INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Shiju Yang,Xueshuang Yan,Fuzhi He,Zhuliang Chen,Kaizhu Chang,Wan Yang,Futing Xia,Jianjun Chen,Qiulin Zhang
Achieving remarkable activity in selective catalytic reduction of NO by NH3 (NH3-SCR) over CeO2-based catalysts was crucial for their industrial application but still faces a tough challenge, mainly owing to the insufficient acidity and overoxidation ability. Herein, the surface acidity and reducibility of CeO2 catalysts were finely tuned over Mn–W/CeO2 to efficiently eliminate NO and reveal the mechanistic origin of superior catalytic properties. Systematic surface and structure analyses revealed that Mn3O4 interacted with WO3 species in the possible form of Mn–O–W, which could enhance the dispersion of WO3 over the CeO2 surface. The resulting well-dispersed WO3 increased the concentration of both Brønsted acid sites and strong acid sites, effectively suppressing the generation of inactive nitrates and thus providing abundant catalytically active sites for the adsorption and activation of NH3. Importantly, the electron withdrawal from Mn by W atoms associated with the shortened Mn–O bond distance resulted in the appropriate reducibility over Mn–W/CeO2. Accordingly, the undesirable overoxidation of NH3 was weakened, thereby greatly increasing the high-temperature (250–400 °C) NH3-SCR activity. DFT calculations and detailed in situ DRIFTS analysis demonstrated that both “E–R” and “L–H” mechanisms contributed mainly to this superior performance.
研究领域:
催化
·
环境化学
·
表面科学
·
材料科学
·
化学反应工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF STORED PRODUCTS RESEARCH
·
2024
·
IF 2.7
Jingyi Su,Zhaoxin Cao,Yueyang Mao,Wen Shen,Xinyu Wang,Siyu Zhang,Yanqi Chen,Xueme Ge
The S/O/W method of solvent evaporation was utilized in this work for manufacturing poly ( ε −caprolactone) (PCL) microspheres loaded with 1−methylcyclopropene (1−MCP−α−CD) and eugenol (EUG) for temperature- and humidity-regulated EUG release. The composite microspheres with higher encapsulation efficiency (71.39 % ± 2.71 %) were attained by optimizing the rotation speed and mass ratio of PCL to composite powder . The microspheres had good spherical shape without large pores. The rate of release could be managed by different temperature and relative humidity conditions with the release of microspheres (96.82 % ± 0.81 % in 12 days) at the temperature of 60 °C (90 % relative humidity) and (86.50 % ± 2.71 % in 12 days) at the 90 % relative humidity (60 °C). Microsphere encapsulation of EUG and 1−MCP−α−CD was demonstrated by Fourier transform infrared spectroscopy and X-ray diffractometer. Thermal gravity analysis demonstrated that the degradation of EUG@β−CD and 1−MCP−α−CD was delayed after encapsulation. The deterioration of loquat (Baiyu, white-fleshed) can be postponed after treatment of EUG/1-MCP composite microspheres. Relative conductivity, total soluble solids, hardness, color, titratable acid , and weight loss of the loquat were also improved. It could significantly inhibit polyphenol oxidase (PPO) and peroxidase (POD) activities and inhibited browning of loquat tissue. EUG/1−MCP composite microspheres we formulated in this work might be employed to increase the shelf life of loquat.
研究领域:
食品科学
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材料科学
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农业科学
·
采后技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2015
·
IF 2.133
Na Zhao,Siwen Li,Jinyi Wang,Ronglan Zhang,Ruimin Gao,Jianshe Zhao,Junlong Wang
M 2 (PcAN) 2 ( M =Fe, Co, Ni, Cu, Zn and Mn) anchored onto W-HZSM-5 ( M 2 (PcAN) 2 –W-HZSM-5) or the M 2 (PcTN) 2 doping W-HZSM-5 ( M 2 (PcTN) 2 /W-HZSM-5) were prepared and their catalytic performances were tested for oxidative desulfurization in the presence of oxygen. Thiophene (T), benzothiophene (BT), and dibenzothiophene (DBT) were considered as sulfur compounds . Among zeolite-based catalysts, the Cu 2 (PcAN) 2 –W-HZSM-5 and Cu 2 (PcTN) 2 /W-HZSM-5 showed superior desulfurization performance and the activity of selectivity followed the order: T>BT>DBT. The effects of phthalocyanine concentration were studied by UV–Vis and calcination temperature was obtained by TG-DSC for Cu 2 (PcTN) 2 /W-HZSM-5. Catalysts were characterized by EA, IR, XRD , SEM, TEM, ICP , and N 2 adsorption. Reaction time, temperature and the amount of catalyst were investigated as the important parameters for optimization of the reaction. Furthermore, a possible process of oxidative desulfurization and the reaction products were proposed.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Jiaxin Chen,Junjie He,Zihan Zhao,Xin Li,Jie Tang,Qian Liu,Hui Wang
This work aimed to investigate the effects of heat treatments at different temperatures (60, 70 and 90 °C, expressed as HT-60, HT-70 and HT-90) on interfacial composition and protein-lipid co-oxidation in whey protein isolate (WPI)-stabilised O/W emulsions during storage. Compared with control group, all heated emulsions exhibited weaker physical stability over 10 days of storage, which verified by the increased droplet size, as well as decreased adsorbed protein levels and absolute ζ-potential values. Moreover, proteins recovered from the HT-90 emulsion showed the highest fluorescence intensity and red-shift of the maximum emission wavelength, indicating partial unfolding of the protein structure. Meanwhile, severe changes in protein structure were also observed in the HT-70 and HT-90 emulsions, which clearly verified by the degradation of bovine serum albumin, α-lactalbumin and β-lactoglobulin. Furthermore, HT-70 and HT-90 emulsions showed lower levels of lipid hydroperoxides and thiobarbituric acid reactive substances. In contrast, the recovered proteins were subject to severe oxidative stress as indicated by carbonyl and N’-formyl-L-kynurenine. Hierarchical cluster and correlation analysis implied that the process of protein-lipid co-oxidation is inevitable, but it can be retarded by heat treatment. Our results clearly revealed the relevance among heat treatment, interfacial adsorption property, and the protein-lipid co-oxidation of O/W emulsions.
研究领域:
食品科学
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化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiao-Hui Yang,Guo-Hua Zhang
In this study, ultrafine borides powders including (W,Mo)B, (W,Mo)B 2.5 and (Mo,W)AlB were successfully fabricated via boronizing ultrafine W-Mo solid solution composite powder with B 4 C as the boron source under the assistance of Ca melt or Al melt. Ultrafine W-Mo solid solution powder was obtained by using a two-stage reduction route to reduce the precursor powder synthesized by spray drying. Meanwhile, the effects of Mo/W ratio on the phase composition, morphological characteristics and particle size distribution of boride solid solution composite powder were thoroughly investigated. The shift of diffraction peak in the XRD spectrum, the linear change of lattice constant and the homogeneous distributions of W, Mo, B and Al in the EDS energy spectrum comprehensively confirmed that the boride solid solution with different Mo/W ratios could be prepared. Due to the essentially insolubilities of W and Mo in Ca melt, the (W, Mo)B grains grew following a template growth mechanism, and inherited the nearly spherical morphology feature of ultrafine W-Mo solid solution composite powder with a particle size of approximately 200 nm. Nonetheless, as a result of the high solubilities of W, Mo, and B in Al melt, the process of dissolution-precipitation led to the formations of flaky (W, Mo)B 2.5 and short rod-shaped (Mo, W)AlB.
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
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Luyao Huang,Ruru Wu,Fan Zhang,Siqi Yang,Baodong Zheng,Yi Zhang
Achieving food sugar reduction based on odor-taste cross-modal interaction requires careful design of food emulsion systems, which are a promising delivery mechanism with controlled flavor release. Hence, we designed the single (O/W, W/O) and W/O/W double emulsions, which distributed the flavor component (vanillin) and sugar substitute ( d -allulose) in the oil and aqueous phase, respectively. In this work. we acquired the optimal formulations for three emulsions and characterized the physical properties of each emulsion. Furthermore, we investigated the stability of three emulsions under various environmental stresses and found that high-temperature short-time (HTST) sterilization had no effect on the quality of the three emulsions, but autoclaving, heat treatment, and freeze-thawing all caused structural integrity damage to the emulsions. Additionally, the storage results indicated that 4 °C might be the optimal temperature for all emulsions. According to these results, W/O emulsions possess the best overall stability, which has great potential for applications to meet the current sugar reduction strategy.
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2024
·
IF 2.3
Y.J. Fu,H. Wang,Z.M. Xie,R. Liu,X.P. Wang,Q.F. Fang,C.S. Liu,X.B. Wu
Bulk W-0.5 wt%ZrC (W-ZrC), W-1 wt%Re-0.5 wt%ZrC (W-1Re-ZrC), and W-3 wt%Re-0.5 wt%ZrC (W-3Re-ZrC) alloys were prepared and exposed to He 2+ ion irradiation with an incident energy of 500 keV at 400 °C. Post-irradiation analysis revealed the formation of He bubbles, with consistent number density and average size across all alloys. However, the W-3Re-ZrC alloy exhibited a notably higher density of dislocation loops within grain interiors compared to W-ZrC and W-1Re-ZrC. This led to a significant increase in the hardening rate of W-3Re-ZrC to 61.5 %, nearly twice that of the other alloys. By considering the binding energies of He-vacancy, He-He, and Re-He, the formation and growth behavior of irradiation-induced defects, including He bubbles and dislocation loops, were also discussed. This work provides valuable insight into the relationships among Re alloying, He-induced defects, and irradiation hardening in Re-alloyed W materials, thus offering valuable guidance for the design of W-based plasma-facing materials.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
COLORATION TECHNOLOGY
·
2015
·Vol. 131
·期 6
·439-443
·
IF 1.262
Zongqian Wang,Weiguo Chen,Xuewei Zhou,Chaonan Liu,Keith Millington
Bleached silk is rapidly yellowed by exposure to the ultraviolet radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole ultraviolet absorber (such as UVFast W) to bleached silk reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached silk, largely cancelling out the improvements in whiteness achieved during bleaching. Therefore, a series of bleaching processes and aftertreatments using UVFast W on silk were investigated, with the measurement of reflection spectrum, whiteness, yellowness, and strength before and after exposure to ultraviolet radiation. The results show that whiteness of silk treated by oxidation–reduction double bleaching can be increased, and the whiteness of double-bleached silk with 4% UVFast W aftertreatment was even slightly higher than that of the hydrogen-peroxide-bleached silk. After ultraviolet irradiation, double-bleached silk samples with 4% UVFast W treatment resulted in both the highest whiteness and optimum photostability by comparison with unbleached standard silk and hydrogen-peroxide-bleached silk samples with and without 4% UVFast W treatment, and its strength difference was superior to the samples, except for standard silk with 4% UVFast W treatment after exposure to UV radiation for 18 h.
研究领域:
材料科学
·
纺织工程
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1504-1511
·
IF 2.726
He Kai,Liu Shijia,Zhao Guiyan,Qin Yucai,Bi Yanfeng,Song Lijuan
A series of Ni-W catalysts supported on mesoporous SBA-15 with different Ni:W ratios(Ni x W/SBA-15, Ni-5%, x =1, 10, 50) was prepared and fully characterized by powder X-ray diffraction(PXRD), Brunner-Emmet-Teller(BET), transmission electronic microscopy(TEM), H 2 -temperature programmed reduction(H 2 -TPR), and X-ray photoelectron spectroscopy(XPS). High-resolution TEM images, XPS measurements, H 2 -TPR experiments coupled with PXRD results determined the evolution of Ni and W species. It is found that a trace amount of W from H 2 WO 4 can significantly improve Ni dispersion on SBA-15 (Ni 50 W/SBA-15) with Ni 0 and non-stoichiometric WO x species as small as ca . 3.6 nm. The prepared Ni x W/SBA-15 was utilized for CO 2 hydrogenation, which showed that a higher W content restrained the CO 2 hydrogenation while a lower W ratio promoted both conversion rate and selectivity for methane compared with Ni/SBA-15. The Ni 50 W/SBA-15 catalyst showed the best performance with a 93.3% CO 2 conversion rate and 99.7% selectivity for methane at 400 o C under 0.1 MPa and maintained ca . 97% initial performance for 24 h. Tracking product evolution experiments by in-situ Fourier transform infrared spectrascopy(FTIR) indicated that a small amount of W can modify the surface of Ni particles by geometric coverage and electronic modification, which facilitates the adsorption of the CO intermedia and results in the formation of CH 4 . This work provides a new clue to fabricating efficient CO 2 conversion bimetallic materials.
研究领域:
催化化学
·
环境化学
·
材料科学
·
能量转换
·
二氧化碳利用
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 12
·2719
·
IF 3.057
Yan Jiang,Junfeng Yang,Zhuoming Xie,Qianfeng Fang
The biggest obstacle for the application of tungsten as the target materials in the spallation neutron source is its serious corrosion in the coolant of flowing water. For this reason, W–Cr–C clad tungsten was developed by tungsten carburizing in a spark plasma sintering device, with superior corrosion resistance in the static immersion and electrochemical corrosion test. This work focused on its erosion and corrosion performance in a flowing water system, based upon test parameters simulated under the service conditions. W–Cr–C clad tungsten showed superior corrosion resistance to that of bare tungsten due to the corrosion form changing from the intergranular corrosion of bare tungsten to pitting corrosion of W–Cr–C coating. The corrosion rate of tungsten was as high as tenfold that of the coated sample at 20 °C, and at most fourfold at 60 °C after testing for 360 h. Effects of water velocity and temperature on pitting and intergranular corrosion were investigated in detail and their corresponding corrosion mechanisms were analyzed and discussed.Keywords:tungsten;W–Cr–C coating;carburization;intergranular corrosion;pitting corrosion
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 57
·35917-35927
·
IF 3.108
Jun Wang,Aimin Shi,Dominic Agyei,Qiang Wang
Resveratrol is a high-value bioactive polyphenolic compound with vast applications in functional foods; as such, effective and scalable delivery strategies for this compound are worthy of study. In this research, W/O/W emulsions were successfully prepared using polyglycerol polyricinoleate (PGPR) as a lipophilic emulsifier and Tween 80 as a hydrophilic emulsifier with the goal of developing biocompatible carriers to improve the bioavailability of resveratrol. The effects of the type of emulsifier, the concentration of emulsifier, the ratio of the oil phase to the internal water phase, and homogeneous pressure on the physical properties of the W/O/W emulsions (such as microstructure, droplet size, distribution, zeta potential, viscosity and encapsulation efficiency) were investigated. The optimum processing conditions for preparing W/O/W emulsions are as follows: the ratio of the oil phase to the internal water phase is 80 : 20, the concentrations of lipophilic and hydrophilic emulsifiers are 10 wt% and 5 wt%, and the homogeneous pressures in the first and second steps are 30 MPa and 10 MPa. The optimal preparation process of the W/O/W emulsions was used to encapsulate resveratrol. The results showed that at up to 0.040 wt% in the internal water phase (ethanol), resveratrol could be successfully encapsulated in W/O/W emulsions with an encapsulation efficiency of 99.97 ± 0.001%. Moreover, resveratrol was successfully encapsulated in the internal water phase and oil phase together; thus, it was not necessary to increase the amount of carrier materials. This study provides a novel encapsulation formulation to increase the delivery efficacy of resveratrol.
研究领域:
食品科学
·
药物递送
·
生物技术
✓ 已验证
DOI
高影响因子
FUSION ENGINEERING AND DESIGN
·
2023
·
IF 1.7
Bangzheng Wei,Rui Zhou,Dang Xu,Ruizhi Chen,Pengqi Chen,Jigui Cheng
To obtain W/W-10Cu joints with reliable interface bonding, the surface of the W plate was roughened by oxidation–reduction treatment, and the treated W plate was joined to W-10Cu by vacuum diffusion bonding with FeCoCu medium-entropy alloy as an interlayer. The effects of oxidation temperature on the microstructure and properties of the W/W-10Cu joints were investigated. The stability of the obtained W/W-10Cu joints under transient thermal loads was investigated through thermal shock tests. The results show that the surface of the W plate became rough and loose after oxidation–reduction treatment. The surface roughness (Sa) of the W oxidised at 900 °C and then reduced in H 2 at 850 °C was 1.833 μm. The W/W-10Cu joints prepared from this W had a maximum shear strength of 254.0 MPa, 60% higher than that of the W/W-10Cu joints prepared from untreated W (157.9 MPa). After 50 thermal shock tests at 600 °C–RT, the shear strength of the W/W-Cu joints prepared from the treated W oxidised at 900 °C was 111.6 MPa; the shear strength of the W/W-Cu joints prepared from untreated W was 42.7 MPa. This study provides an effective method for preparing high-strength W/W-10 Cu joints.
研究领域:
材料科学
·
连接技术
·
高温材料
·
核材料工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）