CATALYSIS SURVEYS FROM ASIA
·
2021
·Vol. 26
·期 1
·35-45
·
IF 3.106
Shan Shufeng,Tian Yiting,Chen Feifei,Wu Shikui,Zhou Rujin,Xie Ying,Li Ning,Zeng Xingye,Lin Cunhui,Yu Wei
NiMoS supported on ZSM-5 with different Si/Al ratio, crystallite size and pore structure was prepared by incipient impregnation method and applied in 1, 3, 5-trimethylbenzene (1, 3, 5-TMB) hydrodealkylation (HDAK). The physicochemical properties of samples were characterized by XRD, FTIR, SEM, N 2 adsorption–desorption, NH 3 -TPD, Py-FTIR, H 2 -TPR, HRTEM and TGA. It is demonstrated that for microporous NiMoS/ZSM-5, acid amount and crystallite size of HZSM-5 are key factors affecting HDAK performance. The larger acid amount and smaller crystallite size can promote the conversion of 1, 3, 5-TMB, especially the dealkylation reaction, resulting in higher BTX yield. Compared to NiMoZ-3, mesopores in micro-mesoporous NiMoAKZ-3 are beneficial to accessibility of 1, 3, 5-TMB to NiMoS and acid sites in close proximity, and the diffusion of reactant and product molecules inside pores, thus resulting in superior HDAK performance of NiMoAKZ-3. Moreover, the reaction network of 1, 3, 5-TMB HDAK was revealed according to product distribution. Graphic Abstract NiMoS supported on ZSM-5 was developed for heavy aromatic hydrodealkylation (HDAK). Acid amount and crystallite size of microporous ZSM-5 are key factors affecting 1,3,5-trimethylbenzene (1,3,5-TMB) HDAK. Mesopores inside ZSM-5 facilitate accessibility of 1,3,5-TMB to NiMoS and acid sites in close proximity and improve HDAK performance.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Dan Zhao,Shi-Rui Zhang,Yan-Ping Fan,Bao-Zhong Liu,Rui-Juan Zhang
The relationship between the structure and properties is always a hot topic in the luminescent material field. In this work, a new phosphor KBa2(PO3)5:Eu2+ (KBP:Eu) was prepared by a high-temperature solid-state reaction method and characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, photoluminescence (PL), and electroluminescence studies. The polyphosphate host KBP offers three lattice environments (K1, Ba1, and Ba2) for Eu2+ ions to realize broad-band emission from 380 to 700 nm under 345 nm excitation. The distributions of Eu2+ in the three lattice sites can be proven by low-temperature PL and transient fluorescence spectroscopy. Furthermore, temperature-dependent luminescence studies for phosphor KBP:0.02Eu reveal that its luminescence intensity at 150 °C retains about 97% of the initial value at 25 °C. By composing a 365 nm UV chip and KBP:0.02Eu, CaAlSiN3:Eu2+ phosphors, a warm white-light-emitting diode (WLED) was obtained with a correlated color temperature of 5146 K and chromaticity coordinates (0.3404, 0.3384). Therefore, KBP:Eu phosphor is a potential cyan-emitting phosphor used for high-power WLEDs.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiayu Feng,Fei Wang,Chi Wang,Kai Li,Xin Sun,Ping Ning
In this study, an NH3 plasma-treated Cu/HZSM-5 sorbent was introduced to simultaneously remove H2S and PH3 in low-temperature and low-oxygen environments. The effects of the Cu loading amounts, modification methods, and plasma-treatment conditions on the adsorption–oxidation performance of the sorbents were investigated. From the performance test results, the sorbent treated by NH3 plasma with the specific energy input (SEI, electrical input energy to the unit volume of gas) value of 1 J·mL–1 (Cu/HZSM-5-[S1]) was identified as having the highest breakthrough capacities of 108.9 mg S·g–1 and 150.9 mg P·g–1 among all of the materials tested. After three times of regeneration, the sorbent can still maintain the ideal performance. The results of Fourier transform infrared (FT-IR) spectroscopy and CO2 temperature-programmed desorption (CO2-TPD) indicated that the NH3 plasma treatment can introduce amino groups (functional groups) onto the sorbent surface, which greatly increases the number and strength of the basic sites on the sorbent surface. Results of N2 adsorption/desorption isotherms and scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS) showed that the morphology of the sorbent changed after the plasma treatment, which exposed more active sites (copper species). In situ IR spectra showed that the amino groups are continuously consumed during the reaction process, indicating that these amino groups can help sorbents to capture gas molecules. Moreover, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses indicated that CuO is the main active species and the consumption of CuO and accumulation of the reaction products on the surface and inner pores of the sorbent are the primary reasons for the deactivation of the sorbent.
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 37
·375603
·
IF 3.551
Guoyue Qiao,Qinqin Xu,Aiqin Wang,Dan Zhou,Jianzhong Yin
Herein, the desorption effect of supercritical CO2 (scCO2) was utilized to obtain sub-5 nm Ag nanoparticles (NPs) with a high Ag loading in SBA-15. The size of the Ag NPs decreased from 3.54 ± 0.79 nm (Ag loading of 25.3 wt.% wt.%) to 2.38 ± 0.68 (Ag loading of 10.5 wt%) nm by changing the depressurization curve from 0.1 MPa min−1 (20–14 MPa) to 3 MPa min−1 (20–12 MPa). Meanwhile, the intensity of the crystalline Ag characteristic peaks was obviously higher than the latter sample from the x-ray diffraction (XRD) patterns. However, compared with the adsorption kinetics of the two precursors of AgNO3 and Cu(NO3)2 on SBA-15, under the same deposition and depressurization conditions, when the two depositional systems used water as a co-solvent, the time taken to reach the adsorption equilibrium of Ag+ on the supports was longer than the time taken by Cu2+, which existed in the water as [Cu(H2O)4]2+. The surface of SBA-15 was hydrophilic, and then the interaction of Ag+ and the surface was weaker compared with Cu2+, making Ag+ highly dispersed on the surface under the scCO2 desorption effect. After calcination, the size of the Ag NPs decreased, but the morphology of CuO was mainly characterized by nanorods (NRs). Moreover, by comparing the experiments of wetness impregnation, the dispersion ability of the bulk scCO2 of the reactor was inefficient for Ag+ adsorbed on the channels in the depressurization process.
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DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 5
·742-753
·
IF 11.534
Guo Meng,Liu Yufeng,Zhang Fengnian,Cheng Fuhao,Cheng Chufei,Miao Yang,Gao Feng,Yu Jun
A series of high-entropy perovskite oxides (HEPOs) La(CoCrFeMnNiAl x ) 1/(5+ x ) O 3− δ ( x = 0.4, 0.5, 0.6, and 0.7) have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for supercapacitors. The crystal structure, microstructure, and elemental composition of HEPOs were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) in detail. The electrochemical properties of HEPOs as supercapacitor electrodes were elucidated. The specific capacitances of HEPOs ( x = 0.4, 0.5, 0.6, and 0.7) are 281.84, 353.65, 325.60, and 259.30 F/g at the current density of 1 A/g, respectively. After 2000 cycles, the specific capacitances of HEPOs ( x = 0.4, 0.5, 0.6, and 0.7) remain 85.01%, 88.61%, 86.37%, and 91.25%, respectively. Such outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al 3+ -doping suppressing active ion aggregation during charge—discharge process. This research highlights the potential of HEPOs as electrodes for supercapacitors.
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DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 40
·6319-6327
·
IF 3.304
Yu Shen,Zongzhuang Han,Hang Li,Haichao Li,Gang Wang,Fumin Wang,Xubin Zhang
Hierarchical ZSM-5 zeolite with short-range ordered mesoporosity and hierarchical ZSM-5 zeolite nanorods were obtained via a direct hydrothermal synthesis by the cooperative structure direction of dimethyloctadecyl[3-(trimethoxysilyl)propyl]- ammonium chloride (TPOAC) and tetrapropylammonium hydroxide (TPAOH). Dimethyloctadecyl[3-(dimethoxymethylsilyl)propyl]ammonium chloride (DPOAC) and octadecyltrimethylammonium chloride (OTAC) were also employed as structure directing agents (SDA) to further explore the role of methoxysilyl groups in organosilanes during the formation of hierarchical structure. The prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N2 adsorption–desorption, FT-IR, UV-vis and inductively coupled plasma-optical emission spectroscopy (ICP-OES). The characterization results showed that the use of TPOAC and DPOAC would generate short-range ordered mesopores and irregular mesopores, respectively. Hierarchical ZSM-5 zeolite nanorods with worm-like intracrystalline mesopores could be obtained by adjusting the amount of silicon source. The lack of methoxysilyl groups in OTAC however could lead to phase separation problems. Furthermore, the hierarchical Fe-ZSM-5 zeolite with short-range ordered mesoporosity showed enhanced catalytic activity and stability for the hydroxylation of phenol at room temperature.
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 78
·63866-63873
·
IF 3.84
Yujie Qiang,Shengtao Zhang,Shenying Xu,Linliang Yin
The inhibition effect of 5-nitroindazole on the corrosion of copper in a 3.0% NaCl solution was investigated with the methods of weight loss, electrochemical tests, scanning electronic microscopy (SEM) and theoretical calculations. The weight loss and electrochemical results revealed that 5-nitroindazole is a mixed-type inhibitor with the inhibition efficiency is up to 99% at 0.4 mM, which was further confirmed by SEM observation. The adsorption of the inhibitor molecule on the copper surface was found to obey the Langmuir adsorption isotherm. The quantum chemical calculations and molecular dynamics simulation showed that 5-nitroindazole is adsorbed strongly on the copper surface in a parallel mode through the indazole ring.
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Zhan Liu,Jia-Min Lyu,Chun-Mu Guo,Zhi-Yi Hu,Ming-Hui Sun,Li-Hua Chen,Bao-Lian Su
Hierarchically porous zeolites, combining the intrinsic microporous catalytic properties and the enhanced meso-/macroporous access and transport, exhibit excellent performances in many highly efficient catalytic processes. The acidity and porosity are two key factors affecting the catalytic conversion, selectivity and lifetime. It is necessary to construct such hierarchically porous zeolite catalysts with adjustable acid active sites and pore properties in a wide range to meet the specific catalytic requirements. Herein, an ordered interconnected hierarchical ZSM-5 single crystal catalyst composed by zeolite sphere units stacking in face-centered cubic (FCC) arrangement has been used as the theoretical model to research the corresponding material properties on the enhancement of specific catalytic process. Specifically, the properties of acid sites and meso-/macropores can be accurately adjusted by facilely changing the SiO 2 /Al 2 O 3 molar ratio (100–1000) and the sphere unit size (180–580 nm), respectively. As a result, the benzyl alcohol liquid-phase catalytic ability markedly improved thanks to the optimized acidity and meso-/macropore size. The larger meso-/macropore size shows higher benzyl alcohol conversion, while the higher SiO 2 /Al 2 O 3 molar ratio exhibits higher alkylation product selectivity. This work illustrate that the targeted catalytic process can be effectively enhanced by adjusting the acidity and porosity within such ordered hierarchical ZSM-5 single crystal system.
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Yu Jia,Fuwei Lu,Youzhou Jiao,Hongge Tao,Jinbo Hao,Guizhuan Xu,Chao He,Xinxin Liu,Chun Chang,Yaxing Song,Binglin Chen
Solvent and catalyst are important factors in the synthesis of 5-hydroxymethylfurfural (HMF). Herein, different solvents and catalysts were selected to explore the synergistic mechanism to boost the conversion of cellulose to HMF. It was found that low-polarity aprotic (molecular polarizability index <15) and medium basicity (800 kJ/mol < protonation affinity <840 kJ/mol) solvents, such as 1,4-dioxane, tetrahydrofuran (THF) and methyl isobutyl ketone (MIBK) were optimal for homogeneous Brønsted acid-catalyzed HMF production from cellulose. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy gap of Brønsted acid-catalyzed cellulose conversion were significantly reduced by adding these solvents. Molecular dynamics (MD) simulation revealed that in 1,4-dioxane/H 2 O system, H 2 SO 4 was aggregated to the ring oxygen of cellobiose, as well as the C1-OH and C2-OH groups of glucose. This aggregation process effectively promoted the protonation of cellobiose at the O1 position. The reaction conditions were optimized via response surface methodology leading to a maximum HMF yield of 56.5 % in 1,4-dioxane/H 2 O (water content 5.3 %),under the conditions of 193 °C and 67 min. The synergistic mechanism will be beneficial for the rational selection of system in the production of high-valued chemicals from biomass.
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产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Duoduo Zhang,Kunying Chen,Yongkang Yu,Ruting Feng,Steve W. Cui,Xingtao Zhou,Shaoping Nie
Metabolites of dietary fibers which consist of non-digestible carbohydrates (usually as plant-based polysaccharides) exert many benefits on gastrointestinal health. Previous studies proved that polysaccharides can change intestinal metabolic pathways, increase metabolite levels and alleviate intestinal inflammation. Our previous studies have shown that polysaccharide from Aloe vera gel (AGP) alleviated intestinal barrier dysfunction. However, whether intestinal protective function of AGP was related to metabolites need further exploration. Therefore, the effects of AGP on intestinal metabolites and the relevant mechanisms for subsequent mitigation of intestinal damage was investigated in this work. Metabolomics analysis results showed that AGP promoted tryptophan metabolism to 5-hydroxytryptamine (5-HT). Intriguingly, antibiotics treatment decreased the expression of tryptophan hydroxylase 1 (TPH1) in the intestinal epithelium of mice, and TPH1 inhibitor (PCPA) down-regulated 5-HT level in colonic contents, proving that AGP up-regulated TPH1 expression in the intestinal epithelium by restoring intestinal microbiota homeostasis, thus promoted the intestinal tryptophan metabolism to 5-HT. Combination of bioinformatics analysis of RNA-sequencing (RNA-Seq) in mice colon and the reported relationship among “5-HT, Htr4 (one of the 5-HT receptors), Kit + goblet cells, canonical Wnt pathway and intestinal stem cells (ISCs)” guided the confirmation of related mechanism in intestinal organoids (IOs) that 5-HT regulated ISCs function and intestinal barrier via Htr4-Kit-Wnt3 axis. Overall, AGP promoted 5-HT production to alleviate intestinal injury. This study revealed the effects of polysaccharides on intestinal health, which was critical and may provide new insights for the reasonable selection of dietary fiber to prevent intestinal inflammation and maintain intestinal function.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yu Zhou,Ning Li,Caiping Ma,Xiaohua Shen,Xiaofeng Li,Baojun Wang,Lixia Ling
Ga-ZSM-5 zeolite has excellent performance for methanol to aromatics (MTA) reactions, but introducing Ga metal into ZSM-5 zeolite leads to a complex acid species. The present study investigated the effect of Ga metal content on the acid amount and MTA reaction products in the hydrothermal synthesis of Ga-ZSM-5 zeolite. Lewis acid mainly formed at a Ga/Al ratio below 2.0, and at a Ga/Al ratio higher than 2.0, framework Ga species formed, increasing Brønsted acid content. Ga 2.0 -ZSM-5 zeolite exhibited the lowest B/L acid ratio (0.48), excellent BTX selectivity (40.26%), and the highest H 2 selectivity (8.93%). This finding indicates the most pronounced synergistic hydrogenation of Brønsted and Lewis acids. Ga 3.0 -ZSM-5 produced more xylene with more Brønsted acid compared to Ga 1.0 -ZSM-5, although they both had the same B/L acid ratio. The alterations in acidic species at different content of Ga metal appear to be conducive to the regulation of acidity in Ga-ZSM-5 zeolites.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Qichao Lu,Jie Li,Chen Liang,Lei Liu,Jinxiang Dong
Under the dual pressures of oil depletion and low-carbon transition, Fischer-Tropsch synthesis (FTS) technology offers a viable option for producing high value-added lower (C 2 -C 4 ) hydrocarbons from non-oil sources. However, conventional Fe-based catalysts often suffer from deactivation due to carbon deposition and sintering. Here, we report a unique Fe-ZSM-5 catalyst synthesized by doping Fe into ZSM-5, which demonstrates excellent FTS catalytic performance. During high-temperature template removal, Fe species migrated from the zeolite framework to form highly dispersed FeO x clusters (∼2 nm). Upon treatment by syngas, these FeO x clusters aggregate to form uniformly small-sized Fe 5 C 2 @C core-shell particles distributed on ZSM-5 support. The confinement effect of the inter-crystalline structure effectively prevents the sintering of Fe 5 C 2 . The smaller Fe 5 C 2 particles exhibit controlled CO dissociation, reducing the concentration of activated carbon species (C*), and the carbon shells (∼6.5 nm) limit the departure of C*, effectively suppressing carbon deposition. This unique structure enables stable catalytic activity for over 100 hours with maintained product selectivity. The Fe-ZSM-5 catalyst achieved a C 2 -C 4 hydrocarbons selectivity of 54.52 %, nearing the 56 % theoretical limit of the Anderson-Schulz-Flory (ASF) distribution. Additionally, the hydrophobic carbon shell prevents excessive oxidation of Fe 5 C 2 , reducing CO 2 selectivity by ∼56 % compared to conventional Fe/ZSM-5 catalysts, significantly enhancing atomic utilization efficiency and aligning with the principles of green development.
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高影响因子
危险品化学品经营许可证（带存储）