JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2018
·
IF 3.468
Hao Chen,Hao Cheng,Feng Zhou,Kequan Chen,Kai Qiao,Xiuyang Lu,Pingkai Ouyang,Jie Fu
The synthesis of highly selective catalysts for the catalytic fast pyrolysis (CFP) of biomass into valuable aromatics remains a challenge. This report describes the synthesis of hierarchical ZSM-5 catalysts by the NaOH desilication of conventional HZSM-5 for the CFP of rice straw to aromatics in a Tandem μ-reactor system coupled directly to a GC/MS equipped with FID and TCD. Catalysts were treated with a mild HCl wash and metal loading to increase the catalytic activity and reduce the deactivation. The effects of acidity, mesoporosity and incorporation of metals on the production of aromatics were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption and desorption (N 2 -BET) and temperature-programmed desorption of NH 3 (NH 3 -TPD). The highest total acidity, especially the strong acidity, of the hierarchical ZSM-5 treated by 0.2 and 0.4 NaOH followed by HCl washing (AHZ-0.2 and AHZ-0.4) gave the highest yields of aromatics. Suitable mesopores introduced by alkali treatment enhanced mass transfer of reactants, increasing the yield of aromatics. Finally, the loading of a suitable amount of Ni and Cu produced more aromatics than standard HZSM-5 due to the improved decarboxylation/decarbonylation reactions leading to higher yields of olefins.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-12
·
IF 5.3
Wang Yanping,Guo Min,Li Yuanyuan,Chen Yan,Wei Hong,Mo Xiaohui,Chai Guolin,Du Yongling,Hu Fangdi
A dual-template molecularly imprinted electrochemical sensor was developed for the simultaneous detection of serotonin (5-HT) and glutamate (Glu). First, amino-functionalized reduced graphene oxide (NRGO) was used as the modification material of a GCE to increase its electrical conductivity and specific surface area, using Glu and 5-HT as dual-template molecules and o-phenylenediamine (OPD) with self-polymerization ability as functional monomers. Through self-assembly and electropolymerization, dual-template molecularly imprinted polymers were formed on the electrode. After removing the templates, the specific recognition binding sites were exposed. The amount of NRGO, polymerization parameters, and elution parameters were further optimized to construct a dual-template molecularly imprinted electrochemical sensor, which can specifically recognize double-target molecules Glu and 5-HT. The differential pulse voltammetry (DPV) technique was used to achieve simultaneous detection of Glu and 5-HT based on their distinct electrochemical activities under specific conditions. The sensor showed a good linear relationship for Glu and 5-HT in the range 1 ~ 100 μM, and the detection limits were 0.067 μM and 0.047 μM ( S / N = 3), respectively. The sensor has good reproducibility, repeatability, and selectivity. It was successfully utilized to simultaneously detect Glu and 5-HT in mouse serum, offering a more dependable foundation for objectively diagnosing and early warning of depression. Additionally, the double signal sensing strategy also provides a new approach for the simultaneous detection of both electroactive and non-electroactive substances.
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PubMed
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Ziyang Guo,Liyuan Qin,Haoming Zou,Xiao Ma,Dongliang Wang,Yansong Shi,Xijuan Lv,Yujie Qiang,Wei Guo,Qinghai Shu
This study investigates the corrosion mechanism of carbon steel (CS) induced by high-energy density materials (HEDMs), NTO and AP. CS exhibited corrosion rates of 1.314 mm/y and 8.690 mm/y when exposed to NTO and AP powders, respectively. However, these rates shifted to 9.050 mm/y for NTO and 3.597 mm/y for AP in solution. Experiments combining grand canonical Monte Carlo (GCMC) and ab initio molecular dynamics (AIMD) simulations demonstrate AP’s greater susceptibility to hygroscopicity, establishing a corrosive environment. CS maintains an unabated corrosion rate as Cl - from AP reduction damages corrosion products. Conversely, NTO’s compact corrosion products effectively delay CS corrosion.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Junfan Zhang,Peiya Chen,Huai Liu,Rui Zhang,Wenlong Jia,Junhua Zhang,Lincai Peng
Modulating the electronic structure of metal nanoparticles (NPs) demonstrates to be useful for the optimization of the catalytic performance. Herein, electron-sufficient ruthenium NPs were successfully constructed on a nitrogen-doped carbon support (Ru x -NC), which displayed excellent catalytic activity for the oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA). Especially, a high FDCA yield of 97% was implemented over Ru 2.0 /NC catalyst in water. The FDCA productivity in this case is also as high as 4.8 mol FDCA ‧mol Ru −1 ‧h −1 , which value exceeds most of the previous reported Ru-based catalysts for the production of FDCA. It has been disclosed that the Ru 2.0 /NC was endowed with high N content and abundant electron-rich Ru 0 NPs evoked by the electronic interactions between the NC support the Ru NPs. These facts greatly contribute to the activation of O 2 , and accelerate the oxidation both of the hydroxymethyl and aldehyde groups of HMF to the carboxyl one. This work provides new understanding for the development of effective Ru-based catalysts for the catalytic oxidation reactions by the electronic structure regulation strategy.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Mengting Chen,Minjie Zhu,Tingyu Zhou,Qifeng Zhong,Meihua Zhang,Yingxin Liu,Zuojun Wei
SAPO-5 zeolite supported RuMn was a highly efficient catalyst for the aqueous-phase selective hydrodeoxygenation of guaiacol to cyclohexanol. The optimal catalyst achieved a high cyclohexanol yield of 93.7% at full guaiacol conversion under mild conditions, with a high TOF of 920 h -1 . Moreover, the catalyst displayed remarkable performance for the hydrogenation of phenol to cyclohexanol, where a 100% yield of cyclohexanol was obtained at a phenol-to-Ru molar ratio of about 17900. In particular, the catalyst exhibited excellent recyclability and could be recycled for 20 times without obvious activity loss. The as-prepared RuMn/SAPO-5 catalyst exhibited higher performance than most of the reported Ru-based catalysts.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2012
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IF 2.986
Linping Sun,Xinwen Guo,Guang Xiong,Xiangsheng Wang
The ethylation of coking benzene with ethanol over nano-sized ZSM-5 zeolites modified with Y 2 O 3 , La 2 O 3 and CeO 2 was investigated in a fixed-bed reactor. Nano-sized ZSM-5 zeolite modified with Y 2 O 3 was more stable than the other two samples during the reaction. The results from NH 3 -TPD, Py-IR, and TG-DTA show that the strong Brønsted acid sites were eliminated, consequently suppressing coke deposits during the reaction. Combined with the results from 1 H NMR and 129 Xe NMR spectra, it is concluded that the hydrated Yttrium ions with small size reached deep location in zeolite channel.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Shan Cheng,Yi Fu,Hong Tian,Yi Cheng,Jiawei Wang,Jiang Zhu,Linxi Guo,Xuan Huang
The selectivity and catalytic mechanism of HZSM-5 in the pyrolysis of lignin model compounds at 600 °C were investigated using Py-GC/MS and density functional theory (DFT). The findings indicate that HZSM-5 elevated the relative content of aromatic hydrocarbons in the pyrolysis products of phenol, vanillin, and syringol by 12.3 %, 11.7 %, and 7.5 %, respectively. Meanwhile, the relative content of oxygen-containing products, including aldehydes and acids, was reduced by 15.7–52.0 %. Throughout the pyrolysis of lignin model compounds, various side chain reactions take place, such as dissociation, decarbonylation, isomerization rearrangement, alkylation, and aromatization. The selective catalytic decomposition mechanism of HZSM-5 on oxygen-containing functional groups involves both the physical selection imparted by the pore size structure and the selection of acid sites that form hydrogen bonds with hydroxyl, carbonyl, and methoxy groups. This mechanism was corroborated by DFT calculations, which showed that the energy barriers for the removal of most oxygen-containing functional groups were lowered by 1.7–72.4 kJ/mol. These results provide an in-depth understanding of the catalytic pyrolysis of lignin and pave the way for future research on the high-value utilization of waste lignin.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Mingzhu Yao,Yi Liu,Lisha Qin,Xiangyu Li,Xing Long,Chengrong Qin,Chen Liang,Caoxing Huang,Shuangquan Yao
The selective and efficient separation of hemicellulose is a challenge for utilizing lignocellulosic biomass for high-value purposes. This study reports the development of a novel homogeneous acid-catalyzed pretreatment technique based the homologous action of both FeCl 3 and 5-sulfosalicylic acid (5-SAA). The optimal separation conditions (5-SAA concentration of 7.0 %, reaction temperature of 130 ° C, FeCl 3 concentration of 0.15 mol·L −1 , and reaction time of 60 min) enabled a high hemicellulose separation efficiency of 90.68 %. The hemicellulose-derived total sugar yield was as high as 83.05 % which was increased by 30 %. Moreover, the xylose yield was increased by 10 %, and the content of oligosaccharides was triple higher than that in the single component treatment, up to 19.64 %. The depolymerization and recondensation of lignin were prevented using the 5-SAA hydrophobic structure (benzene ring structure) and hydrophilic end (−HSO 3 and −COOH). The proposed strategy is a promising approach that can enable an efficient and selective separation of hemicellulose and consequently improve the quality of biomass materials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 35
·15512-15523
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IF 2.7
Sen Fu,Hanxu Guo,Hong Yuan
A nano-ZSM-5 zeolite having a hierarchical pore structure was synthesized using L-lysine as a mesopore template and growth inhibitor. The effects of the L-lysine/Si and Si/Al molar ratios on the morphology and pore structure of the zeolite were studied. The products were characterized by scanning electron microscopy, transmission electron microscopy and N2-Brunauer–Emmett–Teller surface area analysis. These assessments showed that the particle size of the ZSM-5 zeolite could be reduced to 60 nm with a surface area as high as 395 m2 g−1 and a high density of mesopores. These zeolites were applied to the catalytic pyrolysis of oleic acid in a fixed-bed reactor to generate benzene, toluene and xylenes (BTX). At a reaction temperature of 500 °C, the catalyst having L-lysine/Si and Si/Al ratios of 0.4 and 30, respectively, gave a BTX yield of 27.4 wt%. This yield decreased with increases in the Si/Al ratio whereas varying the L-lysine/Si ratio did not produce a specific trend. The spent catalyst was characterized by thermogravimetric analysis and exhibited superior anti-coking ability and longer catalytic lifetime compared with a standard ZSM-5 zeolite.
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高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 26
·3501-3508
·
IF 2.6
Manman Wang,Xing Zhang,Zifeng Wang,Dongze Li,Shusen Chen,Qinghai Shu
3-Nitro-1,2,4-triazole-5-one (NTO) has received wide attention and has applications owing to its excellent detonation performance and low sensitivity. A new crystal form of NTO was prepared via the solvent evaporation method and named γ-NTO. Its crystal properties were studied through single-crystal X-ray diffraction, and the results indicated that the unit cell of γ-NTO belongs to the monoclinic space group Pc, with eight molecules in the single unit cell. The density of this crystal is calculated to be 1.907 g cm−3, which is higher than that of β-NTO and similar to that of α-NTO. The crystal morphology was calculated to be a polygonal shape with a symmetrical growth pattern using the reactive force field. Based on the analysis of reactive molecular dynamics, the thermal decomposition mechanism of different crystal forms of NTO was elucidated, and the results showed that γ-NTO demonstrates higher gas production, providing a successful way to enhance detonation performance. The results of IR and differential thermal analysis (DTA) support the above conclusions.
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Molecular Catalysis
·
2025
·
IF 4.9
Wanqing Sun,Jilei Xu,Lei Li,Zhu Liu,Zuoyi Xiao,Qingda An,Jiahui Huang
5,5′(oxy-bis(methylene)) bis-2-furfural (OBMF) is an important biobased chemical that can be synthesized through the self-etherification of 5-hydroxymethylfurfural (HMF) in the presence of either homogeneous acid or solid acid catalysts, such as p-toluenesulfonic acid (PTSA) and molecular sieves. In previous studies, all authors believed that this process follows an acid-catalyzed mechanism, even though some argued that acid strength is not the key factor in the formation of OBMF. In this work, we present a new route for the synthesis of OBMF from HMF, utilizing hydrogen-bonding catalysis with protonated ionic liquids under metal-free conditions. [NMPH][OTf] featuring a cationic hydrogen bond donor and an anionic hydrogen bond acceptor, is effective for the self-etherification of HMF. Under the optimal conditions, the yield of OBMF reached approximately 92.4 %. Based on the results of Attenuated Total Reflectance Infrared Spectroscopy (ATR-IR), Nuclear Magnetic Resonance (NMR) and Density Functional Theory (DFT) calculation, it is determined that the cations and anions of ILs could activate the C O and O H bonds of HMF via hydrogen bonds respectively. This synergistically facilitates the self-etherification of two HMF molecules to form OBMF. After recycling the catalyst four times, the yield of OBMF did not decrease significantly. According to the Arrhenius law, the apparent activation energy and reaction order for [NMPH][OTf] in the self-etherification of HMF to OBMF are determined 40.7 kJ/mol and 1.0, respectively. The results suggested that [NMPH][OTf] is an excellent catalyst for the generation of OBMF from HMF. Therefore, this study offers a simple and environmentally friendly method for the production of OBMF, which holds promising potential for broad application prospect in the future.
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高影响因子
Biofuels Bioproducts & Biorefining-Biofpr
·
2024
·Vol. 18
·期 6
·1994-2004
·
IF 3.2
Wanling Shen,Haihang Zhu,Xiaoman Cheng,Xin Li
Mesoporous niobium-based solid acid catalysts were successfully synthesized using the soft template method with sodium lignosulfonate (SLS) as the template. In most studies the template is calcined to form mesopores after hydrothermal synthesis; however, in this study SLS was retained to produce niobium-carbon composite catalysts. The catalysts obtained were characterized by X-ray diffraction, nitrogen adsorption–desorption, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and static contact angle measurements. The catalytic activity of the solids was also investigated in the conversion of glucose to 5-hydroxymethylfurfural (HMF) using pure water as the solvent. Under optimal conditions, niobium-carbon composite catalyst achieved a glucose conversion yield of 65.1% and an HMF yield of 42.1%. The enhanced catalytic activity was attributed to the timely extraction of the HMF by the carbonized SLS.
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