MICROPOROUS AND MESOPOROUS MATERIALS
·
2013
·
IF 3.365
Sen Lin,Lei Shi,Hongpeng Zhang,Na Zhang,Xianfeng Yi,Anmin Zheng,Xuebing Li
Al-SBA-15 containing plug structures inside straight channels have been hydrothermally synthesized through a one-step synthesis strategy in an environmentally friendly acid-free medium. The effects of steaming, alkali, and acid post-treatments on the structural properties were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), scanning electron microscopy (SEM), FT-IR spectrum, 27 Al MAS NMR, and inductively coupled plasma (ICP) analyses. The presence of the plugs can significantly enhance structural stability against steaming or alkali post-treatments. Acid post-treatment can be a very simple and convenient technique for adjusting the textural properties of plug-containing Al-SBA-15, and especially for optimizing the accessibility to active sites. Acid post-treatment at the low temperatures of 313 and 323 K results in the formation of a larger specific surface area (905 m 2 /g) and pore volume (0.94 cm 3 /g) through an “open door” effect in the plugs, without eliminating any of the plugs from the channels. In particular, nearly half of the secondary micropores on the pore walls were preserved. In contrast, raising the acid post-treatment temperature further to 333 and 343 K caused a “closed doors” effect through the blockage of pores in the plugs by the extracted fragments. After loading with nickel, the catalyst exhibited a higher yield of C 10+ olefins in ethylene oligomerization , and more importantly, after steaming and acid post-treatments at higher temperatures, the samples showed shape selectivity for the C 16 olefin.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 22
·5239-5247
·
IF 3.431
Xie Lijun,Liu Shuqin,Han Zhubing,Jiang Ruifen,Zhu Fang,Xu Weiqin,Su Chengyong,Ouyang Gangfeng
The fiber coating is the key part of the solid-phase microextraction (SPME) technique, and it determines the sensitivity, selectivity, and repeatability of the analytical method. In this work, amine (NH 2 )-functionalized material of Institute Lavoisier (MIL)-53(Al) nanoparticles were successfully synthesized, characterized, and applied as the SPME fiber coating for efficient sample pretreatment owing to their unique structures and excellent adsorption properties. Under optimized conditions, the NH 2 -MIL-53(Al)-coated fiber showed good precision, low limits of detection (LODs) [0.025–0.83 ng L -1 for synthetic musks (SMs) and 0.051–0.97 ng L -1 for organochlorine pesticides (OCPs)], and good linearity. Experimental results showed that the NH 2 -MIL-53(Al) SPME coating was solvent resistant and thermostable. In addition, the extraction efficiencies of the NH 2 -MIL-53(Al) coating for SMs and OCPs were higher than those of commercially available SPME fiber coatings such as polydimethylsiloxane, polydimethylsiloxane–divinylbenzene, and polyacrylate. The reasons may be that the analytes are adsorbed on NH 2 -MIL-53(Al) primarily through π – π interactions, electron donor–electron acceptor interactions, and hydrogen bonds between the analytes and organic linkers of the material. Direct immersion (DI) SPME–gas chromatography–mass spectrometry methods based on NH 2 -MIL-53(Al) were successfully applied for the analysis of tap and river water samples. The recoveries were 80.3–115% for SMs and 77.4–117% for OCPs. These results indicate that the NH 2 -MIL-53(Al) coating may be a promising alternative to SPME coatings for the enrichment of SMs and OCPs.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhaojie Fang,Zetong Liu,Joe Yeang Cheah,Xinyi Guan,Huijuan Li,Tao Jiang,Shengping Wang,Xinbin Ma
A novel core–shell CaO based adsorbent with Al-Zr co-modification was synthesized via a facile one-pot calcination method. The CO 2 capture capacity and long-term stability of the adsorbents with different Ca/Al/Zr molar ratios were investigated. The co-doping strategy significantly enhanced the CO 2 capture capacity of the calcium-based adsorbents. Specifically, the optimized Ca24Al1Zr0.3 adsorbent exhibited excellent CO 2 adsorption performance in long-term adsorption–desorption cycles, with the CO 2 capacity of 0.53 g-CO 2 /g-ads after 40 cycles. The synergistic effects of Al-Zr co-doping were analyzed from a microstructural perspective. The core–shell Ca24Al1Zr0.3 adsorbent with a CaZrO 3 outer shell featured minimized particle size, abundant mesoporous and macroporous structures, and uniformly distributed doping components. Under the combined effects of structural modification and metal doping, it manifested enhanced CO 2 capture capacity. Based on the CO 2 adsorption mechanism of CaO, this study revealed that Al-Zr co-doping promotes oxygen vacancy generation and improves CO 2 adsorption performance. The Ca24Al1Zr0.3 adsorbent demonstrated the highest oxygen vacancy content and the most pronounced positive shift in Ca 2p binding energy. This shift enhanced electron-donating capability of calcium, effectively facilitating O 2− migration and CO 2 diffusion. Furthermore, the Ca24Al1Zr0.3 adsorbent exhibited superior carbonation reaction kinetics during long-term cyclic operation.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2025
·
IF 5.8
Xiaolong Yan,Yuxuan Deng,Wanming Huang,Qijun Zhang,Li Zheng,Junfeng Zhou,Dongsheng He,Jiayu Ma
This study investigated LDHs-MgAl preparation factors on Gly adsorption performance. The single-factor experiments shown that CO 3 2− -type LDHs-400-MgAl prepared under the condition of calcination temperature of 400 °C, calcination time of 3 h, Mg/Al molar ratio of 2:1, synthesis pH of 10, preparation temperature of 30 °C and aging temperature of 25 °C, had better Gly adsorption performance due to its enhanced crystallinity and hierarchical porosity. Moreover, the Gly adsorption process optimization with LDHs-400-MgAl via the response surface methodology (RSM) was studied. The relative error between the actual value and the predicted value obtained from the RSM model is 0.39 % and the determination coefficient (R 2 ) is 0.9987, which means the Gly adsorption process with LDHs-400-MgAl can be predicted by the proposed RSM model. This work integrates material synthesis optimization with process engineering, offering a scalable strategy for Gly removal in complex wastewater matrices.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Sijia Wang,Ye Liu,Liang He,Yu Sun,Qing Huang,Shoudong Xu,Xiangyun Qiu,Tao Wei
Solid polymer composite electrolytes possess the benefits of superior compatibility with electrodes and good thermal characteristics for more secure energy storage equipment. Herein, a new gel polymer electrolyte (GPE) containing NH 2 -MIL-53(Al), [PP 13 ][TFSI], LiTFSI, and PVDF-HFP was prepared using a simple method of solution casting. The effects of encapsulating different ratios of ionic liquid ([PP 13 ][TFSI]) into the micropores of functionalized metal-organic frameworks (NH 2 -MIL-53(Al)) on the electrochemical properties were compared. XRD, SEM, Nitrogen adsorption-desorption isotherms and electrochemical measurements were conducted. This GPE demonstrates a superior ionic conductivity of 8.08×10 –4 S cm –1 at 60 °C and can sustain a discharge specific capacity of 156.6 mAh g –1 at 0.2 C for over 100 cycles. This work might offer a potential approach to alleviate the solid-solid contact with the solid-state electrolyte and electrodes, and broadens up new window for the creation of all-solid-state batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Bihong Li,Ming Wen,Yijie Ding,Weizhong Zheng,Weizhen Sun,Ling Zhao
The acidity and pore structure of zeolite catalysts play a crucial role in the selectivity and stability of C4 alkylation due to the synergistic effect of reaction activity and diffusion. Herein, the effect of three acidic beta zeolites with different Si/Al ratios on adsorption, diffusion, and catalytic performance was studied using experiments and molecular simulations. The beta zeolite with the lower Si/Al ratio leads to the faster relative diffusion of isobutane to 1-butene and the smaller adsorption amount of alkylate products. Furthermore, the diffusion of molecules in the zigzag channel along the z direction of beta zeolites is much slower than other two directions. The experimental results indicate that lower Si/Al ratio cause the higher content of strong BAS in the zeolite, resulting in the higher hydride activity and the longer catalytic lifetime. This work provides a theoretical basis for the development of high catalytic activity zeolite catalysts.
研究领域:
化学工程
·
催化
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材料科学
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分子模拟
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·301-310
·
IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
研究领域:
环境化学
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催化材料
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废水处理
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无机非金属材料
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表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jiehua Bao,Yuming Zhou,Yiwei Zhang,Yanyun Wang,Shuang Liang,Zhiwu Guo,Chang Guo,Yi Xue,Tao Zhuang,Yingjie Hu
In this study, we synthesized a series of Ni-based catalysts with different CeO 2 contents (0, 1, 2, 5 and 10 wt%) anchoring on the Al-Mg oxide spheres (AMO) with three-dimensional hollow flower-like structure. The triethoxyoctylsilane (TEOOS) and polyvinylpyrrolidone (PVP) were selected as effective modified reagents to introduce hydrophobic functionality on the surface of AMO and Ni-CeO 2 nanoparticles, respectively, for controllable anchoring Ni-CeO 2 nanoparticles on AMO by hydrophobic interaction driving mechanism. The effects of CeO 2 content on the texture, dispersion of Ni species, the reducibility of Ni 2+ , surface electronic states and acidity were investigated in detail. The Ni-5CeO 2 /AMO was found to achieve the highest 2,2′-bipyridine selectivity of 90.6% and maximum turnover number (TON) of 8611, specifically. Moreover, the Ni-5CeO 2 /AMO exhibits superior stability, maintaining 89% of 2,2′-bipyridine yield after 6 runs, due to the mitigated nickel leaching and promotion of the desorption of 2,2′-bipyridine. Furthermore, with the help of DFT calculations, a possible reaction mechanism was discussed and illustrated.
研究领域:
催化化学
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材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2020
·Vol. 29
·期 11
·7239-7249
·
IF 1.652
Sang Changcheng,Cai Xiaoping,Zhu Lu,Ren Xuanru,Niu Gao,Wang Xiaohong,Feng Peizhong
To achieve the low energy consumption and high strength joining between Ti and Ni, a novel joining method (rapid thermal explosion, TE) was developed for joining dissimilar metals using Ti-Al mixture powders as flux. The TE reaction temperature of Ti-Al flux was measured, and the microstructure and mechanical properties of Ti/Ni joint were investigated. The results reveal that the combustion temperature of the Ti-Al powder interlayer is 1103 °C, which is higher than the joining temperature, and an obvious self-exothermic phenomenon lasts 20 s. The intermetallic compound diffusion layers formed at both interfaces mainly owing to the diffusion of Al and the growth activation energy of diffusion layers near both interfaces are 79.68 kJ/mol and 38.26 kJ/mol, respectively. Based on the sheer strength and diffusion layer, the formation mechanism of Ti/Ni joints is metallurgical bonding through atomic diffusion and formation of the diffusion layer.
研究领域:
材料科学
·
焊接工程
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金属间化合物
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界面化学
·
固态连接
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Tianqi Yuan,Miao Chen,Xiaotong Sun,Jianping Guan,Fawei Zhu,Kai Tang,Zhipeng Zhang,Qi Liu,Xiaoqing Chen
Designing chiral adsorption separation material with high enantioselectivity and stability is a promising route to realize the enantioselective recognition and separation of racemic molecules. Here, for the first time, camphor sulfonic acid derivatives (CSA) were synthesized as a chiral resolving agent, and it was modified on Mg/Al layered double hydroxide (Mg/Al-LDH) through electrostatic self-assembly to construct functionalized chiral adsorption separation material (CSA@LDH), which could be served as an adsorbent for enantioselective recognition and separation of propranolol enantiomers ( R,S -PRO). The CSA@LDH maintained the advantage of limited chiral space in layered structures to achieve the selective enrichment of R -PRO, and the e.e. % value of single separation could reach 19.5%. Meanwhile, density functional theory (DFT) calculations supported that chiral recognition and separation were ascribed to the discrepancy in affinities stemming from the difference of π-π interaction force and hydrogen bonding capacity of CSA with R,S -PRO. Hence, considering the superior ability of hydrogen bond coordination and stereocontrol of camphor sulfonic acid derivatives, it is expected to be more widely used as a chiral resolving agent for other enantiomeric recognition and separation.
研究领域:
化学
·
材料科学
·
药物化学
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 14
·期 3
·2303063
·
IF 27.8
Junhua Zhou,Chi Zhang,Chuan Xie,Huimin Wang,Haining Fan,Yanpeng Guo,Chao Wang,Fan Chen,Yichun Ding,Qiyao Huang,Zijian Zheng
Lithium–sulfur battery (LSB) possesses high theoretical energy density, but its poor cycling stability and safety issues significantly restrict progress in practical applications. Herein, a low-cost and simple Al(OH) 3 -based modification of commercial separator, which renders the battery outstanding fire-retardant and stable cycling, is reported. The modification is carried out by a simple blade coating of an ultrathin composite layer, mainly consisting of Al(OH) 3 nanoparticles and conductive carbon, on the cathode side of the separator. The Al(OH) 3 shows strong chemical absorption ability toward Lewis-based polysulfides and outstanding fire retardance through a self-decomposition mechanism under high heat, while the conductive carbon material acts as a top current collector to prevent dead polysulfide. LSB using the Al(OH) 3 -modified separator shows an extremely low average capacity decade per cycle during 1000 cycles at 2 C (0.029%, 1 C = 1600 mA g −1 ). The pouch cell exhibiting high energy density (426 Wh kg −1 ) can also steadily cycle for more than 100 cycles with high capacity retention (70.2% at 0.1 C). The effectiveness and accessibility of this Al(OH) 3 modification strategy will hasten the practical application progress of LSBs.
研究领域:
电化学储能
·
材料科学
·
能源化学
·
电池技术
·
纳米材料应用
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Nana Zhu,Lu Zhu,Baojing Zhang,Peizhong Feng,Shiheng Li,Philipp V. Kiryukhantsev-Korneev,Evgeny A. Levashov,Xuanru Ren,Xiaohong Wang
An innovative two-step approach of self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS) was developed to rapidly fabricate MoSi 2 and Mo(Al,Si) 2 ceramics for high-temperature anti-oxidation applications. The SHS process predominantly promoted the synthesis of high-purity and high-yield MoSi 2 and Mo(Si,Al) 2 phases in the alloyed powders. Subsequently, dense and crack-free MoSi 2 and Mo(Al,Si) 2 ceramics were produced using SPS. 1500 °C oxidation tests of the ceramics (100 h) revealed the formation of a protective SiO 2 oxide layer on the surface of MoSi 2 ceramics, while an Al-Si-O composite glassy oxide layer formed on Mo(Si,Al) 2 ceramics, which exhibited better thermal stability and lower oxygen permeability compared to the single SiO 2 oxide layer. However, an excessive Al content (>0.05 at.%) compromised the oxidation resistance due to the emergence of a Si-depleted Mo 5 (Si,Al) 3 layer with inferior oxidation resistance, which was caused by the high-temperature diffusion of Si. Therefore, via this novel two-step SHS-SPS technique compact and crack-free Mo(Si,Al) 2 ceramics can be rapidly synthesized at high temperatures. When trace amount of Al was added (0.05 at.%), Mo(Si 0.95 Al 0.05 ) 2 showed optimum high-temperature oxidation resistance.
研究领域:
材料科学
·
高温结构材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）