ENERGY & FUELS
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2022
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IF 4.654
Shumei Chen,Chao Miao,Lixing Liang,Jing Ouyang
This paper reports the synthesis and CO2 methanation performance of Ni/CeO2–ZrO2 (CZ) solid solutions assembled on different clay minerals (rectorite, attapulgite, halloysite, and kaolin). The catalytic performance of the samples was examined in temperature range 200−400 °C at normal pressures. The attapulgite (ATP) assembled Ni nps-incorporated-CZ solid solution (Ni–CZA) has the highest CO2 conversion and excellent stability. The CO2 conversion of the Ni–CZA catalyst reached up to 81.2% at 400 °C, and CH4 selectivity was nearly 100%. The catalyst assembled on ATP has excellent adsorption performance and a large specific surface area, resulting in higher Ce3+ and adsorbed oxygen content, thanks to the high content of oxygen vacancies and faster oxygen transfer speed. Mechanistic analysis shows that the H2 dissociates at the Ni site, the CO2 was decomposed into CO and O, and the ATP and CZ provide hydroxyls and oxygen vacancies, respectively, in this composite catalyst.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
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
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材料科学
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Yajing Wang,Yane Zheng,Yuhao Wang,Kongzhai Li,Yaming Wang,Lihong Jiang,Xing Zhu,Yonggang Wei,Hua Wang
Chemical-looping reforming of methane (CLRM) offers an effective approach for the production of syngas . A series of Ce x Zr y Cu 1−x−y (x = 0.6, 0.7, y = 0–0.35) mixed oxides were successfully prepared by sol-gel method, and characterized by means of XRD , H 2 -TPR, BET, XPS , Raman and CH 4 -TPR. The addition of Cu and Zr ions caused the distortion of CeO 2 lattice and induced more oxygen vacancies , which promoted the mobility of lattice oxygen in the materials. Ce x Zr y Cu 1−x−y mixed oxides also owned smaller grain size and better thermal stability than pure CeO 2 -CuO mixed oxides. Among the series of Ce x Zr y Cu 1−x−y mixed oxides, the reducibility of Ce 0.6 Zr x Cu 0.4−x and Ce 0.7 Zr x Cu 0.3−x samples gradually increased with the Cu content. It was found that the Ce 0.7 Zr 0.2 Cu 0.1 sample owned the most abundant oxygen vacancies on the surface. The Ce x Zr y Cu 1−x−y mixed oxides with lower Cu content (≤0.1) produced higher amount of H 2 and CO while smaller CO 2 . Ce 0.7 Zr 0.2 Cu 0.1 sample still retained better structural stability and thermal stability after 20 times cycled reaction.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2016
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IF 4.917
Jing Yang,Liang Zhao,Chunze Liu,Yuanyuan Wang,Liyi Dai
Efficient catalytic ethanolysis and gasification of kraft lignin were conducted over a versatile supported catalyst Rh/La 2 O 3 /CeO 2 –ZrO 2 to give high-value aromatic alcohols and H 2 -rich gas. The removal of phenolic hydroxyl group was the most prevalent reaction, and importantly, almost no phenols, undesired char and saturating the aromatic ring were detected. Meanwhile, the feedstock and solvent both played key roles in H 2 generation that contributed to the hydrodeoxygenation of liquid components and made the whole catalytic process out of H 2 supply. Reusability tests of catalyst indicated that the crystalline phase transition and agglomeration of support, the loss of noble metal Rh and carbon deposition were the possible reasons for its deactivation in supercritical ethanol. Comparing with water, methanol and isopropanol system, ethanol was the only effective solvent for the depolymerization process.
研究领域:
化学工程
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能源科学
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 16
·2107401
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IF 15.153
Qiang Luo,Yunhong Li,Xiaobing Huo,Jinyang Li,Linqian Li,Wei Wang,Yilan Li,Shipeng Chen,Yinqiao Song,Ning Wang
The generation of undesired biofouling in medical and engineering applications results in a reduction in function and durability. Copying functionalities of natural enzymes to combat biofouling by artificial nanomaterials is highly attractive but still challenged by the inferior catalytic activity and specificity principally because of low densities of active sites. Here, an innovate strategy is demonstrated to stabilize high-density ultrasmall ceria clusters on zirconia for biofouling prevention. Benefiting from the unique structure, CeO 2 @ZrO 2 nanozyme can significantly enhance the haloperoxidase-mimicking activity in catalyzing the oxidation of bromide with H 2 O 2 into biocidal hypobromous acid as a result of abundant defects and surface strong acidity sites, inducing impressive antibacterial and antibiofouling capacity compared with that of pristine CeO 2 . This work is expected to open a new avenue for the rational design of cluster catalysts for various targeting catalytic applications.
研究领域:
材料科学
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纳米技术
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生物医学工程
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2011
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IF 3.65
Qingxiang Wang,Feng Gao,Xuan Zhang,Bin Zhang,Shunxing Li,Zhengshui Hu,Fei Gao
A composite film that contained CeO 2 –ZrO 2 hollow nanospheres and chitosan was deposited on a gold electrode using a one-step electrodeposition based on the pH-dependent solubility of chitosan. Electrochemical characterization experiments showed that the electroactive surface of the modified electrode was significantly enhanced by the introduction of the CeO 2 –ZrO 2 nanospheres into the chitosan gel during electrodeposition . Furthermore, an electrochemical DNA biosensor was fabricated based on the synergistic affinity of CeO 2 –ZrO 2 and chitosan in the nanocomposite film to probe DNA . DNA hybridization assays suggested that the target DNA could be quantified over a wide dynamic range of 1.63 × 10 −13 M–1.63 × 10 −8 M with a detection limit of 1.0 × 10 −13 M using methylene blue as an electrochemical indicator. This work describes a simple strategy for the preparation of a stable and conductive interface for electrochemical detection of DNA hybridization and opens a path for the application of CeO 2 –ZrO 2 nanospheres and chitosan in DNA electrochemical biosensing analysis.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Moa Z. Granlund,Kjell Jansson,Marita Nilsson,Jazaer Dawody,Lars J. Pettersson
The objective of this paper was to study the influence three promoters (Co, La, Mn) had on the catalytic activity of Rh-based catalysts for autothermal reforming of diesel. The catalysts were supported on CeO 2 -ZrO 2 and the loading was 1 wt.% Rh and 6 wt.% promoter. The catalytic activity was evaluated in a monolith bench scale reactor with Swedish Environmental diesel, MK1. The process parameters employed at the ATR experiments were; O 2 /C ∼ 0.45, H 2 O/C ∼ 2.5 and GHSV ∼ 50,000 h −1 , meanwhile the reactor temperature was ramped from 700 °C to 950 °C. The catalysts were compared based on their fuel conversion, H 2 yield and the selectivity of different short-chain hydrocarbons. The results showed that all three catalysts had both high fuel conversion and H 2 yield in the optimal ATR operation temperatures. The H 2 yield and fuel conversion were increasing in the order Rh/Mn, Rh/La, Rh/Co. To get further insight in the difference between the materials the fresh and aged catalytic materials were characterized. The characterization methods used were H 2 -temperature programmed reduction (H 2 -TPR), powder X-ray diffraction (XRD), and BET surface measurements. The BET surface measurements showed that promotion with La gave improved thermal stability of the material. The XRD showed a high dispersion of all metals except Co, which was present as crystals in the size range of the particles of the support.
研究领域:
催化
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）