CATALYSIS COMMUNICATIONS
·
2024
·
IF 3.4
Yan Kong,Long Tian,Guiming Xie,Xiaorui Wang,Yi Man,Zhou-jun Wang
Molybdenum phosphide (MoP) has attracted increasing attention as a novel catalytic material for CO 2 reforming of methane in virtue of superior coke resistance, but its catalytic reactivity is still relatively low. This work for the first time improved the reforming activity of MoP via ZrO 2 modification. The Zr 0.01 MoP catalyst with Zr/Mo molar ratio of 0.01 possessed much higher activity than bare MoP at 800–900 °C. Structural characterizations revealed that the introduction of ZrO 2 would decrease the particle size, modify the electronic structure and change the reducibility property of MoP, which may function together to deliver the higher activity.
研究领域:
化学工程
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材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fusheng Liu,Yaoyao Xiao,Xinxin Sun,Guohui Qin,Xiuyan Song,Yiyu Liu
Herein, CeO 2 -CaO nanoparticle coated on hollow ZrO 2 nanostructure (denoted as CeO 2 -CaO-ZrO 2 ) was prepared via a template impregnation method, which showed excellent catalytic performance for polycarbonate (PC) transesterification with methanol (named as methanolysis). The lattice oxygen (O 2− ) generated from the incorporation of CeO 2 and CaO to ZrO 2 , adsorbed atomic oxygen (O − ), or adsorbed molecular oxygen (O 2− ) generated from predominately via CeO 2 serve as the active species to promote PC methanolysis. In order to explore the detailed synergistic effect of different components and the influence of structure tailor, the mesoporous CaO-Al 2 O 3 was also investigated and compared with hollow CeO 2 -CaO-ZrO 2 . CeO 2 plays an important role in the storage and release of oxygen and forms stronger O 2− /O − /O 2 − basic sites. Notably, interfacial active species (electron-enriched O 2− /O − /O 2 − sites) participate in stripping protons from CH 3 OH which is the rate determination step for PC methanolysis. Such interfacial sites of CeO 2 -CaO-ZrO 2 catalyst serve as the optimal active site with the substantially declined activation energy barrier (∼0.31 eV) for stripping protons from CH 3 OH in contrast to that of 0.83 eV of CaO-Al 2 O 3 . The activation energy is considerably declined due to the interfacial synergistic component catalysis and abundant activation sites over hollow structure. The PC conversion over such hollow CeO 2 -CaO-ZrO 2 achieved almost 100% under the conditions of temperature 100 °C, m(cat):m(PC) = 0.05:1, n(methanol):n(PC) = 8:1 and time 2 h, while the conversion was only 13.4% over CaO-Al 2 O 3 under the same conditions. The hollow CeO 2 -CaO-ZrO 2 catalyst could be reused for 5 times without obvious decrease in PC conversion and BPA yield. This work supplies an extended understanding on interfacial synergistic catalysis toward PC methanolysis, which is important for efficient design and building of heterogeneous catalysts with higher activity.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yonglong Huang,Zhengkang Duan,Chuan Li,Tian Qiu
The catalytic dehydrogenation of diethanolamine to prepare iminodiacetic acid has attracted considerable research interest. However, the lack of understanding of the structure-activity relationship of the reaction can present a challenge to the control of the catalytic behavior. Concurrently, improving the catalytic performance and reducing the cost have also become urgent issues that require resolution. This work examined the catalytic mechanism of several Cu-Ni X /ZrO 2 catalysts, differing in Cu/Ni ratios, prepared by H 2 reduction, in the context of DEA dehydrogenation to elucidate the structure-activity connection and probable reaction mechanism. Subsequently, a strategy has been put out to generate metal (Ni and Co)-doped copper-zirconium catalysts using the co-precipitation-hydrazine hydrate reduction process. The synergistic effect between metals was combined with the improvement of the surface reaction of the catalyst by hydrazine hydrate through a more efficient preparation method, thereby enhancing the catalyst's overall performance. The representative catalyst Cu-Ni/ZrO 2 required a hydrazine hydrate reduction temperature and time of 40 °C and 30 min, and after 65 min of reaction, it exhibited a high conversion rate (96.3 %) and yield (93.7 %), and after five cycles, both the conversion rate and yield exceeded 85 %. Various characterization techniques have confirmed that Ni doping induced an alloying effect and a size effect. Additionally, the hydrazine hydrate reduction method was discovered to augment the specific surface area, surface hydroxyl groups, hydrophilicity, and optimize the pore size distribution of the catalyst while also regularizing its morphology, thereby significantly enhancing the activity and stability of the metal-doped copper-zirconium catalyst. This paper discussed the correlation between catalyst structure and reaction performance, as well as the catalytic conversion mechanism, which is anticipated to provide a novel reference for the preparation, performance control, and potential applications of dehydrogenation catalysts.
研究领域:
催化化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Surface Topography-Metrology and Properties
·
2020
·Vol. 8
·期 3
·035014
·
IF 1.613
Weiwei Zhang,Cuicui Ji,Qiang Fu,Zhongquan Shi
In this work, the structure and properties of ZrO2 nanoparticle reinforced Ni–W, Ni–B and Ni–Cu matrix nanocomposite coatings were comparatively studied. Their surface morphology, composition, microstructure, topography, hardness, wear and corrosion resistance were examined by various methods . The nanocomposites exhibit dense, nodular-like morphology with nanocrystalline structure. The results show that the ZrO2 particles have homogeneously dispersed in the nanocomposites. The formation of the protrusion structure was partly attributed to the heterogeneous distribution of the electric field. The presence of ZrO2 nanoparticles could refine the crystallite size of the Ni–W, Ni–B and Ni–Cu alloy matrix to 12.5 ± 1, 10.5 ± 0.5 and 15 ± 0.1 nm, respectively. The corrosion resistance of these nanocomposites can be improved by the incorporation of ZrO2 nanoparticles into the alloy matrix. The Ra of Ni–W/ZrO2, Ni–B/ZrO2 and Ni–Cu/ZrO2 nanocomposites are about 53 ± 3, 69 ± 2, 18 ± 1 nm, respectively, expressing the rougher surface of Ni–B/ZrO2 compared to the others. It indicated that the composition of these alloy matrix have different crystallite size, which could affect the surface roughness of the electrodeposits. The inclusion of ZrO2 particles in Ni-based alloys could enhance its properties. The reinforcement effect of the anti-wear properties of the nanocomposites was proposed. The Rct value of the Ni–W–ZrO2, Ni–B–ZrO2, Ni–Cu–ZrO2 were 50.93, 105.18, 44.67 kΩ · cm2, respectively, indicating that the Ni–B–ZrO2 nanocomposite coating has the highest corrosion resistance. The Rct values depends on not only the composition of the coatings, but also the electrodeposition conditions, which influence the crystallize size and compactness of the electrodeposits. The order of the microhardness and anti-wear properties is Ni–W–ZrO2 > Ni–B–ZrO2 > Ni–Cu–ZrO2.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lin Wang,Liguang Yang,Dehua Ma,Chonghe Xu,Xiaojing Liu,Xinzhu Gan,Pinghui Ge,Luyi Zhu,Gaocheng Zhang
In this study, grooved TiO 2 /ZrO 2 ceramic fibers were prepared via coaxial electrospinning, which exhibit enhanced thermal insulation and superior mechanical properties. The fibers were architected with a distinctive core-shell structure, comprising a TiO 2 shell that serves as an effective radiation shield and a ZrO 2 core that maintains mechanical robustness. The interdiffusion of Zr and Ti atoms at the interface facilitated a seamless transition between TiO 2 and ZrO 2 , effectively inhibiting TiO 2 grain coarsening and substantially enhancing the tensile strength of the fibers, exemplified by the 1.47 ± 0.08 MPa achieved in the TZ-5 sample. Through control of the injection rate during electrospinning, we optimized the fibrous morphology to attain a synergistic balance of strength, flexibility and thermal insulation. The fibers showcased exceptional thermal insulation properties with thermal conductivity values ranging from 0.0294 to 0.0278 W m −1 K −1 and an average infrared reflectance exceeding 87 %. Practical thermal insulation tests confirmed the superior insulation performance of the TiO 2 /ZrO 2 fibrous membranes.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advances in Applied Ceramics
·
2019
·
IF 1.429
Guangyuan Yang,Sanwen Peng,Zheming Li,Zhixiong Huang
Carbon fibres (CF) have been used in various fields because of their unique properties. However, the oxidation resistance ability of CF is not good enough. The paper discusses the issue of using composite plating method to deposit SiC–MoSi2–ZrO2 coating at the surface of CF. The plating factors, including nanoparticle concentration, plating bath temperature, current density, agitation rate and electroplating time, which affect the structure and performance of coating have been discussed. The energy dispersive spectrometer has been applied to test the mass fraction of nanoparticles in the coating. Also, the surface morphology of coated CF has been characterised by a scanning electron microscope and the antioxidation ability of each sample has been tested by the weight difference method. The results indicate that with the proper plating factors, the coating can improve the antioxidation performance of CF and its reinforced composites. The residual weight of coated CF is over 52% after 1400°C oxidation for 15 min.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Lei Liu,Yong Wang,Chenye Gao,Cheng Yang,Ke Wang,Haibin Li,Haitao Gu
Coating inorganic ceramic particles on commercial separators with organic binders attracts significant interest as a facile and effective modification method to enhance the thermal-resistance characteristics of the separators. Nevertheless, this method still suffers from some inherent limitations, involving the desquamation of binders soaked in the electrolytes and a significant thickness increase caused by ceramic coatings . Herein, we introduce self-assembled nano-thick ZrO 2 ceramic coatings onto a polypropylene (PP)/polyethene (PE)/PP separator using a dopamine hydrophilic modification and a subsequent surface sol-gel process. In comparison with the pristine separator, the modified separator exhibits excellent mechanical properties, favorable electrolyte wettability , enhanced thermal-resistance characteristics, elevated ionic conductivity and smaller electrochemical impendence. At high temperature (55 °C), the LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)//Li coin cell based on S–10ZrO 2 exhibits the highest specific capacity of 203.7 mAh g −1 , which is higher than that of the NCA//Li coin cell using the PP/PE/PP separator. In addition, the reserve experiments at various high temperatures reveal that the cells with S–10ZrO 2 are more stable than the others, holding 4.08 V even for 12 h of storage at a high temperature of 120 °C.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Jie Ding,Wenxin Zhao,Letian Zi,Xin Xu,Qiang Liu,Qin Zhong,Yu Xu
This study is to convert renewable H 2 and increasingly concerned CO 2 to ethylene or C 2 H 4 over Fe 3.33 Co 1.67 K 5 /ZrO 2 and Fe 3.33 Co 1.67 K 5 /Al 2 O 3 catalysts. The ZrO 2 support provides amounts of surface oxygen vacancies (OVs) as well as stable and rich surface hydroxyl groups (-OH), which promotes the Fe 3.33 Co 1.67 K 5 /ZrO 2 catalysts with 5% Fe and Co loadings to achieve C 2 H 4 space time yield (STY) of 0.064 mmol C2H4 ∙m −2 cat ∙h −1 at 290 °C and 2.0 MPa, while the Fe 3.33 Co 1.67 K 5 /Al 2 O 3 catalysts only reach C 2 H 4 STY of 0.009 mmol C2H4 ∙m −2 cat ∙h −1 at 330 °C and 2 MPa Fe 3.33 Co 1.67 K 5 /ZrO 2 catalysts are very promising for converting the captured CO 2 and renewable H 2 to highly demanded C 2 H 4 . This work not only provides a guideline for developing efficient catalysts but also advances the mechanistic understanding of catalytic CO 2 hydrogenation.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 9
·096507
·
IF 3.1
Yiwei Sun,Fenjuan Shao,Yuting Luo,Haoxiang Wang,Yuyang He,Liying Sun,Dongpo Xu
An efficient molecularly-imprinted electrochemical sensor for the detection of ampicillin was prepared using polypyrrole tetracycline polymer modified with ZrO2 nanofibers. The ZrO2 nanofibers prepared by electrostatic spinning increased the surface area of the electrode with the binding sites of the electropolymerized membrane. The ampicillin sensor with polypyrrole as the functional monomer was able to specifically bind ampicillin molecules and detect ampicillin in various types of samples. In this study, cyclic voltammetry and differential pulse voltammetry were used to evaluate the electrochemical performance of ZrO2-MIP. Under the optimized conditions, the detection limit of this sensor was 0.397 nM, the detection range was 0.5 ∼ 500 nM, and the R2 reached 0.998. It has good selectivity, reproducibility, and stability, and achieves the AMP detection of the milk of the actual samples, which has a good prospect of application.
研究领域:
生物传感技术
·
药物分析
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Tengda Shi,Zhexiang Tang,Pei Liang,Xiubing Zhang,De Zhang,Qinchao Shao,Jie Huang,Zhi Yu,Yongquan Xu,Hongping Chen
The spectroscopy of surface-enhanced Raman scattering (SERS), with its high sensitivity and specific chemical fingerprinting, has received increasing attention. A stable substrate is extraordinarily important for the trace detection of the SERS technique, but the challenge of SERS substrate production with high stability and uniformity still imposes the unavoidable barriers. In this paper, we design a multilayer core–shell-nanostructured ZrO2@Ag@SiO2 nanoparticle through liquid extraction. First, we regulated the usage of AgNO3 (1 wt %) to obtain Ag@SiO2 which is silver coated with uniform distribution; on the surface of silica, the number of silver particles is abundant. Then, we discussed the influence when different concentrations of zirconium propoxide are added on the zirconia layer’s thickness. Then, we applied FDTD simulation to explain the position of SERS “hotpots” with and without ZrO2 coating. We have found that the detection capability of ZrO2@Ag@SiO2 can be up to 10–9 M for 4-ATP; with ZrO2@Ag@SiO2 SERS substrates exposed to the atmospheric environment for up to 30 days, we could still obtain the excellent SERS signal performance contributed by the good chemical stability of ZrO2, when ZrO2 is coated on the surface of Ag@SiO2, the zirconia layer formed has a protective role . These experimental results have indicated that the outer zirconia layer could prevent the silver surface from being oxidized, ensuring its stability , which is quite crucial for the applied SERS.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Hongli Liu,Guoqing An,Hongyan Li,Zhong Chen,Jing Li,Yajing Li
The SiBCN-ZrO 2 hybrid ceramic aerogels were fabricated by pyrolysis of preceramic aerogels prepared from Polyborosilane/Zirconium 5n-butoxide /Divinylbenzene (PSNB/ZBO/DVB) combining a simple hydrosilylation reaction with CO 2 supercritical drying. The micromorphology and pore structure parameters of the preceramic hybrid aerogels were investigated. Structural evolution of the ceramic hybrid aerogels and the crystallization behavior were studied by scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that all the preceramic hybrid aerogels had a typical mesoporous structure. The neck region between the particles of SiBCN-ZrO 2 ceramic hybrid aerogels was gradually increased when the sintering temperatures increased from 750 °C to 1550 °C. After heat treatment at 1550 °C, the specific surface area and pore volume for the samples were drastically reduced down to 108.85 m 2 g −1 and 0.49 cm 3 g −1 , respectively. The ZrO 2 nanocrystals were well-distributed in amorphous SiBCN network backbone, the final crystalline phases were composed of hexagonal BN, β-SiC crystals and monoclinic ZrO 2 .
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2021
·
IF 6.766
Lijie Pei,Jianxin Cao,Fei Liu,Anjie Yang,Mengqin Yao,Tianxiang Zhao,Xiaodan Wang,Sibudjing Kawi
The catalytic properties of bifunctional ZSM-5@t-ZrO 2 catalyst for methanol thiolation were revealed by using methanol and H 2 S as probe molecules. Taking the ZSM-5/t-ZrO 2 physically-blended catalyst, pure ZSM-5 and t-ZrO 2 as control catalysts, we investigated the characteristics of adsorption and transformation of different reaction molecules on or over different catalysts by combination of in-situ diffuse reflectance Fourier transform infrared spectroscopy (Drifts) and a variety of techniques including XRD, XPS, XRF, FT-IR, N 2 adsorption-desorption, CO 2 /NH 3 -TPD, and DSC. The results showed that the synergistic effect of acid sites between ZSM-5 phase and t-ZrO 2 phase in the bifunctional catalyst enhanced the adsorption and dissociation of methanol molecules, while the base sites in t-ZrO 2 phase were mainly responsible for the adsorption and dissociation of H 2 S molecules. Due to the small specific surface area of pure t-ZrO 2 catalyst, precursor species for sulfur deposition and carbon deposition were easily formed. Presulfurization could improve the initial activity of methanol thiolation and shorten the induction period. The dissociation of H 2 S at the base sites was the rate-determining step of the bimolecular reaction, and the appropriate increase of base sites in the bifunctional components could construct the matching formation rate of sulfhydryl and methoxy groups. At the same time, the special composite structure and meso-microporous system of ZSM-5@t-ZrO 2 could effectively reduce the formation rate of carbon and sulfur deposits.
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
危险品化学品经营许可证（带存储）