NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xiude Peng,Xiaohua Cao,Huaiyu Xu,Ruibin Xiong,Dedong He,Dingkai Chen,Yongming Luo
CO2-ODHP has been demonstrated to be an effective technology for the production of propylene. CO2 acts as a soft oxidizer that reduces over-oxidation of hydrocarbons and improves propylene selectivity. However, CO2-ODHP still faces the challenge of rapid catalyst deactivation due to coke accumulation at elevated operating temperatures. Herein, we prepared a La-modified Ga/ZSM-5 catalyst, in which La modified the acidic–basic properties of Ga/ZSM-5 and improved the resistance to coke accumulation of the catalyst. The synthesized Ga2La1/ZSM-5 catalyst achieved propane conversion up to 80% at 580 °C. In situ DRIFTS analysis revealed that the addition of La could significantly accelerate the formation of HCOO* intermediates, which further improved the efficiency of the CO2-ODHP reaction.
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Qian Zhang,Jun Li,Tian-Jiao Yue,Na Li,Yu-Qin Jiang,Hai-Ming Guo
Four hyper-cross-linked polymers were synthesized by linking electron-rich monomers with an electron-rich cross-linker via the Friedel–Crafts reaction. Among these polymers, P4 , which was constructed with decaalkyne pillar[5]arene and bibenzyl chloride, adsorbed iodine vapor with a capacity of 3.930 g g −1 , outperforming most supramolecular macrocycle-based porous polymers . The pillar[5]arene macrocycle contributed various types of adsorption sites, including aromatic rings , diynes, and oxygen atoms. The abundance of effective adsorption sites and the high specific surface area (1615.5 m 2 g −1 ) were responsible for the excellent adsorption capacity of P4 . Because these polymers are easy to synthesize and regenerate and can be mass produced, they are promising candidates for large-scale applications.
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DOI
高影响因子
Microbiome
·
2025
·Vol. 13
·期 1
·1-21
·
IF 12.7
Zhu Liuying,Zhang Zhiyi,Luo Ting,Li Hongyan,Deng Zeyuan,Li Jing,Zheng Liufeng,Liao Jinqiang,Wang Minghui,Zhang Bing
Background 2′-Fucosyllactose (2′-FL) is one of the major oligosaccharides found in human breast milk, with several recognized beneficial effects on the host. Extensive research has indicated positive effects of 2′-FL on cognitive development in the brain, yet its molecular mechanisms have remained elusive. This study aimed to assess the impact of 2′-FL on the gut-brain axis microbiota and cognitive function in growing mice, along with its potential mechanisms of action.
Results Following long-term supplementation for 4 weeks, 2′-FL was found to enhance cognitive memory function in growing mice (3 weeks old) as assessed through Y-maze, novel object recognition, and water maze tests. Analysis via 16S rRNA sequencing revealed significant alterations in gut microbiota diversity and composition induced by 2′-FL, notably increasing the relative abundance of Bacteroides and Lactobacillus genera. Additionally, 2′-FL significantly elevated levels of 5-hydroxytryptamine (5-HT) and 5-hydroxytryptophan (5-HTP) in the hippocampal tissue. However, antibiotic intervention abolished the cognitive advantage conferred by 2′-FL, highlighting the critical role of gut microbiota in mediating its effects. Similarly, short-term supplementation with 2′-FL for 7 days indicated rapid changes in gut microbiota composition preceding cognitive improvements, further suggesting a potential causal relationship between gut microbiota characteristics and cognition. Further, in vitro experiments with mouse feces suggested that 2′-FL may influence tryptophan hydroxylase levels in the gut microbiota and inhibit the activity of 5-hydroxytryptophan decarboxylase, potentially leading to increased accumulation of 5-HTP. Additionally, 2′-FL may indirectly impact tryptophan hydroxylase levels in enterochromaffin cells by promoting short-chain fatty acid production, which could support 5-HTP synthesis. Elevated 5-HTP produced by the gut system enters the bloodstream, crosses the blood–brain barrier, and may potentially enhance brain 5-HT levels.
Conclusion This study offers preliminary evidence that the cognitive-promoting effects of 2′-FL in mice may be closely associated with gut microbiota and 5-HT. The findings suggest that 2′-FL contribute to cognitive development in growing mice, potentially by modulating gut microbiota and enhancing 5-HT levels in the brain.
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DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2020
·
IF 8.208
Qiuhao Wu,Yunpu Wang,Yujie Peng,Linyao Ke,Qi Yang,Lin Jiang,Leilei Dai,Yuhuan Liu,Roger Ruan,Donghua Xia,Li Jiang
Microwave-assisted pyrolysis of waste cooking oil is an environmentally friendly and economical method for obtaining benzene, toluene, ethylbenzene, and xylene (BTEX) which are important industrial chemicals. This study provides new routes to produce of BTEX and the utilization of waste cooking oil. The effect of catalytic temperatures (350 °C, 400 °C, 450 °C, 500 °C, and 550 °C), types of metal oxide (CoO, NiO, ZrO 2 , SrO, CeO 2 , and CaO), catalytic modes (ex-situ mixed catalysis, ex-situ separate catalysis, and in-situ separate catalysis), and ratio of HZSM-5 to metal oxide (HZSM-5 only, 4:1, 2:1, 1:1, 1:2, and CaO only) were studied. Results showed high catalytic temperature promoted the formation of monocyclic aromatic hydrocarbons at the cost of a decrease in bio-oil yield. But the concentration of BTEXS (benzene, toluene, ethylbenzene, xylene, and styrene) only increased from 256.58 mg/ml to 259.55 mg/ml with a temperature increase from 500 °C to 550 °C. Alkaline earth metal oxides (CaO, SrO) showed a significant deoxygenation capability during co-catalysis with HZSM-5. However, when CaO was applied under ex-situ mixed catalysis, the concentration of polycyclic aromatic hydrocarbons was up to 35.47%, which was much higher than 9.18% under HZSM-5 only. Also, the concentration of BTEXS decreased from 256.58 mg/ml (HZSM-5 only) to 167.54 mg/ml (HZSM-5 mixed with CaO). Further investigation of catalytic mode showed that ex-situ separate catalysis was more suitable for co-catalysis of alkaline earth metal oxides and HZSM-5. The concentration of BTEXS were both significantly higher than that of HZSM-5 only, which increased by 121.81 mg/ml for CaO and 108.52 mg/ml for SrO under ex-situ separate catalysis. Further study showed that the highest concentration of BTEXS was 702.20 mg/ml obtained when the ratio of HZSM-5 to CaO was 2:1. It was almost 2.8 times higher than HZSM-5 alone and 42.2 times higher than non-catalytic results.
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2020
·
IF 3.905
Chaoyue Shen,Xiying Jia,Yifei Chen,Licong Lu,Fangqi Wang,Yi Wei,Fengwen Yu
Molten carbonate pyrolysis is proposed to convert digestate (DE) into biobased monophenols coupled with a metal-modified HZSM-5 catalyst. The results indicated that Fe/HZSM-5 was the most suitable catalyst for this process. The optimum reaction conditions for the process were WHSV = 15 h −1 at a pyrolysis temperature of 430 °C and a catalytic cracking temperature of 475 °C, and 79.22 % of monophenol components were achieved in the bio-oil. A kinetic study on the digestate with carbonates indicated that the alkali metal ion in the molten carbonates attached to the β-O-4 bonds and branch methoxy group of lignin, which promoted the removal of these functional groups, resulting in a reduction in the activation energy during monophenol generation. The Fe/HZSM-5 catalyst reinforced the generation of monophenol compounds in both concentration and yield. Compared with molten carbonate pyrolysis, the Fe on the catalyst not only benefited the breaking of β-O-4 bonds and methoxy groups of lignin but also lowered the temperature during molten carbonate pyrolysis to minimize the secondary cracking of phenolic compounds.
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高影响因子
FUEL
·
2022
·
IF 8.035
Runze Jin,Ke Ma,Zhongshun Chen,Zhongqiang Tang,Haobin Hu,Jiaofei Wang,Zhuangzhuang Zhang,Chengyi Dai,Xiaoxun Ma
The selectivity of methanol conversion to aromatics on Zn/ZSM-5 is often limited, mainly because the hydrogen removed during the process combines with low-carbon olefin intermediates to regenerate alkanes and reduce the effective utilization of carbon atoms. Herein, CO 2 is added to the methanol aromatization reaction as a receptor that consumes hydrogen in situ, which reduces the hydrogen transfer reaction and improves the selectivity of aromatics. It is proposed that aromatic selectivity under CO 2 atmosphere is determined by the chemical state of Zn species. Specifically, ZnO converts CO 2 and consumes hydrogen, and ZnOH + promotes methanol aromatization. Under the same conditions, aromatic selectivity of 3ZnZ18-IM under CO 2 atmosphere can reach 85.2 %, which is much higher than that of 71.4 % under N 2 atmosphere. This study provides a new strategy for methanol to aromatics (MTA) reaction, which has a positive impact on solving the energy and environmental problems in the production of aromatics.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Tianyu Bai,Jinquan Tao,Yijing Jia,Wenbin Huang,Rongpeng Yao,Xinan Xue,Yasong Zhou,Qiang Wei
In the research of directly synthesizing H-form ZSM-5, ammonium hydroxide is commonly used as an alkali source instead of NaOH to avoid multiple ion exchange steps. However, the volatile nature and the lack of structure-directing effect of ammonium hydroxide limit its application in practical. In this study, n -butylamine (NBA) was used as the main alkali source to directly prepare HZSM-5 zeolites with SiO 2 /Al 2 O 3 ratios ranging from 40 to 300 under traditional hydrothermal conditions. The influence of the amount of NBA, ethanol, seed, and pre-crystallization on the synthesis products was investigated under the condition of SiO 2 /Al 2 O 3 = 80. Theoretical simulation suggested that n -butylamine cations (NBA + ) play the most potent directing role in the formation of the MFI structure but could lead to difficulties in removal during calcination. The addition of ethanol as the zeolite growth modifier (ZGM) could decrease the usage of NBA and reduce the difficulties in calcination, and the addition of seed provided the conditions for initiating crystallization in the system that could not spontaneously nucleate. HZSM-5 with different SiO 2 /Al 2 O 3 ratios were prepared under the optimal crystallization conditions, and the as-synthesized samples exhibited superior textural and acid properties compared to commercial zeolite. Finally, the 1 L scale-up synthesis and MTP reaction were conducted to demonstrate the practicality of this economically and environmentally-friendly synthesis strategy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Fei Wang,Jing Ren,Yunliang Cai,Long Sun,Chuanling Chen,Shuai Liang,Xingmao Jiang
High dispersed palladium nanoparticles with the size of about 3.8 nm confined within ZSM-5 zeolite catalyst (Pd/ZSM-5-IS) was successfully synthesized by in situ synthesis method based on azeotropic distillation assisted fabrication. Liquid phase selective hydrogenation of p -nitrophenol (PNP) to p -aminophenol (PAP) was chosen as model reactions to evaluate the catalytic behavior of the Pd/ZSM-5 catalysts. Thiophene and 4,6-dimethyldibenzothiophene were used as poisons to test their anti-poisoning ability. Pd/ZSM-5-IS catalyst exhibited higher catalytic activity in hydrogenation of PNP to PAP than sample prepared by impregnation method (Pd/ZSM-5-IM), which was mainly attributed to entering of Pd nanoparticles into the intracrystalline mesovoids of the ZSM-5 support for in situ method efficiently prevent active sites from loss and aggregation. In addition, Pd/ZSM-5-IS catalyst not only maintained high activity for five consecutive runs, but also showed high sulfur tolerance for the hydrogenation reactions. This simple and versatile method also can be extended to cover many kinds of other supported catalysts for broad applications in many other catalytic reactions in the future.
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高影响因子
ChemCatChem
·
2013
·Vol. 5
·期 6
·1517-1523
·
IF 5.181
Yan Liu,Xiaozhao Zhou,Xinmei Pang,Yinying Jin,Xiangju Meng,Xiaoming Zheng,Xionghou Gao,Feng-Shou Xiao
Graphical Join the chain gang: Chain-like ZSM-5 crystals that are synthesized in the presence of starch show higher p -xylene selectivity in m -xylene isomerization than normal, mesoporous, and sheet-like ZSM-5 crystals. ZSM-5 zeolite crystals with controllable b- axis length (sheet-like, S-ZSM-5; chain-like, C-ZSM-5) have been synthesized by using urea and starch as additives in the starting aluminosilicate gels. X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images show that these zeolite samples have good crystallinity. Transmission electron microscopy (TEM) images show that there is a strong chemical interaction between the stacked crystals in C-ZSM-5 samples. N 2 sorption isotherms indicate that C-ZSM-5 crystals are mesoporous. Catalytic tests for the formation of p -xylene from m- xylene isomerization show that, compared with other zeolite catalysts, C-ZSM-5 catalysts give both high conversion and improved p -xylene selectivity, which are attributed to the combination of relatively long b -axis length and the present mesoporosity in the crystals. The improvement of p -xylene selectivity in catalytic m- xylene isomerisation is of great importance for selective industrial production of p -xylene in the future.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jinghua Wang,Hongyou Cui,Jiangang Wang,Zhihe Li,Ming Wang,Weiming Yi
Conversion of glucose to 5-hydromethyl furfural (HMF) and levulinic acid (LA) was systematically investigated in LiCl·3H 2 O without additional catalyst. Based on the experimental investigations by using glucose, fructose and HMF as the reaction substrate separately, corresponding reaction kinetics in LiCl·3H 2 O were modelled by first-order assumption. Kinetic analysis demonstrates that high temperature favors the formation of LA, while low temperature facilitates to selectively form humins. To achieve high LA yield, at least a temperature of 140 °C is required. Without additional catalyst converting glucose to LA in LiCl·3H 2 O, humins was predominantly derived from glucose and HMF, and glucose isomerization is the reaction rate-determining step. The activation energies of the main reactions are 160.96 kJ/mol (glucose to HMF), 139.20 kJ/mol (fructose to HMF), and 71.81–76.48 kJ/mol (HMF to LA) respectively. The activation energies for humins formation were 23.45 kJ/mol from glucose, 49.54 kJ/mol from fructose, and 42.15–65.85 kJ/mol from HMF, respectively. It is verified that LiCl·3H 2 O, as compared to aqueous medium, is an excellent reaction medium for converting glucose to LA as it can provide the active centers for fructose to HMF reaction and HMF to LA reaction, but lack of highly efficient Lewis acid for glucose isomerization. With the addition of Lewis acid (such as AlCl 3 and FeCl 3 ), as high as 83.4% of LA yield can be obtained respectively when directly converting glucose, with the total selectivities of LA and HMF of 95%.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Wenpeng Han,Mingxing Tang,Jinlong Li,Xuekuan Li,Junwei Wang,Ligong Zhou,Ying Yang,Yuqi Wang,Hui Ge
The efficient transformation of biomass resources to biofuels has attracted much attention. Herein, ordered mesoporous alumina supported nickel-molybdenum sulfide catalysts (denoted as Ni-MoS 2 /mAl 2 O 3 ) were prepared by evaporation-induced self-assembly (EISA) method and used for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Under mild conditions (130 °C, 1 MPa H 2 ), the 5Ni-7MoS 2 /mAl 2 O 3 catalyst achieved 95 % yield of DMF. The results of characterizations and DFT calculation showed that the active center was proposed to the coordinated unsaturated site (CUS) located at S-edge. And the intrinsic activity of CUS was directly related to the proportion of Mo substituted by Ni. The 5Ni-7MoS 2 /mAl 2 O 3 catalyst containing CUS with high proportions of Ni replacing Mo showed higher TOF and lower apparent activated energy. Besides, 2-propanol can cooperate with molecular hydrogen to improve DMF yield by forming ethers that were easier to be hydrogenolyzed. The present findings provided a new catalytic system for converting HMF to DMF.
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DOI
高影响因子
FOOD CHEMISTRY
·
2015
·
IF 3.391
Zhenhua Zhang,Yueyu Zou,Taigang Wu,Caihuan Huang,Kehan Pei,Guangwen Zhang,Xiaohua Lin,Weibin Bai,Shiyi Ou
Chlorogenic acid (CGA) is a phenolic acid that ubiquitously exists in fruits. This work aims to investigate whether and how CGA influences HMF formation during heating fructose alone, or with an amino acid. The results showed that that CGA increased 5-hydroxymethylfurfural (HMF) formation. At pH 5.5 and 7.0, the addition of 5.0 μmol/ml CGA increased HMF formation by 49.4% and 25.2%, respectively when heating fructose alone, and by 9.0% and 16.7%, respectively when heating fructose with aspartic acid. CGA significantly increased HMF formation by promoting 3-deoxosone formation, and its conversion to HMF by inhibiting HMF elimination, especially in the Maillard reaction system. A comparison of the catalytic capacity of CGA with its six analogous compounds showed that both its di-hydroxyphenyl and carboxyl groups function in increasing HMF formation.
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高影响因子
危险品化学品经营许可证（带存储）