ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Juncheng Yang,Yihong Jia,Benhua Huang,Xiaoyong Li,Lina Guo,Aqun Zheng,Rafael Luque,Yang Sun
1,4-Sorbitan and 1,4-mannitan are important precursors for the synthesis of detergents and pharmaceuticals, derived from mono-dehydration of sugar alcohols (d-sorbitol and d-mannitol). In order to improve mono-dehydration selectivity, functionalized CeO2/SBA-15 materials were synthesized and employed as dehydration catalysts. Characterization revealed that all synthetic catalysts contain cerium dioxide nanoparticles with sizes below 10 nm. All prepared catalysts provided 1,4-sorbitan or 1,4-mannitan as the major dehydration products in water at room temperature, with catalysts being nicely active and stable after several reuses.
研究领域:
催化化学
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材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Wenhua Xu,Yuanhai Su,Yang Song,Minjing Shang,Li Zha,Qinghua Lu
Cyclobutanetetracarboxylic dianhydride (CBDA) was prepared by photodimerization of maleic anhydride in capillary microreactors within Taylor flow under UV irradiation. Both inert gas and ultrasound were introduced into this photochemical process to avoid the potential channel clogging resulting from the CBDA deposition. Higher input power of the Hg lamp, lower reactant concentration, longer residence time, and smaller inner diameter of the capillary were found to result in higher CBDA yield. The yield of CBDA could reach as high as 66.3% at an actual residence time of 30 min in the capillary microreactor with 0.5 mm inner diameter. According to the analysis of energy conversion, only low effective photoelectric transformation efficiencies could be achieved in this photochemical process. However, the photonic efficiency for this photodimerization carried out in capillary photomicroreactors was much higher compared to batch photoreactors and was comparable with that for other photochemical transformations using similar photomicroreactors and light sources.
研究领域:
化学工程
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光化学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 76
·72744-72749
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IF 3.289
Fei Xia,Zhongtian Du,Junxia Liu,Yangyang Ma,Jie Xu
Recently, obtaining value-added chemicals from biomass resources has attracted considerable attention. Levulinic acid is one of the most important biomass platform compounds, which could be obtained from carbohydrate biomass. In this work, levulinic acid was selectively converted into C4 product, including succinic anhydride, via catalytic oxidation with a manganese catalyst in acetic anhydride. Moreover, an unexpected product of maleic anhydride was obtained, which greatly differs from that of levulinate ester. The pathway for formation of maleic anhydride was studied by monitoring and confirming intermediates α-angelica lactone and its derivative 2-methyl-5-oxotetrahydro-2-furanyl acetate. Based on the obtained mechanistic information, the different behaviour between the oxidative cleavage of levulinic acid and levulinate ester was further discussed.
研究领域:
化学工程
·
可再生资源化学
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产品关联
DOI
高影响因子
JOURNAL OF BIOTECHNOLOGY
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2024
·
IF 4.1
Bingbing Xia,Zhiwei Li,Jinao Wei,Ganpeng Hu,Jingwen Yang,Hongbin Zhang,Xueqin Hu
Dextranases are hydrolases that exclusively catalyze the disruption of α−1,6 glycosidic bonds . A series of variant enzymes were obtained by comparing the sequences of dextranases from different sources and introducing sequence substitutions. A correlation was found between the number of amino acids in the 397–401 region and the hydrolytic process. When there were no more than 5 amino acids in the 397–401 region, the enzyme first hydrolyzed the dextran T70 to a low molecular weight dextran with a molecular weight of about 5000, then IMOs 1 appeared in the system if the degradation continued, showing a clear sequential relationship. And when there are more than 5 amino acids in the 397–401 region, IMOs were produced at the beginning of hydrolysis and continue to increase throughout the hydrolytic process. At the same time, we investigated the enzymatic properties of the variants and found that the hydrolytic rate of A-Ca was 11 times higher than that of the original enzyme. The proportion of IMOs produced by A-Ca was 80.68%, which was nearly10% higher than the original enzyme, providing a new enzyme for the industrial preparation of IMOs.
研究领域:
生物化学
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酶学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2023
·
IF 4.6
Mengmeng Xu,Yingxia Zong,Chengzhong Zong
The effects of magnesium maleate (MgMA) and maleic anhydride (MAH) on the interfacial interaction and the shape memory properties of ethylene propylene diene monomer (EPDM) and polypropylene (PP) thermoplastic vulcanizate (TPV) with sea island structure prepared by dynamic vulcanization were investigated in this study. PP matrix could maintain the temporary shape of TPVs and the crosslinked EPDM phase supplied stress to drive the deformed shape recovery during the shape memory process. MgMA and MAH grafted on PP and EPDM chains verified by FTIR, DMA and SEM, which improved the interfacial compatibility of EPDM and PP and enhanced the efficiency of stress transfer in the shape memory process. The shape fixity ratio (R f ) and shape recovery ratio (R r ) of TPVs compatibilized by MgMA and MAH were almost above 80%. The shape memory property and the mechanical performance of TPVs were all improved compared to that of the sample without compatibilization .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Yunxia Xia,Tuo Di,Zhaohui Meng,Tingting Zhu,Yujie Lei,Sheng Chen,Tiesheng Li,Lei Li
The evolution of preparation methodology is critical for the development of new porous organic polymers (POPs) and their applications. Based on the polymerization mechanism elucidated in our previous reports (Zhu, T. T., et al., Green Chem. 2019, 21, 2326;Zhu, T. T., et al., Green Chem. 2020, 22, 7003), self-cross-linkable monomers were produced in situ using a “two-in-one” monomer bridge: maleic anhydride (MA), double bonds were formed via an imidization reaction between an acid anhydride group and an amino/isocyanate group, while networks were further formed through sequential cross-linking reactions among self-condensable monomers. Similarly, replacing MA with 4-ethynylphthalic anhydride (EPAH), POPs with expected structures and high surface area (Max = 1212 m2/g) could be accomplished within only 2 h, demonstrating the versatile and expandable characters of this improved domino polymerization methodology. In this study, a novel, efficient, and versatile domino polymerization strategy for POP preparation in one pot was proposed. Moreover, by direct thermal transformation of M-POP-P without activation, a porous carbon material (CM-POP-P) can be easily obtained, which exhibits a similar performance to the other nitrogen-doped carbon supercapacitors that need activation.
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
CATALYSIS COMMUNICATIONS
·
2014
·
IF 3.32
Yao Ma,Yangqiang Huang,Youwei Cheng,Lijun Wang,Xi Li
Ru-based catalysts, supported on activated carbon and carbon nanotubes, were synthesized by a simple and eco-friendly bioreduction method and tested in the liquid-phase hydrogenation of maleic anhydride. Over 2.0% Ru/AC, succinic anhydride was produced with a maximum yield of 99.2% without further hydrogenation to γ-butyrolactone. Well-defined spherical shapes with uniform small size of Ru nanoparticles and the residual plant biomass were responsible for the excellent catalytic activities and stabilities.
研究领域:
催化化学
·
纳米材料科学
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绿色化学
·
有机合成
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环境友好催化
·
生物质转化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hao Wang,Libin Ji,Liang Li,Xiaorong Guo,Haitao Li,Yin Zhang,Jun Ren,Chenghua Zhang,Yongxiang Zhao
The hydrogenation of maleic anhydride (MA) to succinic anhydride (SA) is a highly selectivity-sensitive reaction, significantly influenced by catalyst activity and temperature. Excessive hydrogenation often leads to the formation of other byproducts and the decreasing of SA selectivity. A key industrial challenge lies in achieving both high MA conversion and SA selectivity under industrial operating conditions. In this paper, a confined metal Ni catalyst anchored on mordenite (MOR) zeolite was prepared by a simple and low-cost method, and its acidity was regulated by alkali metal ion. The results show that compared with SiO 2 and Al 2 O 3 as supports, the Ni/MOR catalyst achieves an excellent MA conversion of about 100 %, and a remarkable SA selectivity up to 99 %. Meanwhile, the stability of the Ni/MOR catalyst has been significantly improved. With the similar conversion rate of MA, the reaction cycle numbers of Ni/MOR are twice that of the traditional Ni/SiO 2 catalyst. This is attributed to the confinement effect of the MOR channels, which slightly reduces the activity of the metal and then effectively inhibits the over‑hydrogenation process of SA. In addition, a combination of theoretical calculation and experimental characterization was used to deeply study the reaction mechanism of high-selective hydrogenation of MA to SA.
研究领域:
催化化学
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化学反应工程
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工业化学
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材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Chengliang Wang,Xia Guo,Jinbian Lv,Yin Zhang,Haitao Li,Jie Gao,Wei Wei,Di Zhang,Yongxiang Zhao
The primary products of the direct hydrogenation of Maleic Anhydride (MA) are Succinic Anhydride (SAH) and γ-butyrolactone (GBL). Achieving selective synthesis of these products by regulating the composition, structure, and textural properties remains a focal point in the research field of maleic anhydride hydrogenation. Based on the characteristic of atomic level uniform distribution of cations of layered double hydroxides (LDHs), a highly loaded, highly dispersed and homogenized NiCu alloy bimetallic catalyst was synthesized using NiCuAl-LDHs as precursor. Compared with Ni/Al 2 O 3 catalyst derived from NiAl-LDHs, the introduction of Cu can effectively improve the hydrogenation activity of C=C bonds while inhibiting the hydrogenolysis of C=O bonds. Under identical reaction conditions, the primary product of the Ni/Al 2 O 3 catalyst was γ-butyrolactone (GBL) with a yield of 94.2 %, whereas the primary product of the NiCu 0.4 /Al 2 O 3 catalyst was Succinic Anhydride (SAH) with a yield of 90.5 %. The introduction of Cu resulted in the formation of a homogeneous NiCu alloy phase in the catalyst, which significantly influenced the adsorption configurations and adsorption energies of the reactants and intermediates. This effect can be attributed to the electronic interactions between Ni and Cu, which shift the d-band center of Ni away from the Fermi energy level, thereby facilitating the directed synthesis of Succinic Anhydride (SAH) and γ-butyrolactone (GBL). These findings were confirmed by various characterization techniques and DFT theoretical calculations. Future catalyst development in maleic anhydride hydrogenation will significantly benefit from the design approach and research ideas presented in this study.
研究领域:
催化化学
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材料科学
·
理论计算化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Ning Wu,Hao Guo,Liping Peng,Yuan Chen,Lei Sun,Yinsheng Liu,Xiaoqing Wei,Wu Yang
Creatinine (Cre) measurement in biological fluids is an increasingly important clinical measure for evaluating renal insufficiency, thyroid dysfunction, and muscle injury. Therefore, a simple, fast, and reliable Cre analysis method is of great significance to human health. Herein, a novel ratiometric fluorescence sensor, Ag-Eu-MOF-808-EDTA, was synthesized by introducing ethylenediaminetetraacetic acid (EDTA), Ag + , and Eu 3+ into the framework of MOF-808 through three steps of post-synthesis modification, and was used to detect Cre in PBS buffer of pH 7.2 at 35 °C with a “turn-on” ratio response in the presence of various interfering ions and several biomolecules. In this strategy, the characteristic emission of Eu 3+ at 551 nm can be turned on due to coordination between Cre and Ag + , while emission at 613 nm is independent of Cre, which produces a significant ratio response change throughout the cycle. Experimental results showed that the ratio fluorescence sensor displayed a wide linear range for Cre from 0.5 to 350 μM with a low detection limit of 0.42 μM. Finally, a good recovery rate (96.7–102.9%) and appropriate relative standard deviation (RSD <2.39%, n = 3) were obtained during the determination of creatinine in real urine and serum. This work provides additional insights into the detection of creatinine in clinical blood samples.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Meiying Huang,Lijun Gao,Jiuying Feng,Xuyi Huang,Zengquan Li,Zetian Huang,Lingyun Wang
Poly(propylene carbonate) (PPC) from CO2 and propylene oxide (PO) has wide potential applications as a degradable “plastic”. However, the thermal stability and mechanical properties of PPC cannot meet most of the application requirements. Herein, we focus on improving these properties. A (maleic anhydride/cis-1,2,3,6-tetrahydrophthalic anhydride) (MA/THPA) oligomer containing several cyclocarboxylic anhydride groups, which can copolymerize with PO, has been readily synthesized and used as the third comonomer to prepare PPC with cross-linked networks. The gel contents increase from 16 to 42% with increasing MA/THPA oligomer feed contents from 0.5 to 4 wt % of PO. The formation of cross-linked networks in PPC greatly improves the thermal, mechanical, and dimensional properties. The 5% weight-loss degradation temperature increases from 217 °C to nearly 290 °C before and after cross-linking, which ensures that PPC does not decompose in melt processing. The tensile strength of the copolymer is in the range of 22.2–44.3 MPa with elongation at break of 11–312%. The maximum tensile strength is improved by 143% compared to that of PPC. When the MA/THPA oligomer feed is above 3 wt % of PO, the hot-set elongation of the copolymer at 65 °C decreases more than 10 times when compared with that of PPC, and the permanent deformation is close to 0, while it is 145% for PPC. The dimensional stability is improved sharply. It can overcome the cold flow phenomenon of PPC. The improvement of the above comprehensive properties is of great significance to the practical application of PPC in various fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Xinyue Yao,Yan Xu,Dahua Zhu,Zijun Zhang,Chengqi Feng,Jin Zhu,Chao Fang
A bio-based high-grafting-rate compatibilizer, itaconic anhydride grafted polypropylene (ITA-g-PP), was successfully prepared using 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (L101) as the initiator and assisting by the radical trapping agent α-methyl styrene (AMS). Itaconic anhydride (ITA) was synthetically grafted onto polypropylene (PP) through a dynamic reactive extrusion. The influences of variant contents of ITA and L101 on the grafting reaction were systematically investigated using infrared spectroscopy (IR), acid-base titration, melt flow index, contact angle, differential scanning calorimetry (DSC), mechanical properties and rheological testing methods. The mechanical performances and microstructure of the wheat fiber (WF) enhanced PP composites were investigated. In addition, a series of comparisons were made between ITA-g-PP and self-made maleic anhydride grafted polypropylene (MAH-g-PP) under the same conditions. The results show that the highest grafting rate of ITA-g-PP reached 1.45 %, greatly improving the hydrophilicity of PP. Under the same conditions, ITA-g-PP grafting rate can reach 1.2 %, and self-made MAH-g-PP grafted rate was only 0.75 %. The prepared ITA-g-PP can significantly enhance the adhesion of interfacial between WF and PP compared with traditional MAH grafted PP, thereby improving impact and tensile properties. Among them, adding ITA-g-PP to WF/PP composites can increase the impact strength by up to 29 %, while adding MAH-g-PP can only increase it by 17 % in WF/PP composites.
研究领域:
材料科学
·
高分子化学
✓ 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）