JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Yingqing Zhao,Rui Liu,Christian Marcus Pedersen,Zhenzhou Zhang,Zhaohui Guo,Honghong Chang,Yingxiong Wang,Yan Qiao
Lactic acid (2-hydroxypropionic acid, LA) can be produced from abundant and renewable biomass resources via chemocatalytic processes, which exhibited high potential for meeting its tremendous demand in a wide range of applications. The basic Ba(OH) 2 could efficiently catalyze the conversion of d -glucose into LA. In the present study, by utilizing various NMR techniques including, chemical shift titration, 2D diffusion ordered spectroscopy (DOSY) analysis, heteronuclear singular quantum correlation ( 1 H– 13 C HSQC), the binding sites and catalytic interaction between d -glucose and catalyst were clarified. The experimental results by NMR and electrospray ionization mass spectrometry (ESI–MS) were used to explore the reaction mechanism. Experimental results disclosed that the catalyst, Ba(OH) 2 , may exist in the form of [Ba(OH)(H 2 O) 2 ] + under the reaction condition. The OH – of [Ba(OH)(H 2 O) 2 ] + is attached to the C5-O of d -glucose, and Ba 2+ is connected to the C1-O of d -glucose. Herein, we suppose that Ba(OH) 2 and d -glucose interact and form a complex, d -glucopyranose-[Ba(OH)(D 2 O) 2 ] + . Furthermore, when the reaction was performed in D 2 O, we were surprised to find that LA underwent varying degrees of deuteration. The reaction mechanism, binding sites and deuteration of the product have shed light on the efficient conversion of biomass to LA.
研究领域:
生物化学
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催化化学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
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IF 5.018
Qiangqiang Xiao,Wenhui Yuan,Li Li,Tao Xu
Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH) 2 ·8H 2 O/MEG composite PCM was synthesized by incorporating Ba(OH) 2 ·8H 2 O into MEG matrix. Mass fractions of Ba(OH) 2 ·8H 2 O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH) 2 ·8H 2 O. The phase separation of Ba(OH) 2 ·8H 2 O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH) 2 ·8H 2 O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH) 2 ·8H 2 O. The latent heat was approximately equal to the product of the latent heat of Ba(OH) 2 ·8H 2 O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Molecular Catalysis
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2021
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IF 5.062
Zijing Wang,Changjuan Mo,Sixuan Xu,Shanshuai Chen,Tiansheng Deng,Wanbin Zhu,Hongliang Wang
The catalytic conversion of carbohydrate to platform chemicals, e.g. lactic acid (LA), is the key to unlock the potential of biomass. In this study, we report that the combination of Ba(OH) 2 and Ca(OH) 2 can efficiently catalyse high-concentration (> 0.5 M) of glucose to relatively high yield of LA (> 40 %) under mild conditions (60 °C). Both glucose conversion and LA yield were sensitive to the pH of the catalytic system. A high loading of Ba(OH) 2 led to a high initial pH of the reaction solution, resulting in serious side reactions. While, a low loading of Ba(OH) 2 led to a quike decrease of OH − and Ba 2+ both of which were continuously consumpted by the formed LA. The combination of Ca(OH) 2 with Ba(OH) 2 could significantly improve LA yield, since Ca(OH) 2 , with limited solubility, could act as a controlled-release catalyst for the real-time supply of OH − and Ca 2+ . OH − was indispensable for glucose isomerization to fructose as well as for fructose retro-aldol reaction to C 3 intermediates. Ca 2+ could combine with LA to form stable calcium lactate, liberating Ba 2+ to catalyse the conversion of C 3 intermediates to LA. Under the preliminary optimized reaction conditions, the yield of LA could be reached to 42.55 % and 38.32 % from 0.5 M and 1 M glucose, respectively. This catalytic system has advantages of mild reaction condition, short reaction time, and capable of conversion of high-concentration substrates, enabling it with a great potential for practical applications.
研究领域:
生物化学
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可再生资源化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 20
·1-13
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IF 2.8
Xie Linqiang,Ding Jiangtao,Liu Han,Lu Di,Yu Wanchun,Hu Te,Lin Jiayang,Cheng Zhenzhi,Gao Fei,Luo Guangsheng,Zhou Weiping
Soft magnetic composites with enhanced permeability and reduced power loss are urgently needed in the next generation of power electronics and electrical machines. However, traditional insulation techniques suffer from the uneven coating or complex process, which cannot meet these requirements. Here, the feasibility of Ba(OH) 2 as a coating layer of soft magnetic powder is explored. Due to its low melting point, Ba(OH) 2 exhibits good flowability in the molten state, enabling it to evenly coat FeSiAl particles and fill interparticle gaps, thereby forming a uniform, dense insulating layer. This novel coating strategy improves the formability of the magnetic powder cores and optimizes the cores’ soft magnetic performance. Compared with SMPCs without Ba(OH) 2 coating, FeSiAl@Ba(OH) 2 SMPCs have higher magnetic permeability (μ e = 59.5), higher quality factor ( Q max = 127.3), lower high-frequency power loss ( P cv = 2062.9 mW/cm 3 @1 MHz and 50 mT), and good DC bias performance. Our results provide a new approach for the design of insulation coatings for SMPCs, demonstrating significant application potential for high-frequency electronic devices.
研究领域:
材料科学
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电气工程
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应用物理学
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纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）