Journal of Cleaner Production
·
2020
·
IF 7.246
Shanshan Shao,Xinggang Hu,Wenbin Dong,Xiaohua Li,Huiyan Zhang,Rui Xiao,Yixi Cai
Aldol condensation of biomass-derives coupled with hydrogenation is a promising route for the production of renewable aviation fuel. In this study, a bifunctional catalyst was prepared to integrate the aldol condensation of cyclopentanone and hydroprocessing for aviation fuel in one pot. Due to its strong mild-basic sites, Mg–Al–O performed the best with the total yield of dimer and trimer of 80.4%. Nickel was screened out to be favorable for hydrogenation. Considering the unsatisfactory porous structure of Ni/Mg–Al–O, the bifunctional catalyst was prepared with activated carbon (AC) as carrier. With Ni loading of 20 wt%, the maximum yield of targeted alkanes reached 81.1% over Ni/Mg–Al–O/AC. The calcination and reduction temperature in the preparation process were both optimized at 550 °C. In the reusability test, the yield of targeted alkanes reduced to 31.6% in the 5th run. To attenuate the hydration effect, n-pentane was introduced as solvent, and the bifunctional Ni/Mg–Al–O/AC performed stably in 5 runs. By the design of bifunctional catalyst based on the theoretical basis to realize the integration of C–C coupling and hydrogenation in one pot, it will promote the development of aviation fuel from biomass in a more sustainable and green way.
研究领域:
催化化学
·
能源化学
·
绿色化学
·
生物燃料
·
应用化学
·
材料化学
·
工业催化
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Chonghai Wang,Haiming Cheng,Changqing Hong,Xinghong Zhang,Tao Zeng
A chopped carbon fibre (CF) reinforced silica-phenolic resin (Si/PR) aerogel nanocomposite was prepared through a simple one-pot sol-gel polymerization in a slurry of CF, PR, silane , hexamethylenetetramine and ethylene glycol. CFs were distributed homogeneously and randomly in the Si/PR aerogels. The Si/PR aerogels exhibit finer microstructure , higher thermal stability and better anti-oxidation resistance than PR aerogels. The compressive strength for the composites with low densities between 0.402 and 0.463 g/cm 3 ranged from 0.33 to 2.44 MPa and thermal conductivities from 0.089 to 0.116 W/(mK), respectively. Furthermore, the CF/Si/PR aerogel nanocomposites could deliver linear ablation rates as low as 0.117 mm/s, and internal temperature peaks approximately 100 °C at 38 mm in-depth position as the surface temperature exceeded 1800 °C in oxyacetylene flame. From mentioned above, this lightweight composite presents huge application prospects in thermal protection and heat insulation field, especially in aerospace industry.
研究领域:
材料科学
·
高分子化学
·
复合材料工程
·
航空航天材料
·
热力学与传热学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 4
·412-419
·
IF 0.935
Xiu-Yan Dong,Sunday Folaranmi Akogun,Wei-Min Zhou,Wen-Kui Dong
A new tetranuclear Zn(II) complex, [{Zn(L)(μ-OAc)Zn(H 2 O)} 2 ], based on an asymmetrical salamo-type bisoxime chelating ligand H 3 L (6-hydroxy-4′-chloro-2,2′-[ethylenediyldioxybis(nitrilomethylidyne)]diphenol) was synthesized and characterized by elemental analyses, differential thermal methods, single-crystal X-ray crystallography, and IR, UV–vis, and fluorescence spectra. The Zn(II) complex crystallizes in the triclinic system, space group P -1 with cell parameters a = 9.0742(6) Å, b = 11.8225(5) Å, c = 12.4182(8) Å, Z = 2, V = 1212.56(12) Å 3 , R 1 = 0.0572, and wR 2 = 0.1734. The environment of the tetranuclear Zn(II) complex is penta-coordinated having a slightly distorted trigonal bipyramidal geometry. Moreover, a 1D chain supramolecular structure is formed along the c -axis by the intermolecular C1–H1B⋯O14 hydrogen bonds; in the same manner, C2–H2C⋯Cg2 functions in the formation of supramolecular structures along the a -axis of the 1D chain. A 2D supramolecular structure along the ac plane extends infinitely under the force of intermolecular hydrogen bonds. Differential scanning calorimetry-thermogravimetry thermal analysis provides evidence of the coordination of Zn(II) atoms to the ligand H 3 L. The Zn(II) complex shows intense photoluminescence with a maximum emission at ~453 nm upon excitation at 360 nm.
研究领域:
无机化学
·
配位化学
·
超分子化学
·
材料化学
·
分析化学
·
物理化学
·
晶体学
✓ 已验证
DOI
高影响因子
NEW CARBON MATERIALS
·
2021
·
IF 1.905
Xu Du,Hui-min Yang,Yan-lan Zhang,Qing-cheng Hu,Song-bo Li,Wen-xiu He
Nanostructured phenolic resin-based carbon aerogels with an extensive network structure are regarded as ideal energy storage materials for supercapacitors. However, the initial bulk form and low capacitance of previously reported porous carbon aerogels are problematic for practical use. Phenolic resin-based porous carbon spheres were synthesized by a simple hydrothermal process using ammonia, ethylenediamine or hexylenediamine as a catalyst. The porous carbon spheres were investigated by SEM, BET, XPS, etc. It was found that the number of ammonium groups, length of the alkyl chain and processing temperature play vital roles in determining the pore structure, size and uniformity of the carbon spheres. NH 4 + is necessary to obtain the carbon spheres and but changing the other parameters has no obvious effect on their crystal structure. The sample prepared at a hydrothermal temperature of 80 °C using ammonia as the catalyst has the highest specific capacitance of 233.8 F g −1 at a current density of 1.0 A g −1 . It has an excellent capacitance retention of 98% after 10,000 charge/discharge cycles at 7 A g −1 , indicating its good cycling stability and rate capability. This result shows that a higher specific surface area, porosity and defect density are probably the crucial factors in improving the electrochemical capacitance.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
高分子化学
·
表面科学
·
物理化学
✓ 已验证
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 12
·1-17
·
IF 2.9
Wang Tong,Yang AiGuo,Zhang JiuBing,Gan WeiJiang,Zhou Fan,Ran ZhaoJin,Wang ZhongMin
Pesticide residues in water can cause varying degrees of damage to the ecological system and human health, attracting widespread attention. During this research, a cost-effective, easily synthesized, and high surface area mesoporous poly (melamine–formaldehyde) (mPMF) was employed as an adsorbent to effectively absorb forchlorfenuron (CPPU) pesticide from water. The maximum adsorption capacity and maximum adsorption effectiveness were found to be 231.43 mg/g and 81%, respectively. The study of adsorption kinetics revealed that the adsorption mechanism conforms to a quasi-second-order kinetic model, indicating that chemical adsorption predominates, and the overall adsorption process is influenced by two or more factors. The adsorption isotherm experiment demonstrated that the adsorption mechanism is better described by the Freundlich model, suggesting that mPMF exhibits multi-layer heterogeneous adsorption of CPPU, involving both physical and chemical adsorption mechanisms. Additionally, mPMF showed the potential for cyclic regeneration through desorption after adsorbing CPPU from water, as its adsorption capacity remained largely unaffected even after four consecutive cycles.
研究领域:
环境科学
·
材料科学
·
化学工程
·
环境污染控制
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3670-3686
·
IF 4.5
Zhou F. Y.,Hong B.,Xu J. C.,Han Y. B.,Jin H. X.,Jin D. F.,Zeng Y. X.,Peng X. L.,Ge H. L.,Wang X. Q.
Mesoporous SnO 2 , Sn 0.861 Al 0.186 O 2 , Sn 0.921 In 0.106 O 2 and Sn 0.959 La 0.055 O 2 nanospheres were successfully synthesized by a one-step solvothermal method. The compositions, crystal structures, microstructures, morphology and gas-sensing performance of the as-synthesized Al-, In- and La-doped SnO 2 nanospheres were characterized by XRD, EDS, TEM, SEM, FT-IR, UV–vis and BET. All samples present the similar mesoporous-structural nanospheres due to the same chemical synthesis conditions. The gas-sensing results indicate that the cations-doping greatly affects the formaldehyde gas-sensing performance, and the response increases with the increasing radius of Al, In and La. Owing to the higher specific surface area and larger La 3+ radius, Sn 0.959 La 0.055 O 2 sensor presents the best gas-sensing performance with the response value of 149.59 to formaldehyde gas at 200 °C. It is concluded that metal-cation doping not only causes lattice distortion to increase oxygen vacancies, but also could refine the crystalline grain to improve the specific surface area of metal-cations doped SnO 2 nanospheres.
研究领域:
材料科学
·
无机化学
·
纳米科技
·
传感器技术
·
表面科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 37
·17809-17816
·
IF 3.925
Binyao Liu,Longgang Yan,Jinyu Wen,Xiaotian Liu,Feng Duan,Bi Jia,Xiaoyan Liu,Gaili Ke,Huichao He,Yong Zhou
Relative to the traditional homogeneous Fenton process, the heterogeneous photo-Fenton system has superiorities in terms of the cost, pH range of application, and environmental compatibility for the degradation of organic pollutants. For the development of an effective heterogeneous photo-Fenton system, the most important part is the photocatalyst that can produce H2O2 and further activate it into free radicals (˙OH, ˙O2−). Here, composites of FeOOH and resorcinol–formaldehyde resin (RFS) were prepared by coupling an FeOOH thin layer on the surface of RFS nanospheres, and the resultant composites were investigated as photocatalysts for the construction of a heterogeneous photo-Fenton system. In the FeOOH/RFS composite-based system, H2O2 can be produced via the reduction of dissolved oxygen through RFS nanosphere photocatalysis under visible-light irradiation. Meanwhile, the Fe3+ of FeOOH can be partially reduced to Fe2+ by the photogenerated electrons of the FeOOH/RFS composites. Through the reaction of H2O2 with Fe2+, ˙OH is continuously produced to initiate the effective degradation of rhodamine B (RhB) and dimethyl phthalate (DMP). Our work presents an efficient heterogeneous photo-Fenton system to achieve the degradation of organic pollutants, which could inspire the development of a similar photo-Fenton system for environmental protection.
研究领域:
环境化学
·
材料科学
·
催化化学
·
环境污染与控制
·
光催化
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 38
·21844-21851
·
IF 3.049
Liqiang Yi,Yan Wang,Yini Fang,Ming Zhang,Juming Yao,Lina Wang,Jaromir Marek
It is of great significance to develop phase change materials (PCMs) with high performance. The reported PCMs usually possess serious defects like low heat capacity and poor thermal stability. Here, core–sheath structured nanofibers with polyvinyl butyral (PVB) as the sheath and octadecane as the core were fabricated by melt coaxial electrospinning. Pure octadecane without any solvents was used as the core solution, thus, the optimal sample possessed very high latent heat up to 118 J g−1. We studied the influence of core feed rate and PVB solution concentration on the encapsulation rate, and the highest encapsulation rate was found when the PVB concentration was 10% and core feed rate was 0.08 mL h−1. And hexagonal cesium tungsten bronze (CsxWO3, a near infrared absorber) was introduced into the optimal sample partly to improve its conversion efficiency of solar to thermal energy, and partly absorb uncomfortable infrared light; the composite phase change material also possessed high latent heat up to 96.9 J g−1. In addition, 100 thermal cycle test proved that with a minor latent heat decrease, the prepared core–sheath structured smart nanofibers had good thermal stability, which overcomes the leakage problem of pure octadecane. Additionally, the 9 wt% CsxWO3-loaded sample had an increase in tensile strength and elongation compared with the sample without CsxWO3, indicating the good compatibility between CsxWO3 and PVB.
研究领域:
材料科学
·
纺织工程
·
高分子物理
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jing Guo,Shanhui Zhu,Youliang Cen,Zhangfeng Qin,Jianguo Wang,Weibin Fan
A series of ordered mesoporous Nb x W (8 − x) oxides with tunable Nb/W ratio were successfully synthesized by evaporation-induced self-assembly method. The mesoporous structure, morphologies, surface chemical state, and acidic properties of these catalysts were fully characterized by low-temperature sorption of N 2 , small-angle and wide-angle XRD, TEM, Raman, XPS, and Py-IR. It was shown that the Nb x W (8 − x) oxides created large amounts of Lewis as well as Brønsted acid sites, which promoted the isomerization of glucose to fructose followed its dehydration to 5-hydroxymethylfurfural (HMF). Mannose was also formed via the epimerization of glucose. Of them, the mesoporous Nb 4 W 4 exhibited the best catalytic activity with a comparatively low E a about 90.2 kJ/mol and good stability in aqueous medium. The kinetic behavior revealed that Lewis acid sites facilitated to glucose-to-fructose isomerization while Brønsted acid sites promoted the dehydration of fructose to form HMF.
研究领域:
催化化学
·
生物质转化
·
绿色化学
·
多相催化
·
材料化学
·
碳水化合物化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Kaixuan Wang,Liping Yang,Hexing Li,Fang Zhang
A unique strategy for the direct preparation of primary amine-functionalized ordered mesoporous phenolic resin (NH2-MPRN) was presented. The essence of our approach avoided the side reactions in the m-nitrophenol–formaldehyde resol synthesis using m-nitrophenol and formaldehyde as the monomers. Importantly, these resols can efficiently assemble with triblock copolymer F127 to form a mesostructured composite. The final prolysis treatment removed the F127 template to produce ordered mesopores, and meanwhile, the accompanying reductive gas in situ transferred the nitro groups to primary amines. Notably, the obtained NH2-MPRN material delivered fast toxic hexavalent chromium sorption kinetics with high uptake capacity and selectivity due to a mesoporous structure, high amine availability, and a hydrophobic surface. Interestingly, almost all of adsorbed chromium species existed as low-toxic trivalent chromium in the resin owing to the cooperative detoxification process by the neighboring primary amines and phenolic hydroxyl groups. Also, it showed the reversible detoxification for at least five times.
研究领域:
材料化学
·
环境科学
·
高分子化学
·
纳米材料
·
吸附分离
·
污染治理
·
功能材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Qianqian Lin,Yang Li,Mujie Yang
Polyaniline (PANi) composite nanofibers were deposited on surface acoustic wave (SAW) resonator with a central frequency of 433 MHz to construct humidity sensors. Electrospun nanofibers of poly(methyl methacrylate), poly(vinyl pyrrolidone), poly(ethylene oxide), poly(vinylidene fluoride), poly(vinyl butyral) (PVB) were characterized by scanning electron microscopy, and humidity response of corresponding SAW humidity sensors were investigated. The results indicated that PVB was suitable as a matrix to form nanofibers with PANi by electrospinning (ES). Electrospun PANi/PVB nanofibers exhibited a core–sheath structure as revealed by transmittance electron microscopy. Effects of ES collection time on humidity response of SAW sensor based on PANi/PVB nanofibers were examined at room temperature. The composite nanofiber sensor exhibited very high sensitivity of ∼75 kHz/%RH from 20 to 90%RH, ultrafast response (1 s and 2 s for humidification and desiccation, respectively) and good sensing linearity. Furthermore, the sensor could detect humidity as low as 0.5%RH, suggesting its potentials for low humidity detection. Attempts were done to explain the attractive humidity sensing performance of the sensor by considering conductivity, hydrophilicity, viscoelasticity and morphology of the polymer composite nanofibers.
研究领域:
传感器技术
·
材料科学
·
纳米科技
·
物理化学
·
环境监测
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Mo Qiu,Tianmeng Guo,Ran Xi,Danni Li,Xinhua Qi
In this paper, the as-prepared metal-organic frameworks material UiO-66 and other Zr-MOFs were directly used as catalytic transfer hydrogenation (CTH) catalysts to catalyze furfural (FF) to furfuryl alcohol (FAL) with 2-propanol (IPA) acted as both solvent and hydrogen donor. The results showed that the as-prepared UiO-66 had satisfactory catalytic activity and selectivity in yielding FAL (97 %) from the CTH of FF at 140 °C within 5 h. Moreover, the as-prepared UiO-66 exhibited relatively stable catalytic activity over five cycles and easy regeneration. Interestingly, UiO-66 was also applicable for the CTH of the other aldehydes such as 5-hydroxymethyfurfural, 5-methylfurfural, 4-methoxybenzaldehyde, and n-hexanal to the corresponding alcohols, affording high product yields up to 98 %. This work provides a green, simple and sustainable process for the catalytic production of FAL from biomass-based furfural, which has certain significance for the sustainable utilization of biomass.
研究领域:
催化化学
·
生物质能源
·
绿色化学
·
材料化学
·
有机合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）