TALANTA
·
2026
·
IF 6.1
Chuanxuan Zhou,Shaowei Li,Ziyi Zhang,Dousheng Han,Fuchao Yang
The ultimate optimization of natural systems in terms of “structure-function-environment adaptation” can provide inspiration for the design of advanced materials. Considering the urgent demand for efficient detection of 2-butanone in industrial safety and environmental monitoring, and the limitations of existing WO 3 -based gas sensors including low response intensity and poor selectivity, this research focuses on developing modified WO 3 -based composite materials with enhanced gas sensing performance using natural biological templates. In this work, an immersion process combined with calcination technology was employed to successfully replace the biosensitive scaffolds on pollen grains with gas-sensitive CeO 2 /WO 3 composites. This material exhibits outstanding response to 2-butanone at 185 °C, significantly surpassing the undoped sample while maintaining high selectivity. The outstanding sensing performance is attributed to its unique hierarchical structure and the synergistic effect of the CeO 2 /WO 3 heterostructure. This study provides a new perspective for us to explore low-cost gas sensors with natural biological morphologies and opens up new possibilities for expanding the applications of WO 3 -based composites.
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产品关联
DOI
PubMed
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Bowen Lu,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
The interfacial structure of metal and oxide support plays a pivotal role in reverse water gas shift (RWGS). However, rare work investigated the factor of the metal-oxide interface during RWGS reaction. In this work, the interface of Cu/CeO 2 catalysts was designed through the thermal treatment of copper nitrate salt on CeO 2 with an H 2 atmosphere under different temperatures, and CO 2 hydrogenation performance was studied at 400 °C to investigate the effect of interfacial structure on RWGS reaction. Among these prepared catalysts, Cu/CeO 2 -400 catalysts achieved the best CO 2 conversion activity (CO production rate 1.23 mol/g cat . h). Cu interacted with CeO 2 to form Cu-O-Ce interface and induced more oxygen vacancy formation. The oxygen vacancy around the Cu-CeO 2 interface enhanced CO 2 adsorption and promoted CO 2 conversion. CO 2 reacted with active hydrogen to COOH, then COOH species dissociated into CO and OH adsorbed on the surface of Cu-CeO 2 . These results gave insights into the design of a highly effective catalyst for CO 2 hydrogenation.
研究领域:
催化化学
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材料科学
·
能源化学
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DOI
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Peng Zhao,Nengjie Feng,Bangjie Tan,Zhuobin Huo,Geng Liu,Hui Wan,Guofeng Guan
The exposed crystal facets are crucial to heterogeneous catalysis . Herein, the facet controlled Ce 1−x La x O δ (0 ≤ x ≤ 0.30) nanocomposites have been constructed elaborately via a hydrothermal route and used for soot abatement. The catalysts were characterized by XRD , TEM, Raman, FT-IR, XPS , H 2 -TPR, and so forth. With the increasing content of La 3+ , part of CeO 2 crystals transformed from nanocubes to nanorods , inducing distinct effects on the catalytic activity . When the concentration of La 3+ was lower than 10 %, the exposed facet in the catalyst was (200). After La 3+ were further introduced, the facet degraded to (111). La 3+ at low concentration would enhance activity by facilitating lattice oxygen delivery and inducing abundant surface oxygen species, especially O - , which were vital to surface sensitive soot oxidation . Nevertheless, excessive La 3+ ions would inhibit CO 2 desorption due to the generation of La 2 O 2 CO 3 , a strong alkali as a result of phase separation. Among all the catalysts, Ce 0.95 La 0.05 O δ showed the best catalytic performances for soot combustion, with T 50 of 375 °C.
研究领域:
材料化学
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环境催化
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纳米材料
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能源化学
·
表面科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23230-23239
·
IF 7.443
Chenhao Du,Yun Guo,Yanglong Guo,Xue-qing Gong,Guanzhong Lu
Developing methods for the fabrication of active and thermally stable noble metal/metal oxide nanomaterials are very important for catalysis and material fields. Herein, we used a polymer-template synthesis approach to prepare hollow Pd–CeO2 nanocomposite spheres (NCSs) with Pd nanoparticles evenly distributed inside the CeO2 shell, in which the aggregation of Pd nanoparticles can be well inhibited with the help of the protection of CeO2 nanocrystallites even after being calcined at 700 °C. The Pd nanoparticles are partially buried in the CeO2 shell and the surface Pd species are highly ionic, which is caused by the electron exchange at the Pd–CeO2 interface during calcination. This hollow structure Pd–CeO2 nanocatalyst shows excellent catalytic activity and stability in the aqueous selective reduction of 4-nitrophenol and gaseous CO oxidation. For the selective reduction of 4-nitrophenol, the reaction rate of this h-Pd–CeO2 NCS catalyst compared to those of the supported Pd/CeO2 and physically mixed Pd + CeO2 catalysts is almost 14 times and 5 times faster, respectively. For the CO oxidation, the larger Pd–CeO2 interface in h-Pd–CeO2 NCSs could facilitate the reaction between the adsorbed CO and O2, thus showing better low temperature activity. This paper emphasizes the advantages of a core–shell hollow structure and provides a new way for obtaining novel functional nanocatalysts.
研究领域:
材料化学
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纳米催化
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无机功能材料
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环境催化
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能源材料
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DOI
高影响因子
Progress in Natural Science-Materials International
·
2012
·Vol. 22
·期 4
·265-272
·
IF 1.099
Lei Chen,Duan Weng,Zhichun Si,Xiaodong Wu
WO 3 –CeO 2 –TiO 2 catalysts for NO (nitrogen monoxide) reduction by ammonia were prepared by a sol–gel method. The catalysts were characterized by BET, XRD, Raman, NH 3 /NO adsorption and H 2 -TPR to investigate the relationships among the catalyst composition, structure, redox property, acidity and deNO x activity. WO 3 –CeO 2 –TiO 2 catalysts show a high activity in a broad temperature range of 200–480 °C. The low-temperature activity of catalysts is sensitive to the catalyst composition especially under low-O 2 -content atmospheres. It may be related to the synergistic effect between CeO x and WO x in the catalysts. On one hand, the interaction between ceria and tungsten oxide promotes the activation of gaseous oxygen to compensate the lattice oxygen consumed in NH 3 -SCR (selective catalytic reduction) reaction at low temperatures. Meanwhile, the Brønsted acid sites mainly arise from tungsten oxides, Lewis acid sites mainly arise from ceria. Both of the Brønsted and Lewis acid sites facilitate the adsorption of NH 3 on catalysts and improve the stability of the adsorbed ammonia species, which are beneficial to the NH 3 -SCR reaction.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·Vol. 46
·期 43
·22508-22518
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IF 5.816
Zhijun Zhang,Kezhen Chen,Jichang Lu,Qin Zou,Yuhui Zhao,Yongming Luo,Dedong He,Rongtao Li
Sn modified CuO–CeO 2 catalysts with different Sn loadings were prepared by a facile, green and solvent-free method. The effect of Sn/Ce ratio over Sn–Cu–Ce-x (x = 0, 1, 2.5, 5, 7.5) samples on CO activity and O 2 selectivity was investigated. The samples were characterized by various techniques using N 2 -adsorption/desorption, XRD , H 2 -TPR, XPS, Raman and in-situ DRIFTS . It was revealed that stronger interaction between acitve sites and support, higher amounts of Sn 2+ and Ce 3+ , associated with increased amount of oxygen vacancies , were observed on the catalyst of Sn–Cu–Ce-5. As a result, the optimized catalyst displayed an excellent catalytic performance even in the presence of CO 2 and H 2 O. In this sense, probing the Sn modified CuO–CeO 2 catalyst can elucidate some useful keys for the development of high CO 2 and H 2 O-resistance catalyst during CO-preferential oxidation in H 2 -rich streams.
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DOI
高影响因子
SCRIPTA MATERIALIA
·
2018
·
IF 4.163
Lili Guan,Jian Li,Xiwen Song,Jinxiao Bao,Tao Jiang
Flash sintering of Sm 2 O 3 doped CeO 2 ceramics can be triggered at 25 °C due to the presence of graphite. The current density rise non-linearly to a set limit value in the voltage control stage under an initial electric field of 30 V cm −1 . The calculated conductivity activation energy in this stage is 0.30 eV, which is closely in relation to the electronic conduction of graphite. As graphite is beginning to oxidize, the conductivity of the sample rapidly decreases. While graphite has been completely oxidized, the specimen temperature provides adequate support for the persistence of flash sintering process .
研究领域:
材料科学
·
陶瓷
·
固体离子学
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电场辅助烧结
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DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Zhangfeng Shen,Qineng Xia,Yaguang Li,Chaochuang Yin,Zhigang Ge,Xi Li,Yangang Wang
Direct converting of CO 2 to valuable fuels via solar-powered photoreduction is a promising “green chemistry” route. The key issue for this approach is the exploitation of low-cost and high-efficiency photocatalysts. Here, a novel nanoflakelet-constructed nitrogen-doped CeO 2 with relatively ordered mesostructure (NMCe) is prepared through a facile and cheap urea-assisted template method. In comparison with nanocasted ordered mesoporous CeO 2 (OMCe) with the similar textural properties, the NMCe shows improved CO 2 adsorption ability and has lowered band gap energy, higher surface Ce 3+ concentration and more surface oxygen vacancies. Owing to these characteristics, the NMCe exhibits considerably enhanced photocatalytic performance for visible-light-driven reduction of CO 2 , where the yields of CO and CH 4 are 2.5-fold higher than those on OMCe.
研究领域:
材料科学
·
光催化
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环境化学
·
能量转换
·
纳米材料
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DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 46
·7108-7113
·
IF 3.382
Lingling Li,Yu Liu,Qishun Wang,Xuan Zhou,Jian Li,Shuyan Song,Hongjie Zhang
A CeO2-supported Au nanohybrid is regarded as a promising catalytic system for CO oxidation, but its unsatisfactory catalytic activity and high cost are still challenges for sustainable application. In this work, we have synthesized a series of low loading and high activity Au/CeO2 supported catalysts using a coprecipitation method. Au/CeO2 catalysts with a low Au content (0.2 wt%) showed extremely high activity for CO oxidation with 100% conversion of CO around 60 °C. The key to the success is that the unique oxygen-deficient structure of cerium oxide can capture gold to provide a strong synergistic effect between the metal and the support. The content of gold in their oxidation states (Au+1, Au+3) present in the catalyst is one of the important factors affecting the catalytic activity. Furthermore, all of the prepared catalysts present a high BET surface area of roughly 140 m2 g−1. This high specific surface area provides adequate adsorption sites for CO. Moreover, the low loading of Au is critical to reducing the cost of noble metal-based catalysts and making them practical for industrial applications.
研究领域:
催化化学
·
材料科学
·
环境化学
·
表面科学
·
纳米技术
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DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Shiwei Ma,Shiyi Chen,Ahsanullah Soomro,Wenguo Xiang
Fe2O3 is an excellent active metal oxide for chemical looping hydrogen generation (CLHG) with high conversion of CO to CO2 in the reduction stage, and high H2 mole fractions in the subsequent steam oxidation stage, especially for its low cost and abundance in nature. However, supports are generally used to improve its reactivity and stability and to eliminate its carbon deposition. In this paper, Fe-based oxygen carriers are prepared by a coprecipitation method with three supports, i.e., CeO2, ZrO2, and Al2O3. The reactivity, carbon deposition, redox stability, and sintering characteristics of the oxygen carriers are analyzed to investigate the effects of supports as well as the fundamental mechanism. The results show that the properties of the oxygen carriers highly rely on the support and its interaction with iron oxide. The oxygen carrier supported on Al2O3 exhibits poor reactivity and stability, and the oxygen carrier supported on ZrO2 leads to much carbon deposition, decreasing H2 purity, despite its high reactivity and stability. Nevertheless, the oxygen carrier supported on CeO2 demonstrates good reactivity and stability with no carbon deposition observed, and the reducible support CeO2 counteracts the negative effect originating from sintering and guarantees the reactivity and stability of Fe2O3/CeO2 due to its oxygen mobility property and the oxygen mobility enhancement originating from the formation of Fe–Ce solid solution and perovskite-type CeFeO3. Overall, the reducible CeO2 is a potential support to improve the redox characteristics of iron oxygen carrier in CLHG, and the Fe2O3/CeO2 exhibits the highest reactivity at 850 °C. In addition, all three oxygen carriers are characterized by scanning electron microscopy images, energy dispersive X-ray spectrometer analysis, and X-ray diffraction patterns before and after the redox cycles.
研究领域:
能源技术
·
材料科学
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2026
·
IF 5.1
Fengyang Jing,Shimeng Chang,Xingyu Zhang,Chen-Liang Zhou,Yao Weng,Xuewei Li,Hongmei Ye,Yuting Sun,Jiuyang Lin,Wenyuan Ye,Wenjing Yuan
In this study, double S-scheme heterojunctions were constructed by a simple hydrothermal and calcination method, accompanied by the special layered structure of BiOIO3 employed for its I- modification. This resulted in the formation of CeO2/[Bi6O6(OH)3](NO3)3·1.5H2O (BHN)/I--BiOIO3, which possesses double S-scheme heterojunctions. The improvement of photocatalytic degradation efficiency is derived from the result of the synergistic effect of double S-scheme heterojunctions and I- modification. In photocatalytic degradation experiment with norfloxacin as the target pollutant, the degradation efficiency of typical sample (CeO2/BHN/I--BiOIO3-2) reaches 97.50%, which is 9 times and 1.6 times than that of pure CeO2 and BHN/BiOIO3, respectively. Obviously, the CeO2/BHN/I--BiOIO3 double S-scheme heterojunctions significantly enhances its photocatalytic degradation ability of antibiotics in comparison to single-substance photocatalysts and simple two-phase composite. It is noteworthy that the CeO2/BHN/I--BiOIO3 double S-scheme heterojunctions are also capable of achieving a degradation rate of up to 70% for norfloxacin in river water. Furthermore, this double S-scheme heterojunctions demonstrate the degradation efficiencies of approximately 90% for quinolone antibiotics, including ofloxacin, enrofloxacin, ciprofloxacin, and norfloxacin. This research offers a novel approach to enhance the photocatalytic degradation of organic pollutants through double S-scheme heterojunctions and elemental modification.
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产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 1
·
IF 4
Siru Chen,Yiwen Chen,Jun Yin,Guocheng Deng,Jie Xu,Fei Wang,Bing Xue
The conversion of CO2into value-added chemicals exemplifies an innovative and eco-friendly approach to addressing carbon emissions. In this study, shape-specific CeO2nanocrystals (nanorods, nanocubes, and nanoparticles) were successfully synthesized and employed as catalysts to study the structure-dependent behavior and reaction mechanism for one-step CO2conversion to diethyl carbonate (DEC). Among the three catalysts, CeO2nanorods (Ce-NR) exhibited the best catalytic activity in the synthesis of DEC from CO2compared with CeO2nanocubes (Ce-NC) and nanoparticles (Ce-NP), which achieved the DEC production of 1.32 mmolDEC/gcatat 423 K and 5 MPa for 4 h. Comprehensive characterization further confirmed the enhanced activity of Ce-NR originated from the morphology effect, particularly the promotion of oxygen vacancies and Ce3+species, which promoted reaction activity. Furthermore, the Ce-NR catalyst almost retained 1.32 mmolDEC/gcatDEC production of its initial activity after four cycles, underscoring its exceptional stability and promising industrial scalability. These findings provide fundamental insights to guide the rational design of efficient catalysts for CO2activation and other critical transformations.
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产品关联
DOI
高影响因子
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