BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Yihan Li,Xiheng Kang,Zi You,Tieguang He,Tianming Su,Junhua Zhang,Xinshu Zhuang,Zhanying Zhang,Arthur J. Ragauskas,Xueping Song,Kai Li
Sugarcane bagasse (SCB) has a recalcitrant structure, which hinders its component dismantling and subsequent high value utilization. Some organic solvents are favorable to dismantle lignocellulose, but their high viscosity prevents separation of components and reuse of solvents. Herein, ethylene glycol phenyl ether (EGPE)-acid system is used as an example to develop green and efficient methods to dismantle SCB, purify polysaccharides and lignin, and reuse solvents. Results show that dismantling SCB at 130 °C, 0.5 % H 2 SO 4 , and 100 min can obtain 85.5 % cellulose recovery, 94.1 % hemicellulose removal and 83.7 % lignin removal. Different molecular weight saccharides are separated by membranes filtration and centrifugation, and lignin recovered by antisolvent precipitation. The solvent recovered by distillation, achieving high dismantling efficiency of 89.2 % cellulose recovery, 94.1 % hemicellulose removal and 94.4 % lignin removal after four recycles. Results show a promising approach for the closed-loop process of dismantling lignocellulose, fractionating saccharides, and reusing solvents in high-viscosity systems.
研究领域:
生物工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 55
·43972-43977
·
IF 3.84
Jun Hu,Dekui Shen,Shiliang Wu,Huiyan Zhang,Rui Xiao
The microwave-assisted cleavage of C–O linkages in benzyl phenyl ether was investigated at 200 °C in the presence of ZrP or SBA-15 doped with or without metal catalyst (Pd/C or Ru/C). The total yield of phenol and benzyl alcohol from benzyl phenyl ether depolymerization with ZrP was 26.91%, while the yield of phenol reached 26.11% for that with Pd/C. Hybrid catalysts performed effectively for promoting the formation of phenol. A conversion of 85.70% was achieved with ZrP–Pd/C catalyst, and the selectivity to phenol reached 47.32%. The highest yield of phenol was obtained at 1 h, and repolymerization was remarkable at longer reaction time. Based on the reaction using phenol and benzyl alcohol as the reactants, benzyl phenyl ether might be decomposed into phenol and benzyl alcohol following with the repolymerization producing thermally stable polymers in the presence of Pd.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2025
·
IF 4.1
Zilan Jiang,Sibin Zhu,Xufeng Tang,Haibo Tang,Xiaoming Zhu,Lun Yu,Letian Li,Yadong Wang,Haolin Tang,Xiaoling Liu
Owing to their high theoretical energy density and carbon-free operation, Direct Ammonia Fuel Cells (DAFCs) have recently garnered substantial interest in the research community. However, the sluggish kinetics of the Ammonia Oxidation Reaction (AOR) significantly limit the practical applications of DAFCs. The ternary alloy catalyst PtIrZn has become a research focus due to its excellent electrocatalytic performance. However, designing PtIrZn nanocubes with high (100)-facet exposure to maximize AOR performance remains a major challenge. In this study, high (100)-facet-exposed PtIrZn nanocubes were successfully synthesized using a hydrothermal method, employing oleylamine as a reducing agent and dibenzyl ether as a morphology-directing agent. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterization confirmed their cubic structure and high proportion of (100) facets. Electrochemical testing indicated that PtIrZn nanocubes exhibited a significant current density (163.94 A g-1PtIr) in AOR, outperforming previously reported PtIrZn catalysts. Density Functional Theory (DFT) calculations further revealed that the (100) facets in the as-designed PtIrZn possess a lower reaction energy barrier and a more negative d-band center compared to the (111) facets. This leads to an enhanced dehydrogenation capacity of NH₃ and consequently accelerates the rate of AOR.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Shasha Liu,Yuhui Wang,Juan Wang,Jianbin Zhou,Xun Hu,Hongqi Sun,Muhammad Asif Akhtar,Hong Zhang,Yong Huang,Shu Zhang
Char-supported metals as catalysts has attracted much attention due to the renewability and structural controllability of char. To understand the effect of char physicochemical structures on the activities of itself and it-supported metal, decomposition of a α−O−4 lignin model compound (benzyl phenyl ether, BPE) over various char-supported Ni catalysts was studied at 400 °C, in which the char supports were prepared at 400 °C, 600 °C, and 1000 °C, respectively. The results showed that the conversion of BPE over the original chars decreased from 17.63% to 7.79% when the preparation temperature of char increased from 400 °C to 1000 °C, while an opposite trend was found for the char-supported Ni, particularly full conversion of BPE was realized when char prepared at 1000 °C was used as the carrier. In addition to the catalysis of Ni, the introduction of Ni improved the graphitization degree and specific surface area of the char support, thus promoting the breakage of C α −O in BPE to mainly generate phenol and toluene. The synergistic effect of char support and Ni on BPE decomposition was demonstrated.
研究领域:
化学工程
·
可再生材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Wang Li,Wen-Ying Li,Xing-Bao Wang,Jie Feng
During direct coal liquefaction , selective C al –O bond cleavage is critical for phenol production. In this study, anisole and benzyl phenyl ether were chosen as the oxygen-containing model compounds. Radical-induced sites of benzyl phenyl ether were investigated using the Fukui function and energy barrier calculation. The promotion routes of the C al –O bond cleavage in anisole and benzyl phenyl ether by radicals were illustrated. The formation of o -benzyl phenol was regarded as a sign of benzyl radical-induced pyrolysis based on the most optimal path. The competitive process between the optimal path and β-bond scission path was analyzed from the rate constant perspective. Radical-induced pyrolysis made remarkable differences in product selectivity for benzyl phenyl ether. Similarly, the cleavage of the C al –C al bond can also be promoted using two methods of radical induction, which is referred to as a radical chain process. In contrast to benzyl phenyl ethers, the induced pyrolysis of the C al –C al bond in bibenzyl is more likely to occur via β-bond scission after the H of CH 2 is abstracted by a radical. The findings of this research would provide a theoretical foundation for comprehending the radical mechanism of direct coal liquefaction.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Hongxi Zhang,Zhongke Li,Shuyu Tang,Xiande Yang,Meng li,Jing Yang,Liang Wei
This study examines the use of tetrabutylammonium tetrafluoroborate (TBABF 4 ) as a catalyst for the depolymerization of lignin and its model compound without the addition of oxidants. The impact of electrolytes, reaction times, and solvents on the cleavage of the α-O-4 bond in lignin is investigated. The experimental setup includes specific conditions such as the use of carbon cloth (CC) as the counter electrode and a platinum plate as the working electrode. The TBABF 4 catalyst effectively cleaved the α-O-4 bond in the lignin model molecule with notable selectivity and minimal formation of by-products, resulting in a substantial conversion rate of benzyl phenyl ether (95.7 %) and a high yield of benzaldehyde dimethyl aceta (92.4 %) under specific conditions. This investigation showcases a mild electrochemical catalytic depolymerization approach for lignin model molecules at ambient temperature, thereby presenting novel avenues for further exploration in the field.
研究领域:
化学工程
·
可再生资源利用
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Yuanfang Hu,Bingxi Wang,Xiao Li,Dongyang Chen,Weiying Zhang
To develop high performance anion exchange membranes (AEMs), a novel bisphenol monomer bearing eight benzylmethyl groups at the outer edge of the molecule was synthesized, which after condensation polymerization with various amounts of 4,4′-dihydroxydiphenylsulfone and 4,4′-difluorobenzophenone yielded novel poly(arylene ether)s with densely located benzylmethyl groups. These benzylmethyl groups were then converted to quaternary ammonium groups by radical-initiated bromination and quaternization in tandem, leading to the emergence of densely quaternized poly(arylene ether sulfone)s (QA-PAEs) with controlled ion exchange capacities (IECs) ranging from 1.61 to 2.32 mmol g −1 . Both small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) studies revealed distinct phase separation in the QA-PAEs. The QA-PAE-40 with an IEC of 2.32 mmol g −1 exhibited a Br − conductivity of 9.2 mS cm −1 and a SO 4 2− conductivity of 14.0 mS cm −1 at room temperature , much higher than those of a control membrane with a similar IEC but without obvious phase separation. Therefore, phase separation of AEMs was validated to be advantageous for the efficient conducting of anions. The experimental results also showed that the QA-PAEs were promising AEM materials, especially for non-alkaline applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2016
·
IF 1.758
Lina Song,Changzhi Yan,Wei Zhang,Haoan Wu,Zhengyang Jia,Ming Ma,Jun Xie,Ning Gu,Yu Zhang
This study reports the synthesis of three kinds of manganese-doped magnetic ferrite nanoparticles (MnFe2O4) in benzyl ether, octyl ether, and 1-octadecene by a simple and low cost thermal decomposition method. It was found that benzyl ether results in a dramatic improvement in nanoparticle crystallinity owing to its stronger reducibility compared to octyl ether and 1-octadecene, as demonstrated by X-ray diffraction and TEM measurements. Raman spectroscopy detection also indicated that the reducing solvent of benzyl ether was in favor of forming magnetite-like structure ferrite, while maghemite-like structured ferrite was obtained in octyl ether and 1-octadecene. The saturation magnetization () of MnFe2O4 synthesized in benzyl ether was 85 emu/g [Fe], which was 3 and 5 times larger than MnFe2O4 synthesized in octyl ether and 1-octadecene, respectively. The specific absorption rate (SAR) of MnFe2O4 nanoparticles synthesized in benzyl ether was 574 W/g, while MnFe2O4 nanoparticles synthesized in octyl ether and 1-octadecene have had much smaller SAR of 76 and 33 W/g, respectively. MnFe2O4 nanoparticles synthesized in benzyl ether also exhibit higher relaxivity ( mM−1 s−1) than those synthesized in octyl ether and 1-octadecene ( and 22 mM−1 s−1). It was obvious that MnFe2O4 nanoparticles synthesized in reducing benzyl ether have higher crystallinity and thus higher , SAR, and values, which can serve as a better candidate for hyperthermia and magnetic resonance imaging.
研究领域:
材料科学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 40
·15322-15329
·
IF 4.569
Xinze Du,Chaofeng Zhang,Shenglin Liu
The selective activation of C–O ether bonds is an essential tool in organic synthesis and natural polymer depolymerization. However, the direct cleavage of the ether bond is still challenging work, especially breaking this inert and redox-neutral bond to provide one active carbon radical and another oxygen-centered fragment with oxidation capacity that can participate in the controllable radical reaction. We herein report that commercial 2H-MoS2 with negligible acidity can efficiently catalyze the benzylation of arenes with benzyl ethers, and a new Radical-Friedel–Crafts mechanism is proposed, which is quite different from the strong acid-catalyzed Friedel–Crafts mechanism. With dibenzyl ether as the model benzylation reagent, 2H-MoS2 can achieve the homolytic cleavage of the Bn–OR bond to generate the benzyl carbon radical and RO˙ species, identified by EPR measurement and radical trap experiments. The following radical-involved benzylation is confirmed by the Hammett results and a plausible pathway is proposed to clarify the Radical-Friedel–Crafts process. Heterogeneous 2H-MoS2 can be consecutively used four times without regeneration and it offers 94–95% yields of 2-benzyl-1,4-dimethylbenzene from dibenzyl ether and p-xylene in 30 min at 140 °C. Furthermore, this mechanism can provide some inspiration to activate the ether bond and to utilize ether as an oxidant in C–H bond activation.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Xi Zhu,Chunhui Shen,Shanjun Gao,Huaiyang Jin,Xiangze Cheng,Chenliang Gong
A series of high-temperature proton exchange membranes were prepared by incorporating phosphonic acid functionalized siloxane synthesized from Amino Trimethylene Phosphonic Acid (ATMP) and 3-Aminopropyltriethoxysilane (APTES) into cross-linked 1-Methylimidazole-functionalized poly(2,6-dimethyl-1,4-phenyleneoxide) (PPO) backbone. The structural characteristics of membranes were investigated using FT-IR, 1 H NMR and XRD , indicating that ATMP and backbones of membranes were successfully immobilized into cross-linking Si-O-Si networks formed by hydrolysis-polycondensation of APTES. The resultant membranes named as HTM-X exhibited superior oxidative resistance, mechanical properties and dimensional stability, even the thermal stability was up to 210 °C. The proton conductivities of membranes were also measured under different temperature. The result showed that HTM-15 membrane, whose content of phosphonic acid functionalized siloxane was 15 wt%, possessed the highest proton conductivity of 8.48 × 10 −2 S cm −1 at 160 °C and low relative humidity (5%) with the contribution of dual proton transfer channels of acid-base pairs and continuous hydrogen bond networks. Therefore, this novel membrane acts as a potential candidate for proton exchange membranes operating at elevated temperature.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Zhengfang Zhu,Peng Cui,Yu Lu,Jianrong Wu,Jing Zeng,Weiye Ma,Xinsheng Zhao,Yuanqin Zhu
To develop a facile route towards anion conductive polymers containing multi-cation side chains, novel anion conductive poly (2,6-dimethylphenylene oxide)s (DQPPO-x-I) was prepared from a clickable di-quaternized side-chain precursor, via Cu(I)-catalyzed azide-alkyne click chemistry. The new precursor was synthesized from commercially available 2-{[2-(dimethylamino)ethyl]methylamino}ethanol and 3-bromopropyne via nucleophilic substitution and Menshutkin reaction . The chemical structures of the precursor and DQPPO-x-I polymers were characterized by 1 H NMR and FT-IR. Small angle X-ray scattering and transmission electron microscopy revealed that the obvious micro-phase separation was formed in the DQPPO-x-I membranes. The optimized DQPPO-19-OH membrane with ion exchange capacity of 2.13 meq./g exhibited the highest hydroxide conductivity of 31.6 mS/cm at 80 °C, tensile strength of 64 MPa, and thermal stability (onset decomposition temperature up to 187 °C).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Marine Drugs
·
2022
·Vol. 20
·期 5
·322
·
IF 6.085
Han-Zhuang Weng,Jun-Yu Zhu,Fang-Yu Yuan,Zhuo-Ya Tang,Xiao-Qing Tian,Ye Chen,Cheng-Qi Fan,Gui-Hua Tang,Sheng Yin
Chromatographic fractionation of the EtOH extracts of the marine-derived fungusAspergillusversicolorA18 has led to the isolation of 11 homo/hetero-dimers of aromatic bisabolane sesquiterpenoids including eight diphenyl ether-coupled aromatic bisabolanes (1a/1band5–10) and three homodimers (2–4), together with their monomers including three aromatic bisabolanes (11–13) and two diphenyl ethers (14and15). Their structures and absolute configurations were elucidated by extensive spectroscopic analysis including HRESIMS, 1D/2D NMR, calculated ECD, and the optical rotatory data. Among the four new compounds, (+/−)-asperbisabol A (1a/1b), asperbisabol B (2), and asperbisabol C (3), the enantiomers1aand1brepresent an unprecedented skeleton of diphenyl ether-coupled aromatic bisabolane sesquiterpenoids with a spiroketal core moiety. The neuroprotective effects of selected compounds against sodium nitroprusside (SNP)-induced injury were evaluated in PC12 cells by the MTT assay. Five compounds (1a,6, and8–10) showed remarkable neuroprotective activities at 10 μM, being more active than the positive control edaravone.Keywords:diphenyl ether-coupled aromatic bisabolane;aromatic bisabolane dimer;marine-derived fungus;Aspergillus versicolor;neuroprotective activity
研究领域:
海洋天然产物化学
·
神经药理学
·
微生物代谢物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）