CHINESE CHEMICAL LETTERS
·
2017
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IF 1.932
Yan-Fu Ma,Hao Wang,Guang-Yue Xu,Xiao-Hao Liu,Ying Zhang,Yao Fu
A series of cobalt catalysts with different supports were prepared for the selective conversion of biomass-derived furfural to cyclopentanol (CPL) in one step. The best CPL yield was 82 mol% at 160 °C, 2 MPa H 2 , 4 h when cobalt was supported on ZrO 2 -La 2 O 3 . The supports were characterized by X-ray diffraction (XRD) and temperature-programmed desorption of ammonia (NH 3 -TPD). The XRD results indicated that the more stable t-ZrO 2 formed by doping La 2 O 3 . The amount of acid sites of the catalyst increased, too. The influences of parameters such as reaction temperature, hydrogen pressure, and reaction time on the catalytic activity were also investigated. The polymer formed during the reaction may cause the deactivation of the Co/ZrO 2 -La 2 O 3 catalyst. This work provides a possibility to prepare the stable t-ZrO 2 and apply with cobalt metal for biomass valorization.
研究领域:
化学工程
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xinxin Zhang,Xiaota Cheng,Yang Si,Jianyong Yu,Bin Ding
As promising candidates for a wide range of applications, advanced ceramic aerogels with robust mechanical properties are urgently needed. However, the generic structural characteristics of ceramic aerogels, such as brittleness, fatigue failure, and large energy dissipation, present a great obstacle to their practical applications. Herein, we report a universal strategy to demonstrate a ceramic nanofibrous aerogel with superior elasticity and high fatigue resistance, realized by assembling flexible ZrO 2 -SiO 2 nanofibers into fluffy lamellar arch-shaped cellular structured. The as-obtained ZrO 2 -SiO 2 nanofibrous aerogels can rapidly recover from 90% strain, and exhibit high compression strength of 950 kPa (90% strain) and temperature-invariant superelasticity (from −196 to 1100 °C). In particular, the aerogels exhibit a low energy loss coefficient (0.28) and high fatigue resistance with zero plastic deformation after 1000 compression and release cycles, surpassing the performance of previously reported ceramic aerogels. Furthermore, the low thermal conductivity (0.0268 W m −1 K −1 ) and excellent high-temperature thermal insulation make it a desirable candidate for heat insulators under harsh conditions. The successful synthesis of these structural ceramic materials with high superelasticity, excellent compressibility, and superior fatigue resistance simultaneously opens up avenues for further the development of mechanically robust aerogel materials.
研究领域:
材料科学
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热力学工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Xiaonong Wang,Liping Liu,Xiaoping Wang,Xiujun Bai,Jingu Qin,Xiaoxia Li,Bin Wang
Lightweight absorbers with effective broad absorption and high thermal stability are highly desirable in the field of electromagnetic wave absorption. In this work, we introduce a facile carbon thermal shock method to prepare ZrO 2 /C composites using UIO 66 (Zr) as the precursor. The instant heating and cooling process ensures the uniform deposition of nano-sized ZrO 2 ( ca . 5–15 nm) on graphene, exhibiting an ultrahigh interfacial number density of ca. 10 15 m −2 that favors polarization loss. Due to the synergetic effect of dielectric loss and impedance matching, the prepared ZrO 2 /graphene composites show tunable wide-microwave absorption performance by adjusting the heat temperature, and possess a wide absorption band covering the entire X and Ku band. Notably, the ZrO 2 /graphene composites show high thermal stability up to 1000 °C, which presents great potential for microwave absorption applications.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tao Wang,Junling Yu,Jianmin Liu,Feng Jiang,Guo Feng,Jian Liang,Lifeng Miao,Quan Zhang,Qian Wu,Xinbin Lao
A fluorine-free route has been developed to fabricate V/Pr co-doped zircon (ZrSiO 4 ) ceramic pigments with Na 3 VO 4 and Pr(NO 3 ) 3 ·6H 2 O as colourants . The as-prepared pigments were characterized by XRD , Raman, XPS , UV–vis, FE-SEM, TEM and automatic colourimeters . The results show that Na 3 VO 4 can not only act as colourant to produce blue hue, but as mineralizer to accelerate the formation of V/Pr co-doped ZrSiO 4 pigment. A colour tuning between blue, green and yellow can be achieved by increasing the mole ratio of Pr/V, and the most intense yellow hue (L* = 74.55, a* = −0.38, b* = 46.82) is obtained at a mole ratio of Pr/V = 0.5. Both Pr 4+ and Pr 3+ cations are co-existed in the pigments, where Pr 4+ contributes to the generation of yellow hue while Pr 3+ undermines the yellow hue. The good chromatic ability in glaze at high temperature suggest its potential application in ceramic decoration.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Xiaokong Song,Hao Gong,Hongchao Li,Manyao Zhang,Lin Jiang,Chao Wang,Peipei Jiang,Huifen Wang,Kangli Cao,Gang Liu,Qibin Zhao,Tongxiang Fan
Passive radiative cooling materials offer electricity-free cooling by strongly reflecting sunlight and emitting thermal radiation to outer space, presenting a significant potential to reduce energy consumption and carbon emissions . Among these, particle-filled coatings stand out for their ease of processing, cost-effectiveness, and superior cooling performance, making them a promising solution for building cooling applications. However, the practical outdoor application of current particle-filled coatings is hindered by their inadequate abrasion resistance , impacting the coating’s service life significantly. In this study, an efficient daytime cooling coating composed of ZrO 2 particles and silicone acrylate with superior abrasion resistance is presented. By experimentally optimizing the composition, particle size, and volume fraction, this coating achieved a solar reflectivity of 95.7%, an emissivity of 0.978, and an abrasion resistance significantly exceeding that of existing commercial outdoor coatings, at 5310 m ⋅ N/mm 3 compared to the typical 134 m ⋅ N/mm 3 . Even under extensive wear, the coating’s reflectivity only diminished by 0.7%, far less than the 3.8% reduction observed in commercial alternatives, demonstrating its durability under harsh conditions. Moreover, in humid daytime summer conditions, these coatings demonstrate an average temperature reduction of 2.6 °C and a maximum of 7.7 °C below ambient temperature. This work provides new insights in designing durable radiative cooling coatings, paves the way for their practical application in more outdoor applications settings.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
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IF 11.2
Ying Xue,Xianyuan Liu,Xianyong Lu
Hierarchically three-dimensional (3D) materials present a pivotal challenge and opportunity in achieving effective microwave absorption with synergistic effects. In this work, α -Fe 2 O 3 @ZrO 2 with core-shell structure were fabricated in-situ on aramid nanofibers by a solvothermal method . Following calcination , 3D ZrO 2 /Fe 3 O 4 /C nanocomposites with Janus structure have been successfully synthesized. By controlling the lattice match and mismatch in both processes, a core-shell structure of α -Fe 2 O 3 @ZrO 2 and Janus structure of ZrO 2 /Fe 3 O 4 have been well-define performed. The composite material ZrO 2 /Fe 3 O 4 /C-700 has a minimum reflection loss (RL min ) of −67.4 dB at a thickness of 2.0 mm. The effective absorption bandwidth (EAB) at a thickness of 2.4 mm is 6.0 GHz (11.0–17.0 GHz). This study provides a novel strategy for fabricating high-efficiency electromagnetic wave absorption materials with dual synergistic effects in nanosized scale.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
VACUUM
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2023
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IF 4
Haotian Cai,Kamale Tuokedaerhan,Zhenchuan Lu,Renjia Zhang,Hongguo Du
With the development of thin-film optoelectronic components and the increasing requirements for improved integration and performance of ultra-large-scale integrated circuits for devices, finding new high-k gate dielectrics to replace ZrO 2 has become a challenge. Elemental doping is an effective method to further improve the dielectric properties of ZrO 2 . In this work, a novel gate dielectric material was prepared by doping ZrO 2 with the rare-earth element La. The results show that the new gate media material has better performance; these include suppressing the crystallization of ZrO 2 as well as obtaining a large band gap (∼5.74 eV), a large conduction band shift ΔE C (∼2.96 eV), and a low leakage current (∼6.3 × 10 −6 A/cm 2 ). In addition, La doping can significantly suppress the generation of thin-film oxygen vacancies and low-k layers. Furthermore, the leakage current transfer mechanism of the device is systematically investigated. This study provides new insights for selecting a suitable La doping content for the modification of future gate dielectric materials.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2013
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IF 2.145
Gongming Peng,Xicheng Wang,Xiufang Chen,Yijun Jiang,Xindong Mu
Vapor-phase catalytic dehydration of 1,2-propanediol was investigated over Zirconia-supported niobia catalysts. The catalysts exhibit selectivity favoring propanol (approximately 39%) at 85.0% 1,2-propanediol conversion at 290 °C under 1 atm N 2 . The ZrNbO catalysts were analyzed by various techniques; the results indicated that the active sites were weak Brønsted acid sites. A dehydration and hydrogen transfer mechanism was also proposed.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Tianci Xiao,Xiaohao Liu,Guangyue Xu,Ying Zhang
Crystal structure of catalyst support has great influence on its surface and electronic properties. Thus, tuning the crystal phase may adjust the catalytic activity. Herein, we prepared a series of monoclinic, tetragonal and mixed phase of Co/ZrO 2 catalysts, denoted as Co/m-ZrO 2 , Co/t-ZrO 2 and Co/Mix-ZrO 2 . They showed different hydrogenation and hydrogenolysis activities in conversion of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). The characterization and catalytic performance indicated that the interaction between cobalt and t-ZrO 2 resulted in cobalt electron-deficiency and higher concentration of Zr(III) species, which contributed to the higher hydrogenation activity of carbonyl on Co/t-ZrO 2 than Co/m-ZrO 2 . While the hydrogenolysis of C OH group showed higher efficiency on Co/m-ZrO 2 , which was determined by the acid concentration on the surface of catalysts. The combination of both high hydrogenation and hydrogenolysis activities in Co/Mix-ZrO 2 achieved the highest yield of DMF (90.7 %) under mild conditions of 130 °C and 1 MPa H 2 .
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Zhuping Li,Yong Men,Shuang Liu,Jinguo Wang,Keye Qin,Dandan Tian,Tianle Shi,Li Zhang,Wei An
The crystalline phases of support have great influence on their surface and structure properties. Therefore, adjusting the crystalline structure of heterogeneous catalysts imposes a significant impact on the catalytic performance. Herein, a suite of Pd/In 2 O 3 /ZrO 2 catalysts with different crystalline phases of ZrO 2 were prepared and evaluated for CO 2 hydrogenation to CH 3 OH using the same amount of metal loading. The activity data showed the distinct superior reactivity of Pd/In 2 O 3 /ZrO 2 catalyst used mixed monoclinic and tetragonal phases ZrO 2 (Mix-ZrO 2 ) as support as compared to respective single phase of monoclinic ZrO 2 (m-ZrO 2 ) and tetragonal ZrO 2 (t-ZrO 2 ). The catalysts are extensively characterized through BET, XRD, HRTEM, UV–vis, H 2 -TPR, CO 2 /H 2 -TPD and XPS. Combining the characterization results and activity data, the superior activity of Pd/In 2 O 3 /Mix-ZrO 2 catalyst can be correlated with large particle size of Pd nanoparticles, the concentration of oxygen vacancies, and the abundant medium basic sites, which were essential for activation of H 2 and inert CO 2 and enhancement of catalytic performance. The best-performing Pd/In 2 O 3 /Mix-ZrO 2 catalyst exhibited a remarkable reactivity with space time yield (STY) of 0.54 g methanol ·h −1 ·g cat −1 at 573 K and 5 MPa, and stability without noticeable deactivation after 100 h of time on stream, demonstrating its potential as catalyst used in CH 3 OH synthesis from CO 2 hydrogenation.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hao Li,Munan Lu,Yufeng Xue,Wenfeng Qiu
The continuous Nextel™ 720 fiber-reinforced zirconia/alumina ceramic matrix composites (CMCs) were prepared by slurry infiltration process and precursor infiltration pyrolysis (PIP) process. The introduction of submicron zirconia powders into the aqueous slurry was optimized to offer comprehensively good sintering activity, high thermal resistance and good mechanical properties for the CMCs. Meanwhile, the zirconia and alumina preceramic polymers were used to strengthen the porous ceramic matrix through the PIP process. The final CMC sample achieved a high flexural strength of 200 MPa after one infiltration cycle of alumina preceramic polymer and thermal treatment at 1150 °C for 2 h. The flexural strength retention of the improved CMC sample was 104% and 89% respectively after thermal exposure at 1100 °C and 1200 °C for 24 h.
研究领域:
材料科学
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工程学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 5
·1-12
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IF 4.3
Meng Yu,Wang Yitong,Li Guozhu,Liu Guozhu,Wang Li
Primary, secondary and tertiary amino-functionalized zirconia (ZrO 2 −NH 2 , ZrO 2 −NH and ZrO 2 −N) was synthesized by the postgrafting method for the adsorption removal of typical metallic ions, phosphate and total oxidizable carbon from a real H 2 O 2 solution. ZrO 2 −NH 2 , ZrO 2 −NH and ZrO 2 −N exhibited similar pore sizes and sequentially increased zeta potentials. The adsorption results of single and binary simulated solutions showed that the removal efficiency increased in the order of Fe 3+ > Al 3+ > Ca 2+ > Na + . There is competitive adsorption between metallic ions, and Fe 3+ has an advantage over the other metals, with a removal efficiency of 90.7%. The coexisting phosphate could promote the adsorption of metallic ions, while total oxidizable carbon had no effect on adsorption. The adsorption results of the real H 2 O 2 solution showed that ZrO 2 −NH 2 exhibited the best adsorption affinity for metallic ions, as did phosphate and total oxidizable carbon, with a total adsorption capacity of 120.9 mg·g −1 . Density functional theory calculations revealed that the adsorption process of metallic ions involves electron transfer from N atoms to metals and the formation of N-metal bonds.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）