RENEWABLE ENERGY
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2024
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IF 9
Ya-Peng Du,Xin-Yu Tian,Xiao-Ping Zheng,Yu Chai,Yu-Cang Zhang,Yan-Zhen Zheng
In this study, an innovative method for the high-efficiency production of 5-hydroxymethylfurfural (5-HMF) from cellulose were developed, overcoming the inherent recalcitrant physicochemical properties of cellulose. The method initiated with the ultra-high-pressure homogenization (UHPH) of a cellulose and formic acid mixture. This pre-treatment could highly enhance the 5-HMF yield compared with the reported pretreatment method. Following this, a catalytic system comprising a metal-based ionic liquid , 1-butyl-3-methylimidazole chloroaluminate ([BMIM][AlCl 4 ]) and acetic acid, was utilized to transform the pre-treated cellulose into 5-HMF. Reaction parameters such as temperature, duration, DMSO concentration, cellulose substrate amount, and the balance of ILs and organic acids were optimized to obtain the highest yield of 5-HMF. Besides, a combination of experimental characterization methods with quantum chemical calculations, aiming to elucidate the pre-treatment mechanisms was conducted. The integration of formyl groups into the cellulose structure and the intense shear forces applied during UHPH were observed. These factors contributed to disrupting the cellulose's chemical stability, reducing particle size, and shifting cellulose's structure towards a blend of crystalline cellulose and amorphous forms with decreasing crystallinity. These changes collectively heightened the reactivity of cellulose for subsequent catalytic transformations, fostering more effective interactions between the catalyst and substrate and thereby elevating the efficiency of cellulose conversion to 5-HMF.
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CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Hongyu Qu,Wende Hu,Xiangcheng Li,Rui Xu,Xiao Han,Junjie Li,Yiqing Lu,Yingchun Ye,Chuanming Wang,Zhendong Wang,Weimin Yang
Selective hydrogenolysis of biomass-based platform compounds is of great importance for the production of chemicals and fuels. Herein, we reported that the catalyst of Ni-C 3 N 4 supported on H 2 activated carbon (HC) synthesized by a simple coordination-impregnation-pyrolysis method is efficient for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF); the yield of 94.2% can be obtained in a batch reactor and the lifetime of greater than 120 h can be achieved in fixed-bed experiment. It is demonstrated that Ni nanoparticles coated by graphitic C 3 N 4 shell were highly dispersed on the surface of HC and the Ni loading is as low as 0.86 wt%, beneficial to the anti-sintering of Ni nanoparticles during the reaction. Both XPS characterizations and theoretical calculations reveal that Ni 3 N is the intrinsic active component for the hydrogenolysis , which exhibits efficient activity for the dissociation of C–O bond. This work opens up a new avenue to develop catalysts with single non-noble metal component for the efficient conversion of biomass-based chemicals.
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FUEL
·
2024
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IF 6.7
Mei Ren,Jun Li,Manhong Huang,Donghui Chen,Xuelian Chen,Qi An,Songmei Sun
The escalating environmental issues resulting from waste plastic necessitate innovative decomposition methods that optimize conversion rates and product selectivity. In this study, we demonstrate that linear low-density polyethylene (LLDPE) can be effectively hydrothermolyzed into C1 − C4 compounds with a selectivity of 100 % in the presence of trace water on H-ZSM-5 catalyst under a relatively low temperature of 220 °C. Water plays a dual role here as both a solvent and a reactant. It was found the density of Brønsted acid sites is crucial for LLDPE decomposition, serving as the primary active centers for cracking LLDPE chains. In-situ EPR studies indicate a synergistic mechanism of free radical and carbenium ion pathways in LLDPE depolymerization. Density Functional Theory (DFT) simulations show that the depolymerization starts with the cleavage of a C–C bond in polyethylene, instigated by a hydrogen radical from the Brønsted acid site, leading to various intermediate stages for the formation of tert -butanol, acetone and acetic acid from two potential pathways. The presence of water is crucial in these pathways, aiding bond breakages and the creation of oxygenated products in the Brønsted acid site. This study represents a substantial leap forward in sustainable methodologies for upcycling plastic waste.
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Mengchuan Li,Tongsheng Zhang,Rensheng Li
The thermodynamic data of rare earth-containing systems are crucial for the development and application of permanent magnets, optoelectronic materials, high-temperature superconducting materials, and catalysts. In this study, the equilibrium phase compositions of the CaO-Ce 2 O 3 -SiO 2 -(5∼25 wt%) Al 2 O 3 system at 1873 K were investigated through high-temperature equilibrium experiments. The equilibrium phase compositions at 1873 K were determined using SEM, XRD, and EPMA, leading to the construction of isothermal sections. For the CaO-Ce 2 O 3 -SiO 2 -5 wt% Al 2 O 3 system, the isothermal cross-section diagram revealed a liquid phase region, four distinct two-phase equilibria, and two different three-phase equilibria. As the Al 2 O 3 content increased to 25 wt%, the isothermal cross-section diagram showed a liquid phase region, five different two-phase equilibria, and three distinct three-phase equilibria. The experimental results provide valuable insights for further research on the practical applications of cerium-containing rare earths in various fields.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
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IF 5.6
Pengjiang Liu,Zihao Yang,Weidong Li,Renjie Huang,Lin Luo,Zheng Li,Miao Zuo,Lu Lin,Xianhai Zeng
The compound 5-(Chloromethyl) furfural (CMF) is a novel and versatile biobased platform molecule, possessing numerous exceptional properties that position it as an outstanding alternative to 5-Hydroxymethylfurfural (HMF). In this work, we demonstrate a green and efficient route for direct production of CMF from biomass waste corncob residue with high substrate concentration in deep eutectic solvents (DESs). Ideal CMF yields of 27.51, 21.75, 17.84, and 16.01 % could be obtained from biomass substrate concentrations of 5, 10, 15, and 20 %, respectively. The DES/Methyl isobutyl ketone (MIBK) biphasic reaction system with effective cycling performance was raised to deal with various biomass feedstocks. Subsequently, we also synthesized solid acid catalysts 0.2Al/MCM-41 and applied them to the CMF preparation, which has significant advantages in cycling performance, although their catalytic performance is relatively low. Besides, further investigation of the formation process of CMF in DES is conducted through experiments and theoretical calculations.
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FOOD CHEMISTRY
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2024
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IF 8.5
Yuchi Zhang,Le Han,Bohan Li,Yan Xu
Exploring materials with the dual functionality of detecting and removing tetracycline (TC) residues is crucial because of the environmental and health risks posed by antibiotic overuse. This study introduces a dual-emissive luminescent probe, CDs@ZSM-5:Eu 3+ , created through a solvent-free method combined with subsequent Eu 3+ ion exchange. The nanocomposite's blue emission, originating from carbon dots (CDs), is quenched by TC via an internal filtering effect, while an antenna effect triggers a strong red fluorescence of a TC-Eu 3+ chelate. The ratiometric fluorescence changes in CDs@ZSM-5:Eu 3+ endow a self-calibrated sensing mechanism for TC, offering a low detection limit of 5.04 nM and a broad detection range of 0.01–50 μM. Demonstrated in real milk samples, the probe exhibits high selectivity and accuracy in detecting TC. The nanocomposite also displayed an impressive TC removal capacity of 238.1 mg g −1 in water, ascribing to the enrichment and electrostatic attraction effects of ZSM-5 toward TC molecules. This research offers a facile strategy for constructing multifunctional zeolite-based hybrids for simultaneous TC detection and removal from aqueous solutions.
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PubMed
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RENEWABLE ENERGY
·
2024
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IF 9
Hong Tian,Rui Zhu,Guangming Zhu,Jiawei Wang,Yi Cheng
The limitation in bio-oil quality hampers its further utilization in the fuel or chemical industry. This study employed a combination of tetra propylammonium hydroxide (TPAOH) and NaOH solutions for HZSM-5 desilication to enhance the yield of monocyclic aromatic hydrocarbons in the catalytic co-pyrolysis of wheat straw with polyethylene. Results revealed hierarchical HZSM-5, prepared with equal mole concentrations of NaOH and TPAOH, exhibited optimal catalytic performance. The bio-oil from this process had an aromatic content of 72 %, with monocyclic aromatic hydrocarbons (MAHs) constituting 56.26 %. Further optimization was achieved through iron modification of hierarchical HZSM-5. The addition of 0.5 % iron-modified hierarchical HZSM-5 increased the aromatic hydrocarbons to 80.57 %, with BTX compounds (benzene, toluene, and xylene) reaching a selectivity of 61.9 %. This approach reduced polycyclic aromatic hydrocarbons (PAHs), contributing to less coke formation, presenting a promising method for high-quality bio-oil.
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Sustainable Energy & Fuels
·
2024
·Vol. 9
·期 1
·152-171
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IF 5
Haoyu Liu,Wenbo Luo,Ke Wang,Yanlin Wang,Hong Yuan
The bolaform surfactant C6H13-N+(CH3)2-C6H12-N+(CH3)2-C6H12-O-C6H4-C6H4-O-C6H12-N+(CH3)2-C6H12-N+(CH3)2-C6H13 (BCPH-6-6-6) was synthesized and used to guide the synthesis of hierarchical ZSM-5 nanosheets (HZN) for use as zeolite catalysts. The number of acidic sites and the Al distribution in the zeolite pores were varied by changing the amounts of sodium sulfate and Al in the initial gel. The X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, NH3 temperature programmed desorption, 27Al magic angle spinning nuclear magnetic resonance spectroscopy and N2 adsorption/desorption were used to characterize these materials. These zeolites each had a well-developed hierarchical system and specific surface areas as high as 631 m2 g−1, indicating that the BCPH-6-6-6 formed lamellar micelles based on π–π stacking. Interconnected hierarchical pore structures were retained after the templating agent was removed. The HZN sample exhibited a 90° rotational intergrowth structure and retained a large number of lamellae. The same material had a high concentration of acidic sites and contained Al in a tetrahedral coordination framework. The catalytic cracking of oleic acid using this zeolite gave light olefin yields up to 52.2% at 500 °C, exceeding the performance of conventional ZSM-5 (38.9%), and the catalyst remained active for up to 60 h. At 450 °C, the BTX selectivity of 6.72% obtained with this material also exceeded that from the conventional ZSM-5. These results were attributed to the connected hierarchical pores of the HZN, which promoted diffusion and provided higher carbon resistance.
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Molecular Catalysis
·
2024
·
IF 3.9
Yin Wang,Haihong Xia,Fei Ge,Yanrong Wang,Xiaohui Yang,Jianchun Jiang,Minghao Zhou
The catalytic conversion of 5-hydroxymethylfurfural (5-HMF) to value-added chemicals was quite vital for the conversion and utilization of biomass resources. The development of novel and efficient catalysts was of great significance. In this work, a series of tannic acid doped catalysts (Ni-Co/TA@C) were prepared by hydrothermal self-assembly method using lignosulfonate as a building block and coordinating with metal ions Ni 2+ and Co 2+ . The effects of different preparation conditions and reaction conditions on the performance of the catalysts were investigated, and the optimal conditions for catalytic transfer hydrogenation were also explored. The results showed that the conversion of 5-HMF was 99.97% and the yield of 2,5-dimethyl furan (DMF) was as high as 87.10% with Ni 2 Co/TA@C as catalyst under mild reaction conditions (240 °C, 2 MPa N 2 , 4h). The surface morphology, surface area and composition of the catalysts were characterized in detail. The Ni 2 Co/TA@C catalyst had higher total acidity and larger amount of strong acid sites, which was conducive to highly selective catalytic transfer hydrogenation (CTH) of DMF, and the larger specific surface area also promoted the dispersion and loading of Ni and Co. This study provided some novel findings for the construction of catalysts for biomass conversion.
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CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Xu Gao,Aihu Feng,Le Mi,Yang Yu,Yun Yu
Adsorption is one of the most effective methods for controlling the concentration of VOCs pollution. In this work, the hierarchical NaY zeolites with size-controlled mesopores in the range of 2–5 nm are obtained via NH 4 HF 2 -etching and surfactant-templating process. By using the different cationic surfactant (C n TAB), we fabricate the surfactant-templated zeolite with controllable mesopores, and improve its adsorption capacity for toluene. In addition, the modified zeolite’s hydrophobicity is enhanced, and it maintains a high adsorption capacity in a complex humid environment.
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Veterinary Sciences
·
2024
·Vol. 11
·期 3
·135
·
IF 2
Yiyi Shan,Qi Xiao,Kongwang He,Shenglong Wu,Wenbin Bao,Zhengchang Wu
Simple SummaryPorcine circovirus type 2 (PCV2) infection can cause immunosuppression in pigs, create conditions for other virus infections, and bring serious economic losses to the pig industry. 5-Azacytidine (5-Aza) is a potent inhibitor of DNA methylation. In this study, we focused on the effects of 5-Aza on PCV2 infection in porcine kidney cells (PK15 cells). We found that 5-Aza could activate cell apoptosis and inflammatory factors and promote PCV2 replication through the MAPK signaling pathway.AbstractPorcine circovirus type 2 (PCV2) is the main pathogen causing post-weaning multisystemic wasting syndrome (PMWS), which mainly targets the body’s immune system and poses a serious threat to the global pig industry. 5-Azacytidine is a potent inhibitor of DNA methylation, which can participate in many important physiological and pathological processes, including virus-related processes, by inhibiting gene expression. However, the impact of 5-Aza on PCV2 replication in cells is not yet clear. We explored the impact of 5-Aza on PCV2 infection utilizing PK15 cells as a cellular model. Our objective was to gain insights that could potentially offer novel therapeutic strategies for PCV2. Our results showed that 5-Aza significantly enhanced the infectivity of PCV2 in PK15 cells. Transcriptome analysis revealed that PCV2 infection activated various immune-related signaling pathways. 5-Aza may activate the MAPK signaling pathway to exacerbate PCV2 infection and upregulate the expression of inflammatory and apoptotic factors.
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ChemistrySelect
·
2025
·Vol. 10
·期 4
·e202404857
·
IF 2
Wei Jiang,Chenkang Zhao,Yanfeng Liu,Yu Zu,Hongyu Guo,Guanghui Zhao,Weizhong Wang,Yong Sun
Graphical In this study, a straightforward coprecipitation method was employed to synthesize the bimetallic catalyst MnO@Co-CN, which demonstrates high efficiency in catalyzing the direct oxidative esterification of HMF to produce FDMC with a yield reaching 90.3%. The synergistic interactions between the dual metals during the reaction significantly enhance the catalytic performance for optimal oxidative esterification. As a versatile platform molecule derived from biomass, 5-hydroxymethylfurfural (HMF) has the potential to be transformed into a variety of chemicals. Of these, furan-2,5-dimethylcarboxylate (FDMC) stands out as an excellent precursor for the synthesis of poly(ethylene furandicarboxylate) (PEF), a polymer with broad applications in the production of various polymeric materials. However, a majority of studies have focused on the use of noble metal catalysts to achieve the direct oxidative esterification of HMF for the production of FDMC. Given the scarcity and high cost of noble metal catalysts, there is a pressing need to develop non-noble metal catalysts to efficiently facilitate the direct oxidative esterification of HMF. Accordingly, a bimetallic catalyst, MnO@Co-CN, was prepared in this paper by a simple coprecipitation method, and a 90.3% FDMC yield was obtained under optimal conditions. The findings revealed that in the oxidative esterification of HMF, MnO x predominantly adsorbs the reactants onto the catalyst surface, whereas CoO x is primarily responsible for the oxidation. The synergistic interaction between Mn and Co enhances the catalytic performance, leading to the superior oxidative esterification outcomes. This work offers a cost-effective, scalable method for FDMC synthesis, highlighting potential for industrial applications.
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