Journal of Energy Chemistry
·
2015
·
IF 2.352
Chaoqun Bian,Qinming Wu,Jian Zhang,Shuxiang Pan,Liang Wang,Xiangju Meng,Feng-Shou Xiao
In the interlayer expansion of the layered zeolite precursor COK-5, a Sn, salt, bis(2,4-pentanedionate)-dichlorotin [Sn(acac) 2 Cl 2 ], instead of a silylating agent was used to link the layers at 180 °C. The obtained material, which is designed as Sn-COE-5, shows a shift of the first XRD reflection, which is very similar to that of COK-5 interlayer expanded with dichlorodimethylsilane (DCDMS), indicating an increase in interlayer distance . X-ray diffraction (XRD), N 2 sorption isotherms, inductively coupled plasma (ICP), and X-ray photoelectron spectroscopy (XPS) support the incorporation of isolated Sn sites in the sample. In the conversion of glucose to levulinic acid, Sn-COE-5 exhibits much higher activity than COK-5, which is due to the presence of Lewis acidic sites in the Sn-COE-5.
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Canadian Journal of Chemistry
·
2022
·Vol. 100
·期 8
·
IF 1.051
Changshuai Liu,Rong Zhang,Rujing Pei,Chao Zhang,Fuxiang Li
A new strategy was implemented to synthesize hierarchical ZSM-5 zeolite, which uses self-made organosilanized double-terminal amino polyetheramine (ODAP) as a soft template to generate mesopores. The influence of the additional amount of ODAP on the textural properties and morphologies of the hierarchical ZSM-5 zeolite was investigated. The obtained hierarchical ZSM-5 zeolite was characterized by X-ray diffraction, N2 physical adsorption, SEM, temperature-programmed desorption of NH3, and other methods. The analysis of the experimental results shows that the maximum total BET specific surface area and mesoporous specific surface area of the optimized hierarchical ZSM-5 zeolite reached 609 and 278 m2/g, respectively. Because the synthesized hierarchical ZSM-5 zeolite has a large mesoporous specific surface area and abundant surface acidity, in terms of reactant conversion and product selectivity, compared with microporous zeolite, it exhibits excellent catalytic performance in the thiophene alkylation desulfurization reaction. This synthesis strategy can be extended to the preparation of zeolites with different framework structures, which is of great significance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Xiangyang Yuan,Yinmin Cai,Lixi Chen,Shihang Lu,Xin Xiao,Lihua Yuan,Wen Feng
As pre-organized multidentate extractants, phosphine oxides functionalized pillar[5]arenes (POP5As) have showed superior efficiency for uranyl extraction. In this work, the effect of type of organic diluents including dichloromethane (DCM), 1,2-dichloroethane (DCE), 1-nitro-3-(trifluoromethyl)benzene (NTFB) and nitropropane (NP) with different polarity and the fundamental thermodynamic behaviour were investigated in the solvent extraction of uranyl by POP5As from nitric acid (1 M) solution. The extraction ability pertaining to spacer length ( C n H 2n , n = 2, 4, 6), diluent polarity and temperature has been evaluated by comparing the distribution coefficients. The extractant with longer spacer exhibited a better performance in all diluents examined. Particularly, influencing factors including structural variation of ligands and property of organic diluents for the extraction efficiency were discussed from the thermodynamic point of view (Δ H , Δ S and Δ G ). Generally, the extraction processes of uranyl by POP5As were exothermic and spontaneous in nature. In the case of DCE , NTFB and NP, Δ H < 0 and Δ S < 0, the extraction process of uranyl is enthalpy driven whereas the entropy factor counteracts it. In DCM , Δ H < 0 and Δ S > 0, the extraction is synergistically driven by enthalpy and entropy.
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SCRIPTA MATERIALIA
·
2013
·Vol. 69
·期 8
·574-577
·
IF 2.821
Limeng Liu,Lianbing Zhong,Baoyou Zhang,Zhonghong Lai,Feng Ye,Zhiguo Zhang,Yu Zhou
The effects of the addition of 5 mol.% aluminum , copper, silver or gold on the densification , microstructures, mechanical properties and oxidation resistance in thin air of TaC ceramics were investigated. Full density and relatively high flexural strength (up to 738 MPa) were observed in the case of the Au addition after spark plasma sintering at 1700 °C for 5 min under 30 MPa pressure. Due to wetting of the TaC grains by a thin metallic film , the consolidated materials showed enhanced oxidation resistance against thin air.
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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
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Siwei Yan,Kezhen Qian,Dezhen Chen
The catalytic conversion of plastic waste is often complicated by additives. This study systematically investigates the influence of nonylphenol, a common oxygenated additive, on the catalytic performance of HY (FAU-type) and HZSM-5 (MFI-type) zeolites using high-density polyethylene (HDPE) and n -octane. The research revealed that nonylphenol exhibits a dual role: it provides an initial activity enhancement via bimolecular hydride transfer but more significantly acts as a potent coke precursor, driving rapid deactivation through pore-mouth blockage. Although nonylphenol accelerated deactivation, it did not alter the fundamental cracking pathway of n -octane on either zeolite. There are significant differences in deactivation behavior and selectivity trends between HDPE raw materials and n -octane model compounds. This discrepancy reveals the limitations of using n -octane as models to predict catalyst behavior in polyethylene catalytic cracking.
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高影响因子
JOURNAL OF CLINICAL INVESTIGATION
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2026
·
IF 14.3
Gengmiao Xiao,Aijun Qian,Zhuo Gao,Tingting Dai,Hui Liang,Shuai Wang,Mulan Deng,Yunjing Yan,Xindan Zhang,Xuedi Zhang,Yunping Mu,Jiqiu Wang,Aibo Gao,Huijie Zhang,Fanghong Li,Allan Zijian Zhao
Aging commonly causes decline of testosterone or estrogen, leading to overaccumulation of fatness in males or females, respectively. Although such phenomenon can be readily explained by estrogen’s direct action on adipocytes in females, accumulative evidence does not support the direct action of testosterone in adipocyte lipid metabolism, suggesting that there is a missing intermediary link. Herein, we propose that glycoprotein hormone β5 (GPHB5) is the intermediary linkage between testosterone and the regulation of adiposity. In clinical samples, blood levels of GPHB5 were correlated negatively with men’s ages, and positively with circulating testosterone. Testosterone directly stimulated the expression of GPHB5 in cultured cells, pharmacological blockade of androgen receptor (AR) functions abrogated such effect. Knockout of AR led to not only development of obesity but also reduction of GPHB5 expression. Genetic ablation of GPHB5 in the males, but not in the females, lowered the browning of white adipose tissue, diminished energy expenditure and caused severe obesity. Importantly, elevated blood testosterone didn’t exert its catabolic actions in GPHB5 null mice, and yet, recombinant GPHB5 protein was able to stimulate energy expenditure and reduce adiposity. Taken together, these results provided the strong proof that GPHB5 is the “missing” intermediary hormone linking testosterone (and aging) and its well-known catabolic effect on adipose tissue.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Yuwei Xiong,Chen Deng,Wei Ji,Yifei Sun,Richen Lin
Although cobalt (Co) and phosphorus (P) are widely employed to enhance the electrooxidation performance of Ni-based electrocatalysts, their synergistic roles in regulating metal-site activation and interfacial reconstruction during 5-hydroxymethylfurfural (HMF) oxidation remain unclear. Herein, by comparatively studying the electrochemical behavior and structural evolution of Ni-P/NF and Ni 0.8 Co 0.2 -P/NF during the HMF oxidation reaction (HMFOR), we identify a Co-P synergistic reconstruction mechanism that governs the dynamic formation of active interfaces. Ni 0.8 Co 0.2 -P/NF delivers a low onset potential of 1.33 V (vs. RHE) in 50 mM HMF-containing alkaline electrolyte and achieves a high current density of 900 mA cm −2 at 1.60 V (vs. RHE), with a Faradaic efficiency of 97 % toward FDCA. Mechanistic studies reveal that Co modulates the initial electronic structure of Ni sites, while P stabilizes the evolution of Co species into CoOOH under reaction conditions. The in situ generated CoOOH dynamically couples with neighboring Ni sites, thereby promoting the low-potential reconstruction of Ni 2+ into active NiOOH. In situ Raman spectroscopy further confirms the formation of a stable NiOOH/CoOOH composite active interface during HMFOR, which accounts for the reduced onset potential and accelerated reaction kinetics. This work highlights the importance of coupling static electronic modulation with dynamic electrochemical reconstruction, providing mechanistic insights for the rational design of multicomponent electrocatalysts for biomass-derived 5-hydroxymethylfurfural electrooxidation.
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JOURNAL OF POROUS MATERIALS
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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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CATALYSIS LETTERS
·
2011
·Vol. 141
·期 12
·1821-1827
·
IF 1.907
Duan Chao,Zhang Xin,Zhou Rui,Hua Yuan,Chen Jie,Zhang Li
HZSM-5/SAPO-34 zeolite composites were prepared by hydrothermal synthesis (ZS-HS) and mechanical mixture (ZS-MM), respectively. ZS-HS showed higher propylene yield and better catalytic stability in ethanol conversion than ZS-MM as well as HZSM-5 and SAPO-34. In case of ZS-HS, SAPO-34 at least partially overlapped on HZSM-5, which resulted in the interfacial interaction of HZSM-5 and SAPO-34. Such interaction significantly modified the texture and the acidity of ZS-HS, which in turn affected its catalytic reactivity. ZS-HS showed the higher apparent formation rate of propylene, due to its moderate concentration and strength distribution of acid sites. Propylene, ethylene and butylenes might produce through the parallel reaction pathways and the common intermediate on ZS-HS. Graphical [Time course of ethanol conversion on ZS-HS and ZS-MM catalysts.]
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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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Molecular Catalysis
·
2026
·
IF 4.3
Huamei Zhong,Xiaotong Li,Tongqing Tang,Hongyu Zhu,Xuean Song,Shewei Hu,Feifei Chen,Alei Zhang,Kequan Chen
Multi-enzyme cascade designed for 5-hydroxypipecolic acid synthesis from low-cost substrate. • Self-sufficient cofactor recycling achieved without expensive exogenous coenzymes. • Under glucose-controlled feeding, the system achieved a product titer of 23.65 g L -1 . 5-Hydroxypipecolic acid (5-HPA) is a chiral building block widely employed in pharmaceutical synthesis. Conventional chemical synthesis of 5-HPA is limited by poor stereoselectivity and environmental burdens. Herein, we developed a biosynthetic method for 5-HPA production from L-lysine (L-Lys) through a multi-enzyme cascade. Firstly, a lysine 6-aminotransferase SkL6AT from Stenotrophomonas koreensis and an imine reductase HeP5C from Halomonas elongata were screened and introduced into recombinant strains capable of converting L-Lys to L-pipecolic acid (L-PA). After optimization of plasmid copy number and ribosome-binding site strength, as well as establishment of the NADH regeneration system, the L-PA titer reached 7.50 g L⁻¹. Subsequently, a hydroxylase XdPH from Xenorhabdus doucetiae was introduced to construct a 5-HPA-producing strain. Fermentation conditions were optimized in shake flasks and subsequently scaled up to a 5 L bioreactor. Under a fed-batch strategy, the final engineered strain produced 23.65 g L -1 5-HPA with a yield of 0.587 g g⁻¹ from L-Lys. Download: Download high-res image (192KB) Download: Download full-size image
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