalyst g-C 3 N 4 /CeO 2 /M-rGO possessed strong antibacterial properties against Proteus mirabilis. A three-factor-three-level Box-Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), the mass of photocatalyst (mg) and pollution concentration (ppm) by responding surface methodology. It was expected that the g-C 3 N 4 /CeO 2 /M-rGO can be used as a magnetic photocatalyst to achieve its valorization, which has very broad development prospects in the field of environmental remediation or catalysis.
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高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Beilei Li,Xiaoxiang Wang,Yaqing Wang,Weijia Wang,Shuguang Zhou,Shihan Zhang,Wei Li,Sujing Li
Elimination of NO x from the non-electric industrial boilers has become priority under the effective implementation of ultra-low emissions. A series of Ce-promoted FeVO 4 catalysts with improved acidity and reducibility have been synthesized in this work. Thereinto, 10Ce/FeVO 4 exhibited an optimum low-temperature performance with 90% of NO x conversion and 95% of N 2 selectivity at 200–300 °C which was kept nearly unchanged with different concentrations of SO 2 ranging from 50 ppm to 200 ppm, showing a superior sulfur tolerance. An array of well-designed experiments has demonstrated that Ce mainly existed as CeVO 4 under a low doping content (1 wt%) on FeVO 4 , which could efficiently increase the amount of acid sites. With more cerium (5–12 wt%) loading on FeVO 4 , the appearance of CeO 2 further resulted in a strong interaction between cerium species and ion species, thus significantly improving the low-temperature catalytic activity . Therefore, the optimum coexistence of CeVO 4 and CeO 2 over 10Ce/FeVO 4 modulated its Brønsted acid and enhanced its redox circulation of Fe 3+ species. Moreover, the NH 3 -SCR reaction pathways of 10Ce/FeVO 4 were broadened from only Eley-Rideal to both Eley-Rideal and Langmiur-Hinshelwood mechanisms after Ce loading on FeVO 4 catalyst. With the presence of SO 2 , the S O/S-O deriving from the generated Ce 2 (SO 4 ) 3 and NH 4 HSO 4 increased the Brønsted acid sites, inducing a satisfying SO 2 tolerance of 10Ce/FeVO 4 catalyst, although the Langmiur-Hinshelwood pathway of 10Ce/FeVO 4 was immediately cut off due to the competitive adsorption of gaseous SO 2 and NO x . This work exemplifies a promising strategy for developing an ideal low-temperature NH 3 -SCR catalyst with good SO 2 resistance.
研究领域:
催化
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环境科学
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化学工程
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高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Yang Changfeng,Zhang Bowen,Lin Xiaoqian,Han Qinglin,Bao Hongze,Liu Yan
Concentration plays an essential role in generating hydroxyl radicals in irradiated nanoenhancer suspensions. In this paper, we used coumarin-3-carboxylic acid as a hydroxyl radical-specific probe to investigate the hydroxyl radical production of different concentration nanodiamonds (NDs) and CeO 2 NPs in phosphate-buffered saline under x-ray irradiation. NDs significantly enhanced hydroxyl radical production, and the maximum enhancement of hydroxyl radical production was observed at a concentration of 10 µ g/ml, with an enhanced factor of 1.398 ± 0.262. CeO 2 NPs can increase and scavenge hydroxyl radicals at different concentration ranges, with the lowest and highest enhanced factors of 0.623 ± 0.069 and 1.738 ± 0.264, respectively. We tested the hydrodynamic diameter at various concentrations to explore the concentration effect further. We found that with increasing concentration, there might be factors, such as hydroxyl radical recombination and nanoparticle agglomeration, that lead to changes in the enhancement factor. Based on the data from previous and present studies, the experimental results indicate that the concentration factor is essential for hydroxyl radical generation in nanoenhancer suspensions under ionizing radiation. We also provide possible mechanisms for enhancing hydroxyl radical production by nanoenhancers in water under ionizing radiation and the decrease in enhancement factor at high concentrations of nanoenhancers.
研究领域:
辐射化学
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纳米技术
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物理化学
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高影响因子
ACS Catalysis
·
2020
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IF 12.35
Bangxin Li,Shuai He,Jibiao Li,Xiangling Yue,John T.S. Irvine,Deti Xie,Jiupai Ni,Chengsheng Ni
Employment of identical oxides for the cathode and anode in a symmetrical solid oxide fuel cell (SSOFC) is beneficial for decreasing the fabrication costs of a robust cell. Ce doping on the A site of SrFeO3 increased the structural stability in a reducing atmosphere, but ceria was found to exsolve from the perovskite during the cooling process in the air if the doping level reached 20 atom %. The additional doping of 5 atom % Ru in Sr0.8Ce0.2FeO3 on the Fe site could prevent the ceria segregation in air and induce the surface decomposition under fuel conditions for the formation of nanoscale SrO, CeO2, and Ru0. The SSOFC with Ce/Ru codoped SrFeO3 on a Sr- and Mg-doped LaGaO3 electrolyte showed a small Rp value (0.12 Ω cm2) when H2 and ambient air were used as fuel and oxidant, respectively. The peak power densities of 846 and 310 mW cm–2 were achieved at 800 °C using H2 and C3H8 as fuel, respectively. The excellent coke resistance of the anode could be related to the simultaneous in situ exsolution of CeO2, SrO, and Ru0 nanoparticles.
研究领域:
材料科学
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电化学
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能源材料
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燃料电池
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Jie Cao,Jingge Niu,Yizhuo Pang,Tianshu Luo,Jiayi Peng,Xiaohong Hou
Nitrite is a kind of frequently detected inorganic pollutants in water. In order to sensitively and conveniently monitor the nitrite anytime and anywhere, colorimetric sensing method-based nanoenzymes and portably immediate detection devices become urgent. Herein, we utilized L-arginine as a catalyst and a linker to mediate the synthesis of CeO 2 on bimetallic MOFs (CeO 2 @Mn/ZIF-67), with Co and Mn were set as the central metals. Its enzyme-activated performance ( K m : 0.054 mM and V max : 64.00 μMs −1 ) was superior to most reported materials. Nitrite can diazotize with oxTMB, causing a change in the ratio of absorbance at 652 nm to absorbance at 450 nm (A 652 /A 450 ). Thus, a rapid and sensitive platform for the colourimetric detection of nitrite was established. A portable glass tube hydrogel sensor was designed inspired by the principle of disposable alcohol swabs for the first time to achieve the nitrite monitoring. When the glass tube was cut to introduce TMB and nitrite into the nanoenzymes, a noticeable colour change occurred. Attributed to the high activity of the nanoenzymes and the clever design of the detection device, the proposed method overcame the shortcomings of the traditional sensing methods such as long detection time and poor portability.
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高影响因子
SYNTHETIC METALS
·
2022
·
IF 4
Mengmeng Hou,Huiling Gu,Ji Huang,Hongtao Guan,Shuangxi Xing
In order to develop microwave absorbing materials with strong absorption capacity, wide bandwidth and light weight, three-dimensional (3D) PANI/CeO 2 composite aerogel was prepared by in-situ synthesis method in this work. The CeO 2 nanorods are observed to be interlinked with PANI aerogel to form a porous nanofiber structure. The PANI/CeO 2 composite aerogel exhibits excellent absorption performance with an absorption peak of − 53.68 dB under a moderate thickness of 2.5 mm, and the effective absorption bandwidth (EAB) achieves 4.44 GHz. The excellent microwave absorption performance of PANI/CeO 2 composite aerogel was ascribed to the interfacial polarization relaxation and space charge polarization by virtue of the 3D conductive network. Furthermore, the oxygen vacancy defects arising from the CeO 2 nanostructure also contribute greatly to the microwave absorption.
研究领域:
材料科学
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电磁材料
·
纳米技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.7
Shiyao Lu,Shuning Li,Yancheng Wu,Lin Cheng,Huanyu Li,Miao Wang,Meisheng Liang,Qiaoyan Li
Simultaneous elimination of CO and NO x remains a formidable challenge, largely due to the competitive oxidation reactions present in industrial emission streams. Although much prior research has concentrated on enhancing performance at low temperatures, limited catalytic activity in O 2 -containing environments has recently gained attention as a pressing issue. Herein, we developed an Ir/Si 2 Ce 1 O x catalyst via a SiO 2 -induced structural regulation strategy, which promotes the fine dispersion of CeO 2 and enables the strong anchoring of Ir species. This rational design facilitates the preferential exposure of the active Ir 0 (111) crystal plane, a key factor associated with optimized surface adsorption behavior. Furthermore, the abundant Ir-O-Ce interfaces in this unique architecture induce significant electron transfer from Ce to Ir, thereby stabilizing the metallic Ir 0 . Concurrently, the activated lattice oxygen at the Ir-O-Ce interfaces facilitates the formation of the key nitrate intermediates. Consequently, the catalyst demonstrates outstanding NO reduction and CO oxidation efficiency at 250 °C under oxygen-containing conditions. Our findings highlight a viable approach for stabilizing Ir 0 through tailored Ir Ce interactions, offering a pathway to robust CO-selective catalytic reduction (CO-SCR) performance in an oxidative environment.
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PubMed
高影响因子
Materials Today Chemistry
·
2026
·
IF 7.4
Hailong Zhong,Yachao Huang,Qihong Zhou,Wenqi Feng,Xiaoping Zou,Jinming Zeng,Huan Li,Chao Liu,Xiaopeng Qi
Fabricated a novel CNT catalyst with Ru,Ni nanoparticles encapsulated inside and CeO 2 /RuO 2 heterojunctions outside. • Achieved lower OER/HER overpotentials of 163.9/105.8 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 electrolyte. • Interfacial electron transfer of CeO 2 /RuO 2 heterojunction effectively inhibits Ru overoxidation and dissolution. • Exhibits outstanding bifunctional electrocatalytic performance in both acidic and alkaline water splitting. Proton exchange membrane (PEM) water electrolysis links renewable energy surplus utilization to hydrogen storage—a critical connection enabled by its rapid adaptation to renewable power output swings. Nevertheless, developing bifunctional electrocatalysts incorporating high activity, economic feasibility, and long-term stability remains insufficient for fluctuation-adapted acidic electrolyzers. Herein, we designed and synthesized a bifunctional electrocatalyst (denoted as CeO 2 /RuO 2 /Ru,Ni@CNT), in which Ru and Ni nanoparticles are encapsulated within carbon nanotubes, while CeO 2 /RuO 2 heterojunctions are distributed on the exterior surface. The catalyst was prepared via a combination of calcination, hydrothermal, and annealing processes. Experimental results show the catalyst has excellent bifunctional activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 , with overpotentials as low as 163.9 mV (OER) and 105 mV (HER) at 10 mA cm −2 and good stability. The superior performance stems from the synergistic interactions of multiple factors, including the high dispersion and electrical conductivity of carbon nanotubes, the electronic modulation imparted by internal Ru and Ni nanoparticles, and the interfacial electron transfer at the CeO 2 /RuO 2 heterojunctions. This study establishes a new design direction for high-performance bifunctional electrocatalysts, relying on encapsulation-heterojunction structures, for renewable-coupled acidic PEM electrolysis. Download: Download high-res image (693KB) Download: Download full-size image
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 12
·1-11
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IF 5.3
Tan Suhui,Tan Mengyuan,Zhang Tao,Gao Lu,Li Yi,Xu Xuechao,Yang Zhen-quan
A multienzyme-like L-argininemodified CeO 2 (Arg-CeO 2 ) nanozyme was prepared for accurate total antioxidant capacity (TAC) determination of Ganoderma sichuanense ( G. sichuanense ). It exhibits oxidase-like and peroxidase-like activities catalyzing the generation of superoxide anion free radicals and hydroxyl radicals, accelerating 3, 3′, 5, 5′-tetramethylbenzidine (TMB) chromogenic reaction. Antioxidants can effectively eliminate the generated free radicals, inhibiting the TMB chromogenic reaction. Hence, TAC can be assessed by Arg-CeO 2 catalyzed TMB chromogenic reaction using ascorbic acid (AA) as a reference substance. TAC of G. sichuanense extracted using different solvents was determined, indicating the highest TAC observed in the G. sichuanense extracted by the mixture solvent (deionized water/ethanol/ethyl acetate = 1 : 1 : 1). A visual assessment platform based on Arg-CeO 2 hydrogel nanozyme utilizing a self-programmed smartphone app and a self-designed 3D printed device is established. TAC using AA as a reference substance (3.33 ~ 83.33 µM) can be detected with a detection limit as low as 0.58 µM. The platform can realize one-step quantitative determination of TAC in G. sichuanens e within 40 min. The proposed visual assessment platform presented exhibits promising application prospects in the field of TAC assessment in food. Graphical
研究领域:
食品科学
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生物化学
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材料科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）