CATALYSIS TODAY
·
2022
·
IF 6.562
Bin Kang,Ming Li,Zhaoying Di,Xiaonan Guo,Ying Wei,Jingbo Jia,Runduo Zhang
Series of ZSM-5 zeolites with diverse contents and locations of Al pairs were synthesized, and Co 2+ ions were subsequently anchored at the Al pairs of ZSM-5 zeolites by wet ion-exchange with H protons. The Co-ZSM-5 sample derived from the mixtures of AlCl 3 and TEOS of Si/Al=30.3 showed the best de N 2 O performance. Analysis on Co (Ⅱ) ion exchange capacity demonstrated the content of Al pairs followed the sequence: AlCl 3 (0.84) > Al(NO 3 ) 3 (0.73) > aluminum isopropoxide (0.65) and TEOS (0.84) > silicic acid (0.57). More Al pairs coordinated with protons or cobalt ions were essentially associated with better performances for N 2 O catalytic dissociation. Moreover, Si source had a significant effect on the location of Al pairs determined by UV–vis–DRS of bare Co (Ⅱ), Al pairs of ZSM-5 zeolite synthesized from TEOS were enriched in the sinusoidal channel (γ site), whereas those synthesized from silicic acid were concentrated in the channel intersections (6-MRs β site). The theoretical calculation revealed that the O 2 desorption at γ-site Co 2+ of ZSM-5 zeolite required to overcome less energy barrier (23.8 kcal/mol) than that at β-site one.
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JOURNAL OF POROUS MATERIALS
·
2026
·
IF 3.2
Guo Hanxu,Fu Sen,Yuan Hong
Hierarchical zeolites can provide multidimensional spatial networks, thereby holding significant potential as catalysts for BTX production from biomass pyrolysis. In this study, nano-ZSM-5 zeolite (Z X-X ) with a hierarchical pore structure was synthesized using glycine as a growth inhibitor. Due to the exceptional ability of Ni to cleave C–C and C–H bonds, Ni modification was performed on the Z 30-0.2 catalyst. The effects of glycine and Ni loading on the morphology and pore structure of the zeolites were systematically investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption–desorption. The results demonstrated that the particle size of 10 wt% Ni-Z 30-0.2 zeolite ranged from 200 to 300 nm, with a BET surface area of 314 m 2 /g and abundant mesopores. The NH 3 -TPD results showed that the acid amount of 10 wt% Ni-Z 30-0.2 was 0.72 mmol/g. The prepared zeolite was employed in a fixed-bed reactor to catalyze the pyrolysis of oleic acid for the production of benzene, toluene, and xylene (BTX). The introduction of metal Ni significantly enhanced the BTX yield. At 500 ℃, the average BTX yield achieved with the 10 wt% Ni-Z 30-0.2 catalyst was 19.4 wt%, which was higher than that of the zeolite without Ni loading.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Leqing He,Changyue Shao,Ping Liu,Yingxia Li,Jiqin Zhu,Chongpin Huang
Conventional ZSM-5 zeolites face significant challenges in achieving high product selectivity and avoiding rapid catalyst deactivation due to coke deposition during the condensation of ethylenediamine (EDA) to triethylenediamine (TEDA). Based on the characteristic of ammonia generation during the synthesis of TEDA from EDA, this study treats ZSM-5 with high-temperature ammonia-steam to investigate its effect on the catalytic synthesis of TEDA. The results show that ZSM-5 sample treated with 5 wt% ammonia-steam at 600 ℃ exhibited higher crystallinity and more mesoporous structure. A large amount of framework aluminum in the catalyst was removed, resulting in significant decrease of acid strength and a high L/B ratio. The modified catalyst achieved complete EDA conversion during the reaction, with 64% TEDA selectivity—a 17% improvement over that of unmodified catalyst. It also exhibited a significant reduction in coke deposition from 6% to 2.3% and a 15-days continuous fixed-bed reaction test confirmed the high stability of the modified catalyst without noticeable deactivation. Compared to acid-base treated and metal ion treated ZSM-5, ammonia-steam treated ZSM-5 demonstrates superior selectivity and stability, and it has been verified that the TEDA yield is higher than that of TS-1. This study provides a novel strategy for designing efficient catalysts for amine cyclization reactions.
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Catalysts
·
2026
·Vol. 16
·期 3
·264
·
IF 4.5
Chenfeng Li,Jiahao Ju,Beizhan Li,Jilei Xu,Xin Su,Zuoyi Xiao,Qingda An,Jiahui Huang
5-Methoxymethyl-2-furfural (MMF) serves as a crucial biobased platform molecule that can be transformed into various high-value chemicals and biobased polyester monomers. However, the current production of MMF still faces several challenges, such as low yield and prolonged reaction time. In this study, we prepared a series of amide-modified strongly acidic resin catalysts and discovered that they have a higher efficiency in converting fructose to prepare MMF in 1-Butyl-3-methylimidazolium chloride ([BMIM]Cl) and methanol. Among the synthesized catalysts, DB757-NMP demonstrated superior performance, achieving an MMF yield of approximately 61.5% under the optimized conditions, with a combined yield of HMF and MMF reaching about 66.6%. The catalyst formation mechanism was analyzed using FTIR, and NMR, confirming the transformation of proton between NMP and the sulfonic acid groups of the resin, which collectively promoted the conversion of fructose to MMF. In addition, we investigated main reasons for catalyst deactivation and successfully restored catalytic activity through regeneration. The regenerated catalyst could be reused for three times with only a slight decrease in MMF yield. The results suggested that DB757-NMP is a more sufficient and recyclable catalyst for the production of MMF from fructose. This work presented a simple and environmentally benign approach for the synthesis of MMF.
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Molecular Catalysis
·
2026
·
IF 4.3
Shuo Yan,Qing-Xu Fan,Fen-Lian Wang,Yu-Ji Gao,Ling-Bao Xing
Solid-solution Zn 0.2 Cd 0.8 S QDs balance redox ability, band alignment, and stability. • The QDs affords 95.4% HMF conversion and 70.1% DFF yield under visible light. • Synergisticeffects of h + , •O 2 − , and 1 O 2 drive highly selective HMF oxidation to DFF. The selective photocatalytic oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) into high-value platform chemicals represents a promising pathway toward achieving carbon neutrality and sustainable development. To overcome the limited visible-light response and severe photocorrosion of monometallic sulfide quantum dots (QDs), solid-solution ZnCdS QDs were fabricated, enabling efficient photocatalytic oxidation of HMF to high-value 2,5-Diformylfuran (DFF). Systematic characterizations reveal that the ternary ZnCdS QDs achieve an ideal balance between robust redox capability and favorable band alignment, alongside remarkable structural stability and sustainable recyclability. Under optimal conditions, the Zn 0.2 Cd 0.8 S QDs achieved 95.4 ± 0.3% HMF conversion and 70.1 ± 0.9% DFF yield. The reaction mechanism was elucidated via radical trapping experiments and electron paramagnetic resonance (EPR) measurements, demonstrating that reactive species, including h + , •O 2 − , and 1 O 2 synergistically promoted the high-value conversion of HMF to DFF. Download: Download high-res image (196KB) Download: Download full-size image
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Microbial Biotechnology
·
2025
·Vol. 18
·期 11
·e70257
·
IF 5.2
Hui Chen,Fengjiao Wang,Shengjie Li,Longxian Lv,Hao Xu,Jiafeng Xia,Lvwan Xu,Ding Shi,Lanjuan Li
Pediococcus pentosaceus Li05, a strain of lactic acid bacteria isolated from the faeces of healthy volunteers, exhibited potential protective effects against various diseases. This study performed third-generation sequencing and detailed characterisation of its genome. The Li05 chromosome harboured conserved genes associated with acid resistance ( atp ), bile salt resistance ( bsh ), oxidative stress resistance ( hsl , dltA , and et al.), and adhesion ( nrd , gap , and et al.), whereas the plasmid did not contain antibiotic resistance or virulence genes. Following intervention with Li05 in loperamide-induced constipated mice, constipation symptoms improved. Meanwhile, alterations in gut microbiota, increased BSH activity in faeces, and modifications to the faecal bile acid profile were observed. Additionally, expression levels of TGR5 and TPH1 in the colon of the mice increased, leading to elevated 5-HT levels. When the TGR5 gene was knocked out or the TPH1 inhibitor LX1606 was administered to suppress 5-HT synthesis in constipated mice, the beneficial effects of Li05 on gastrointestinal motility and mucus secretion were reversed. Culturing intestinal organoids demonstrated that increased bile acids such as DCA, Iso-LCA, and EALCA could enhance 5-HT levels through the TGR5/TPH1 axis. Therefore, we concluded that Li05 regulated bile acid metabolism, subsequently increasing 5-HT levels through the TGR5/TPH1 axis, thus alleviating constipation. Graphical The mechanism of Li05 in alleviating constipation. Li05 intervention regulated gut microbiota and bile acid metabolism, increasing 5-HT levels through the TGR5/TPH1 activation to ameliorate constipation.
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PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Hongfang Wang,Leitao Xu,Jingcheng Wu,Peng Zhou,Shasha Tao,Yuxuan Lu,Xianwen Wu,Shuangyin Wang,Yuqin Zou
5-Hydroxymethylfurfural (HMF) electrooxidation in neutral conditions is a promising strategy to suppress the formation of humins and corrosive effects on electrochemical devices. However, scarce studies have been reported in neutral media due to the deficiency in electrophilic oxygen (eg OH – ) required for the activation of HMF. Herein, 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO)/Co 3 O 4 was utilized to co-catalyze HMF in neutral media, successfully achieving 2,5-furandicarboxylic acid (FDCA) with yield > 99%. It was found that TEMPO could promote HMF dehydrogenation to 2,5-diformylfuran (DFF) and simultaneously activated water via hydrogen-bonding interactions. As a result, the formation of OH* in neutral electrolytes was favored, which was absorbed by electrogenerated active Co species to facilitate subsequent conversion of formyl-group-involved intermediates to FDCA. This work provides a current understanding of the catalytic mechanism for HMFOR in neutral media and guides the design of highly efficient electrocatalysts for biomass upgrading.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qiang Sun,Hongxia Gao,Teerawat Sema,Zhiwu Liang
High energy consumption during the carbon dioxide (CO 2 ) desorption process in amine-based CO 2 capture technology is a crucial hindrance to achieving carbon neutrality. HZSM-5 is one of the most widely reported solid acid catalysts used in primary amine regeneration. This work compared a series of HZSM-5 zeolites with different Si/Al ratios in terms of CO 2 desorption performance. To further enhance catalytic activity, hierarchical HZSM-5 was synthesized by the dealumination and desilication re-assembly method with different acid and alkali concentrations. The experimental results suggested that desilication by modification in sodium hydroxide resulted in a significant improvement of mesoporous surface area. The NaOH-0.4 catalyst could improve the amount of desorbed CO 2 by 40.3% and decrease the relative heat duty by 28.5%. And the cyclic tests revealed that catalytic activity was well preserved in the recycling process. Moreover, the structure and acidity of modification samples were characterized by X-Ray diffraction (XRD), Fourier transforms infrared (FT-IR), Nitrogen adsorption–desorption experiment, temperature programmed desorption of ammonia (NH 3 -TPD), Pyridine-adsorption infrared spectroscopy (Py-IR), and scanning electron microscopy (SEM). The characterization results suggested that the synergistic effect of larger mesoporous surface area and total acid sites was important to enhance catalytic CO 2 desorption performance. These results showed a new understanding of catalyst design for CO 2 capture technology by modifying the structure of the catalyst support.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fei Wang,Li Li,Chaohui Yang,Zhongxing Cai,Ziyi Guo,Siyu Hou,Xiaoya Xie,Yinghao Chen,Jing Huang,Long Zhang
A series of GdPO 4 :5%Eu 3+ micro/nanomaterials with different morphologies and crystal structures were successfully prepared by the one-step solvothermal method using only the gadolinium source, the phosphoric acid source and ethanol as solvents, without any surfactants or templates, without further calcination and by adjusting only the ratio of phosphoric acid and gadolinium sources. They all have good dispersion and homogeneity. The morphology of the products was mainly regulated by the ratio of H 3 PO 4 to Gd(NO 3 ) 3 · 6H 2 O, with ratios of 2:1, 8:1, 16:1, 24:1, 32:1, 40:1 and 48:1 mL/g resulting in the formation of square, pillow, star, carambola, hollow cylinder, drum and jujube shaped GdPO 4 :5%Eu 3+ micro/nanomaterials, respectively. Ratios of 2:1–24:1 and 32:1–48:1 allow for the direct solvothermal synthesis of monoclinic and hexagonal phase gadolinium phosphate, simultaneously. In addition to their crystal structure and morphology, chemical bonding, thermal stability and specific surface area, their luminescence properties and magnetic resonance imaging (MRI) tracing properties have also been studied in comparison. Interestingly, the GdPO 4 :5%Eu 3+ micro/nanoparticles in the carambola shape had a higher photoluminescence intensity and relaxation rate of 0.7709 mM −1 s −1 (r 1 ) among all the morphologies. The possible mechanisms by which various morphologies of GdPO 4 :5%Eu 3+ were prepared in different ratios were analyzed, and the reasons for their effects on the fluorescence and MRI tracer properties were further investigated. This study is of reference significance for the simple-regulated synthesis of rare earth inorganic gadolinium-containing micro/nanomaterials and provides a reliable guarantee for the expansion of their multifunctional applications in UV–Vis luminescence and MRI tracing for implants.
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NEURON
·
2023
·
IF 16.2
Jianzhi Zeng,Xuelin Li,Renzimo Zhang,Mingyue Lv,Yipan Wang,Ke Tan,Xiju Xia,Jinxia Wan,Miao Jing,Xiuning Zhang,Yu Li,Yang Yang,Liang Wang,Jun Chu,Yan Li,Yulong Li
Summary The coincidence between conditioned stimulus (CS) and unconditioned stimulus (US) is essential for associative learning; however, the mechanism regulating the duration of this temporal window remains unclear. Here, we found that serotonin (5-HT) bi-directionally regulates the coincidence time window of olfactory learning in Drosophila and affects synaptic plasticity of Kenyon cells (KCs) in the mushroom body (MB). Utilizing GPCR-activation-based (GRAB) neurotransmitter sensors, we found that KC-released acetylcholine (ACh) activates a serotonergic dorsal paired medial (DPM) neuron, which in turn provides inhibitory feedback to KCs. Physiological stimuli induce spatially heterogeneous 5-HT signals, which proportionally gate the intrinsic coincidence time windows of different MB compartments. Artificially reducing or increasing the DPM neuron-released 5-HT shortens or prolongs the coincidence window, respectively. In a sequential trace conditioning paradigm, this serotonergic neuromodulation helps to bridge the CS-US temporal gap. Altogether, we report a model circuitry for perceiving the temporal coincidence and determining the causal relationship between environmental events.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Liu Gui,Liu Pengfei,Meng Deming,Zhao Taotao,Qian Xiaofeng,He Qiang,Guo Xuefeng,Qi Jizhen,Peng Luming,Xue Nianhua,Zhu Yan,Ma Jingyuan,Wang Qiang,Liu Xi,Chen Liwei,Ding Weiping
The hydrogenation of CO 2 or CO to single organic product has received widespread attentions. Here we show a highly efficient and selective catalyst, Mo 3 S 4 @ions-ZSM-5, with molybdenum sulfide clusters ([Mo 3 S 4 ] n+ ) confined in zeolitic cages of ZSM-5 molecular sieve for the reactions. Using continuous fixed bed reactor, for CO 2 hydrogenation to methanol, the catalyst Mo 3 S 4 @NaZSM-5 shows methanol selectivity larger than 98% at 10.2% of carbon dioxide conversion at 180 °C and maintains the catalytic performance without any degeneration during continuous reaction of 1000 h. For CO hydrogenation, the catalyst Mo 3 S 4 @HZSM-5 exhibits a selectivity to C 2 and C 3 hydrocarbons stably larger than 98% in organics at 260 °C. The structure of the catalysts and the mechanism of CO x hydrogenation over the catalysts are fully characterized experimentally and theorectically. Based on the results, we envision that the Mo 3 S 4 @ions-ZSM-5 catalysts display the importance of active clusters surrounded by permeable materials as mesocatalysts for discovery of new reactions.
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MATERIALS LETTERS
·
2023
·
IF 3
Yuanyuan Tao,Wenhui Wei,Qianqian Gu,Xiaoping Jiang,Dongwei Li
The desilicated zeolite ZSM-5 (des-ZSM-5) based composite polymer electrolytes (CPEs) PZEw was fabricated via phase inversion processes and in-situ polymerization with polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and liquid electrolyte 1 M lithium bis(trifluoromethanesulphonyl)imide (LiTFSI) in vinylene carbonate (VC) (VC@LiTFSI). Assisted by des-ZSM-5, PZEw possess excellent thermal stability, mechanical properties, high ionic conductivity (2.75 × 10 −4 S cm −1 , 25 °C), and enlarged electrochemical windows (4.94 v, vs. Li + /Li). Meanwhile lithium metal batteries (LMBs) LiFePO 4 (LFP)/PZEw/Li showed superior rate performance and long-time cycling stability.
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危险品化学品经营许可证（带存储）