FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Xin Ning,Junwen Chen,Qi Zuo,Wenlin Li,Jiajun Zheng,Ruifeng Li
Light alkenes oligomerization , performed in the presence of solid acid catalysts , is an important alternative for the production of clean jet fuels. For 1-hexene oligomerization, the current catalyst often suffers from low activity and selectivity. The developed process is upgraded by zeolite catalyst, targeting high-concentration of jet-range hydrocarbons. An efficient and selective IM-5 zeolite-derived catalytic system has been developed for the oligomerization of 1-hexene. The treatment in an aqueous NH 4 F solution led to dealumination without structure degradation. The IM-5 zeolite with a unique two-dimensional IMF structure and 2.5 nm nanoslab showed rapid diffusion ability than ZSM-5 zeolite. Enhance acidities were observed in the NH 4 F-treated IM-5 zeolites owing to fluoride residue and the removal of Al atoms. The strong Brønsted acid sites exerted a positive effect on both the cracking and the oligomerization reactions with the increasing of the yields of dimers. The contact time and partial pressure between the 1-hexene and the IM-5 zeolites were used to analyze the competition of cracking reactions. High 1-hexene conversion (62%), optimal oligomerization to C 3 -C 5 ratio (O/C = 32), and reasonable stability were obtained over the etched IM-5 catalyst at 240 °C, 4 MPa, and the flow rate of N 2 was 50 mL/min.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mei-Ling Xu,Jia-Ran Li,Xiu-Mei Wu,Ting Yu,Guan-Ying Qin,Fu-Ji Wang,Li-Na Zhang,Kui Li,Xin Cheng
Covalent organic frameworks (COFs) as an emerging porous material have exhibited excellent application prospects in the field of photocatalysis. Nevertheless, the overall water splitting using solar energy by COF-based photocatalysts remains a huge challenge due to the rapid charge recombination and insufficient redox catalytic capacity. Herein, for the first time, the novel Fe-MOF-derived α-Fe 2 O 3 and FeP-PC was designed and adopted as dual co-catalysts to facilitate the separation and utilization efficiency of charge carriers and activate the overall water splitting performance of the ketoenamine based TpPa-1-COF, with both the porous α-Fe 2 O 3 and FeP-PC acting as the framework supporting to effectively prevent the agglomeration of TpPa-1-COF during the fabrication and photocatalytic process. Meanwhile, the construction of Z-scheme heterostructures and the connection of covalent bonds in the interface of α-Fe 2 O 3 /TpPa-1-COF/FeP-PC effectively facilitate the separation and transport of charge. Consequently, the optimal α-Fe 2 O 3 /TpPa-1-COF/FeP-PC excites very competitive photocatalytic overall water splitting performance.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Lv,Hui Pan,Jingyi Lin,Zhixin Chen,Yao Li,Hua Li,Mei Shi,Renjie Yin,Shenmin Zhu
Molybdenum disulfide (MoS 2 ) has become a promising low-cost alternative to Pt catalyst for electrochemical Hydrogen evolution reactions (HER). However, the poor conductivity and limited active sites of thermodynamically stable 2H-Phase MoS 2 hinder its catalytic performance. Utilizing phase engineering to convert 2H MoS 2 to metallic 1 T MoS 2 is an effective strategy to improve the catalytic activity of MoS 2 . The commonly used synthetic and phase engineering methods such as electrochemical exfoliation involve using a complicated synthesis route or under strict experimental conditions or both. Herein, we develop a one-pot hydrothermal method to in-situ synthesize a 2D (1 T MoS 2 )/2D (GO) heterostructure with a face-to-face contact between the ultrathin MoS 2 (few layers) and Graphene oxide (GO). The content of 1 T MoS 2 in the prepared 1 T MoS 2 /GO reaches as high as 76.7%. When used as a catalyst, 1 T MoS 2 /GO exhibited an outstanding HER performance, with a small overpotential of 209 mV at a cathode current density of 10 mA cm −2 , and an extremely low Tafel slope of 45.5 mV Dec −1 , which is very close to that of Pt/C (40.0 mV Dec −1 ). Moreover, it demonstrated an excellent stability after a storage of 212 days in air. The high electrocatalytic performance could be attributed to the high 1 T-phase content in the MoS 2 , as the 1 T phase provides numerous active sites and improves the electronic conductivity of the catalyst. Strong interactions between 1 T MoS 2 and GO substrate stabilizes the structure of the 1 T MoS 2 and allows rapid charge transfer kinetics. This work proposes a facile and effective strategy for the design and synthesis of transition metal chalcogenides with high HER performance.
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高影响因子
Molecular Catalysis
·
2021
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IF 5.062
Junyi Liu,Xianxiang Liu,Qiong Xu,Dulin Yin
A series of highly active and ortho -position selective catalysts based on (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were proposed for the C -methylation of phenol with methanol. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were synthesized by coprecipitation method of Fe and V elements and microwave drying. The chemical composition, material structure, acid-base properties, and structure-activity relationship of (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were systematically analyzed by the techniques of XRD, XPS, TEM, N 2 adsorption-desorption, Raman, UV-Vis, ESR, NH 3 /CO 2 -TPD and Pyridine-IR. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have the double advantages of high activity and high stability for the methylation of phenol due to the high BET surface area, large total pore volume, dispersive active sites and enhanced acid-base property. o -cresol and 2,6-xylenol were the main products, and nearly 100% selectivity to the ortho -position of phenol and 90% selectivity to o -cresol were obtained. Furthermore, the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts possess long lifetime over 2500 h and high activity at a weight hourly space velocity of 1.6 h −1 compared with the microwave-dried α-Fe 2 O 3 catalyst. The doping of vanadium improves the activity and stability of α-Fe 2 O 3 catalyst, which attributes to the modification of catalyst structure, especially the improvement of acid-base centers and oxygen vacancy. Recently the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have been stably and efficiently applied in industry for the methylation of phenol.
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RSC Advances
·
2021
·Vol. 11
·期 35
·21607-21621
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IF 3.361
Mingjun Cui,Xia Li
Novel nitrogen and sulfur co-doped carbon dots (N,S-CDs) were synthesized via a hydrothermal procedure using citric acid (CA) and thiourea (TU) as precursors, and the corresponding corrosion protection performance was first investigated for Q235 carbon steel in 1 M HCl solution. Experimental results indicated that N,S-CDs as mixed-type corrosion inhibitors could effectively prevent Q235 carbon steel from corrosion in 1 M HCl solution, and the corrosion inhibition efficiency was improved with the increase in N,S-CD concentration. The maximum value was achieved at 400 ppm of N,S-CDs at 25 °C, which was approximately 96.6%, 94.6% and 90.55%, according to the potentiodynamic polarization curves, EIS results and weight loss measurement, respectively. Additionally, with the temperature ranging from 25 to 55 °C, the inhibition efficiency obtained from the weight loss measurement was enhanced from 90.55% to 94.04%. Such superior inhibition effect was assigned to the physisorption and chemisorption of N,S-CDs on the Q235 carbon steel surface, which was also be confirmed by XPS analysis. The adsorption of N,S-CDs onto a steel substrate conformed to the Langmuir adsorption isotherm.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2021
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IF 3.493
Xiaoting Dong,Pengli Xue,Xian Ma,Yifan Bai,Penghui Shi,Liujiao Bian
The recognition and interaction of FEZ-1 from Legionella (FEZ-1) with penicillin V(PV) and cefoxitin(CFX) were investigated using fluorescence spectra in combination with molecular dynamics simulation (MD). The results revealed that the CFX bind with FEZ-1 in stronger interaction and induced larger conformational change than PV, despite all being forced by the electrostatic interaction and along with the changing in an environment of amino acid residues as well as the polypeptide skeleton inside the FEZ-1. Moreover, only the loop1, loop2, and N-terminal were observed locating near the binding pocket of FEZ-1, consisting of a flexible “gate-like” zone with better adaptability that controlled the entrance of antibiotic into the pocket by allowing the newly introduced antibiotic to match the pocket better through the conformational changes of these three substructures in the binding procedure. The current study may provide some valuable information on the antibiotic hydrolytic process by metallo-beta-lactamase and thus the references for the development of new antibiotics for super bacteria.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
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IF 3.764
Shichao Han,Pan Liu,Ye Ma,Qinming Wu,Xiangju Meng,Feng-Shou Xiao
Calcination-free fabrication of highly b-oriented silicalite-1 (S-1) zeolite films in the absence of organic structure-directing agents (OSDAs) is attractive but still challenging. Herein, for the first time, we show a novel route for calcination-free synthesis of a b-oriented S-1 zeolite film in the absence of OSDAs. The key to this success is a rational secondary growth of zeolite crystals on the surface of supports by avoidance of the formation of zeolite nuclei in the system due to the absence of OSDAs. Because of OSDA-free synthesis of S-1, it not only reduces the cost of zeolite films but also avoids the calcination of OSDAs in the synthesis, thus avoiding the formation of cracks in the zeolite films. In addition, the calcination-free fabrication is favorable for reduction of zeolite film defects such as a terminal OH group. As a result, the zeolite films obtained from this work exhibit higher hydrophobicity than the conventional one. Furthermore, the current polarization curve of this S-1 zeolite film shows excellent corrosion resistance. The aforementioned features would be potentially important for industrial application of zeolite films in the near future.
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高影响因子
Frontiers in Microbiology
·
2021
·
IF 5.64
Huang Maoxi,Yan Yunlong,Wang Li,Chen Jun,Liu Tao,Xie Xin,Li Xiangyang
Amino-phosphonate derivative R-diphenyl-1-(4-methylbenzothiazole-2-amino)-1-(thiphene-2-yl)-methylphosphonate (Q-R) has a high protective anti-tobacco mosaic virus (TMV) activity. However, the mechanism responsible for Q-R’s effect on TMV infection is largely unknown. Here, we studied the expression levels of harpin-binding protein 1 (HrBP1) and pathogenesis-related protein-1a (PR-1a) in TMV-infected tobacco plants by using reverse transcription quantitative real-time PCR. Then, we verified the interactions between Q-R and the HrBP1 protein from Escherichia coli using isothermal titration calorimetry and studied the Q-R-associated assembly of HrBP1 using size-exclusion chromatography. The results showed that the expression levels of HrBP1 and PR-1a genes were significantly increased by Q-R at the transcriptional level in TMV-infected tobacco plants, and the E. coli-expressed HrBP1 protein was assembled into oligomers by Q-R via binding to HrBP1 with a dissociation constant of 1.19 μM. We, therefore, concluded that Q-R activated the HrBP1 and PR-1a genes and enhanced the ability of HrBP1 to assemble in tobacco plants.
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高影响因子
FUEL
·
2021
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IF 6.609
Liying Guo,Jinghua Du,Chengbin Li,Gaohong He,Yonghou Xiao
Developing high-efficiency adsorbents is crucial for removing aromatic sulfur containing compounds from the fossil fuels. HKUST-1 is considered as a promising candidate of adsorbents for deep desulfurization. However, the typical HKUST-1 possesses only micropores, which restricts the diffusion and limits the desulfurization capacity. Herein, we proposed a mixed-linker defect strategy to construct a bimodal micro-mesoporous HKUST-1 to enhance adsorptive removal of benzothiophene (BT) from fuels. A rapid microwave-assisted synthetic route was developed for preparing a series of micro-meso porous OH-HKUST-1 -x ( x = 0.1, 0.2 and 0.3) by adjusting the ratio of 5-hydroxyisophthalic acid to benzene-1,3,5-tricarboxylate acid. This series of hierarchically porous metal-organic frameworks (MOFs) features 0.7–0.8 nm and 3.4–3.8 nm micropore and mesopore, respectively. The effects of linker defects on the chemical and physical properties of the materials were systematically studied. The X-ray diffraction patterns showed that the as-synthesized OH-HKUST-1 -x containing hydroxyl defects still retained the original crystal structure. The OH-HKUST-1 -x exhibited a higher desulfurization efficiency in comparison with HKUST-1, because with increasing the mole ratio of the mixed linkers, larger pore diameters were generated. The bimodal micro-mesoporous structure facilitates adsorbates diffusion and leads to higher exposure of the unsaturated adsorptive site of Cu 2+ than the microporous structure. The as-synthesized OH-HKUST-1-0.2 displayed the best performance towards adsorptive removal of BT, the static and breakthrough adsorption capacity achieved 26.30 mg S g −1 and 0.0490 mmol g −1 , respectively. Additionally, after the OH-HKUST-1-0.2 was regenerated six times it still had a desulfurization performance as 88.3% of the fresh adsorbent.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-9
·
IF 5.833
Zhu Jing,Liu Xia,Zheng Jinxue,Jiang Dafeng
A dual channel method is described for the determination of the amyloid-β peptide Aβ(1–40) that is associated with Alzheimer’s disease. The method exploits (a) conformational changes of a G-quadruplex that are triggered by Na + and K + ions and (b) the strong affinity between Aβ(1–40) and Cu 2+ . A G-quadruplex DNA forms an antiparallel structure in the presence of Na + and can catalyze the oxidation of tetramethylbenzidine by H 2 O 2 system in the presence of Cu 2+ to form a visible blue color. If, however, Cu 2+ binds to Aβ(1–40), the blue color is no longer formed. Measuring the absorption decrease at 452 nm, the determination of Aβ(1–40) is realized. If K + is added to the Na + -containing buffer, the antiparallel G-quadruplex DNA is transformed to parallel. This leads to the insertion of protoporphyrin IX (PPIX) into the G-quadruplex and generates enhanced fluorescent signal, with excitation/emission wavelength at 410/630 nm. The G-quadruplex then catalyzes the metalation of PPIX by Cu 2+ , and the fluorescence intensity decreases. In the presence of Aβ(1–40), the formation of Aβ(1–40)-Cu 2+ triggers the recovery of the fluorescence. The Na + /K + -induced tuning of the conformation of the G-quadruplex with the same sequence enables dual (colorimetric and fluorometric) determination of Aβ(1–40), with detection limits of 4.9 pM and 2.3 pM, respectively. The cost is quite low since the developed strategy is label free and enzyme free by using low-cost DNA and Cu 2+ . More importantly, the dual channel determination operation is very simple without any further modification process. Graphical abstract
Tuning the conformation of G-quadruplexes by sodium(I) and potassium(I): application to photometric and fluorometric determination of amyloid β(1–40).
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Results in Physics
·
2020
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IF 4.019
Yuan Zhao,Xiaoliang Liu,Guangdi Feng,Lu Lyu,Lin Li,Shitan Wang,Jie Jiang,Youzhen Li,Dongmei Niu,Haipeng Xie,Yongli Gao
The modification of C 60 nano-interlayers on the organic field-effect transistors (OFETs) based on 2,7-diocty[1]benzothieno-[3,2-b]benzothiophene (C8-BTBT)/SiO 2 was addressed at both the electronic structure and device level. It is observed that a band bending occurs in C8-BTBT layer with the insertion of C 60 , which induces a strong hole accumulation at the interface region, facilitating the formation of high concentration conducting channel when the interface is incorporated into OFETs. The strong acceptor C 60 may cause charge transfer from the trap states in C8-BTBT, resulting in a field-effect operation with decreased threshold voltage. However, the increasing disorder in C8-BTBT induced by the C 60 nano-interlayer may reduce the hole mobility at the C8-BTBT/SiO 2 interface region and change the growth model of C8-BTBT. In addition, as confirmed by the transfer characteristic of the OFETs, the thin C 60 insertion layer isn’t continuous enough to induce an ambipolar transport behavior despite its high mobility. The competition between the two opposite effects results in compromised performance in such OFETs. The device performance parameters deteriorate generally with increasing the C 60 nano-interlayer thickness. So, it is inferred that the C 60 interlayer alone cannot improve the performance of the C8-BTBT/SiO 2 -based OFETs without further optimization. Importantly, the device performance exhibits an abnormal improvement with a 6 nm C 60 interlayer, which might be ascribed to a higher energy level shift of C8-BTBT caused by a quasi-continuous C 60 film at this thickness.
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Analytical Methods
·
2021
·Vol. 13
·期 5
·712-718
·
IF 2.896
Jing Liu,Tianze Wang,Bo Xiao,Muhan Deng,Peng Yu,Taiping Qing
The breast cancer 1 (BRCA1) gene is a tumor suppressor gene, whose mutation is closely related to breast cancer. Therefore, the sensitive detection of the BRCA1 gene is extremely important for human health, particularly for women. In this study, a label-free fluorescent method based on hairpin DNA-templated copper nanoclusters (CuNCs) was for the first time developed for the detection of the BRCA1 gene. In the absence of target DNA, the detection system showed a strong red emission and produced a high emission peak. However, in the presence of the BRCA1 gene, the DNA probe hybridized with the BRCA1 gene and conformation of the DNA probe changed. As a result, the amount of produced CuNCs decreased and a low emission peak was obtained. The fluorescence intensity of the detection system was linearly correlated with the concentration of the BRCA1 gene ranging from 2 nM to 600 nM. The detectable limit was 2 nM for the BRCA1 gene assay, which was comparable with those reported by other non-amplifying sensors. Moreover, the developed method showed satisfactory recoveries for the BRCA1 gene assay in the bovine serum. The DNA-templated CuNC-based fluorescent assay thus offered a promising platform for the diagnosis of a breast cancer biomarker.
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