CATALYSIS TODAY
·
2017
·
IF 4.636
Wenwu Zhou,Qing Zhang,Yasong Zhou,Qiang Wei,Lin Du,Sijia Ding,Shujiao Jiang,Yanan Zhang
USY zeolites have been modified by incorporation of gallium, phosphorus and a combination of gallium and phosphorus by wetness impregnation method using gallium nitrate and ammounium phosphate diabasic, and the corresponding NiMo supported hydrodesulfurization (HDS) catalysts have been prepared for HDS of an inferior FCC diesel. The individual physical-chemical properties of the modified USY zeolites and the series NiMo supported catalysts were characterized using XRD, N 2 -adsorption-desorption(BET), NH 3 -TPD, Py-FTIR, H 2 -TPR, HRTEM and XPS methods, and their catalytic performances for an inferior FCC diesel HDS were assessed. The results show that both gallium and phosphorus modification can modulate the acid property of USY zeolite and weaken the interaction between the active metal and the supports, thus enhancing the degree of sulfidation and the dispersion of Mo species that are beneficial for the HDS of highly refractory organosulfur compounds. The highest HDS and HDN efficiencies of 99.7% and 99.6%, respectively, were observed over the catalyst containing the PGaUSY zeolite. More importantly, gallium modification of the USY zeolite promotes the hydrodesulfurization of all organosulfur compounds, and especially 4,6-DMDBT, in the FCC diesel and phosphorus modification of the USY zeolite promotes the hydrodesulfurization of most organosulfur compounds except for 4,6-DMDBT in the FCC diesel.
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JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Nan Wang,Yuanyuan Huang,You Zi,Mengke Wang,Weichun Huang
A practical and regioselective direct N-alkylation of 2-pyridones is enabled by use of α-keto esters in the P(NMe2)3-mediated deoxygenation process. The reaction proceeds under mild conditions to produce N-alkylated 2-pyridones with high selectivity and generality, and the protocol is shown to be applicable for the scale-up synthesis, which makes it promising for practical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hong-Mei Fu,Xi-Peng Zhang,Shi-Chao Qi,Ding-Hua Liu
The p -chlorotoluene (PCT) and m -chlorotoluene (MCT) are indispensable chemical intermediates in pharmaceuticals, agrochemicals, and material synthesis. However, the similar physical and chemical properties of the PCT and MCT make their efficient separation a severe challenge in the current chemical separation field. In this study, a metal-organic framework named Mn-dhbq (dhbq = 2,5-dihydroxy-1,4-benzoquinone) is employed to achieve highly efficient separation of PCT/MCT in a solvent system with 1,3,5-trimethylbenzene. The Mn-dhbq exhibits the adsorption capacity of 208 mg/g for PCT and 72 mg/g for MCT at 25 °C, with initial concentration of 20 % for both PCT and MCT. Notably, the dual-site Langmuir-Freundlich selectivity is 38 with the concentration of 1 % for PCT and MCT. Density functional theory (DFT) calculations reveal differences in the amount of charge transfer and interaction sites between the framework and adsorbate, and these factors collectively contribute to the selective separation of PCT and MCT by Mn-dhbq.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Huimei Mo,Zhanhong Chen,Xiaoying Liao,Shiting Liang,Jin Xu,Haolang Zeng,Shuqian Shen,Junhui Yi
Morphology engineering and heteroatom doping are established strategies for developing high-performance photocatalysts. In this study, phosphorus-doped three-dimensional porous g-C₃N₄ nanosheets were synthesized by calcining melamine–cyanuric acid supramolecular precursors, followed by gas-phase phosphidation using NaH₂PO₂ at 300 °C. The optimized material exhibited exceptional photocatalytic activity, achieving over 99 % Rhodamine B degradation within 40 min under visible light, significantly outperforming undoped 3D and bulk g-C₃N 4 . It also showed the highest photocurrent density and prolonged carrier lifetime, indicating enhanced charge separation. The catalyst maintained >90 % efficiency after four cycles, demonstrating remarkable stability. Mechanistic studies revealed that holes and superoxide radicals serve as the primary active species, with hydroxyl radicals also participating. The enhanced performance is attributed to the synergistic effect of P-doping—which modifies the electronic structure—and the 3D porous framework, which facilitates mass transfer and exposes active sites. This work provides a scalable route to efficient photocatalysts for environmental remediation.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Huihui Bao,Wenzheng Nie,Yingchun Liu,Linglan Men,Mingzheng Ren,Changlei Xia,Huan Xie
The electrochemical CO 2 reduction (ECO 2 R) driven by the renewable energy represents an effective approach to mitigate atmospheric CO 2 concentration and to achieve carbon neutrality. Zinc (Zn) and its oxides, being among the most abundant metal materials, are frequently employed in the generation of CO by ECO 2 R. Cooper and its oxides have the moderate *CO affinity which enables the C-C coupling reaction to produce the higher value C2+ products. In this work, we have developed the novel CuO/ZnO p-n heterojunction tandem catalyst using a straightforward solvothermal method. By optimizing the content of CuO/ZnO heterojunction, a maximum Faradaic efficiency of 37% for C 2 H 4 can be achieved in a gas diffusion flow cell, which is one of the highest among the Cu-Zn-based catalysts for ECO 2 R. Mechanism investigations illuminate that CuO/ZnO heterojunction interface enhances the adsorption of *CO 2 – intermediates facilitating the formation of *CO intermediates than pristine CuO, meanwhile weakens the adsorption of *H impeding the competitive hydrogen evolution reaction. Therefore, the spillover of CO from ZnO to CuO sites and the electrons rebalance on CuO/ZnO heterojunction interface promote the C-C coupling reaction rates, thus greatly enhances the selectivity for C 2 H 4 .
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POULTRY SCIENCE
·
2025
·
IF 4.2
Xirui Xia,Huifang Zhao,Yaxi Li,Xiangyang Long,Xuezhen Liu,Mingyang Bai,Youzhi Tang,Xiangguang Shen,Huanzhong Ding
Mycoplasma gallisepticum ( M. gallisepticum , MG ) is the primary pathogen of chronic respiratory disease ( CRD ) in chickens and leads to pneumonia and air sacculitis in infected chickens and a corresponding economic loss for the poultry industry. The pleuromutilins have excellent anti-mycoplasmal activity and we evaluated the in vivo activity of a new derivative 22-((4-((2-furan-1-yl)acetamido)phenyl)thio) deoxypleuromutilin ( p- furoylamphenmulin ) against M. gallisepticum . A plasma pharmacokinetic ( PK ) study and an in vivo pharmacodynamic ( PD ) study of p -furoylamphenmulin were performed using an M. gallisepticum -infected chicken model. Based on the PK/PD results, a preliminary recommended dose was calculated. The minimum inhibitory concentration ( MIC ) of p -furoylamphenmulin against M. gallisepticum was 0.001953125 μg/mL. PK results indicated that the absorption half-life ( T 1/2ka ) in infected chicks was 0.10 h, elimination half-life ( T 1/2kel ) was 4.23 h. The areas under the concentration-time curve at 24h ( AUC 24h ) for 5, 40, and 80 mg/kg single-dose injections were 1.49, 10.15, and 18.56 μg·h/mL, respectively. The peak concentrations ( C max ) of 5, 40, and 80 mg/kg were 0.56, 5.79, and 9.53 μg/mL, respectively. The PD results indicated that at doses of 70 and 80 mg/kg, the mycoplasmal counts in lungs decreased by 3.39 and 3.28 Log 10 CFU/mL, respectively, achieving a bactericidal effect. Through PK/PD fitting, the target values corresponding to reducing the lung mycoplasma load by 3 Log 10 CFU/mL of AUC 24h /MIC and C max /MIC were 8288.29 h and 4299.30, respectively, and the calculated dosage using formula (2) was 62.64 mg/kg, under the regimen of intramuscular injection once every 24 h for 3 consecutive days. In addition, the effect of high-dose p -furoylamphenmulin on the relief of air sac lesions was significant. These results provide a basis for developing and applying p -furoylamphenmulin and provide a preliminary medication regimen.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Xudong Wang,Yanyang Wu,Tianyou Wang,Bin Wu,Kui Chen,Lijun Ji
M-cresol and p-cresol, typically produced as mixtures in industrial processes, are crucial chemical intermediates. However, their separation is challenging due to their similar structures and properties. ZSM-5 zeolite has shown potential as an adsorbent for separation, while the performance is yet to be improved. In this study, ZSM-5-F(x) was synthesized via hydrothermal method, incorporating F − ions during the synthesis process. The adsorption behaviour of m-cresol and p-cresol on ZSM-5-F(x) was investigated through static experiments, with ZSM-5-F(8) demonstrating the highest selectivity (9.01). Both ZSM-5-F(0) and ZSM-5-F(8) were characterized using XRD, scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) techniques. In addition, the introduction of F − ions increased the material's electronegativity, as demonstrated by the change in zeta potential from 53.22 to −45.93 mV. Single-component adsorption of m-cresol or p-cresol on ZSM-5-F(0) and ZSM-5-F(8) respectively were investigated in detail. The adsorption of m-cresol on ZSM-5-F(8) showed a non-monotonic phenomenon with a significant decrease after 0.06 mol/L. The thermodynamic parameters including Δ G , Δ H , and Δ S were calculated accordingly. All the values |Δ G |, |Δ H |, and |Δ S | of both components on ZSM-5-F(8) were greater than those on ZSM-5-F(0), suggesting that the introduction of F − ions facilitated the adsorption. Competitive adsorption experiments on both ZSM-5-F(0) and ZSM-5-F(8) were conducted at 298.2 K. The results indicated that the selectivity α p/m on ZSM-5-F(8) increased with increasing initial concentration and laid between 13 and 14. After seven consecutive regeneration cycles, the selectivity (α p/m ) only decreased to 13. This study suggests that ZSM-5-F(8) could be a promising adsorbent for m-cresol and p-cresol in industrial applications.
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Small
·
2025
·
IF 12.1
Jiafu Shen,Yu Dai,Fan Xia,Xiaojin Zhang
Low-grade heat accounts for a significant portion of the heat, but is often overlooked and not utilized. Ionic thermoelectric generators (i-TEGs) are an ideal choice for harvesting low-grade heat due to their simple design and operation. However, challenges such as ion mobility regulation and the need for series integration still hinder their performance. In this work, an interesting approach is introduced to improve the thermoelectric efficiency of i-TEG by utilizing ion-selective hydrogels containing sodium chloride (NaCl). The anionic polymer in the cation-selective hydrogel is attractive to sodium ions, while the cationic polymer in the anion-selective hydrogel is attractive to chloride ions. This regulates the thermal mobility of ions in the hydrogel without polymer modification or the addition of some additives, thus enhancing or changing the Seebeck coefficient ( S ). By connecting 12 pairs of the P-type and N-type i-TEGs, a voltage of 1.54 V and an output power of 21 µW can be achieved on the surface of the body skin. This work opens a new horizon for obtaining high-performance i-TEGs through ion mobility regulation by ion-selective hydrogels, and highlights the prospect of P-N series integrated i-TEGs from hydrogels for body heat harvesting.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Xiao-Chao Chen,Tian Lan,Kai-Chun Zhao,Lin Guo,Yong Lu,Ye Liu
Tandem hydroaminomethylation (HAM) represents one of the most important catalytic protocols for the one-pot synthesis of amines using low-cost and widely available olefins, syngas and amines as starting materials. In this work, the applied P,O-hybrid ligand containing phosphino-fragment and carboxylic group [ L1 , 2-(diphenylphosphino)benzoic acid] could stoichiometrically react with Rh(acac)(CO) 2 to afford a stable Rh-complex of Z [dicarbonyl-2-(diphenylphosphino)benzoato rhodium(I)], wherein the more substantial P,O-chelation derived from L1 as a bidental pincer upon deprotonation as well as the thermodynamically favored six-membered ring structure warranted its stability. It was found that Z could serve as a highly active catalyst to accelerate the reaction rate of each individual step in the HAM, advantageous with the completely inhibited side-reaction of olefin-hydrogenation. The in situ high-pressure FT-IR spectral analysis demonstrated, for the first time, that the involvement of L1 greatly facilitated the formation of two kinds of the active Rh-H intermediates ( A′ and A , v 2012 and 2043 cm −1 ) with well-maintained longevity. And the DFT calculations further confirmed that the Rh-complex of Z exhibited exclusive ability to activate H 2 , resulting in the efficient formation of Rh-H intermediates of A′ and A , the later ( A ) was responsible for rapid olefin-hydroformylation, and the former ( A′ ) was in charge of imine-hydrogenation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chaoge Zhou,Fanqi Meng,Ke Chen,Xueli Yang,Tianshuang Wang,Peng Sun,Fangmeng Liu,Xu Yan,Kengo Shimanoe,Geyu Lu
In this work, we successfully prepare the octahedral NiO/Zn 2 SnO 4 p-n heterostructure by a simple hydrothermal synthesis and subsequent wet impregnation process. The microscopic morphology characterization results show that the as-prepared composites are uniformly dispersed and have an octahedral structure with a size of 3−5 μm. The gas devices are fabricated and their sensing performances are investigated systematically. The response and selectivity of NiO/Zn 2 SnO 4 composites to acetone have been significantly improved than that of pure Zn 2 SnO 4 . Moreover, the response of the sensor to 100 ppb acetone is 1.4 at 300 °C, indicating that the detection limit is less than 100 ppb. The enhancement in sensing properties of composites is largely due to the p-n heterojunction formed by NiO and Zn 2 SnO 4 , which causes the transfer of carriers and the catalytic effect of NiO.
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RSC Advances
·
2018
·Vol. 8
·期 62
·35353-35359
·
IF 2.936
Yanyan Zheng,Chengyan Liu,Lei Miao,Hong Lin,Jie Gao,Xiaoyang Wang,Junliang Chen,Shaohai Wu,Xin Li,Huanfu Cai
As promising candidates for the progress of low-temperature thermoelectric devices, MgAgSb-based thermoelectric materials have drawn a great deal of attention. However, due to complicated phase changes, high content of impurities and high volatilization of Mg, it is difficult to synthesize pure phase MgAgSb-based thermoelectric materials via conventional methods. Here, MgAgSb alloy was successfully synthesized by a combination of common planetary ball milling and spark plasma sintering. Furthermore, the introduction of Zn improved the purity of alloys, leading to optimization of the electrical transport properties. As a result, the power factor was improved from 1087 μW m−1 K−2 for MgAg0.9Sb0.95 to 1394 μW m−1 K−2 for Mg0.97Zn0.03Ag0.9Sb0.95 at 473 K, and the ZT reached ∼0.7 at 473 K. These results suggest that MgAgSb-based thermoelectric materials have a good thermoelectric application potential and this study can be used as guidance for the synthesis and performance improvement of other thermoelectric materials. Our synthesis route sets forth a new avenue for accelerating commercial applications of MgAgSb-based thermoelectric power generation or refrigeration.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Guo Liu,Qi Zeng,Xinyi Sui,Shuhao Tian,Xijuan Li,Qingfeng Wu,Xukun Wang,Kun Tao,Erqing Xie,Zhenxing Zhang
The commercialization of lithium-sulfur battery (LSB) is seriously limited by the shuttling effect and sluggish reaction kinetics. Metal chalcogenides have been widely used as catalysts to enhance electrochemical performance, but the modulation essence of these non-metal anions is unclear. Herein, cubic manganese chalcogenides (MnO, MnS, MnSe) with fixed cation (Mn) and various anions (O, S, Se) are synthesized, and the anion effect on the performance of LSBs is systematically investigated. Based on the complementary experimental characterization and advanced theoretical calculations, it is clear that the interfacial redox reaction dynamics are governed by the catalytic activity of manganese chalcogenides, while the catalytic activity is modulated by the gap between the d-band of cation and p-band of anion (Δd-p). Among these manganese chalcogenides, Se has the largest atom radius and lowest electronegativity , which makes the p-band center of Se move to the Fermi level , thus increasing the electron's energy to react. Consequently, the LSBs based on MnSe catalyst exhibit the best rate (613.5 mAh g −1 at 4C) and cyclic performance (847.5 mAh g −1 after 250 cycles at 0.2C). This comparative study may encourage more effort and provide a new paradigm for developing highly effective catalysts for high-performance LSBs.
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