ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Yanan Jiang,Yuzhen Fang,Yitian Fu,Runze Xue,Abdul Wahab,Yuan Liu,Cuijuan Zhang
ZrO2 is an effective support for CO2 methanation, but its low surface area limits the dispersion and thus activity and stability of the Ni/ZrO2 catalyst. Herein, a ZrO2/SiO2 support was constructed by dispersing nano-ZrO2 on high-surface-area SiO2 to improve the activity and anti-sintering capability of the Ni catalysts. The results showed that SiO2 stabilized the nano-ZrO2, which further provided favorable sites for dispersing and stabilizing Ni species. Ni/0.4ZS exhibited decent performance among the Ni/xZS catalysts (x was the mass ratio of ZrO2 to SiO2) due to the increased dispersion of Ni. Moderate CeO2 promoter addition further improved the activity and resistance to deactivation due to the increased dispersion of Ni NPs and the enhanced adsorption of CO2. XPS and DFT results indicated that the composite support strengthened the electronic interaction between Ni species and the support. Furthermore, based on the experimental and DFT results, it is proposed that additional geometric stabilization of Ni species may be provided by the spatially constrained sites between adjacent nano-ZrO2 particles. These findings demonstrated that constructing nano-ZrO2 on SiO2 was an effective strategy for developing active and stable Ni-based catalysts for CO2 methanation.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiawen Wu,Wentao Xu,Tianwen Dong,Ming Jin,Youfu Zhou
Incorporating graphene sheets into the ceramic matrix can induce a fine microstructure with unique interfaces, in which the excellent mechanical and electrical properties of individual sheets are packed and applied in bulk quantities. However, further development of graphene-ceramic composites is hindered by the poor distribution uniformity and structural integrity of 2D sheets as well as high anisotropy. Here, a self-assembly strategy based on electrostatic adsorption is proposed for the homogeneous and nondestructive fabrication of graphene oxide-ZrO 2 hybrids. By SPS , dense composites are obtained with improved flexural strength (1187 ± 21 MPa), fracture toughness (8.10 ± 0.04 MPa⋅m 1/2 ) and a percolation threshold below 1 wt%. The common anisotropy in graphene composites is restricted, showing consistent properties on different surfaces. A high correlation between resistance change and deformation has been confirmed, which can be well described by binomial equation. The sensitive and stable sensing performance makes this composite a promising smart material for in-situ self-monitoring.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Xiaokai Li,Xiaojian Mao,Minghui Feng,Junxi Xie,Benxue Jiang,Long Zhang
ZrO 2 is considered an efficient sintering additive for transparent Y 2 O 3 ceramics. However, the doping of tetravalent Zr 4+ ions leads to a dark brown color of the ceramic after vacuum sintering. In this study, the optical properties of vacuum-sintered and air-annealed ceramics were characterized using transmittance spectra and a Commission International de l’Eclairage (CIE) diagram. The corresponding defects are investigated by electron paramagnetic resonance (EPR) spectra. The band gap of the vacuum-sintered samples is 2.72 eV, which is much smaller than that of the annealed sample. The results reveal that the V O + (F + center) and Zr 3+ defects form transition energy levels near the top of the valence band and at the bottom of the conduction band , respectively. The color-related absorption is mainly attributed to the electronic transfer from the Zr 3+ level to the conduction band and from the F + center to the Zr 3+ level.
研究领域:
材料科学
·
无机非金属材料
·
光学材料
·
陶瓷材料
·
固体物理
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 7
·678
·
IF 1.444
Yin Xin,Song Lixin,Xie Xueyao,Zhou Yangyang,Guan Yingli,Xiong Jie
The flexible ZrO 2 /C composite nanofibrous film was fabricated by electrospinning and thermal treatment. Field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffractometer, and Fourier transform infrared spectra were used to characterize the morphology and microstructure of the ZrO 2 /C composite nanofibrous film. The ZrO 2 /C nanofibers exhibited rough surface and had the average diameter of about 230 ± 35 nm. And the ZrO 2 nanoparticles were incorporated in carbon matrix and in tetragonal and monoclinic. The flexural property of the ZrO 2 /C composite nanofibrous film was investigated in detail. The results showed that the flexural property of the nanofibrous film was greatly improved with addition of the ZrO 2 nanoparticles. Besides, with the increase of the contents of ZrO 2 nanoparticles, the flexural modulus of the nanofibrous film decreased, reached a lowest value, and then increased. The lowest flexural modulus of the ZrO 2 /C composite nanofibrous film in precursor concentration of 7.0 wt% was 8.55 ± 0.06 MPa.
研究领域:
材料科学
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纳米科技
·
复合材料
·
功能材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Keqiang Zhang,Qiaoyu Meng,Xueqin Zhang,Zhaoliang Qu,Shikai Jing,Rujie He
The stereolithography additive manufacturing is reported to fabricate ZrO 2 ceramic components with complex-shapes for various military and engineering applications recently. Investigations show that the solid loading of the ceramic suspension exhibits significant influence on the properties of stereolithography additive manufactured ZrO 2 ceramic. However, the intrinsic relationships between the solid loading of the ZrO 2 suspension and the relative density, microstructure, mechanical and other properties of the ZrO 2 ceramic have not been investigated systematically. In this study, the roles of solid loading in stereolithography additive manufacturing of ZrO 2 ceramic were discussed in detail. Firstly, the rheological property, curing behavior of the ZrO 2 suspensions with different solid loading were studied, and the stereolithography additive manufacturing was subsequently conducted. After that, the effects of the solid loading on the phase composition, relative density, mechanical property, microstructure, coefficient of thermal expansion (CTE), and shrinkage of the as-prepared ZrO 2 ceramic were studied in-depth. The relationship between the solid loading of the ZrO 2 suspension and the properties of the ZrO 2 ceramic were successfully revealed. At last, ZrO 2 ceramic components with good shape stability, high precision, and high performance were obtained. It is believed that this paper can give a deep understanding of the stereolithography additive manufacturing of ceramics.
研究领域:
材料科学
·
先进制造
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2014
·
IF 2.086
Yin Xu,Tianyu Ma,Xinhua Wang,Yinzhu Jiang,Mi Yan
Influences of ZrO 2 additive on the microstructure and high temperature oxidation behavior of h-BN/ZrO 2 composites have been investigated. In addition to the enhanced strength , the oxidation reaction between boron and oxygen can be effectively hindered even at 1200 °C when adding 20 wt% ZrO 2 into the h-BN matrix. Besides the doped ZrO 2 particles, ZrB 2 and ZrB were also formed in the composites after sintering via the reaction between ZrO 2 and h-BN. The oxidation product ZrO 2 of these Zr–B compounds can act as protective layer during oxidation, which covers the sample surface and prevents further penetration of oxygen. Good oxidation resistance at 1200 °C and high strength make h-BN/ZrO 2 composites promising materials for high temperature applications.
研究领域:
材料科学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·489-495
·
IF 1.108
Pan Yani,Zhang Jingji,Xu Yu,Gao Yafeng,Chen Zhi,Wang Jiangying
Sulfonated mesoporous ZrO 2 was prepared by a facile one-pot hydrothermal process, using a mixture of ZrOCl 2 ·8H 2 O and sodium dodecyl sulfonate in a NaOH solution, and subsequent calcination of the inorganic/organic intermediate. The influence of NaOH concentration, hydrothermal and calcination temperature on the structural and textural properties of the final products was investigated. Increasing the NaOH concentration gave rise to the transformation from tetragonal to monoclinic and then to tetragonal phase, whereas the increase of hydrothermal temperature led to the tetragonal-to-monoclinic phase transformation. As the NaOH concentration and hydrothermal temperature were increased, a narrow pore size distribution was turned into a multi-modal pore size distribution resulting from regular mesopores and interparticle voids. Accordingly, the incorporated sulfonate anions were oxidized into sulphate anions. After the calcination of 550 °C, the sulfonated products possessed tetragonal crystalline phase with average pore diameter of 4.2 nm and surface area of 108 m 2 g −1 .
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Zhou,Xinghua Shi,Zhenhua Ge,Jing Feng
In this current study, Sm 3 TaO 7 was used as the second phase to fabricate a composite ceramic with 7 wt.% Y 2 O 3 –ZrO 2 (7YSZ). Effective phonon scattering was achieved by controlling the content of the second phase Sm 3 TaO 7 , which significantly reduced the thermal conductivity . The results show that Sm 3 TaO 7 /7YSZ ceramics have a minimum thermal conductivity of 0.81 W m −1 K −1 at 900 °C. The minimum thermal conductivity of the composite was 50% lower than that of 7YSZ. The maximum thermal expansion coefficient was obtained for 5 wt.% Sm 3 TaO 7 /7YSZ ceramics (12.1 × 10 −6 K −1 , 1200 °C), which was much higher than that for 7YSZ (∼10.0 × 10 −6 K −1 ). The hardness and Young's modulus of 5 wt.% Sm 3 TaO 7 /7YSZ ceramics were much lower than those of 7YSZ, which is clearly attributable to the low modulus and hardness of Sm 3 TaO 7 . Our experimental results showed that the 5 wt.% Sm 3 TaO 7 /7YSZ ceramics are excellent thermal barrier coating materials.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Zhipeng Tian,Xuebin Liang,Rongxuan Li,Chao Wang,Jianping Liu,Libin Lei,Riyang Shu,Ying Chen
Catalytic hydrodeoxygenation (HDO) is a popular route to upgrade the pyrolysis lignin-oil that is abundant of phenolic compounds, and the synergistic effect of bimetal enables to improve the catalytic activity significantly. In this work, a series of non-noble metal catalysts are synthesized and their HDO performances of guaiacol are compared. Optimized NiCo/SiO 2 -ZrO 2 catalyst expresses a 100% conversion and a 99.9% selectivity of cyclohexane product, which is higher than those over Ni/SiO 2 -ZrO 2 catalyst. Catalyst characterization results demonstrate that the interaction between Ni and Co promotes the reduction of metal site and the adsorption of hydrogen, which is the crucial factor during HDO process. Besides, the electron transfer from Co to Ni species weakens the C-O bond of substrate intermediate and results in its cleavage to transform cyclohexanol to cyclohexane. This is also the rate determining step in the HDO of guaiacol. Specific kinetic study is conducted to verify the reaction pathway and the structure–activity relationship. The HDO reaction of guaiacol on NiCo/SiO 2 -ZrO 2 fits the first order kinetic model well. The apparent E a of 55.9 kJ·mol −1 is lower than those of the noble metal catalysts reported in previous studies. In addition, the upgrading of raw pyrolysis lignin-oil on this non-noble bimetallic catalyst also achieves a high HDO efficiency, with the hydrocarbon contents increased from 4.2% to 60.6%. The good HDO performance of this cheap and easy-prepared NiCo catalyst proves its promising potential in the upgrading of lignin-oil for the production of hydrocarbon fuels.
研究领域:
能源化学
·
催化科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Dandan Tian,Yong Men,Shuang Liu,Jinguo Wang,Zhuping Li,Keye Qin,Tianle Shi,Wei An
Advances in design concept of oxide-zeolite (OX-ZEO) bifunctional tandem catalysts have demonstrated its potential for highly enhanced selectivity and yield in CO 2 conversion by assigning CO 2 activation and C-C coupling to specific oxide and zeolite , respectively. However, the crystalline structural effects of oxides have not been thoroughly investigated. Here, ZnO/ZrO 2 with different ZrO 2 crystalline phases modulated by Li doping has been used as an oxide catalyst to combine with SAPO-34 as a bifunctional composite catalyst for CO 2 hydrogenation to light olefins . With the transformation of the support ZrO 2 crystalline phase from tetragonal phase to mixed crystalline phase in the catalyst, the CO 2 conversion and yield of target product light olefins were significantly improved. The best-performing ZnO/5Li-ZrO 2 catalyst exhibited a CO 2 conversion of 28.56%, light olefins selectivity of 82.00% with a yield of 8.77% along with good stability under the reaction conditions of 380 °C, 3 MPa, and 6000 mL/g/h. The characterization results by XRD , Raman, HRTEM , XPS and CO 2 -TPD confirmed that the highly enhanced catalytic performance was attributed to the strong interaction between the mixed crystal phase 5Li-ZrO 2 and ZnO, which generated a large number of oxygen vacancies for CO 2 activation. The results indicate that controlling the crystal phase of the oxide support is of prime importance in designing more active and selective oxide-zeolite bifunctional catalysts for high-efficiency CO 2 to light olefins conversion.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yangyang Liu,Baojian Chen,Rui Liu,Wenqi Liu,Xinhua Gao,Yisheng Tan,Zhenzhou Zhang,Weifeng Tu
Catalytic utilizing of CO 2 into valuable olefins on Fe-based catalysts is a feasible way to mitigate the pressure of carbon neutrality. Herein, by investigating the effects of support (SiO 2 , Al 2 O 3 , CNT, and ZrO 2 ) on the structure and catalytic performance of iron catalysts, we have found that ZrO 2 supported catalysts are more beneficial to olefin selectivity and chain growth. The optimization catalytic performance of FeNa/ZrO 2 displays C 2 -C 7 olefin selectivity of 68.2% (O/P = 8.0) with a space time yields (111.4 g Kg cat -1 h −1 ) at X CO2 = 32.7%, 320 ⁰C, 2.0 MPa, CO 2 /H 2 /Ar = 1:3:3, and 9000 mL g -1 h −1 . Characterizations show that the support regulates the composition of the iron oxide phase and the iron carbide phase and induces to form the highest content of Fe 5 C 2 on the spent FeNa/ZrO 2 , which is probably caused by the carbon rich surface and lower disorder of carbon species. Besides, the higher intensity of CO 2 and CO adsorption and lower intensity of H 2 adsorption is confirmed on the surface of the FeNa/ZrO 2 catalysts, leading to a higher ratio of C/H on the surface of the spent catalysts and consequently inhibiting the hydrogenation of olefins. Therefore, the O/P is 8 times as many as that on the FeNa/SiO 2 and FeNa/Al 2 O 3 . Understanding the effect of support on CO 2 hydrogenation to olefins over iron-based catalysts would be significant for precisely designing new catalysts.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·
IF 3.3
Weilong Zhang,Xian Li,Huan Cheng,Jie Yang,Jumei Li
Herein, hollow hZrO2/g-C3N4 composite photocatalysts were successfully fabricated using polymethylacrylic acid (PMAA) nanospheres as sacrificial templates via reflux-precipitation polymerization and subsequent ZrO2 layer coating by sol–gel method over PMAA nanospheres, calcining process, and forming composites with g-C3N4 in sequence. The formation mechanism of the unique composites was proved by FESEM, TEM, XPS, XRD, and EDX mapping characterizations. The photodegradation tests of methylene blue (MB) and ciprofloxacin (CIP) were used to investigate the photocatalytic activity. The results revealed that hZrO2/g-C3N4 exhibited significantly boosted photocatalytic activity for degrading 99.7% methylene blue and 81.5% ciprofloxacin in 120 min under simulated sunlight irradiation (Xe lamp, 500 W), which was much better than that of hZrO2 (42.1% for MB and 19.1% for CIP). The enhanced performance is presumably attributed to the synergetic interaction of the two components and the efficient separation of the photoproduced electron–hole pairs between ZrO2 and g-C3N4, which was verified using photocurrent and EIS characterizations. On the basis of the scavenging studies of free radicals (e−, h+, ˙O2−, and ˙OH), the mechanism of the boosted photocatalytic activity was proposed. More significantly, the composites presented excellent reusability confirmed by cyclic photocatalytic degradation experiments, which is crucial for the sustainable and green applications of photocatalysts.
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
危险品化学品经营许可证（带存储）