Processes
·
2024
·Vol. 12
·期 9
·1912
·
IF 2.8
Bowen Lu,Huiying Sang,Liang Liu,Zhijian Yu,Yaqin Guo,Yongqing Xu
The catalytic applications of micron Cu powder are limited due to its large particle size and small specific surface area. Modifying micro-Cu powder to achieve a high catalytic performance is a challenge in the application of micron copper. In this work, micro-Cu was used to synthesize a CeO2–Cu catalyst, and the phase composition and surface pore structure were analyzed using XRD, BET, etc. The CO2hydrogenation performance of the CeO2–Cu catalyst was analyzed in comparison with CeO2and Cu, and we found that the CeO2–Cu catalyst exhibited a synergistic effect between Cu and cerium, resulting in a much higher hydrogenation performance at 500 °C than CeO2or Cu alone. H2-TPR and TEM characterization revealed that the CeO2–Cu catalyst formed interfacial interactions with a relatively large Ce–Cu interface, where cerium oxide could promote the reduction of CuO and lower the reduction temperature. Additionally, cerium oxide formed a confinement structure for Cu, and the CeO2–Cu catalyst exhibited a higher oxygen vacancy concentration, thereby promoting the CO2hydrogenation performance. Cu–CeO2interaction provides valuable insights into the catalytic application of micron Cu powder.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 102
·99842-99850
·
IF 3.289
Kun Zhang,Xu Zhang,Tianwei Tan
In this study, the conversion from Botryococcus braunii liquid to bio-jet fuel via a Ru/CeO2 catalyst was conducted. At first, novel Ru/CeO2 catalysts were prepared in order to increase the catalytic activity. “Ru/CeO2-alcohol thermal” showed the highest activity: the squalane conversion exceeded 90%, an increase of about 22% in comparison with “Ru/CeO2-impregnation”. When the B. braunii liquid was used as the raw material, no obvious catalytic activity was noticed. Therefore, the influence of impurities in the B. braunii liquid on the Ru/CeO2 reaction were preliminarily analysed, confirming that the pigments (such as β-carotenoid) and the oxygen compounds (such as fatty acids) were the main factors influencing the Ru/CeO2 reaction. Based on these results, the reaction process was optimized: prolonging the reaction time and pretreating the B. braunii liquid with H2. Finally, the production of bio-jet fuel over Ru/CeO2 was successfully achieved.
研究领域:
生物技术
·
催化化学
·
可再生能源
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2024
·
IF 5.4
Lichao Zuo,Yuanyuan Bao,Ke Wu,Shujing Li,Zhaohui Qu,Yongbo Lyu,Xiaozhen Li,Hong Meng,Yifan He
The increasing prevalence of antibiotic-resistant bacteria is regarded as one of the worst threats to the environment and global health, and antimicrobial nanomaterials have been increasingly explored to provide solutions for antimicrobial resistance problems. In this paper, mesostructured Zn-doped CeO 2 hollow spheres (ZDCHS) with various Zn/Ce ratios were successfully prepared by a conventional one-pot hydrothermal synthesis method. The ingenious incorporation of Zn playing a vital role in the fabrication of hollow structure of ZDCHS with high specific surface area, and detailed transmission electron microscopy (TEM) characterization confirmed the homogeneous distribution of Zn element across the ZDCHS. The X-ray photoelectron spectroscopy (XPS) and Raman results indicated that a higher concentration of oxygen vacancies was obtained on the ZDCHS compared to the undoped CeO 2 counterparts. In addition, the in vitro antioxidant properties evaluated toward scavenging DPPH radicals, hydroxyl radicals and superoxide radicals further revealed the enhanced antioxidant activity of ZDCHS derived from the doping with Zn ions. Furthermore, the bacteriostatic assay against Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria showed that the ZDCHS possessed synergistically improved bacteriostatic performance and were more susceptible to S. aureus with a maximal antimicrobial ratio of 99.5 %, which is higher than that of the undoped CeO 2 samples (80.7 %). These results represent a new paradigm to the design of novel hollow-structured materials, highlighting the doping of Zn ions in the lattice structure of CeO 2 provides a feasible means for the preparation of effective antioxidants and antimicrobial agents.
研究领域:
材料科学
·
微生物学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Zewei Jia,Shangbo Ning,Yuxin Tong,Xin Chen,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO2 conversion has been attracting extensive attention. In this work, Ni nanoparticle-loaded N-doped CeO2 (Ni/N-CeO2) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N5.0-CeO2 exhibited a CO yield rate of 20.9 mmol·gcat–1·h–1 with almost 100% of CO selectivity via photothermal CO2 reduction. As a comparison, Ni/CeO2, without nitrogen doping, showed a high CH4 selectivity. The strong light absorption of Ni/N5.0-CeO2 mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO2 molecules due to increased oxygen vacancies in N5.0-CeO2 by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N–H bonds, which could modulate the reaction pathway for promoting the reduction of CO2 toward CO while suppressing the undesirable CO2 methanation process.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 16
·3382-3390
·
IF 8.928
Ting Feng,Jing Ding,Haiyan Li,Wei Wang,Bohua Dong,Lixin Cao
Graphical In hot water : CeO 2 /A−Fe(OH) 3 composites synthesized by a secondary water bath at 100 °C exhibit superior photocatalytic activity. A−Fe(OH) 3 increases specific surface area, passivates the surface of CeO 2 , and reduces the activation energy of water oxidation. This work provides a new insight into exploring amorphous cocatalysts to enhance photocatalytic O 2 evolution activity and augment the possibility of overall water splitting based on CeO 2 . Noble-metal-free composites with good photocatalytic property are of great interest. Here, CeO 2 nanorods composites loaded with amorphous Fe(OH) 3 cocatalyst were designed and prepared via a secondary water bath at 100 °C. The as-synthesized CeO 2 /amorphous Fe(OH) 3 composites exhibited superior light photocatalytic activities compared to pure CeO 2 , especially the sample with a loading time of 60 min. The photocatalytic oxygen generation rate could reach to 357.2 μmol h −1 g −1 , and the average apparent quantum yield (AQY) was 24.67 %, which was a 5.5-fold increase compared to the CeO 2 sample. The improvement of photocatalytic performance could be ascribed to three main reasons: First, loading the amorphous Fe(OH) 3 enlarged the specific surface area and passivated the surface of the pristine CeO 2 . Second, the amorphous Fe(OH) 3 ,which acted as a cocatalyst, provided many active sites, and reduced the reaction activation energy. Thirdly, the maximum interface with intimate contact between CeO 2 and amorphous Fe(OH) 3 cocatalyst accelerated the photogenerated charge separation efficiency and thus improved the photocatalytic performance of CeO 2 in photocatalytic water oxidation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yafei Guo,Guodong Wang,Xi Yao,Bingqian Liu
Several NiO–CuO–CeO 2 catalysts were prepared via different methods and characterized by different techniques. Structure-activity relationships of the catalysts were demonstrated, and the effect of preparation methods on CO oxidation behaviors was illustrated. Catalytic results evidenced that the NiCuCe-CP and NiCuCe-SG catalysts prepared by co-precipitation and sol-gel methods exhibited better CO oxidation activities and kinetic performance, as evidenced by their lower T 50 values (102 °C and 100 °C) and apparent activation energies (48.80 and 59.28 kJ/mol) as well as higher reaction rates (3.84 and 3.45 μmol/g/s). The XRD and HRTEM results suggested that the active species showed uniform dispersion with minimum crystallite size in the desired catalysts. The XRD, XPS , H 2 -TPR and Raman analysis suggested the formation of Ce 1- x Cu x O 2- δ and Ce 1- x Ni x O 2- δ solid solutions, indicating that the co-precipitation and sol-gel methods reinforced the interactions amongst the ternary metal oxides . This would afford the catalysts more oxygen vacancies for boosted CO oxidation activity. The mechanism was then proposed with the dual synergetic effects in solid solutions for facilitated oxygen mobility and the amorphous active metal oxides for promoted CO chemisorption . The desired NiCuCe-CP and NiCuCe-SG catalysts show potential application for CO abatement in closed-loop air revitalization.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 7
·2923-2931
·
IF 4.569
Yikang Cong,Xingnan Chen,Yan Mei,Jun Ye,Ting-Ting Li
To realize electrocatalytic water splitting for hydrogen production, the development of efficient and durable anode materials containing earth-abundant elements is of great significance. In this work, we demonstrate a novel heterostructure with easily depositing CeO2 nanoparticles on the surface of the metal–organic framework (MOF)-derived Co0.4Ni1.6P nanowire arrays. Such an interface engineering strategy triggers the formation of abundant oxygen vacancies and provides more electrocatalytically active sites. Besides, the synergistic effect in this composite can regulate the electronic structure, and lead to an enhanced charge-transfer ability. Benefiting from the above superiorities, this heterostructure exhibits remarkable electrocatalytic performance towards the oxygen evolution reaction (OER) in 1 M KOH electrolyte, requiring overpotentials (η) of 268 and 343 mV to yield current densities of 10 and 100 mA cm−2, respectively, accompanied by a low Tafel slope of 79.3 mV dec−1. Furthermore, the electrocatalytic performance of this heterostructure for the OER in simulated alkaline seawater (1 M KOH + 0.5 M NaCl) was also studied, and it achieved low η values of 345 and 394 mV to drive 100 and 200 mA cm−2, respectively. This work presents a simple approach to fabricate heterostructural electrocatalysts with CeO2 nanoparticles for high-performance water/seawater electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Chunqiang Lu,Rongrong Deng,Ruidong Xu,Yannan Zhao,Xing Zhu,Yonggang Wei,Kongzhai Li
Chemical looping combustion (CLC) is a novel technology that offers effective CO 2 capture and power generation, which strongly relies on the properties of oxygen carrier. Here, a new type of CeO 2 /MnCo 2 O 4 oxygen carrier was prepared by dispersing CeO 2 nanoparticles on MnCo 2 O 4 microspheres for CLC of methane. The results reveal that the pure MnCo 2 O 4 shows high activity for methane combustion (methane conversion is as high as 94% at 800 °C), but the methane conversion sharply decreases to lower than 40% after 20 redox cycles, indicating poor redox stability. The presence of CeO 2 on MnCo 2 O 4 microspheres significantly improves the redox stability, which is benefited from the partial incorporation of high valence Ce 4+ cations into the MnCo 2 O 4 lattice that results in the generation of abundant oxygen vacancies due to the charge balance. Among different xCeO 2 /MnCo 2 O 4 samples, the 10% CeO 2 /MnCo 2 O 4 shows the highest stability during the successive CLC testing either in the capacity for CH 4 combustion or in the aspect of structure, which shows a capacity for CH 4 combustion at 2.22 mmol/g and the average CH 4 conversion higher than 90% on the stable state. Kinetic analysis indicates that the reduction process of recycled 10%CeO 2 /MnCo 2 O 4 can be divided into two steps (the main reduction of Co and Mn oxides, respectively) based on apparently different reaction rates, and both the two steps can be mainly described by a 1D growth of nuclei model. The activation energy for step 1 and step 2 are 32.34 kJ/mol and 88.54 kJ/mol, respectively.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Bin Du,Nanqing Chen,Guodong Zhang,Yun Chen,Bin Gao,Liqing Liu,Yushun Zhao
Fluorinated graphene oxide@CeO 2 (FGO@CeO 2 ) was synthesized using an in-situ growth method and incorporated as a filler into epoxy resins to improve their UV aging resistance. On UV irradiation, it facilitated the surface enrichment of the modified epoxy resin (MEP), forming a UV-blocking layer. Incorporating FGO@CeO 2 induced n→π* electronic transitions within the MEP and lowered the electronic excitation threshold, expanding the UV spectral absorption band and enhancing the UV absorption intensity. A 785% increase in the UV absorption capacity was achieved in the MEP compared with that in the pristine epoxy resin. After 300 h of UV exposure, the photothermal temperature rise in the MEP was 13.67 ± 2 °C higher than that in pure epoxy resin.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ruoyu Deng,Qiang He,Dongxu Yang,Qi Dong,Jiali Wu,Xiangyu Yang,Yi Chen
Dielectric barrier discharge (DBD) is an attractive advanced oxidation process (AOP) due to its operational convenience and environmental friendliness. However, DBD plasma suffers from relatively low energy utilization, which limits its commercial application. In this study, nano-Fe 0 -CeO 2 is successfully synthesized and used for DBD plasma degradation of diclofenac (DCF). The results show that the nano-Fe 0 -CeO 2 significantly enhances the removal of DCF. A DBD-Fe 0 -CeO 2 system degrades 96.4% DCF within 10 min, which is higher than the DBD system alone (45.8%). The synergistic factor of the DBD system and nano-Fe 0 -CeO 2 reaches 3.731. In addition, the composite catalyst shows ideal reusability. Substance activity and production experiments show that reactive oxygen species (ROS), especially OH, play a key role in the degradation of DCF. Nano-Fe 0 -CeO 2 has synergistic effects with O 3 and H 2 O 2 and significantly promotes the generation of ROS in the DBD system. Based on the intermediates detected by liquid chromatography-mass spectrometry, a reasonable degradation pathway of DCF is proposed. Our findings are helpful for understanding the mechanism of DCF degradation by coupling nano-zero-valent-iron-based nanocomposites in a DBD system; they also provide an effective system for the treatment of refractory organic pollutants in water.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yu Fan,Bowen Lu,Xinyu Zhi,Cong Luo,Liqi Zhang
NiFe 2 O 4 exhibits excellent redox properties and is widely applied in CaO-NiFe 2 O 4 chemical looping processes. However, rapid sintering of Ni-Fe alloy under reaction conditions limited its industrial applications. The CeO 2 -NiFe-CaO were synthesized through a physical mixing method with NiFe 2 O 4 as a precursor, and its CO 2 capture capacity and in-situ hydrogenation performance were conducted on ICCC-RWGS reaction under different conditions. 20CeO 2 -NiFe-CaO exhibited a CO yielding of 9.35 mmol/g at 650 °C. During the carbon capture stage, CO 2 was adsorbed by CaO, leading to the formation of CaCO 3 . In the hydrogenation conversion stage, hydroxyl groups were generated on the surface, combining with CaCO 3 to produce formate species, further generating H 2 O and CO. 15CNF-CaO exhibited superior cyclic ICCC-RWGS reaction performance compared to 15NF-CaO, with a CO yield of 1.88 mmol/g after 40 cycles. CeO 2 inhibited the sintering of catalytic components, preserving a higher specific surface area and smaller particle size. Furthermore, CeO 2 in 15CNF-CaO inhibited carbon deposition and enhanced in-situ hydrogenation performance, exhibiting better CaO regeneration capability and better cyclic stability. These results could provide insight for designing the DFMs for the ICCC-RWGS process.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xin Zong,Yingmin Jin,Xuebai Zhang,Jinqiu Zhang,Xue Li,Yueping Xiong
Electrochemical CO 2 reduction (ECR) is regarded as a potential approach to generate renewable fuel and realize carbon cycling. Zn-based materials have been considered as effective catalysts to reduce CO 2 into CO. Unfortunately, low selectivity for CO and Zn metallization impede the development of Zn-based materials. Herein, we propose a strategy in utilizing the changeable valence state of Ce ions to stabilize oxidation state of ZnO, in which the Zn-O-Ce model is constructed by CeO 2 -modified ZnO nanofibers through electrospinning technique. The effective stabilization of ZnO oxidation state during electroreduction has been verified via operando Raman spectra and other characterizations. Besides, we also find that the introduction of trace amount of inactive CeO 2 can not only suppress the hydrogen evolution reaction (HER), but also greatly enlarge active sites. The catalyst with optimized molar ratio of CeO 2 to ZnO exhibits high Faradaic efficiency (FE) of 90.00 % for CO at −0.69 V vs reversible hydrogen electrode (RHE) in a flow cell. This work suggests stabilization of oxidation state via introduction of secondary metal-oxide by strong interactions between atoms can be improved.
研究领域:
材料科学
·
电化学
✓ 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）