APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Li Cao,Lei Chen,Xiaodong Wu,Rui Ran,Tengfei Xu,Ze Chen,Duan Weng
The CeO 2 /TiO 2 catalyst was prepared by a deposition-precipitation method, which exhibited high low-temperature activity under the fast SCR condition. By using transient reaction analysis (TRA), the steps in the fast SCR, including NO 2 adsorption and decomposition, reaction between nitrates and NO, ammonium nitrate formation and reduction by NO, were investigated. Diffuses reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments, via NO + O 2 or NO + NO 2 adsorption, ammonium species reaction with NO x and NO reaction with NH 4 NO 3 , were designed to identify the roles of NO, NO 2 and NH 3 in fast SCR. Based on L-H mechanism, the NH 4 NO 3 formation played an important role in low-temperature SCR reaction. Compared with the behavior in standard SCR, the higher activity in the presence of NO 2 was ascribed to the faster NH 4 NO 3 formation rate and larger amounts of nitrates/nitrites. This phenomenon provided a basis for developing Ce-based catalysts as SCR catalysts for diesel exhaust aftertreatment.
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
Chemistry-An Asian Journal
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2022
·Vol. 18
·期 1
·e202200947
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IF 4.839
Zheng Zeng,Ma Juan Guan,Hongyu Chen,Xiang Xu,Ma Jianwu Zou,Ma Chongjie Zhang,Yankun Du,Liqing Li
Graphical As shown in the following figure, for PtFe 3 −C, toluene was directly adsorbed on the surface oxygen position and finally converted into H 2 O and CO 2 . For PtFe 3 −CeO 2 , two reaction channels containing both lattice oxygen (blue ball) from CeO 2 and surface oxygen (pink ball) and result in a better toluene catalytic performance than PtFe 3 −C. Elimination of VOCs by catalytic oxidation is an important technology. Here, a general synergistic capture-bonding superassembly strategy was proposed to obtain the nanoscale dispersed 5.8% PtFe 3 −CeO 2 catalyst, which showed a high toluene oxidation activity (T 100 =226 °C), excellent catalytic stability (125 h, >99.5%) and a good water resistance ability (70 h, >99.5%). Through the detailed XPS analysis, oxygen cycle experiment, hydrogen reduction experiment, and in-situ DRIFT experiment, we could deduce that PtFe 3 −CeO 2 had two reaction pathways. The surface adsorbed oxygen resulting from PtFe 3 nanoparticles played a dominant role, due to the fast cycling between the surface adsorbed oxygen and oxygen vacancy. In contrast, the lattice oxygen resulting from CeO 2 nanorods played an important role due to the relationship between the toluene oxidation activity and the metal-oxygen bonding energy. Furthermore, DFT simulation verified Pt sites were the dominant reaction active sites during this reaction.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Jing Zhang,Ye Li,Feng Wang,He Mei,Huimin Wu
In this paper, PDA n /CeO 2 /In 2 S 3 -X (X = m(CeO 2 )/m(CeO 2 +In 2 S 3 ), n = m(PDA)/ m(catalyst)) heterojunction was successfully fabricated by three steps to detect glucose and hexavalent chromium (Cr(VI)). CeO 2 was initially synthesized by calcination , followed by a hydrothermal method to make In 2 S 3 compounded with CeO 2 . Specifically, by optimizing the ratio of CeO 2 and In 2 S 3 , CeO 2 /In 2 S 3 -15 % showed the best photoelectric responses and sensing performances. In order to further improve the performance, polydopamine (PDA) was modified on the surface of CeO 2 /In 2 S 3 -15 % (PDA n /CeO 2 /In 2 S 3 -15 %). Besides, the results from optical characterizations and performance testings showed that PDA 0.1 /CeO 2 /In 2 S 3 -15 % exhibits the best absorption capacity and photocurrent responses. Interestingly, PDA 0.1 /CeO 2 /In 2 S 3 -15 % was applied to detect Cr(VI) and glucose in an effective fashion. The PEC glucose sensor based on PDA 0.1 /CeO 2 /In 2 S 3 -15 % showed an acceptable detection range between 0.5 μM and 27 mM with good sensitivity (575.20 µA·mM −1 ·cm −2 ) and low detection limit (0.076 μM). Meanwhile, for Cr(VI) sensing, it has a wide linear range of 0.5–240 µM with a high sensitivity of 1053.60 µA·mM −1 ·cm −2 , and the low detection limit is 0.098 µM. Furthermore, it could be also employed in real samples (human blood serum or sewage). Thus, the PEC sensor based on PDA/CeO 2 /In 2 S 3 has potential applications in glucose and Cr(VI) detection.
研究领域:
材料科学
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分析化学
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环境科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Die Deng,Shaohua Wen,Ya Wang,Jia Liu,Fang Li,Xiupei Yang
Cerium dioxide (CeO 2 ) has usually been used as a catalyst for colorimetric assays. However, the low catalytic efficiency has limited their further application. Covalent organic frameworks (COFs) have sparked increasing interest in the unique properties of large surface area, high porosity, and good thermochemical stability. Herein, a novel covalent organic framework composite (TpPa@CeO 2 ) with dual mimic enzyme activities (oxidase and peroxidase) was successfully synthesized via a facile hydrothermal method. TpPa@CeO 2 showed higher catalytic activity than CeO 2 . The excellent catalytic performance of TpPa@CeO 2 could be attributed to the higher surface area, more surface active species and higher Ce 3+ /Ce 4+ ratio in the composite than CeO 2 . Based on this, a visual and sensitive colorimetric sensor was constructed to detect ascorbic acid (AA) in the linear range of 0.2–35 μM with a low detection limit (LOD) of 0.061 μM. Moreover, the excellent colorimetric sensor was successfully applied to detect AA in beverage and tablet samples with satisfactory recoveries ranging from 95.78 % to 100.84 %. The catalytic mechanism could be that the composition of TpPa and CeO 2 improved the ratio of Ce 3+ /Ce 4+ , which promoted the decomposition of dissolved oxygen and H 2 O 2 by CeO 2 to produce superoxide radicals (·O 2 – ) and hydroxyl radicals (·OH), respectively. The facile and sensitive sensor system constructed by TpPa@CeO 2 with promising applications provides a new platform for the detection of AA in real sample analysis.
研究领域:
材料科学
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分析化学
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生物医学
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DOI
高影响因子
APPLIED ENERGY
·
2023
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IF 11.2
Xiangyu Yan,Buchu Lu,Hao Dong,Qibin Liu
Combining solar light and heat in dry reforming of methane (DRM) is a promising technology for reducing CO 2 to a valuable syngas and increasing the utilization of solar light in the solar-to-fuel process. The reaction temperature is still high and the mechanism remains unclear in DRM. Clarifying the synergistic mechanism of solar light and heat is pivotal for industrial applications. To this end, a nanoscale Ni/CeO 2 catalyst is prepared, and the synergistic effect of solar light and heat in DRM is experimentally investigated. The experimental results show that photo-thermochemistry leads to a 39.74% increase in relative conversion rate of CH 4 compared to thermochemistry, while the reaction temperature is reduced by 45 °C. The syngas production rate and the selectivity of DRM are improved by solar light. The in-situ infrared study indicates that solar light enhances the dissociation process of CH 4 and the production of HCOO ⁎ on the surface of the Ni/CeO 2 catalyst. The light response in the catalyst and microscopic enhancement of intermediate products are responsible for the increased DRM performance under photo-thermochemical conditions. These findings contribute to the understanding of the synergistic effects of solar light and heat, and guide the conversion of CO 2 into fuel with the aid of solar energy.
研究领域:
化学工程
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可再生能源
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催化科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Dong Liu,Feiyang Hu,Yue Yan,Runping Ye,Xiaohan Chen,Bingying Han,Zhang-Hui Lu,Li Zhou,Gang Feng,Rongbin Zhang
CO oxidation is the primary approach for eliminating CO from incomplete combustion, and the catalytic performance is dependent on the structure of catalysts. Herein, to explore the structure promotion in the CO oxidation reaction, polymethyl methacrylate was synthesized as the hard template to fabricate the three-dimensional ordered microporous (3DOM) Au/CeO 2 and compared the catalytic performance with the Au/CeO 2 rod catalyst. The 3DOM Au/CeO 2 catalyst could realize complete CO oxidation at 90 °C while 110 °C for Au/CeO 2 rod catalyst. The 3DOM Au/CeO 2 catalyst also showed outstanding stability for 60 h reaction. The achieved high performance could be attributed to the pore structures and the better metal-support interaction that facilitates abundant oxygen vacancies . Additionally, the Au distribution and oxygen vacancies promoted by the macropores structures were discovered using a series of characterizations. This work highlights the promotion of oxygen vacancies and metal-support interaction by 3DOM structure in CO oxidation reaction.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Dongdong Xu,Zhigao Xue,Lei Han,Kai Tao
Bimetallic sulfides with superior electrochemical activity are extensively explored as electrode materials for electrochemical energy related applications. However, their utilizations are impeded due to unfavorable faradaic reaction kinetics and poor electrochemical stability. To overcome these defects, this study reports interface engineering of heterogeneous nanosheet arrays on Ni foam (NF) through surface modification of metal-organic framework (MOF)-derived zinc cobalt sulfide (Zn/Co-S) with CeO 2 nanoparticles (NPs). MOF-derived porous Zn/Co-S nanosheets have highly exposed electrochemical active sites and abundant channels for charge transport. The strong interfacial coupling between Zn/Co-S and defective CeO 2 leads to fast charge transfer, thereby improving electrochemical activity. The CeO 2 can also prevent Zn/Co-S from degrading in KOH solution. Moreover, the self-supported electrode shows high electronic conductivity and strong adhesion with the conductive substrate. Therefore, the specific capacity and electrochemical stability of resulting Zn/Co-S@CeO 2 /NF are significantly higher compared with Zn/Co-S/NF. Furthermore, an asymmetric supercapacitor (ASC) based on Zn/Co-S@CeO 2 /NF and activated carbon (AC) exhibits high energy storage capability (42.4 Wh kg −1 ) and outstanding operating durability (91.1 % after 8000 cycles). These results demonstrate that the as-prepared electrode is a superior candidate for electrochemical devices .
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Jingxia Yang,Bingjie Zou,Qing Fang,Jinjie Wang,Lidong Wang
To figure out the behavior of benzotriazole (BTA) loaded in CeO 2 nanocontainers during long term anticorrosion, three kinds of CeO 2 spheres were used: hollow spheres ( HS s), double-shell hollow spheres ( DHS s), and solid-mesoporous spheres ( SS s). The BTA loading and releasing situations were checked, and CeO 2 - HS s exhibited the largest BTA loading amount of 12.5 wt%, forming by both chemical and physical adsorption. The highest BTA loading in CeO 2 - HS s may be attributed to its hollow structure and more Ce 3+ sites (39 %) for BTA anchoring. Thus, CeO 2 - HS s@BTA exhibited an excellent long-term anticorrosion in epoxy coating for low carbon steel protection, showing no rusting after 40 days of salt spray experiment.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
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IF 12.264
Pan Zhengbin,Han Ershuan,Zheng Jingui,Lu Jing,Wang Xiaolin,Yin Yanbin,Waterhouse Geoffrey I. N.,Wang Xiuguo,Li Peiqiang
Flower-like CeO 2 nanoparticles enhance the performance of CuO nanoparticle/Cu.
The system benefits from the heterojunction between p-type CuO and n-type CeO 2 .
The selective reduction of CO 2 to methanol on the target catalyst is studied.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2017
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IF 6.844
Benxia Li,Baoshan Zhang,Shibin Nie,Liangzhi Shao,Luyang Hu
Exploiting photocatalysts with improved properties for solar-driven chemical reactions is of great significance in developing green chemistry. Here, a series of Au/CeO 2 hybrid nanofibers with different Au loadings have been fabricated by a simple method of electrospinning followed by calcination in air. The particle size and plasmonic absorption of Au nanoparticles (NPs) loaded in the nanofibers were analyzed and found to vary with the dosage of chloroauric acid in the precursor solution. The Au/CeO 2 hybrid nanofibers were used as photocatalysts for selective oxidation of benzyl alcohol to benzaldehyde with O 2 under simulated sunlight and visible light (>420 nm), respectively. The results showed that introducing Au NPs into CeO 2 nanofibers induced a great improvement in photocatalysis. The degree of improvement increased first and then decreased with the increase in Au loading, reaching an optimal level over 0.5 wt.% Au-loaded CeO 2 nanofibers. The photocatalytic reaction presents a very high selectivity of 100% for benzaldehyde, which is important for organic synthesis. The transient photocurrent responses of the Au/CeO 2 catalysts were also tested for corroborative evidence. After detailed discussion of various factors including plasmonic absorption, charge transfer, and surface activity of the photocatalyst, a possible mechanism for the photocatalytic oxidation of benzyl alcohol occurring at the Au–CeO 2 interface was proposed.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xiaoxue Yang,Kun Luo,Zhoujie Pi,Peng Shen,Puyu Zhou,Li He,Xiaoming Li,Qi Yang
A novel nanocomposite CeO 2 /Fe 3 O 4 /biochar (BC) was prepared using a straightforward, solvent-free mechanical ball milling method. Comparatively to the material prepared by chemical co-precipitation (77.14 %) and raw BC (33.64 %), CeO 2 /Fe 3 O 4 /BC prepared by ball milling achieved better tetracycline (TC) removal (94.35 %) under the optimal condition (TC concentration 10 mg·L -1 , catalyst dose 0.5 g·L -1 and pH 9.01). Ball milling not only reduced the particle size, but also increased the surface area of composite, which was favorable to the adsorption of TC on CeO 2 /Fe 3 O 4 /BC. Meanwhile, the number of oxygen-containing functional groups in as-prepared nanocomposite increased after ball milling, which could serve as the bridge of electron transfer to enhance TC degradation. Dissolved oxygen (DO) was activated by CeO 2 /Fe 3 O 4 /BC to produce reactive oxygen species (ROS) for the TC degradation. X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) characterization indicated that the enhanced oxygen activation should be attributed to the presence of Ce 4+ /Ce 3+ and Fe 3+ /Fe 2+ redox pairs and persistent free radicals (PFRs) in CeO 2 /Fe 3 O 4 /BC. Desorption experiments suggested that the adsorption and degradation induced by ball-milled CeO 2 /Fe 3 O 4 /BC were accounted for about 79.8 % and 20.2 % of total TC removal, respectively. This study revealed that the organic pollutants removal by BC-based nanocomposite is not alone contribution of the adsorption and the degradation behavior during this process should be concerned.
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
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
·
IF 8.7
Chen Yang,Jian Yang,Shuangshuang Liu,Mingxue Zhao,Xu Duan,Hongli Wu,Lang Liu,Weizao Liu,Jiangling Li,Shan Ren,Qingcai Liu
Owing to its feasibility, efficiency in light-harvesting and effectiveness in the interfacial charge transfer between two n-type semiconductors, constructing heterojunction photocatalysts have been identified as an effective way for enhancing the photocatalytic properties. In this research, a C–O bridged CeO 2 /g-C 3 N 4 (cCN) Step-scheme (S-scheme) heterojunction photocatalyst was constructed successfully. Under visible light irradiation, the cCN heterojunction exhibited the photocatalytic degradation efficiency of methyl orange, which was about 4.5 and 1.5 times higher than that of pristine CeO 2 and CN, respectively. The DFT calculations, XPS and FTIR analyses demonstrated the formation of C–O linkages. And the calculations of work functions revealed the electrons would flow from g-C 3 N 4 to CeO 2 due to the difference in Fermi levels , resulting in the production of internal electric fields . Benefiting from the C–O bond and internal electric field, the photo-induced holes in the valence band of g-C 3 N 4 and the photo-induced electrons from conduction band of CeO 2 would be recombined when exposed to visible light irradiation, while leaving the electrons with higher redox potential in the conduction band of g-C 3 N 4 . This collaboration accelerated the separation and transfer rate of photo-generated electron-hole pairs, which promoted the generation of superoxide radical (•O 2 − ) and improved the photocatalytic activity .
研究领域:
材料科学
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环境科学
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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）