FUEL
·
2020
·
IF 5.578
Riyang Shu,Rongxuan Li,Biqin Lin,Bowen Luo,Zhipeng Tian
Metal particle size and metal dispersion significantly influence the catalyst activity, and an efficient catalytic upgrade of bio-oil to high-quality liquid fuel is always difficult. Herein, a high dispersed Ru/SiO 2 -ZrO 2 catalyst was prepared by polyol reduction method, which exhibited a high catalytic activity on hydrodeoxygenation (HDO) of the phenolic compounds and pyrolysis lignin-oil. As a model compound, guaiacol had a conversion of 99.9% and a cyclohexane selectivity of 96.7% at the temperature of 240 °C. This polyol Ru/SiO 2 -ZrO 2 catalyst had a good recyclability in the guaiacol HDO. No significant decrease on the catalytic activity was presented after continuous 5 runs, and the conversion kept close to 100% and the selectivity of cyclohexane kept above 88%. Several common phenolic compounds also enabled to be turned into corresponding cycloalkanes efficiently. The high Ru dispersion and the large amount of strong acid sites in the polyol Ru/SiO 2 -ZrO 2 are the main reasons for the good catalytic performances. The synergetic effects between high dispersed metal site and strong acid site lead to a promoted efficiency in the HDO process to form the cycloalkanes. This active catalyst was also applicable to the upgrade of pyrolysis lignin-oil. After reaction, the content of hydrocarbons in the lignin-oil increased from 16.2% to 86.1%, and guaiacols and other oxygenated compounds were almost disappeared. The upgraded lignin-oil has potential to be used as high-quality fuels directly.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Jia Ding,Yunlei Zhou,Qian Wang,Shiyun Ai
As an important epigenetic modification , 5-hydroxymethylcytosine (5hmC) aroused wide concern about the distribution and the function. Due to the necessity of 5hmC detection, a novel photoelectrochemical (PEC) biosensor was established based on the in-situ generated heterojunction of Bi 4 NbO 8 [email protected] 2 S 3 , which was employed as the substrate material with excellent photoelectric property . The specific recognition of 5hmC relied on the covalent reaction between –CH 2 OH of 5hmC and –SH on the substrate electrode under the catalysis of M.HhaI methyltransferase . Afterwards, ZrO 2 was used as signal amplification unit capturing by the specific reaction of Zr with the phosphate group of 5hmC. The experimental results demonstrated well specificity and sensitivity of this biosensor. Under optimal conditions, the linear relationship between the photocurrent and the logarithm value of 5hmC concentration was constructed with the range from 0.3 to 300 nM and the detection limit of 0.0779 nM (S/N = 3). The procedures of constructing this biosensor were compact and convenient, and this biosensor realized actual detection of 5hmC level in wheat sample. Significantly, this biosensor was applied to a preliminary study that the heavy metal Pb 2+ and the perfluorooctanoic acid influence the expression of 5hmC in the genomic DNA of wheat seedling roots and leaves.
研究领域:
生物化学
·
分析化学
·
环境科学
·
植物生物学
·
表观遗传学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2019
·
IF 3.073
Wenkan Fang,Zhe Wang,Qiang Xie,Yan Liu,Deyi Wu
In developing a magnetic material for the recovery of phosphate from water/wastewater, both high magnetization and high uptake ability for phosphate are highly desirable. In our quest to obtain such a magnetic material, hydrous zirconia-coated magnetite nanocomposite (Fe 3 O 4 @ZrO 2 ) has been synthesized at different end-point pH values and stirring rates. The results indicated that the saturation magnetization of Fe 3 O 4 @ZrO 2 increased almost linearly with increasing end-point pH, and high stirring rate caused low magnetization. The magnetization behavior was closely related to the formation of the mineral magnetite, which was hindered at either low end-point pH or fast stirring rate. In contrast to magnetization, phosphate adsorption capacity decreased with increasing end-point pH, whereas the stirring rate had little effect. It is concluded that adopting a relatively low end-point pH and a low stirring rate is a good strategy for obtaining a Fe 3 O 4 @ZrO 2 material with good magnetic separability and a high affinity for P.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Zihao Zhang,Changxue Wang,Xin Gou,Hao Chen,Kequan Chen,Xiuyang Lu,Pingkai Ouyang,Jie Fu
A series of Cu-based catalysts with different supports were synthesized and studied for the in situ hydrogenation of 5-hydroxymethylfurfural (5-HMF) to dimethylfuran (DMF) using methanol as an economical hydrogen donor. The structures and properties of the four catalysts (Cu/Al 2 O 3 , Cu/ZnO, Cu/ZrO 2 , and Cu/CeO 2 ) were characterized using X-ray diffraction (XRD), temperature-programmed reduction (H 2 -TPR), and temperature-programmed desorption of ammonia (NH 3 -TPD). The experimental results showed that the use of different supports for the Cu-based catalysts significantly influenced their activity for both H 2 production from methanol and hydrogenation of 5-HMF. The catalyst Cu/Al 2 O 3 showed the best catalytic activity, which can be attributed to the highest activity for the in situ H 2 production from methanol, smallest Cu crystallite size, and strongest acidity. The effects of the substrate concentration, catalyst loading, and reaction temperature and time on the in situ hydrogenation of 5-HMF were systematically investigated to determine the optimum reaction conditions.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Zhihui Zhang,Jianxin Deng,Lingxuan Fan,Junyan Wang
The paper presents the fabrication of chessboard-structured (CF x ) n /CaF 2 /C–ZrO 2 /TiO 2 lubricant-hard alternate coatings by electrospray mask in-situ forming technique. The influence of the coating's structure and components on microstructure, film-substrate adhesion strength, and reciprocating wear performance were studied. The results showed that the chessboard structure of the hard coating had a high surface energy of 83.45 mJ/m 2 , which enhanced the adhesion of the lubricant coating. The addition of graphite (C) improved the uniformity, thermal stability, and lubrication of the (CF x ) n /CaF 2 lubricant coating. Within the 25–600 °C temperature range, the chessboard-textured (CF x ) n /CaF 2 /C–ZrO 2 /TiO 2 lubricant-hard alternate coating all exhibited low friction coefficients, which attributed to the synergistic effect between chessboard structure and coating material.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Mengliang Gao,Jie Gao,Ge Pu,Cong Yuan,Xingqiang Lu
The redox activity and thermal stability of oxygen carriers (OCs) during multi-cycle processes are important performance criteria. In this paper, the effects of three supports, i.e., ZrO2, TiO2, and YSZ (yttria-stabilized zirconia), on the reactivity, redox stability, hydrogen recovery capacity, and purity, as well as the sintering behavior of La-modified CoFe2O4 (LCF) OCs, were investigated. The results indicated that the unsupported LCF had severe sintering behavior, the aggregation of grains, the collapse of pore structure, and surface densification after multiple cycles led to a significant reduction in its activity. Meanwhile, the interaction between different supports and active components had a remarkable influence on fuel conversion and hydrogen recovery capacity. The formation of Fe2TiO5 in LCF6T4 weakened the initial reduction activity of the OC. Also, phase separation occurred after multiple cycles, forming separated Fe2O3 and TiO2, which further accelerated the sintering and resulted in irreversible deactivation. In contrast, LCF6Z4 and LCF6YZ4 exhibited excellent initial activity and cyclic stability, which was attributed to their improved pore structure and surface properties. Interestingly, the generated La2Zr2O7 pyrochlore structure was also conducive to the enhancement of cyclic stability properties for OCs. In addition, all OCs displayed high-purity hydrogen (>99.5%) generation properties. Overall, the ion-conductive YSZ-supported OC showed excellent reactivity and stability. After 11 cycles, the fuel conversion deactivation and hydrogen production deactivation for LCF5YZ5 were merely 6.23 and 8.26%, respectively.
研究领域:
化学工程
·
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 97
·期 3
·990-995
·
IF 2.107
Kuo Jiang,Songbai Liu,Yuan Li,Yaofei Li
Powders of zirconia doped with 8 mol% REO 1.5 (RE = Yb, Y, Gd, and Nd) were synthesized by using the sol–spray pyrolysis method. The effects of RE 3+ ionic radius on monoclinic (m) phase content of powders were investigated. The XRD results showed that the metastable tetragonal (t′) phase underwent a complete phase change to form m and cubic (c) phases after a heat treatment of 50–100 h at 1450°C. A cation size-dependent reduction in the m phase content of the REO 1.5 partially stabilized ZrO 2 powders was observed. The SEM–EDS analysis of the powders revealed that the RE 3+ concentrations in the c phases decreased with decreasing the RE 3+ ionic radius. These results indicate that the stabilizer concentration of the c phase can be attributed to RE 3+ ionic radii, resulting in different m phase contents. Compared to the REO 1.5 single doped ZrO 2 , the m phase contents of 8 mol% (RE 0.5 Yb 0.5 )–ZrO 2 (RE = Y, Gd, and Nd) powders were significantly reduced. The results prove that the stabilizer with a lower RE 3+ size is effective in reducing the m phase content of partially stabilized ZrO 2 after annealing at high temperatures.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2023
·
IF 9.4
Tangyou Sun,Fantao Yu,Xiaosheng Tang,Haiou Li,Fabi Zhang,Zhimou Xu,Qing Liao,Zhiqiang Yu,Xingpeng Liu,Peihua Wangyang,Hezhang Li,Ying Peng
The field of artificial intelligence and neural computing has been rapidly expanding due to the implementation of resistive random-access memory (RRAM) based artificial synaptic. However, the low flexibility of conventional RRAM materials hinders their ability to mimic synaptic behavior accurately. To overcome such limitation, organic-2D composites with high mechanical properties are proposed as the active layer of RRAM. Moreover, we enhance the reliability of the device by ZrO 2 insertion layer, resulting in stable synaptic performance. The Ag/PVA:h-BN/ZrO 2 /ITO devices show stable bipolar resistive switching behavior with an ON/OFF ratio of over 5 × 10 2 , a ∼2 400 cycles endurance and a long retention time (>6 × 10 3 s), which are essential for the development of high-performance RRAMs. We also study the possible synaptic mechanism and dynamic plasticity of the memory device, observing the transition from short-term potentiation (STP) to long-term potentiation (LTP) under the effect of continuous voltage pulses. Moreover, the device exhibits both long-term depression (LTD) and paired-pulse facilitation (PPF) properties, which have significant implications for the design of organic-2D composite material RRAMs that aim to mimic biological synapses, representing promising avenues for the development of advanced neuromorphic computing systems.
研究领域:
人工智能
·
神经计算
·
材料科学
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 50
·期 3
·5796-5805
·
IF 5.2
Qiang Jing,Jinxin Xing,Shichuang Cui,Changkun Cai,Jinxiao Bao,Yong Lyu,Ding Xu
(LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics with high density (98.1 %), high strength (1533 MPa), high surface residual stress (1305 MPa) and fine grain (96 nm) were prepared by ultra-low temperature hot pressing sintering. The results indicate that high pressure significantly promotes densification in the contact area of (LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics particles and no effect on grain growth. Low temperature can effectively reduce the transition from tetragonal to cubic phase (T-C) and limit grain growth. In addition, 1305 MPa compressive stress on the surface of (LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics were the main reason for the improvement of bending strength . This process provides a design idea for obtaining fine-grained fully dense structural ceramics .
研究领域:
材料科学
·
陶瓷工程
·
先进结构材料
·
烧结技术
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2018
·
IF 11.384
Yanfu Ma,Guangyue Xu,Hao Wang,Yingxiong Wang,Ying Zhang,Yao Fu
In this study, rare earth (RE) metal doped ZrO2 was prepared by a surfactant-assisted coprecipitation/hydrothermal crystallization method and used to load Co as catalyst for the hydrogenation of aromatic carbonyl compounds in water. Furfural was hydrogenated to furfural alcohol in water with up to 95 mol % yield over Co/ZrLa0.2Ox at 40 °C, 2 MPa H2 in 10 h. The doping of rare earth metal oxide has three advantages: (I) it promotes the ZrO2 to reach a small-sized, stable, and high-activity tetragonal phase zirconia and thus lead to a high specific surface area for metal loading; (II) it interacts with Co to reach an ultrasmall average particle size of 1.1 nm; and (III) it modifies the ZrO2 surface to increase the amount of acidic sites for the adsorption of carbonyl feedstock. The adsorption experiment indicated a tight interaction between not only the carrier and C═O bond but also the Co clusters and C═O bond, which were of benefit for the hydrogenation of carbonyl groups. The surfactant addition during the carrier preparation improves the strong metal–support interactions (SMSI) to promote Co dispersion and stability. Various rare earth metals including La, Pr, Nd, and Ce could modify ZrO2 with a similar mechanism. The as-prepared Co catalyst could also catalyze the selective hydrogenation of various aromatic aldehydes and ketones (such as 5-hydroxymethyl furfural, benzaldehyde, and acetophenone) in water, and 100% yield to corresponding alcohols was achieved. The catalyst remained stable and showed little deactivation during the recycling tests. This study not only presented a high-efficient, low-cost, and stable catalyst for the selective hydrogenation of various aromatic aldehydes and ketones but also give rise to an understanding of rare earth metal oxide doped ZrO2 supported nano Co ternary catalysts.
研究领域:
催化
·
材料科学
·
化学工程
·
绿色化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jia Ding,Lanlan Gao,Lulu Cao,Yunlei Zhou,Hao Wang,Jingrui Duan,Huanshun Yin,Jianchao Sun,Shiyun Ai
DNA hydroxymethylation is an important epigenetic modification, which plays crucial roles in many biological processes, such as gene expression and cell differentiation. Herein, a novel photoelectrochemical immunosensor was built for detecting 5-hydroxymethylcytosine (5hmC), where the perovskite Bi 4 TaO 8 Cl sensitized by 3,4,9,10-perylenetetracarboxylicacid (PTCA) was implemented as photoactive material, anti-5hmC antibody was served as target recognition reagent, ZrO 2 was used for connecting more modifications, and ferrocene was adopted as signal amplification unit. The prepared nanomaterials of Bi 4 TaO 8 Cl, PTCA and ZrO 2 were well characterized. The possible mechanism for the improved PEC response of Bi 4 TaO 8 Cl sensitized by PTCA was investigated carefully, indicated that the matched energy band facilitated the migration of photogenerated electron. In addition, the possible mechanism for signal amplification caused by ferrocene was investigated, showing that ferrocene acted as electron donor to accelerate electron transfer. Under the optimal condition, the biosensor manifested wide detection range from 0.02 to 100 nM with the low detection limit of 5.2 pM (S/N = 3). Moreover, the applicability of the biosensor was demonstrated by investigating the effect of heavy metal Cd 2+ and perfluorooctanoic acid on 5hmC content in the leaves and roots of wheat seedlings, as well as the effect of ALV-J on 5hmC content in chicken serum.
研究领域:
生物化学
·
分析化学
·
材料科学
·
环境科学
·
分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）