JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 31
·期 1
·1-9
·
IF 2.8
Wu Hai-Bo,Zhou Xian-Tai,Zhou Xiao-Wu,Fang Yan-Xiong
As a biodegradable polyester, the commercialized synthesis protocol of poly(ε-caprolactone) (PCL) under mild conditions is of great significance and attractive. Herein, the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) using FeCl 3 catalyst and benzyl alcohol (BnOH) as the initiator was developed. FeCl 3 has been proved to be an efficient catalyst for the ROP of ε-CL under mild conditions. The conversion of ε-CL to PCL was 98.8% at 60 °C within 4 h, with number-average molecular weight ( M n) and dispersity (PDI) of 1.65 × 10 4 g/mol and 1.28, respectively. Moreover, a coordination-insertion ring-opening polymerization mechanism mediated by FeCl 3 was proposed. Overall, this work is expected to provide a feasible industrial method for the preparation of PCL from the direct aerobic oxidation of cyclohexanone.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Chao Wang,Qilin Zhang,Yanglei Chen,Xueming Zhang,Feng Xu
The economically viable synthesis of levulinic acid (LA), a promising and valuable renewable biomass-derived platform for bioproducts, with high carbon efficiency is a challenge. A direct and highly effective catalytic system for conversion of xylose residues (XRs) into LA under mild conditions by using FeCl3 as catalyst and cheaply available NaCl as promoter has been developed. The NaCl solution exhibits high carbon efficiency in LA (68.0 mol %) when compared with the non-NaCl systems (48.5 mol %) due to the moderate increase of the acidity and the higher viscosity of the NaCl system than water. The experimental results demonstrated that the presence of NaCl caused no distinctive changes on reaction pathways but increased the dissolution rate and the hydrolysis rate of XRs cellulose. Moreover, further integration of our degradation process with a reactive extraction step makes energy-efficient separation of LA. The NaCl solutions easily and efficiently extracted LA into LA-derived solvent 2-methyltetrahydrofuran from aqueous solutions. The efficiency and integration of the reaction process presented a great potential for LA production from renewable biomass with the aid of concentrated seawater.
研究领域:
生物质化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 32
·12785-12791
·
IF 0
Shengyang Tao,Yuchao Wang,Da Shi,Yonglin An,Jieshan Qiu,Yishan Zhao,Yan Cao,Xuefang Zhang
An efficient strategy is developed for producing hierarchically porous graphite (HPG) monoliths with a bimodal pore structure through a confined graphitizing process with FeCl3 as the catalyst. The microspace in a silica microreactor is used for molding and protecting the carbon structure without collapse during crystallization. Especially, the confined graphitization approach is favorable for forming highly crystallized graphite materials with large specific surface at low preparation temperature. It balances the benefits of a porous structure and degree of crystallization. Due to the outstanding physical and chemical properties, the graphitized porous carbon exhibits excellent electrochemical performances. HPG shows high sensitivity for use as sensing electrodes. Additionally, HPG also exhibits remarkable stabilization on capacitance at large current densities as a supercapacitor. There is hardly any loss in specific capacitance even with a charge current of 30 to 50 A g−1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
RENEWABLE ENERGY
·
2024
·
IF 9
Yanbing Li,Jiayue Ma,Rui Pan,Ting Wang
The efficient use of wood powder has become increasingly important for protecting the environment and addressing energy shortages. In this study, a proton exchange membrane electrolysis system was utilized to convert biomass into valuable industrial chemicals and hydrogen using ferric ions as redox mediators , reduced reaction costs. GC-MC analysis revealed that the degradation products are mainly consisted of aromatic carbonyl compounds , along with some alcohols, phenols , and alkanes. The degradation efficiency was found to be 55.6 %, and the Faraday’s hydrogen production efficiency exceeds 92.6 %. Moreover, Fe 3+ /Fe 2+ redox mediators was recycled in the electrolysis system, maintaining high reactivity. This research introduces a new approach for the degradation of wood powder, offering potential for sustainable industrial production and a reduction in environmental impact.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuan Wang,Ting Xu,Han Zhang,Junjie Qi,Yaxuan Wang,Meng Zhang,Wei Liu,Zhanhui Yuan,Chuanling Si
The cellulose nanofibrils (CNFs)/MXene composite film has been widely studied in the field of energy storage, sensing, etc. The carboxyl group in CNFs can form hydrogen bond interaction with −F, −O and –OH in MXene to preventing the self-stacking of MXene. In addition, for energy storage, carboxyl groups also promote ion transport in the electrolyte, improving electrochemical performance. Therefore, the green preparation for carboxylic CNFs is important. Herein, CNFs with high carboxyl content were prepared by introducing ferric chloride (FeCl 3 ) catalyst to promote the hydrolysis efficiency of bleached softwood kraft pulp (BSKP) by maleic acid (MA). It was found that the optimized CNFs demonstrated a narrow diameter distribution, high yield (90 %), high carboxyl content (0.5 mmol/g), and good thermal stability (T max was about 343 °C). In addition, the obtained CNFs were further combined with MXene by filtration to obtain a composite film, and the composite film was used for self-supporting electrodes. XRD showed increased layer spacing of MXene in composite film, indicating that CNFs effectively inhibited MXene self-stacking. CNFs/MXene film as the self-supporting electrode showed good electrochemical performance (areal capacitance of 2051.4 mF cm −2 at 2 mA cm −2 ) in three-electrode system.
研究领域:
材料科学
·
能源存储
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）