INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shuxing Zhang,Xiaoshu Ding,Yanji Wang
5-Amino-1-pentanol is an important pharmaceutical intermediate used in the synthesis of anti-inflammatory and anticancer drugs. The direct hydrogenolysis of furfurylamine to 5-amino-1-pentanol has the advantages of a simple process route and high atom utilization. In this paper, for Pt/ZrO2 catalysts, the effects of different Pt loading and calcination temperatures on catalyst activity, selectivity, and surface properties such as Pt nanoparticle size, acidity and alkalinity, and the ratio of Pt0/(Pt0+Pt2+) were investigated. Through the study of the relationship between catalyst preparation conditions, furfurylamine hydrogenolysis reaction performance, and surface properties, it was found that moderate Pt nanoparticle size, higher Pt0/(Pt0+Pt2+) ratio, and more acidic sites favored furfurylamine hydrogenolysis. The higher number of basic sites favors the dispersion of Pt metal. The results of in situ FTIR show that the amino group of furfurylamine is adsorbed on the acidic site of Pt/ZrO2, and the furan ring is adsorbed on Pt nanoparticles, which is beneficial to the hydrogenolysis of furfurylamine.
研究领域:
催化化学
·
药物合成
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hang Liu,Zhihao Qu,Yanchang Liu,Junlong Liu,Siye Tian,Yuhong Zhang
In this paper, Au nanoparticles (AuNPs) loaded ZrO 2 /ZnSnO 3 nanocubes are prepared through hydrothermal route and chemical reduction method. The crystal structure, morphology, element distribution, chemical composition, specific surface area and pore size of ZrO 2 /ZnSnO 3 nanocubes are described with XRD, TEM, XPS and BET. Interestingly, the incorporation of Zr ions induces the fragmentation of the edge of ZnSnO 3 nanocubes, which enhance specific surface area of ZrO 2 /ZnSnO 3 nanocubes. The response of ZnSnO 3 materials for isopropanol is increased through doping ZrO 2 and modifying AuNPs. The 1.5 at% AuNPs-loaded 5 at% ZrO 2 /ZnSnO 3 nanocubes presents a higher response to 100 ppm isopropanol with a fast response/recovery time (3/4 s) at the operating temperature of 260℃. And the generation of ZnSnO 3 , ZrO 2 and AuNPs heterojunctions contributes to raise the isopropanol response. In addition, the catalysis of ZrO 2 and AuNPs also can increase their reaction speed between absorbed oxygen and isopropanol molecules. This research results provide a new scheme for the development of isopropanol sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Ling Zhou,Jie Yang,Xinyue Wang,Gao Song,Fan Lu,Lijun You,Jumei Li
A novel highly active surface enhanced Raman scattering (SERS) substrate of Ag nanoparticles decorated Ag@ZrO 2 composite nanosphere was prepared and characterized. A uniform ZrO 2 shell was firstly coated over Ag cores by sol-gel process using zirconium butoxide as Zr precursor to achieve Ag@ZrO 2 nanospheres and then Ag nanoparticles were in situ deposited on the Ag@ZrO 2 through the reduction of AgNO 3 to produce Ag@ZrO 2 @Ag composite nanospheres. The cover density of Ag nanoparticles on Ag@ZrO 2 @Ag nanospheres could be controlled by changing the concentration of AgNO 3 . TEM , FE-SEM, EDX, UV–vis and XRD analyses were used to characterize their morphology, structure and composition . The SERS property of Ag@ZrO 2 @Ag was evaluated using 4-mercaptobenzoic acid (4-MBA) as Raman probe molecules. The experimental results showed Ag@ZrO 2 @Ag nanospheres presented remarkably SERS activity, high signal reproducibility (RSD = 6.39%) and exceptional storing stability. Subsequently, the Ag@ZrO 2 @Ag nanospheres acted as SERS substrates to sense Cr (VI) in water at various concentrations, and the SERS results showed great linear correlation between SERS intensities and the concentration of Cr (VI) (R 2 = 0.97) with the detection limit of 0.5 μM, which is below the safety level (1 μM) in drinking water of United States Environmental Protection Agency. The Ag@ZrO 2 @Ag nanospheres were also successfully used to confirm the concentration of Cr (VI) in real industrial wastewater. These results demonstrated the extraordinary potential of Ag@ZrO 2 @Ag composite nanospheres serving as SERS substrates for trace and quantitative determination of Cr (VI) in environmental field.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Chenglong Wen,Jundong Xu,Xueman Wang,Yu Fan
A novel SO42–/ZrO2@SAPO-11 (SZ@SA-11) composite was synthesized via a two-step method, and the corresponding SZ@SA-11 supported Pt catalyst was applied to catalyze n-heptane hydroisomerization. First, UiO-66@SAPO-11 is produced by the growth of UiO-66 on SAPO-11 due to the covalent bonds between Zr and the oxygen in the hydroxyl groups of SAPO-11. Then, UiO-66@SAPO-11 is decomposed to form ZrO2@SAPO-11 via calcination in air, and the SZ@SA-11 composite is obtained by the impregnation of ZrO2@SAPO-11 with (NH4)2SO4 and subsequent calcination. Compared with the physical mixture of SO42–/ZrO2 and conventional SAPO-11 (SZ+SA-11), SZ@SA-11 possesses smaller ZrO2 particles and more tetragonal ZrO2. Moderate and strong Brønsted acid sites (MSBAS) are produced only via interactions between tetragonal ZrO2 and sulfate, so SZ@SA-11 with more tetragonal ZrO2 has a greater amount of MSBAS than SZ+SA-11. These advantages of SZ@SA-11 endow the corresponding Pt/SZ@SA-11 catalyst with a better performance for n-heptane hydroisomerization compared to Pt/(SZ+SA-11). In addition, compared with the other counterparts such as Pt/SZ and Pt/SA-11, Pt/SZ@SA-11 presents higher selectivity for total isomers (91.5%), higher selectivity for multibranched isomers (22.6%), and a lower cracking selectivity (8.1%) in n-heptane hydroisomerization. The strategy proposed herein provides a new insight into the acidity adjustment of the molecular-sieve-based catalysts for hydrocarbon hydroisomerization.
研究领域:
催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 7
·1818-1824
·
IF 2.162
Yufeng Huang,Yakai Feng,Xujun Sun,Ying Han,Dongshun Liu,Xiaohua Tan
Organic silicones have been used as encapsulant materials for light-emitting diodes (LEDs) for many years, while their performances need to be improved in order to satisfy the requirements of high-power LEDs. A ZrO 2 /silicone hybrid resin (ZHR) was synthesized for LEDs encapsulation by in situ sol-gel reactions. The oligosiloxane was synthesized as polymeric matrix by nonaqueous sol-gel condensation using diphenylsilanediol (DPSD), vinyltrimethoxysilane (VTMS), and 3-methacryloxy propyl trimethoxysilane (MPTMS) as monomers. Then zirconium propoxide was added into this polymeric matrix to be hydrolyzed to obtain the hybrid resin with a uniform dispersion of ZrO 2 nanoparticles. The Si–O–Zr covalent bond was detected and benefited for excellent dispersibility of the ZrO 2 nanoparticles and the well compatibility between organic and inorganic phases. The cured ZHR with 5 wt% ZrO 2 content showed high light transmittance (greater than 80% in visible light range), high refractive index (=1.56), and high thermal stability (no yellowing at 150°C for 240 hours). The luminous flux of the LED chip with ZHR encapsulant was 10% higher than that of the pure silicone resin, suggesting that ZHR has great application potential in the field of LED packaging.
研究领域:
材料科学
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化学工程
·
光电
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2024
·
IF 3.3
Rongfang Zou,Xiaohong Han,Yang Meng,Wenbin Chen,Zhiyun Shi,Yilin Lian,Fangping Wang,Mingzhen Wang,Yang Huang
Fixed partial dentures are the primary treatment for dentition defects. Digital light processing (DLP) 3D printing technology is an advanced technique with significant advantages and potential in the field of dental restoration, particularly in cases requiring high precision and personalization. However, challenges persist in printing fixed partial dentures that meet the strength requirements for clinical applications. In this study, we aimed to optimize printing parameters, including exposure time and layer thickness, to enhance dimensional accuracy, reduce warpage, and improve the surface quality of the samples. Additionally, we focused on the rheological and curing properties of the paste. The optimal combination of printing parameters was found to be 5 s of exposure time and 50 μm layer thickness, achieving superior dimensional accuracy, reduced warpage, and improved surface quality. For a slurry with 40% solid content, the dispersant KOS 110 demonstrated the best shear thinning effect, with an optimal addition of 2%. Notably, the Vickers hardness, flexural strength, and fracture toughness of the ZrO 2 fixed partial dentures were 13.52 ± 0.21 GPa, 940 ± 20 MPa, and 6.92 ± 0.25 MPa·m1/2, respectively, which surpasses that of human enamel (4 GPa) and is comparable to CAD/CAM ZrO 2 (900–1200 MPa). This study demonstrates that DLP technology can be effectively used to fabricate ZrO 2 personalized complex fixed partial dentures with excellent mechanical properties and high precision, offering broad application prospects in stomatology.
研究领域:
口腔医学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2015
·
IF 3.52
Hao Wang,Zhenyu Yao,Xuchun Zhan,Yan Wu,Min Li
A microwave hydrothermal (MWH) method was used to deposit WO 3 onto ZrO 2 –Al 2 O 3 with various ZrO 2 contents to prepare hydrodesulfurization (HDS) catalysts with high WO 3 loading (23 wt%) close to industrial hydrotreating, for achieving high W dispersion and weak W-support interaction. The catalysts with the same WO 3 and ZrO 2 contents were prepared by a conventional impregnation (IM) method as reference. The effects of catalyst preparation methods and ZrO 2 contents on the catalyst property and dibenzothiophene HDS activity were investigated. The results show that the MWH method leads to highly dispersed octahedrally coordinated W species which are weakly linked on ZrO 2 –Al 2 O 3 and easy to be reduced; no bulk WO 3 crystallites are observed even at high ZrO 2 content (50 wt%). Therefore, it causes better sulfidation and shorter WS 2 slabs. Contrarily, the IM method induces W species to agglomerate into bulk WO 3 crystallites which are poorly dispersed and hard to be reduced, which is further aggravated by ZrO 2 . The HDS activity of the MWH-prepared catalysts significantly increases with ZrO 2 up to 40 wt% ZrO 2 . This catalyst shows 2 times higher rate constant and 1.64 times higher efficiency of HDS than the IM-prepared catalyst with the same ZrO 2 content. For the IM-prepared catalysts, the HDS activity slightly increases at small amount of ZrO 2 (10 wt%) and then decreases drastically.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mao Chen,Zijie Song,Haoyuan Lei,Hailong Wang,Shaojun Zhang,Rui Zhang,Hongxia Li,Bingbing Fan,Yongqiang Chen
Customized porous Al 2 O 3 -ZrO 2 -mullite composites were designed and prepared by reaction sintering of zircon (ZrSiO 4 ) and alumina (Al 2 O 3 ) at sintering temperatures from 1400 to 1600 °C for 3 h. The mechanical properties , microstructural evolution , and reaction mechanisms of the composites were investigated. The reactions between ZrSiO 4 and Al 2 O 3 were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS). The results indicate that ZrSiO 4 and Al 2 O 3 react and form ZrO 2 and mullite . Sintering temperature has an important effect on the reaction process. At 1400 °C, Al 2 O 3 reacts directly with SiO 2 of ZrSiO 4 to form mullite and ZrO 2 , which reduces the decomposition temperature of ZrSiO 4 and promotes the decomposition of ZrSiO 4 . However, at 1600 °C, ZrSiO 4 first decomposes to form SiO 2 and ZrO 2 , and then generates mullite by the diffusion of Si. The migration of Si is the key factor for the formation of mullite. The thermal shock resistance of the composites can be significantly improved by phase transformation toughening of in-situ ZrO 2 . Therefore, increasing the proportion of ZrSiO 4 can significantly improve the mechanical properties of sample. The residual ratio of the flexural strength after thermal shock exceeded 90%, when the mass ratio of ZrSiO 4 to Al 2 O 3 was 3:1. Besides, the addition of polymethyl methacrylate could improve the porosity of materials and has a direct effect on the thermal conductivity of composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yihang Fang,Nan Chen,Guoping Du,Mengxian Zhang,Xianrui Zhao,Jianbo Wu
The aim of this study was to improve the mechanical properties of Al 2 O 3 ceramics by the addition of Y 2 O 3 -stabilized ZrO 2 whiskers (designated as Al 2 O 3 /YSZ W composite) through the flux method and hot-pressing technology. The effect of YSZ W content on their microstructure , phase composition and transformability, mechanical properties, and wear resistance was systematically investigated. The Al 2 O 3 /YSZ W composites containing 10 wt% YSZ W exhibited the best mechanical performance, including the highest content of YSZ W tetragonal phase and transformability as well as the largest values in their relative density (99.5%), hardness (1969 HV), fracture toughness (9.57 MPa m 1/2 ) and flexural strength (855 MPa). The strengthening and toughening of the Al 2 O 3 /YSZ W composites were attributed to the YSZ W tetragonal-monoclinic phase transformation as well as the whiskers reinforcing effect. Furthermore, the Al 2 O 3 /YSZ W composites also showed the highest friction and wearing properties.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Haiyan Yang,Yang Zhou,Dongshen Tong,Miao Yang,Kai Fang,Chunhui Zhou,Weihua Yu
Cellulose is the most abundant form of biomass on earth, and is considered as an alternative for fuels and chemicals. The hydrolysis of cellulose to platform compounds, such as reducing sugars (RS), is one of the most important ways for the utilization of cellulose. In this study, the solid acid catalysts of SO 4 2− -ZrO 2 /montmorillonite (SZ-Mt) were prepared by coupling SO 4 2− with ZrO 2 and then introducing into the interlayer of Mt using the coprecipitation method. Meanwhile, the catalytic performance of the SZ-Mt catalysts for the hydrolysis of cellulose to RS in water was studied. The catalysts were characterized by XRD , FT-IR, BET, SEM(EDS), NH 3 -TPD and XPS . The catalytic results showed that the SZ-Mt composite calcined at 500 °C with the molar ratio of S/Zr of 0.3 showed the highest total reducing sugars yield of 30.1%. The characterization results revealed that the surface S O bonds of sulfated zirconium oxide could gradually change from O=S-OH groups (type I, -HSO 4 ) to O=S=O groups (type II, -S 2 O 7 ). It was concluded that the surface S-OH groups in type I were responsible for the hydrolysis of cellulose in the low molar ratio of S/Zr and the new S-OH bonds formed by breaking the S-O-S bonds in type II were contributed to the conversion of cellulose in the high molar ratio of S/Zr. Finally, the mechanism of cellulose hydrolysis on the SZ composites was suggested.
研究领域:
化学工程
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xu Rui,Chen Jiansong,Zhao Shijiao,Hao Shaochang,Zhao Xingyu,Li Jianjun,Deng Changsheng,Ma Jingtao
The internal gelation process was combined with a co-axial capillary microfluidic device to prepare monodisperse ZrO 2 ceramic microspheres . Large sized gel microspheres in the range of hundreds of micrometers could be produced with the capillary microfluidic device with co-axial flow structure and the large sized outlet tubing. After drying and sintering, large sized ZrO 2 ceramic microspheres (>200 μm) which had good sphericity and narrow size distribution were prepared.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
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
危险品化学品经营许可证（带存储）