Journal of Energy Chemistry
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2016
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IF 2.322
Ran An,Guizhuan Xu,Chun Chang,Jing Bai,Shuqi Fang
Butyl levulinate (BL) is a promising new candidate as diesel fuel and fuel additive. In this study, an efficient process for a one-pot synthesis of BL from biomass-derived carbohydrates in butanol medium with the catalysis of metal sulfates was developed. The catalytic activity of a series of metal sulfates for the synthesis of BL from fructose was investigated. Among various metal sulfates, ferric sulfate Fe 2 (SO 4 ) 3 was found to be the most efficient catalyst, which gave a remarkably high BL yield of 62.8 mol% under the conditions of 463 K, 3 h, a catalyst dosage of 5.0 g/L, and fructose concentration of 25 g/L. Different carbohydrates including glucose, cellulose , inulin and sucrose were also used for one-pot synthesis of BL with the catalysis of Fe 2 (SO 4 ) 3 , showing the yields of 39.6, 30.5, 56.6 and 50.1 mol%, respectively. In addition, the recycling and reuse of Fe 2 (SO 4 ) 3 was studied by characterizing them using powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS). A plausible reaction pathway for the one-pot synthesis of BL from fructose was proposed. This study provides a facile and feasible way for the synthesis of BL from biomass.
研究领域:
生物化学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Chongyang Yuan,Wei Chen,Zunxian Yang,Zhenguo Huang,Xuebin Yu
MgH 2 is regarded as a potential hydrolysis material for the hydrogen generation due to its high theoretical hydrogen yield, abundant source on earth and environmentally friendly hydrolysates. However, the quickly formed passive magnesium hydroxide layer on the surface of MgH 2 will hinder its further hydrolysis reaction, leading to sluggish reaction kinetics and low H 2 yield. In this paper, we explore the improvement of different anions and cations in solutions for the hydrolysis of MgH 2 . It is found that the cations in the solution promote the reaction rate of MgH 2 hydrolysis through the hydrolysate-induced growth effect, among which the fastest hydrogen yield can get 1664 mL/g within a few minutes in the Fe 2 (SO 4 ) 3 solution. As for the anions, it enables different microstructures of the Mg(OH) 2 hydrolysate which give rise to enhanced water utilization. Specially, for the mixed 0.5 M MgCl 2 + 0.05 M MgSO 4 solution, the water utilization rate attains the optimum value of 51.3 %, much higher than that of the single MgCl 2 or MgSO 4 solutions. These findings are of great significance for the application of MgH 2 hydrolysis as hydrogen generation.
研究领域:
材料科学
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化学工程
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氢能
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yan Yi,Xiangyu Wang,Yaxian Zhang,Jun Ma,Ping Ning
The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe 2 (SO 4 ) 3 (Fe 2 (SO 4 ) 3 @EN-BC) for Cr(VI) removal. The characterizations of Fe 2 (SO 4 ) 3 @EN-BC confirmed that Fe 2 (SO 4 ) 3 was attached to biochar in form of Fe 2 O 3 after hydrolysis and calcination under high temperature. The results showed that Fe 2 (SO 4 ) 3 @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model , indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe 2 (SO 4 ) 3 @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe 2 (SO 4 ) 3 @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1% and 80.9%, respectively.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2016
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IF 3.847
Xinping Ouyang,Tao Ruan,Xueqing Qiu
Lignin was hydrothermal oxidation depolymerized by using H 2 O 2 as the oxidant and CuO/Fe 2 (SO 4 ) 3 /NaOH as catalysts. The effect of the solvents, including water, methanol, 1,4-dioxane, tetrahydrofuran , ethanol, and their co-solvent, on the depolymerization of lignin were investigated. It is found that the yield of monophenolic compounds reaches 17.92% by using 1:1 (v/v) of methanol/water as the reaction medium. The suitable proportion of methanol to water not only effectively maintains the alkalinity of the reaction medium and the solubility of lignin, but also suppresses the demethoxylation during the process of depolymerization reaction, resulting in an increase of contents of syringyl style monophenolic compounds which prevents the re-polymerization. Consequently, the yield of monophenolic compounds is increased.
研究领域:
化学工程
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有机化学
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可再生能源
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Jiaqi He,Jianlin Sun,Yanan Meng,Huajie Tang,Ping Wu
Nanofluids containing nanocomposite materials have broad application prospect in lubrication . In the present study, MoS 2 -Al 2 O 3 nanocomposite was synthesized by solvothermal method . Then water-based nanofluid containing MoS 2 -Al 2 O 3 nanoparticles was prepared and it exhibited optimal stability and wettability . The tribological properties of MoS 2 -Al 2 O 3 nanofluid under steel/steel contact were investigated. Through chemical analysis of worn surface, tribochemical reactions occurred and tribofilm generated at friction interface were studied to reveal the lubrication mechanism. The results showed that MoS 2 -Al 2 O 3 nanofluid exhibited outstanding effect on reducing the friction force and wear rate of friction pairs. The superior lubrication performance was partly attributed to the entry and movement of nanoparticles at friction interface. More importantly, due to interfacial tribochemistry , a tribofilm with double layer structure composed of adsorption film and reaction layer was formed on the metal surface , preventing the direct contact of steel surfaces. The adsorption film with a thickness of about 16 nm was predominated by amorphous substrates and crystal phases (ultrafine Al 2 O 3 and MoS 2 debris) embedded in the top. And the reaction layer beneath adsorption film contained high mechanical properties iron oxides (mainly Fe 3 O 4 and Fe 2 O 3 ) and self-lubricating Fe 2 (SO 4 ) 3 , which further alleviated friction and enhanced the wear-resistance of materials.
研究领域:
材料科学
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摩擦学
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化学工程
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机械工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）