APPLIED CATALYSIS A-GENERAL
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2019
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IF 4.63
Meng Xia,Zheng Shen,Shaoze Xiao,Bo-yu Peng,Minyan Gu,Wenjie Dong,Yalei Zhang
The direct catalytic transformation of raw lignocellulosic biomass into valuable chemicals is of great significance for sustainable production. This work reports the combination of a transition metal chromium with tin in Beta zeolites to efficiently catalyse the conversion of Miscanthus into lactic acid with a yield of 33.4% and a selectivity of 53.2%. On the basis of experiment and kinetic studies , chromium and tin were beneficial for the retro-aldol condensation and isomerization of carbohydrates, respectively. The acidity of the catalyst was investigated based on important insight into the synergetic catalytic mechanism. The strong Lewis acidity possessed by the transition metals was remarkably advantageous for catalysing the retro-aldol fragmentation reaction, while the relatively weak Lewis acidity of the tin species was considered a dominant factor in the isomerization reaction. The coupling of multifunctional active sites provided a new director for the transformation towards lactic acid formation.
研究领域:
催化化学
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可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
Greenhouse Gases-Science and Technology
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2021
·Vol. 11
·期 6
·1191-1197
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IF 2.013
Subrato Acharjya,Jiacheng Chen,Minghui Zhu,Chong Peng
Immobilized tin phthalocyanine dichloride (SnPcCl 2 ) was prepared by refluxing SnPcCl 2 and hydroxyl-functionalized carbon nanotubes in DMF with the addition of triethylamine, which exhibited minimal aggregation and approximately 2–3 folds improvement in activity towards CO 2 electroreduction compared to the physically mixed SnPcCl 2 /CNT hybrid. Cyclic voltammetry analysis and in situ UV-vis spectra revealed that metallic tin is the active site for CO 2 electroreduction, and the redox behavior of Sn 0 is affected by the adjacent demetallized macrocycles. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
材料科学
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电化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Cui Yumeng,Wu Weihong,Meng Chunhui,Wu Pengxin,Jiao Yunhong,Qu Hongqiang
Polyester/cotton (T/C) blend fabrics are highly flammable due to the particular “scaffolding effect,” which limits its application scope. In this work, a polyacrylic acid (PAA) flame-retardant coating was prepared by combining a conventional intumescent flame retardants (IFRs) with a hybrid of graphene and metallic tin (GnPSn) prepared by mechanical forces. The flame retardants were deposited onto the T/C blend fabric by surface coating method, and its flame-retardant and thermal properties were studied. The combined characterization of scanning electron microscopy (SEM) and mapping proved that the coating system had been successfully processed to the surface of T/C blend fabrics. The results of limiting oxygen index (LOI) showed that PER-1/GnPSn-4 polyester/cotton blends obtained good flame-retardant properties with LOI of 25.0%. The thermal stability and combustion behavior of the blends before and after impregnation were evaluated by thermogravimetric (TG) and cone calorimetry test (CCT), and the peak heat release rate of PER-1/GnPSn-4 polyester/cotton blends was 51.2% lower than that of Pure Emulsion T/C blend fabrics, with an increase in residual carbon by 16.39%, which indicated that the addition of GnPSn altered the thermal degradation process and suppressed the combustion of the T/C blend fabrics, heat and smoke release during the combustion process. In addition, the results of thermogravimetric-Fourier transform infrared (TG-IR) spectroscopy of the samples showed that the intumescent composite coatings were flame retardant to T/C blended fabrics in both condensed phase and gas phase.
研究领域:
材料科学
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纺织工程
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燃烧与防火
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产品关联
DOI
高影响因子
Fundamental Research
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2024
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IF 5.7
Na Chu,Xiaobing Wu,Ziyue Zhao,Xue Zheng,Yilin Lu,Ying Pu,Yue Wang,Jiayi Cai,Lixia Zhang,Xiaohong He,Daping Li,Raymond Jianxiong Zeng,Yangyang Yu,Yong Jiang
The demand for converting CO 2 into fuels or chemicals is on the rise to achieve a carbon-efficient circular economy. Biohybrid CO 2 electrolysis shows potential for increasing production rates and diversifying product spectra by combining electrocatalysts and microbial catalysts. However, it is important to note that utilizing a shared catholyte for biohybrid CO 2 electrolysis has not demonstrated significant performance improvements to date. In this study, we developed a biohybrid CO 2 electrolysis system utilizing a solid electrolyte operating in an external mode. The produced formic acid was extracted and used as an intermediate for microbial conversion. Impressively, the solid-electrolyte CO 2 electrolysers obtained a remarkable total Faraday efficiency of 81.4% for formic acid production. In-situ mechanism studies unveiled metallic tin as the probable real active site, prompting further exploration of strategies to boost the activity and stability of electrocatalysts. In the bioconversion step, we achieved a noteworthy 8-day duration for generating bioelectricity, nearly 100% electron recovery for biomethane production, and 90.8% for acetate generation. Additionally, when ethanol was co-fed, a C 6 specificity of 41.1% was observed for the generation of medium-chain fatty acids (MCFAs). This study presents groundbreaking experimental data that demonstrates the numerous advantages of utilizing hybrid systems as advanced synthesis techniques.
研究领域:
电化学
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生物技术
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环境科学
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材料科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
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2018
·Vol. 5
·期 11
·2756-2762
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IF 5.106
Yi Zhang,Limin Zhou,Fangyu Xiong,Han Tang,Qinyou An,Liqiang Mai
Traditional tin (Sn)-based oxide materials suffer from huge volume expansion/contraction during discharge/charge cycling, resulting in poor cyclic stability when they are used as anode materials. In comparison, the bimetal Sn-based oxides have gained increasing attention in the field of rechargeable sodium ion batteries (SIBs) because of the synergism between the metal components, which prevents agglomeration of the active particles. In this work, the electrochemical performances of copper tin oxide (CuSnO3) as an anode material for SIBs were investigated for the first time. The amorphous CuSnO3 nanospheres anchored on interconnected carbon networks were easily prepared by mixing copper tin hydroxide [CuSn(OH)6] with graphene oxide and carbon nanotubes to form a composite, followed by a freeze-drying treatment and calcination. The intrinsic structure and carbon networks of the composite effectively buffer the enormous volume variation and enhance the conductivity of the active particles during discharge/charge cycles, contributing to the good cycling stability (310.8 mA h g−1 at 100 mA g−1 after 55 cycles). This work also reveals the enhancement in conductivity caused by the metallic copper generated during cycling and the effect of carbon networks, proving the bimetal oxides to be promising anode materials for SIBS.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）