PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Yihang Dong,Zhaoyang Liu,Lipeng Pang,Ye Han,Shuyu Yao,Xiangnan Wang
{(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is synthesized by co-precipitation method. Thermal analysis, phase structure, lattice constant , micro-morphology, elements distribution, density, open porosity and electrical conductivity are measured by TG, DSC , XRD , GSAS, SEM , EDS, Archimedes method and EIS respectively, and the influence of CeO 2 content on the above properties are investigated. TG-DSC results show that the weight loss of the sample is mainly due to the decomposition of the initial powder, forming a solid solution above ~600 °C. XRD results show that {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6) is a cubic solid solution, and the lattice parameters and volume increase with the increase of CeO 2 content. SEM results show that YZC is a dense sintered body. Density and open porosity of YZC sample are ~4.5 g cm −3 and ~0.12, respectively. The electrical conductivity results show that the conductivity of {(Y 2 O 3 ) 0·08 (ZrO 2 ) 0.92 } 1- x (CeO 2 ) x (0 ≤ x ≤ 0.2) is equivalent, and then the conductivity decreases due to defect association with the increase of CeO 2 content.
研究领域:
材料科学
·
陶瓷材料
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 10
·1859-1865
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IF 3.756
Shouzhen Li,Fan Wu,Xuan Zhang,Guangting Han,Yang Si,Jianyong Yu,Bin Ding
Developing ceramic materials for thermal insulation is vital for various applications. However, ceramics have been considered intrinsically rigid and brittle due to the limited crystallographic slips and structural collapse during service. Their lack of flexibility has hampered many high-end applications of ceramic materials. We developed flexible Al2O3/ZrO2 nanofibrous membranes via sol–gel electrospinning and calcination. Al2O3/ZrO2 nanofibrous membranes had flexibility from −196 °C to 1300 °C and low thermal conductivity (∼0.03166 W m−1 K−1 at room temperature). They also supported 1350-times their weight without suffering structual damage. Hence, Al2O3/ZrO2 nanofibrous membranes could be used for thermal insulation in aerospace and industrial fields, and even in harsh environments.
研究领域:
材料科学
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热工程
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纳米技术
✓ 已验证
DOI
高影响因子
NANO
·
2019
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IF 1.293
Na Wang,Jianyao Kou,Lijie Wang,Fei Wang,Kui Lu
A novel electrochemically activated ZrO 2 nanoparticles modified carbon paste electrode (CPE) (ZrO 2 -CPE(ox)) was prepared and applied for selective and sensitive determination of hyperin. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and electrochemical experiment were used to characterize the ZrO 2 nanoparticles and investigate the electrochemical performance of the ZrO 2 -CPE(ox). Compared with bare CPE and electrochemically activated CPE (CPE(ox)), the ZrO 2 -CPE(ox) got more reactive sites by electrochemical treatment and exhibited larger effective surface area and more excellent electrochemical catalytic activity toward the redox of hyperin. Under the optimum conditions, the oxidation peak currents showed a linear relationship with the concentrations of hyperin in the range of 5 . 0 × 1 0 − 9 – 2 . 0 × 1 0 − 6 mol L − 1 and 2 . 0 × 1 0 − 6 – 1 . 2 × 1 0 − 5 mol L − 1 , and a low detection limit of 1 . 0 × 1 0 − 9 mol L − 1 was achieved for hyperin. Moreover, the proposed method exhibited an excellent selectivity, stability, reproducibility and repeatability, which make it very suitable for a potential choice for determining the concentrations of hyperin in drug matrices.
研究领域:
分析化学
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药物分析
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
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2022
·
IF 4.537
Jianjun Zhang,Ziqiao Wang,Jiajun Luo,Subin Wang,Bingliang Liang,Weihua Chen
MoSi 2 is the most potential high temperature structural materials that can be used in aerospace and aviation industry. But its fracture toughness is low and its low temperature oxidation resistance is poor, which limits its application. To solve these problems, novel MoSi 2 @ZrO 2 core-shell composites were prepared by spark plasma sintering (SPS) at 1300 °C⁓1500 °C. The influences of sintering temperatures on the microstructures, mechanical properties and tribological properties of the composites were studied. It was found that the relative density, Vickers hardness , bending strength and fracture toughness of the composites first ascended and then descended with the sintering temperature rising from 1300 °C to 1500 °C. As the sintering temperature reached 1400 °C, the maximum relative density, the maximum Vickers hardness , the maximum bending strength and the maximum fracture toughness of the composite material achieved 97.5%, 1103 HV, 540 MPa and 7.96 MPa·m 1/2 , respectively. Additionally, the friction coefficient of the composite materials first descended and then ascended with sintering temperature rising. As the sintering temperature reached 1400 °C, the minimum friction coefficient was about 0.355. Moreover, we analyzed the relations between the mechanical properties and microstructure. The toughening mechanisms of the MoSi 2 @ZrO 2 composites were also discussed. In addition, during cyclic isothermal oxidation at below 600 °C, weight gains of the MoSi 2 @ZrO 2 composites evidently decreased, compared with that of pure MoSi 2 , proving better low-temperature oxidation resistance .
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2016
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IF 9.307
Shanhui Zhu,Yanfeng Xue,Jing Guo,Youliang Cen,Jianguo Wang,Weibin Fan
The high-yield synthesis of the biofuel γ-valerolactone (GVL) is a challenging task, which currently stems from the depolymerization of cellulose to levulinic acid, followed by its hydrogenation. We have developed a novel integrated process for the production of GVL from hemicellulose without using liquid acids and external hydrogen. The hemicellulose feed underwent hydrolysis and consecutive dehydration to produce furfural over ZSM-5 catalyst. Subsequently, the formed furfural with 2-propanol performed tandem conversion to GVL over Au/ZrO2 catalyst combined with ZSM-5. This process gave a high yield of GVL under mild conditions: up to 61.5% based on hemicellulose. The outstanding performance was mainly ascribed to the strong interface interaction of Au with ZrO2 species, large amounts of medium-strength acid sites over ZSM-5, and efficient synergy between active metal and acid sites.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Xinyue Wang,Huan Cheng,Yuanzhi Min,Xian Li,Lijun You,Jumei Li
In this study, a crystalline mesoporous ZrO 2 interlayer allowing for enrichment capability and photocatalytic activity was introduced to develop a novel magnetic Fe 3 O 4 /m-ZrO 2 /Ag nanocomposite combined with excellent SERS activity and photocatalytic property. The coverage of Ag nanoparticles on Fe 3 O 4 /m-ZrO 2 /Ag was well controlled to tune their SERS sensitivity by varying the feed amount of AgNO 3 . Several characterization methods were utilized to investigate their composition, morphology and crystal structure. The SERS experiments demonstrated Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites possessed markedly SERS sensitivity, exceptional signal reproducibility and excellent storing stability. They could sense R6G and Cr (VI) at the concentrations of 10 −9 and 5 × 10 −8 M, respectively. Beyond that, the Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites effectively accomplished recyclable detecting R6G and Cr (VI) in 5 cycles through facile photocatalytic removal of pollutants under UV irradiation. Altogether, the novel Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites prepared in this study have high SERS sensitivity and good photocatalytic performance, which is of great significance for environmental detection and ecological restoration.
研究领域:
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
Catalysis Science & Technology
·
2024
·
IF 4.4
Peng Wang,Shaowen Hou,Pengxiang Tu,Bing Xue,Weixin Guan,Dong Wang,Danfeng Zhou,Yajun He,Xinhui Chen,Yixing Wang,Kegong Fang,Xiaonian Li,Jun Ni
As a sustainable, environmentally friendly, and economically viable way to produce 1,3-butadiene, the ethanol-to-butadiene (ETB) process has received increasing attention recently. This ETB process normally requires catalysts with suitable acidity and basicity, namely an acid–base balance. However, the origin of acid–base balance has not yet been elucidated. Herein, we demonstrate that by finely coordinating the interaction of ZnO and ZrO2, a butadiene productivity of 0.33 gBD gcat−1 h−1 at low WHSV and 1.39 gBD gcat−1 h−1 at high WHSV can be achieved. In contrast, pure ZnO prefers ethanol dehydrogenation to acetaldehyde and pure ZrO2 favors ethanol dehydration to ethylene and diethyl ether. Through a variety of characterization techniques, we found that the interaction of ZnO and ZrO2 alters the acidity and basicity of catalysts, resulting in volcanic shapes of ethanol conversion, butadiene selectivity, and butadiene yield in the ETB process. These findings provide in-depth insights into the understanding of the ETB process and may also apply to other reaction systems using ZnO–ZrO2 as catalytically active components.
研究领域:
化学工程
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催化
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hong-Lan Liu,Lin-Lin Zhu,Xing-hao Tan,Xin Xu,Guang-Xiang Zhang,Yu-Jian Jian,Min-Min Dai,Jia-hao Chen,Hua-Tay Lin
Highly transparent Er 2 O 3 ceramics were fabricated at varied temperatures in the range of 1700–1850 °C for 8 h in vacuum environment using commercial Er 2 O 3 powders as starting materials and 1 at.% ZrO 2 as sintering additive, for the first time. The influence of sintering temperature on the microstructure and optical properties of Er 2 O 3 ceramics was investigated. The Er 2 O 3 ceramic sintered at 1850 °C had an average grain size of 6.2 μm and an in-line transmittance of 69% at 1100 nm, which reached the best transmittance level compared to the open literature. Therefore, the Er 2 O 3 ceramic doped with 1 at.% ZrO 2 as sintering additive developed in this study presented relatively smaller grain size and excellent optical quality, and could be a potential material for laser and photonic applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 13
·3184-3197
·
IF 5.686
Chao Huang,Can Zhu,Mingwei Zhang,Yongwu Lu,Qianhao Wang,Heming Qian,Jiangang Chen,Kegong Fang
Graphical Synergetic effect : The physically mixed CuCoAl|t-ZrO 2 multifunctional catalyst could achieve superior selectivity towards alcohols while simultaneously inhibiting the generation of hydrocarbons from CO hydrogenation. Selective synthesis of higher alcohols from syngas is promising but remains challenging owing to the low stability and selectivity towards higher alcohols. Here we introduce a CuCoAl|t-ZrO 2 (t denotes tetragonal crystal phase) multifunctional catalyst that can achieve an alcohol selectivity of 64.8 % with 79.6 % C 2+ OH, and a total selectivity of alcohols and olefins to 81.7 %. The proper proximity was tuned to increase selectivity towards alcohols and decrease the selectivity towards hydrocarbons. The lower surface [H*]/[C*] ratio due to the stronger basic sites of the CuCoAl|t-ZrO 2 limited alkyl (CH x ) species hydrogenation, and promoted CO insertion and carbon chain growth, resulting in improving the alcohols selectivity. Meanwhile, the weaker adsorption of bridge-type adsorbed CO and the lower decomposition rate of multi-bonded adsorbed CO over CuCoAl|t-ZrO 2 inhibited hydrocarbon generation. The selective promotion of the reaction route via the synergetic effect between CuCoAl and t-ZrO 2 was proposed to boost higher alcohols selectivity. This work may aid the rational design of effective multifunctional catalyst with synergistic effects for tuning selectivity.
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
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Peng Zhang,Fangfang Li,Xuefang Yao,Pengze Zhang,Yukai Wu,Mengmeng Xi,Fanhui Meng,Lihua Kang,Mingyuan Zhu
The GaZrO x solid solution has been recently employed in OX-ZEO bifunctional catalysts for efficient conversion of syngas to light olefins, but it remains challenging to identify the specific contributions of Zr and Ga and to understand the detailed reaction mechanisms due to the structural complexity. To address this complexity and elucidate the active sites over the Zr-Ga oxide system, this study presents a catalyst designed by physical mixing ZrO 2 with different crystalline phases ( m -ZrO 2 & t -ZrO 2 ) and α -Ga 2 O 3 . The physical mixture of m -ZrO 2 and α -Ga 2 O 3 achieves a high CO conversion of 39.1 %, with light olefins selectivity of 87.3% among hydrocarbons after combined with SAPO-34, surpassing the performance of physical mixture of t -ZrO 2 and/or α -Ga 2 O 3 with SAPO-34. Combining the various characterizations and DFT calculations, we have confirmed that m -ZrO 2 site, enriched with oxygen vacancies and surface hydroxyl groups, is essential for CO adsorption and HCOO* intermediate formation, while the α -Ga 2 O 3 site plays a key role in the dissociation of H 2 . Furthermore, the electron transfer from m -ZrO 2 to α -Ga 2 O 3 in their mixture is more efficient than in a physically mixed t -ZrO 2 and α -Ga 2 O 3 . This accelerates the H 2 dissociation and boosts the spillover of hydrogen from α -Ga 2 O 3 to m -ZrO 2 , leading to the formation of more CH 3 O* intermediates and higher light olefins yield when combined with SAPO-34.
研究领域:
催化化学
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材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Xin Zhang,Jingyun Jiang,Hao Li
Hydrodeoxygenation (HDO) of bio-oils obtained by rapid pyrolysis of biomass into high value-added chemicals generally required harsh conditions. Herein, three kinds of mixed-phase ZrO 2 supports (denoted as ZSX, X = 2–4) with different crystal structure proportions were prepared by one-pot hydrothermal synthesis method, and their performance on the properties of Pd/ZrO 2 catalysts were investigated for vanillin HDO. Pd/ZS3 exhibited excellent efficiency in HDO of vanillin, a typical model compound of lignin, achieving approximately 100% yield of 2-methoxy-4-methylphenol (MMP) in presence of n-butanol as solvent and polymethyl hydrogen siloxane (PMHS) as hydrogen donor under mild conditions (35 °C, 1 h). It was due to catalytic synergy of exposed metal active sites, oxygen vacancies (O v ) and acid sites to occur electron transfer and enhance interaction between Pd and ZrO 2 . By tuning the crystal structure of ZrO 2 support, the influence of O v and acid sites of Pd/ZrO 2 over vanillin HDO performance was investigated, Pd/ZS2 with abundant O v and Pd/ZS4 with substantial acid sites promoted hydrogenation and hydrogenolysis , respectively, Pd/ZS3 possessed preferable conversion and selectivity as having the properties of both at once. Additionally, reaction pathway was also proposed in which vanillin was converted to MMP by combining intermediate of 4-hydroxy-methyl-2-methoxyphenol (HMP) with active hydrogen species while removing water. This developed catalysts with different crystalline highlighted an enormous promise for HDO of bio-oils into green fuel under mild conditions.
研究领域:
催化
·
化学工程
·
绿色化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2025
·
IF 3.6
Hui Huang,Qi Xu,Liangyun Yu,Lidong Li,Ying Zhang,Fennv Han,Qi Zhang
Currently, there is a thermodynamic and kinetic mismatch between carbon dioxide methanation. Carbon dioxide is stable in nature and requires a highly active catalyst to facilitate its reduction reaction. In this article, Ru/ZrO 2 catalysts are prepared by a structure-directed derivatization strategy using zirconium-based metal-organic frameworks (MOFs) (UiO-66) as precursors. The porous framework structure of MOFs was utilized to construct Ru nanoparticles with a large size (≈9.7 nm). Photothermal catalysis is employed, and the photoexcitation induced the transfer of electrons from the conduction band of ZrO 2 to Ru, which elevated the electron density of Ru to the enriched state and promoted the activation of CO 2 adsorption, while the photothermal effect facilitated the warming of the catalyst bureau, which provided a favorable condition for CO 2 methanation. The compositional valence, morphology, specific surface area, bandgap and other properties of the catalysts were evaluated by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscpe, Brunner-Emmet-Teller measurements, hydrogen temperature-programmed reduction, CO 2 -TPD, ultraviolet–visible, photoluminescence, and photocurrent response characterization. The experimental results showed that 99% methane selectivity and 120.354 mmol g cat −1 h −1 methane yield were achieved at 1 MPa and photothermal (250 °C) conditions.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 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）