CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jiaojie He,Yuhong Xu,Wei Wang,Bo Hu,Zijie Wang,Xin Yang,Yu Wang,Liwei Yang
A series of hierarchical micro/nano Ce-based composites were derived from Ce-MOF via thermal treatment in N 2 atmosphere. Different from conventional complete decomposed materials, forming cerium oxide in air, Ce-MOF that calcinated in N 2 at lower temperatures (400 °C or 500 °C) showed a partial thermal decomposition with high percent content of Ce(III). Even though the complete decomposed products held higher surface areas, the partial decomposed samples exhibited extremely higher phosphate uptake, with working capacity 2–4 times higher than that of ceria. The results implied a predominant effect of different valence states on phosphate removal by Ce-based materials, in which Ce(III) species were demonstrated playing the major role to form binding with phosphate. The maximum adsorption capacity (189.4 mg/g) was achieved by Ce-MOF-500(S) with wide applicable scope of pH ranging from 2 to 12 and great selectivity for phosphate in the presence of competing anions. Remarkably, Ce-MOF-500(S) described obvious enhanced phosphate adsorption ability under alkaline condition. This was due to the fact that the hydrolyzed Ce(III) species brought more active sites in the form of hydroxyl groups for ligand exchange with phosphate. Furthermore, based on the analysis of FTIR, XPS, XRD and zeta potential, electrostatic attraction, ligand exchange and surface precipitation were confirmed as the main adsorption mechanisms for partial decomposed samples, while electrostatic attraction was the main mechanism for complete decomposed samples.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Jiahui Liu,Fangyuan Dong,Yaqi Huang,Yanghe Fu,Xinqing Lu,Rui Ma,Fumin Zhang,Shuhua Wang,Weidong Zhu
Reducing the cost of RuO 2 /TiO 2 catalysts is still one of the urgent challenges in catalytic HCl oxidation. In the present work, a Ce-doped TiO 2 supported RuO 2 catalyst with a low Ru loading was developed, showing a high activity in the catalytic oxidation of HCl to Cl 2 . The results on some extensive characterizations of both Ce-doped TiO 2 carriers and their supported RuO 2 catalysts show that the doping of Ce into TiO 2 can effectively change the lattice parameters of TiO 2 to improve the dispersion of the active RuO 2 species on the carrier, which facilitates the production of surface Ru species to expose more active sites for boosting the catalytic performance even under some harsh reaction conditions. This work provides some scientific basis and technical support for chlorine recycling.
研究领域:
化学工程
·
催化科学
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DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Binghong Song,Caiting Li,Xueyu Du,Shanhong Li,Yindi Zhang,Yue Lyu,Qihao Zhou
A series of Cu-Ce binary oxides were synthesized via a facile co-precipitation method for toluene catalytic oxidation. The physicochemical properties of these samples were characterized by BET, XRD, SEM, TEM, H 2 -TPR, O 2 -TPD, and XPS. It reveals that Cu 1 Ce 3 catalyst possesses a higher specific surface area, stronger Cu-Ce synergistic effect, and better low-temperature reducibility than other samples. Moreover, Cu 1 Ce 3 catalyst exhibited superior toluene oxidation activity with 99.10% toluene removal efficiency and 97.28% CO 2 selectivity at 200 °C, as well as satisfactory stability and moisture resistance. Therefore, Cu 1 Ce 3 catalyst indicates a huge potential for practical applications, such as coal-fired flue gas and spray coating industry. The reaction pathways for toluene catalytic oxidation over the Cu 1 Ce 3 catalyst were further illuminated by in-situ DRIFTs. In the main pathway, toluene molecules were firstly in contact with the interface lattice oxygen, then the abstraction of H atoms occurred on the methyl group, and benzyl alcohol is considered as the primary intermediate, during which the rate-determining step is the oxidation of benzyl alcohol. In the secondary pathway, a little proportion of toluene molecules were directly oxidized into benzoic acid by the chemisorbed oxygen species. In subsequent steps, all the intermediates were converted into CO 2 and H 2 O. At last, it is confirmed that the toluene oxidation over Cu 1 Ce 3 catalyst involves a Mars-van-Krevelen mechanism via this study.
研究领域:
催化化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinyu Yang,Bing Hou,Mingjing Shi,Muhammad Akram,Xinxin Li,Lei Wang,Jingwen Pan
Excessive fluoride (F − ) in water environment is a widespread concern, and economical and efficient adsorption is widely used defluorination technology. In this study, a series of cerium-based adsorbents (Ce@C) with different structural properties were synthetized by adjusting the calcination conditions to explore their effect on the F − adsorption capacity of Ce@C and intrinsic mechanism. Results indicated that the best performing Ce@C had the maximum adsorption capacity (340.71 mg/g) and a wide pH working range (2–12). The adsorption process of F − conformed to the pseudo-second-order model and the Temkin model, proving that F − adsorption onto Ce@C was mainly dominated by chemisorption. Different calcination conditions altered the content of Ce(III) and oxygen vacancies in Ce@C, and their contents exhibited a significant effect on the F − adsorption performance of Ce@C, which showed a strong positive correlation (R 2 = 0.982 and 0.933). Density functional theory (DFT) calculations further proved that the presence of Ce(III) and oxygen vacancies could provide richer coordination numbers to promote the complexation of F − and Ce@C. This work re-reveals the F − adsorption behavior and intrinsic mechanism onto cerium-based adsorbents, and also provides a theoretical basis for the subsequent design of cerium-based adsorbent materials for defluorination.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Peixin Liu,Peng Jing,Xuan Xu,Baocang Liu,Jun Zhang
The electrochemical synthesis of ammonia from N2 under mild conditions is a promising alternative to the energy-consuming Haber–Bosch process. Metal–organic frameworks (MOFs) are promising electrocatalysts for the N2 reduction reaction, but most of them are active for the undesirable and competitive hydrogen evolution reaction. Herein, we developed a facile strategy to grow a Ce-MOF on copper mesh substrate. The Ce-MOF with a self-supporting structure could be directly used as an electrode for the N2 reduction reaction, demonstrating highly efficient electrocatalytic performance with an NH3 yield of 14.83 μg h–1 cm–2 and a Faradaic efficiency of 10.81% at −0.2 V versus a reversible hydrogen electrode. Structural characterizations of Ce-MOF after electrocatalysis revealed that Ce-MOF as precatalyst underwent structural reconstruction at negative potential, forming catalytically active CeO2 with oxygen vacancies embedded in the amorphous Ce-MOF. In addition, the self-supporting structure formed by in situ growth of Ce-MOF on porous and conductive cooper mesh endowed the electrocatalyst with enhanced stability, conductivity, and mass transport. This work demonstrated the structural transformation of Ce-MOF during the electrocatalytic process and provided new insight for the rational design of MOF-based electrocatalysts.
研究领域:
材料科学
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电化学
·
催化反应
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Hang Liu,Bing Liu,Peihua Li,Wenlong Kang,Yuhong Zhang
In this paper, the SnO 2 and Ce/SnO 2 nanomaterials are synthesized through a simple hydrothermal route and used for detecting NO 2 gas . The SnO 2 materials exhibit a good linearity for NO 2 detection, and the limit of detection is calculated to be as low as about 5 ppb at 10% humidity. The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications . The NO 2 gas sensing response of SnO 2 and Ce/SnO 2 also are investigated at 50% humidity. The Ce/SnO 2 materials show higher response than pure SnO 2 . The gas sensing mechanism of Ce/SnO 2 material is discussed in detailed. The reach results provide a new way for increasing the anti-humidity of the metal oxide semiconductor gas sensor.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Fengshun Du,Bohua Duan,Dezhi Wang,Zhuangzhi Wu,Xinli Liu
Improving the poor plasticity and fracture toughness of molybdenum alloys is the key to expanding their industrial applications. In this experiment, a cerium partially stabilized zirconia (Ce-PSZ) reinforced molybdenum alloy with outstanding properties was obtained by combining the hydrothermal method and the powder metallurgy technology. This study investigated how varying Ce-PSZ content influences the microstructure and mechanical properties of Mo/Ce-PSZ alloys. The results show that with increasing Ce-PSZ addition, the relative density and hardness of the alloys gradually increase, while the tensile strength, plasticity, and fracture toughness exhibit a tendency to initially increase and subsequently decrease. When 1.5 wt% of Ce-PSZ is added, the Mo alloys achieve excellent overall mechanical properties, with an ultimate tensile strength of 528.5 MPa, elongation of 29.3 %, and fracture toughness of 38.5 MPa∙m 1/2 . These values are about 22.7 %, 22.5 %, and 83.3 % higher than those of pure molybdenum. The substantial enhancement in elongation and fracture toughness can be predominantly ascribed to the refinement of grains and the stress-induced Ce-PSZ phase transformation. This research provides a novel method for the preparation of molybdenum alloys with high fracture toughness and elongation.
研究领域:
材料科学
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冶金工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Shaoyan Huang,Jinbao Li,Na Li,Huijuan Xiu,Xuanchen Jiang,Sha Fan,Zili Deng,Deliang Tian,Haiwei Wu,Bin Yang,Meiyun Zhang
The performance of lithium-sulfur batteries (LSBs) is constrained by the shuttle effect of lithium polysulfides (LiPSs), the sluggish conversion kinetics of LiPSs, and high reaction barrier during Li 2 S deposition/dissolution. In this study, MXene is innovatively incorporated into the synthesis of Ce Metal-organic framework (Ce-BTC) for heterogeneous modification, resulting in a novel nanorod-shaped MXene-Ce-BTC materia. This material possesses more metal sites and functional groups, which not only facilitate the formation of surface defects and increase oxygen vacancies but also enhance the adsorption of LiPSs, thereby promoting their rapid conversion. Finally, MXene-Ce-BTC is incorporated into the prepared paper-based self-supporting cathode and subsequently assembled into LSBs, demonstrating remarkable electrochemical performance: it achieves an initial discharge specific capacity of 1195 mA h g −1 at a sulfur loading of 3.5 mg cm −2 and a current density of 0.2C. After 200 cycles, the capacity is 1148 mA h g −1 , with a retention rate of 96.1 %. Even at a high sulfur loading of 8.5 mg cm −2 , it delivers an initial specific capacity of 532 mA h g −1 , with a retention rate of 90.7 % after 100 cycles. This study develops a simple yet efficient MXene-Ce-BTC cathode material, offering novel insights into the design of cathode catalysts.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·2045-2055
·
IF 2.482
Li Chaoqun,Yang Yang,Ren Wei,Wang Jian,Zhu Tingyu,Xu Wenqing
Abstract CO is toxic and detrimental to human beings and the atmosphere. The presence of CO has become one of the important indicators for evaluating ambient air quality. Iron and steel sintering generate large amounts of flue gas emissions containing approximately 1% CO, which has become an important factor restricting the improvement of air quality in steel cities. The catalytic oxidation method is the simplest and most effective method for CO emission control. In this work, a series of Cu x Ce y /TiO 2 catalysts with different Ce doping levels were prepared by a one-step impregnation method and subsequently tested for catalytic CO oxidation. The Cu 0.5 Ce 0.5 /TiO 2 sample has the best catalytic activity under the conditions of 1% CO and 10% H 2 O. The catalysts were next characterized by XRD, BET, TEM, H 2 -TPR, XPS and in-situ DRIFTS methods. The characterization results show that Ce doping promotes the dispersion of copper species on the catalyst surface and improve the redox performance of the catalyst. The results of in-situ experiments showed that both Cu/TiO 2 and Cu 0.5 Ce 0.5 /TiO 2 catalysts followed Mars and van Krevelen mechanism, and Ce doping enhanced the adsorption and activation of oxygen, thus improving the low-temperature reaction activity of the catalysts. Graphic Abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Chemical Science
·
2018
·Vol. 9
·期 14
·3426-3437
·
IF 9.063
Xinyu Li,Zhi-Jian Zhao,Liang Zeng,Jiubing Zhao,Hao Tian,Sai Chen,Kang Li,Sier Sang,Jinlong Gong
La2O3 exhibits good performance for various catalytic applications, such as oxidative coupling of methane (OCM) and dry reforming of methane (DRM), during which coke formation may lead to the deactivation of catalysts. Typically, the reaction between CO2 adsorbed on La2O3 and coke is the rate-determining step of the coke elimination process. This paper describes the influence of Ce addition on the CO2 adsorption and activation over La2O3. Combined with in situ and ex situ characterization and density functional theory (DFT) calculation, we show that Ce addition promotes the formation of bidentate carbonate on La2O3via tuning CO2 adsorption energy. In addition, Ce addition adjusts the ratio of bidentate/monodentate carbonate, and affects the ratio of hexagonal/monoclinic La2O2CO3 on the binary oxides. DRM is used as a probe reaction to examine the coke elimination performance of Ce–La binary oxide. It is found that when the Ce/La ratio reaches the optimal value (0.15), Ce–La binary oxide has the highest CO2 adsorption energy and predominantly promotes the formation of bidentate carbonate, and hence possesses the highest basicity above 700 °C and finally exhibits the best coke elimination performance.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Xin Guo,Zhiyong Ding,Na Kang,Liu Yang,Yuanjiang Wang,Cheng Zhang,Zhaoqiang Li,Tiantian Zhang,Yan Wang,Yu Wang,Hao Qu
The zeolite-based catalyst is a promising option for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) due to its low toxicity. However, the challenge lies in its low-temperature activity. This study developed a multi-component catalytic system consisting of Ce/Mn/Cu-loaded Beta zeolite to reduce NO x . With fixed contents of Cu and Mn, we investigated the NH 3 -SCR process and the mechanism of action of the rare-earth species (i.e., Ce) in the system. Upon optimization of the content of Ce, the Ce/Mn/Cu-loaded Beta zeolite demonstrated enhanced low-temperature activity compared to samples loaded with Cu or Cu/Mn in the temperature range of 150–250 °C. When Ce was loaded in an appropriate proportion, it regulated the oxidation state of Cu, optimizing active adsorption species for NO and strengthening the strength of Brønsted acid sites in the catalyst. These synergetic effects led to improved NH 3 -SCR catalytic performance. This study can contribute to a better understanding of multiple metal-loaded zeolites in the NH 3 -SCR process and inform future design of Beta-type catalysts.
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
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2017
·
IF 3.743
Xiong Pan,Saige Wang,Nan Shi,Hua Fang,Yunlong Yu
The application of the herbicide chlorimuron-ethyl has a lasting toxic effect on some succession crops. Here, a bacterium capable of utilizing chlorimuron-ethyl as the sole source of nitrogen was isolated from the contaminated soil and was identified as Enterobacter ludwigii sp. CE-1, and its detoxification and degradation of the herbicide were then examined. The biodegradation of chlorimuron-ethyl by the isolate CE-1 was significantly accelerated with increasing concentration (1–10 mg/l) and temperature (20–40 °C). The optimal pH for the degradation of chlorimuron-ethyl by the isolate CE-1 was pH 7.0. A pathway for the biodegradation of chlorimuron-ethyl by the isolate CE-1 was proposed, in which it could be first converted into 2-amino-4-chloro-6-methoxypyrimidine and an intermediate product by the cleavage of the sulfonylurea bridge and then transformed into saccharin via hydrolysis and amidation. The plant height and fresh weight of corn that had been incubated in nutrient solution containing 0.2 mg/l of chlorimuron-ethyl significantly recovered to 83.9% and 83.1% compared with those in the uninoculated control, although the root growth inhibition of chlorimuron-ethyl could not be alleviated after inoculation for 14 d. The results indicate that the isolate CE-1 is a promising bacterial resource for the biodegradation and detoxification of chlorimuron-ethyl.
研究领域:
环境科学
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微生物学
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植物生理学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）