CHEMICAL PAPERS
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2026
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IF 2.7
Gu Yu-Qing,Fan Cong-Xuan,Xing Shi-Feng,Zhu Hong-Jun
Modified TS-1 catalysts were prepared by treating TS-1 with different alkalis for the nitration of aldoxime, and the effect of alkali treatment on catalytic performance was investigated. TS-1 was modified using organic amines such as ethylamine (EA), triethylamine (TEA), and tetrapropylammonium hydroxide (TPAOH), as well as inorganic bases such as NaOH, KOH. The catalysts were characterized by XRD, FT-IR, UV-vis, N 2 adsorption etc., which showed that the volume of mesopores increased and the skeleton structure remained basically unchanged by the ethylamine-modified TS-1 and the TPAOH-modified TS-1. The highest yield of 1-nitropropane increased 78% when propionaldehyde oxime was catalyzed by the 0.1 mol/L ethylamine treated sample TS-1-EA-0.1. The enhanced catalytic performance of TS-1 after ethylamine treatment may be attributed to the matching between the pore size of modified TS‑1 and the molecular size of propionaldehyde oxime. Subsequently, TS-1-EA-0.1 was used to catalyze acetaldoxime and butyraldehyde oxime. The results revealed that this catalyst was suitable for acetaldehyde oxime as expected, but less effective for the oxidation of butyraldehyde oxime with a larger molecular diameter than propionaldehyde oxime to 1-nitrobutane. Graphical abstract
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PLANT BIOTECHNOLOGY JOURNAL
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2025
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IF 10.5
Shu-Yue Zhang,Jian-Qiang Kong
Summary OSW-1 is a cholestane saponin uniquely produced in Ornithogalum saundersiae and exhibits a potential antitumor activity. The enzymes responsible for OSW-1 biosynthesis in O. saundersiae , however, remain unclear. Herein, cholesterol was confirmed to be the precursor of OSW-1 using stable-isotope labeling method. Next, two cytochrome P450s, Os CYP90B94 and Os CYP90G11, and their partner cytochrome P450 reductase Os CPR2 were mined by comparable transcriptome analysis and demonstrated to be involved in OSW-1 biosynthesis. Specifically, Os CYP90B94 catalyses cholesterol to 22 R -hydroxycholesterol, which is then converted to 16 β -hydroxy-22-oxo-cholesterol, a precursor of OSW-1 by the second P450 O sCYP90G11 via two consecutive oxidation reactions. Unlike their homologues, Os CYP90G11 and Os CYP90B94 displayed broader catalytic promiscuity. Os CYP90B94 recognizes both cholesterol and 7 β -hydroxycholesterol, while Os CYP90G11 can react with cholesterol, 22 R -hydroxycholesterol and 16 β ,22 R -dihydroxycholesterol, suggesting their involvement in more than one pathway besides OSW-1 biosynthesis. This study lays a foundation for the complete characterization of OSW-1 biosynthesis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Xiaolong Tan,Xiangguo Zhang,Yushi He,Zeyi Jiang,Cheng Bao,Nien-Chu Lai
Carbon monoxide selective methanation (CO-SMET) holds promise for removing low-concentration CO in the hydrocarbon reforming for hydrogen (H 2 ) production process and is a deep CO removal technology suitable for low-temperature fuel cells. However, developing highly efficient CO-SMET catalysts remains a significant challenge. Herein, we report a supported catalyst (Ru 1.0 (Cl)/TiO 2 ) with highly dispersed ruthenium (Ru) metal on a high-specific-surface-area mesoporous titanium dioxide (TiO 2 ) catalyst. This catalyst exhibits excellent performance in CO-SMET. It can reduce the CO concentration to below 10 ppm in a wide temperature range of 190–300 °C, and the outlet CO concentration can reach an ultra-low level of 0.2 ppm in the optimal temperature zone (210–220 °C). Through XPS and in situ DRIFTS characterizations, the crucial role of Ru–Cl species at the metal-support interface is revealed. The presence of chlorine atoms leads to electron enrichment in the Ru metal, enhancing its adsorption and activation of CO.
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JOURNAL OF SOLID STATE CHEMISTRY
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2025
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IF 3.5
Jun Liu,Yongpeng Chen,Xiuyan Zhang,Zhenye Ma
In this article, copper-based metal organic framework (MOF) HKUST-1 was synthesized via room temperature stirring method, and a series of HKUST-1/AP composite particles with different mass ratios were prepared via mechanical grinding method; The morphology and structure of the prepared HKUST-1 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), and the particle size data were measured by laser particle size analyzer; Thermogravimetric analysis-differential scanning calorimetry (TG-DSC) was employed to evaluate the catalytic activity of HKUST-1 during AP thermal decomposition. The results revealed that variations in copper salt type exerted a marked influence on HKUST-1's powder particle size. The addition of 4 % HKUST-1-C, HKUST-1-S, HKUST-1-N, and HKUST-1-Cl respectively reduces the high-temperature decomposition (HTD) temperature of AP by 113.5 °C, 113.1 °C, 107.4 °C, and 107.7 °C. Concurrently, the heat release of AP undergoes a dramatic increase, rising from the initial 415.71 J/g to 1188 J/g, 1181 J/g, 864.8 J/g, and 856.8 J/g for each corresponding sample. Among them, HKUST-1-C demonstrated superior catalytic performance, characterized by a remarkable reduction in the HTD of ammonium perchlorate by 110.8 °C with only a 2 % addition. Notably, this catalyst enhanced heat release by 750.3 J/g and decreased the reaction activation energy by 66.9 kJ/mol, thereby significantly improving the overall thermodynamic efficiency of the system.
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CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Qi Liu,Yihan Yin,Hongxia Gao,Lianbo Liu,Shisen Xu,Teerawat Sema,Min Xiao,Zhiwu Liang
Amine degradation is one of the key issues that hampers the implementation of large-scale carbon capture technology. Degradation inhibitors can extend the lifetime of amine solutions, thereby lowering the operating cost of CO 2 capture system in the long term. In this work, different inhibitors including chelating agents, scavengers, and their blends were studied to inhibit the oxidative degradation of 1-amino-2-propanol (1AP). Amine loss, alkalinity loss, NH 3 emissions and heat-stable salt production were measured to evaluate the inhibitory effect. The parameter, namely inhibition factor, was proposed to quantify the effect of inhibitors. Two chelating agents were found to show good inhibitory effects on 1AP degradation, with inhibition factors of 7.1 and 4.3, respectively. In addition, the inhibition factor was increased to 9.4 by blending the inhibitors. A significant reduction in the inhibitor dosage was applied to achieve a similar inhibiting effect due to the excellent synergistic effects between the blended inhibitors.
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ACS Catalysis
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2025
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IF 13.1
Yousheng Zhou,Chuanlei Liu,Peicheng Li,Yifan Wang,Qiyue Zhao,Hao Jiang,Qiumin Wu,Benxian Shen,Hui Sun,Xuejiao Han
Olefin oligomerization plays a pivotal role in producing value-added chemicals and functional materials, driving the development of the chemical industry. Acid catalysts are widely utilized in olefin oligomerization, yet precisely controlling acidity remains a significant challenge due to the considerable difficulties in regulating the complex coordination of the active components with the supports. In this study, a series of Al-modified dendritic fibrous nanosilica catalysts (Al-DFNS) were synthesized and applied in the oligomerization of 1-decene to polyalphaolefins (PAOs). Multiple characterizations elucidate that the hydrogen-replaced Al-DFNS (H-Al-DFNS) featured a unique three-dimensional center-radial channel with hierarchical pores, while pulsed-field gradient nuclear magnetic resonance (PFG-NMR) further indicates that the high density of accessible acidic sites and diffusion-limited pore properties lead to much higher catalytic efficiency than diverse siliceous catalysts. Acid distribution measurement and product analysis together reveal that H-Al-DFNS has a well-balanced ratio of Brønsted acid sites (BAS) to Lewis acid sites (LAS). Specifically, high acid strength enhances hydrogen transfer and contributes to high selectivity of trimer and reduced dimer production. Density functional theory (DFT) calculation highlights the crucial role of the stability of carbocation intermediates on acid sites in the oligomerization reaction. The present work provides a reliable strategy for accurately regulated acidity for tunable oligomerization product distribution and initiates the applications of a kind of promising catalytic material in olefin oligomerization.
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INDUSTRIAL CROPS AND PRODUCTS
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2026
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IF 6.4
Huili Cui,Zhu Liu,Kongze Wei,Jia Yu,Lei Wang,Changhao Chen,Jie Deng,Junyan Zhu,Chaoling Wei,Yue Fei
Varietal character is a key factor in determining the flavor and quality of tea. Lu’an Guapian (LAGP) is a historical Chinese green tea, yet it lacks a representative elite cultivar. To address this, we explored the varietal characteristics of LAGP processed from the recently bred elite cultivar ‘Jinyu 1’ (JY1). Using molecular sensory science and metabolomics, we analyzed its volatile and non-volatile compounds. LAGP possessed from JY1 presents a unique flavor, with floral, coconut-like, and citrus-like aromas, along with a fresh and mellow taste. This aroma was attributed to high contents of (Z) -jasmone, decanal, 1-nonanol, methyl jasmonate, δ -decalactone, β -ionone, geraniol and jasmine lactone. High levels of theanine and a low content of bitter amino acids contribute to its taste. This study confirms that JY1 is a high-quality source material for producing premium-grade LAGP, highlighting the critical role of cultivars in enhancing tea quality and market competitiveness.
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PLANT JOURNAL
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2026
·Vol. 125
·期 1
·e70678
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IF 5.7
Yueqiao Wang,Pengfei Cheng,Ke Jiang,Jiaxin Gong,Ziyu Liu,Wenbiao Shen
SUMMARY The endogenous hydrogen (H 2 ) synthesis pathway in higher plants has been a mystery for nearly a century. Here, we report that the tomato Nuclear Architecture Related 1 (NAR1) protein is an enzymatic source of plant-based H 2 . Mutation experiments found that the H 2 -producing hydrogenase activity is closely related to four H-cluster coordinating cysteine residues and is positively regulated in darkness. Contrary changes in H 2 production and lateral root (LR) branching were individually observed in SlNAR1 overexpression and mutant lines. The homozygous lethal effect of knocking out tomato NAR1 was also observed. Genetic and anatomic evidence confirmed that NAR1 control of endogenous H 2 is a signaling mechanism that manipulates the expression of polar auxin transporters. Auxin accumulation in LR primordium and oscillation zone and LR branching stimulation were subsequently observed. Pot-cultured transgenic tomato plants overexpressing SlNAR1 display a luxuriant root system. These findings identify a mechanism for genetic engineering to regulate root organogenesis through alteration of NAR1-dependent H 2 .
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.7
Yingdi Jiang,Wanbin Zhan,Chao Yang,Jing Zhang,Changjiu Xia,Gang Qian,Xuezhi Duan
The direct hydroxylation of benzene with hydrogen peroxide (H 2 O 2 ) over titanium silicalite-1 (TS-1) offers an environmentally benign route to phenol, though its efficiency is highly dependent on the solvent environment. By integrating experimental and theoretical approaches, this study reveals the underlying mechanism. Water uniquely boosts benzene conversion to 45.8% through synergistic effects. It serves as a proton-transfer mediator to lower the activation barrier (Δ G ), enhances the electrophilicity of Ti-active sites via increased maximum electrostatic potential (ESP max ), and leverages the hydrophobic pores of TS-1 to enrich benzene near the active sites. However, this this multifunctional enhancement also promotes over-oxidation, limiting phenol selectivity to 42.8%. In contrast, the organic solvents suppress consecutive oxidation and achieve high selectivity above 70% due to their larger HOMO-LUMO energy gaps ( E gap ). Yet they exhibit low activity owing to higher energy barriers, weaker electrophilicity, and competitive adsorption. This work further establishes quantitative correlations between catalytic performance and key descriptors such as Δ G , ESP max , and E gap , providing a predictive framework for rational solvent selection in TS-1 catalysis.
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INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
·
2024
·Vol. 64
·期 2
·107225
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IF 4.9
Yali Zhang,Mengyue Liu,Jiangfeng Zhang,Jie Wu,Lijuan Hong,LiQiang Zhu,Jinzhao Long
bla NDM-1 and bla KPC-2 are responsible for the global increase in carbapenem-resistant Klebsiella pneumoniae , posing a great challenge to public health. However, the impact of phylogenetic factors on the dissemination of bla NDM-1 and bla KPC-2 is not yet fully understood . This study established a global dataset of 4051 bla NDM-1 + and 10,223 bla KPC-2 + K. pneumoniae genomes, and compared their transmission modes on a global scale. The results showed that bla NDM-1 + K. pneumoniae genomes exhibited a broader geographical distribution and higher sequence type (ST) richness than bla KPC-2 + genomes, indicating higher transmissibility of the bla NDM-1 gene. Furthermore, bla NDM-1 + genomes displayed significant differences in ST lineage, antibiotic resistance gene composition, virulence gene composition and genetic environments compared with bla KPC-2 + genomes, suggesting distinct dissemination mechanisms. bla NDM-1 + genomes were predominantly associated with ST147 and ST16, whereas bla KPC-2 + genomes were mainly found in ST11 and ST258. Significantly different accessory genes were identified between bla NDM-1 + and bla KPC-2 + genomes. The preference for bla KPC-2 distribution across certain countries, ST lineages and genetic environments underscores vertical spread as the primary mechanism driving the expansion of bla KPC-2 . In contrast, bla NDM-1 + genomes did not display such a strong preference, confirming that the dissemination of bla NDM-1 mainly depends on horizontal gene transfer. Overall, this study demonstrates different phylogenetic drivers for the dissemination of bla NDM-1 and bla KPC-2 , providing new insights into their global transmission dynamics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2013
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IF 3.172
Jingjing Jiao,Bing Han,Meijia Lin,Ni Cheng,Li Yu,Min Liu
A series of salt-free catanionic surface active ionic liquids (SAILs), 1-alkyl-3-methylimidazolim alkyl sulfates (denoted as [C n mim][C m SO 4 ], n = 6, 8, 10; m = 12 and n = 4; m = 10, 14) were synthesized by an ion exchange reaction and their surface properties in aqueous solution were examined systematically by surface tension, fluorescence and electrical conductivity measurements. As catanionic surfactants, these SAILs exhibit notably higher surface activity, compared to the cationic or anionic analogues. Increment in both cationic and anionic alkyl chain lengths for [C n mim][C m SO 4 ] can both improve the amphiphilic character remarkably. This can be ascribed to cooperative interactions as formation of catanionic pairs between alkyl-substituted imidazolium cations and alkyl sulfate anions. The negative micellization Gibbs free energy values prove that the micellization of all the 1-alkyl-3-methylimidazolim alkyl sulfates investigated is a spontaneous process. Any additional CH 2 group makes the micellization process easier regardless if it is on a cation or an anion. When keeping the total carbon atom number constant, we find that the [C n mim][C m SO 4 ] molecules with greater asymmetric alkyl chains display superior surface activity. This work indicates that the self-assembly of these imidazolium-based salt-free catanionic SAILs can be tailored by adjusting the mismatch of alkyl chains. These SAILs are expected to have potential applications in the fields of colloidal and interface and nanomaterial synthesis.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Qi Liu,Xiaoxiao Chen,Yan Guo,Chuanhong Han,Jing Li,Lihan Jia,Jie Liu,Xilian Wei
A ternary phase diagram of the system of 1-butyl-3-methylimidazolium tetrafluoroborate ([ Bmim ]BF4), sodium dodecylbenzenesulfonate (SDBS) and water using ocular estimate and turbidity method was drawn based on experimental data at 298.2 K. We got a narrow aqueous two-phase region near the side of water-ionic liquid (IL). A series of samples with different compositions around the phase diagram were chosen. The enthalpy change of these systems after injecting triply distilled water into these samples has been studied by using isothermal titration microcalorimetry (ITC). It is found that with increasing the water content there are weak endothermic and exothermic processes appearing, separately, which matches perfectly with the location of the formation and disappearance of the aqueous two-phase in the ternary phase diagram. This suggests the ITC is a feasible and effective method for the thermodynamic study of aqueous two-phase systems (ATPS) and was first reported. The experimental results show that the formation of the ATPS is endothermic (Δ H > 0), but the process of disappearing is exothermic (Δ H < 0). Due to the formation of aqueous two-phase is a thermodynamic spontaneous process under the isothermal constant pressure, we can judge that the formation of this ATPS is an entropy driven course and the vanishing is a synergy driven process by entropy and enthalpy.
研究领域:
物理化学
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热力学
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胶体与界面化学
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分离科学
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分析化学
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