CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 67
·16670-16681
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IF 5.236
Xinyu Zou,Rui Shi,Zhijuan Zhang,Guoyuan Fu,Lei Li,Li Yu,Yurun Tian,Fang Luo
Graphical A heterojunction material combined with polyoxometalate is designed to remove complex pollutants from water. The results of the experiments show that a material with such structure has good photoreduction property for Cr(VI) and adsorption property for organic cation dyes. Wastewater treatment is of great significance to environmental remediation. The exploration of efficient and stable methods for wastewater treatment is still a challenging issue. Herein, a heterojunction material with photocatalysis and adsorption properties has been designed to remove the complex pollutants from wastewater. The heterojunction material (ZnO/TiO 2 −PW 12 , PW 12 =[PW 12 O 40 ] 3− ) was synthesized by calcining the ZnTi−layered double hydroxide (ZnTi-LDH) intercalated with the Keggin-type polyoxometalate H 3 PW 12 O 40 . In the construction of ZnO/TiO 2 −PW 12 it was found that the polyanionic PW 12 remained unchanged in the process of forming the proposed heterojunction. The photochemical properties verify that heterojunction synergistic with PW 12 facilitated the separation of photoproduced electron-hole pairs and thus suppressed the recombination. Therefore, ZnO/TiO 2 −PW 12 exhibits excellent photocatalytic property, and the efficiency of Cr(VI) photoreduction reached more than 90 % in the first 3 min. Furthermore, the electrostatic force between the PW 12 and cationic dyes makes ZnO/TiO 2 −PW 12 having an outstanding adsorption performance for cationic dyes, such as rhodamine B, crystal violet and methyl blue. Such heterojunction material combined with polyoxometalate puts forward new insights for the design of functional materials for water treatment with low cost and high efficiency.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2016
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IF 4.012
Wenwen Ma,Yan Xu,Kaiwen Ma,Hong Zhang
H 3 PW 12 O 40 /TiO 2 (abbreviated PW 12 /TiO 2 ) nanofibers catalysts have been successfully prepared via calcinating off the respective electrospun PVP/[PW 12 + Ti(OC 4 H 9 ) 4 ] composite nanofibers for the first time and they show ultra-deep desulfurization catalytic performance in mild conditions. PW 12 /TiO 2 nanofibers consist of anatase phase TiO 2 and Keggin structure PW 12 , the diameter of which is approximately 100 nm. Compared with PW 12 /TiO 2 nanoparticles, 40 wt.% PW 12 /TiO 2 nanofibers (the weight percentage of PW 12 loading on TiO 2 nanofibers was 40%) exhibited the higher catalytic activity under the same conditions. DBT could be removed completely within 30 min at 70 °C using 0.02 g 40 wt.% PW 12 /TiO 2 nanofibers as catalysts, when ionic liquid (IL) [Bmim]PF 6 was as extraction agent. Additionally, sulfur removal of different substrates decreased in the following orders: DBT > BT > 4,6-DMDBT under the same conditions. Even after 5-times recycling, the catalytic activity of 40 wt.% PW 12 /TiO 2 nanofibers was not significant decreased. As a total result, these novel PW 12 /TiO 2 nanofibers can be used to deeply desulfurize in the industry.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 89
·73083-73090
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IF 3.84
Kuiyi You,Renjie Deng,Jian Jian,Pingle Liu,Qiuhong Ai,He’an Luo
Developing a new environmentally friendly process for benzene nitration to nitrobenzene has been highly desirable for a long time. In this work, NO2 was used as a nitration agent to replace traditional nitric acid, and different mesoporous SiO2 and their supported heteropoly acid (salt) were employed to catalyze benzene nitration to nitrobenzene. Several typical catalysts were characterized using XRD, BET and FT-IR, and the acid amounts of the various catalysts were determined. The effects of various factors such as different catalysts, the molar ratio of benzene to NO2, reaction temperature, reaction time, HPW loading, the acid amounts of the catalyst and the reuse of the catalyst on the nitration reaction have also been systematically examined. The results indicate that the supported HPW/MCM-41 catalysts exhibit a remarkably synergistic catalytic performance on the nitration reaction of benzene to nitrobenzene. In particular, the 50%HPW/MCM-41 catalyst gives the best results with 73.4% benzene conversion and 98.8% selectivity to nitrobenzene under the optimal reaction conditions. Moreover, the mesoporous structure of MCM-41 was retained under the high loading of HPW. The possible reaction mechanism for the nitration reaction of benzene with NO2 over HPW/MCM-41 is suggested in the present work. This method provides a promising strategy for the preparation of nitro-aromatic compounds from a catalytic nitration reaction by using NO2 as the nitration reagent.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2015
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IF 3.368
Xiaole Weng,Xiaoxia Dai,Qingshan Zeng,Yue Liu,Zhongbiao Wu
Heteropoly acids (HPAs) have been effectively utilized in selective catalytic reduction (SCR) of NO to improve the NH 3 absorption capacity and alkaline/alkali metal resistance for SCR catalysts. However, despite the promise on super-acidities, their other properties that would work on SCR process are still lack of exploration. In this study, a 12-tungstaphosphoric acid (H 3 PW 12 O 40 , HPW) was selected to modify a well-reported CeO 2 catalyst. The resulted CeO 2 /HPW catalyst was subsequently utilized for SCR of NO with excess NH 3 , which revealed a significantly promoted performance in SCR reaction. DRIFT analyses showed that the unique NO 2 absorption capacity of HPW could prevent the NO 2 being further oxidized into nitrate species and the abundant Brønsted acid sites could effectively retain the NH 3 , avoiding them being over-oxidized at evaluated temperatures. The presence of NO 2 was demonstrated able to induce a so called “fast SCR” reaction over the CeO 2 /HPW catalyst, which effectively facilitated the SCR reaction. Furthermore, we have also constructed a CeO 2 @HPW catalyst, which showed an enhanced SO 2 poisoning resistance in SCR reaction.
研究领域:
环境科学
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催化化学
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DOI
PubMed
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Fengjiao Lai,Feng Yan,Pengju Wang,Chunyan Li,Xuehua Shen,Zuotai Zhang
The development of heterogeneously functional catalysts is of great significance in selective catalysis for biomass valorization. Herein, we report for the first time the applicability of chitin/Ag co-modified H 3 PW 12 O 40 composites (Chx-AgPW) as catalysts for producing valuable furans from carbohydrates and biomass. The as-prepared Ch15-AgPW catalyst exhibited the best catalytic performance, due to the dual Brǿnsted-Lewis acidity and appropriate chitin content. When the amount of Ch15-AgPW catalyst was 0.25 mmol, an excellent 5-hydroxymethylfurfural (HMF) yield of 78.3% could be achieved at 150 °C for 3 h with nearly 100% glucose conversion in the H 2 O/MIBK (V H2O:MIBK = 4:6) solvent system. Furthermore, high-yield HMF could also be obtained from other carbohydrates such as fructose (85.3%), sucrose (72.3%), cellobiose (65.6%), starch (52.7%) and inulin (43.5%). Additionally, corn stover , rice straw and sugarcane bagasse under typical reaction conditions simultaneously produced furfural and HMF in yields of 64.6%–72.2% and 18.5%–25.6%, respectively. Combined with the characterization, mechanism study demonstrated that the surface functional groups in chitin were conductive to rapid absorption of the substrates; the Brǿnsted acid sites from heteropoly anion (H 2 [PW 12 O 40 ] - ) promoted the initial depolymerization of biomass and the final dehydration to furans; the introduction of Ag + favored the isomerization of intermediates. After reaction finished, the Ch15-AgPW catalyst could be easily recovered by filtration and effectively reused at least eight cycles without substantial loss in catalytic activity . This work provides a novel strategy to synthesize stable heterogeneous catalysts with tunable acidity for producing bio-based fuels and chemicals from renewable resources .
研究领域:
化学工程
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可再生资源利用
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DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2013
·Vol. 2013
·期 31
·5428-5435
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IF 3.12
Shi Li,Shang-Ru Zhai,Jian-Ming Zhang,Zuo-Yi Xiao,Qing-Da An,Ming-Hui Li,Xiao-Wei Song
Graphical A novel, magnetically recoverable, and stable catalyst, Fe 3 O 4 @SiO 2 –NH 2 /HPW@CS/HPW, has been prepared and a high methyl oleate yield of 93.2 % was achieved in the esterification of methanol and oleic acid. A magnetically retrievable and stable composite, Fe 3 O 4 @SiO 2 –NH 2 /HPW@CS/HPW, in which H 3 PW 12 O 40 (abbreviated as HPW hereafter) was successfully anchored onto the surface of a cross-linked chitosan coating on magnetic Fe 3 O 4 cores, has been prepared by means of chemical bonding between the amino and HPW components. The resultant composites were characterized by different physicochemical techniques, such as TEM, SEM, FTIR, and vibrating sample magnetometry (VSM). An improved synthesis of methyl oleate from oleic acid and methanol was observed with the as-prepared material as catalyst with easy recovery by simply using an external magnet. A yield of 93.2 % of methyl oleate was achieved under the optimal reaction conditions, that is, a 20:1 molar ratio of methanol to oleic acid and 0.4 g catalyst at 60 °C for 4 h. It was demonstrated that improved catalytic performance and facilitated separation were simultaneously achieved in the esterification reactions as a result of the core@shell structures in which stabilized HPW and magnetic cores are integrated into one body.
研究领域:
材料科学
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催化
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纳米技术
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化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 1
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IF 1.64
Chongjing Liao,Tao Fang,Shanshan Luo,Guo-Zhi Fan,Guangsen Song
The preparation of partial acetylation of cellulose derived from rice straw was catalyzed by phosphotungstic acid with various numbers of crystal water, and H 3 PW 12 O 40 ·4H 2 O was found to be as effective catalyst. The yield of the cellulose acetate was significantly enhanced by converting cellulose directly isolated from rice straw into microcrystalline cellulose before acetylation. The optimization of the acetylation was investigated by varying the amount of catalyst and acetic anhydride as well as reaction conditions including reaction time and medium, and a degree of substitution (DS) value of 2.29 and yield of 62.9% were obtained under the optimized conditions. The structure and the formation of the acetylated product were confirmed by Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD) technique, the thermal properties were determined by thermal analysis including thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC), and the morphology was observed by scanning electron microscope (SEM). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41212.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Yaling Luo,Changjun Liu,Hairong Yue,Siyang Tang,Yingming Zhu,Bin Liang
The selective oxidation of cyclopentene by aqueous H 2 O 2 using H 3 PW 12 O 40 and tetrabutyl ammonium bromide (TBAB) as a phase transfer catalyst has been investigated. The results show that the presence of TBAB significantly improved the oxidation selectivity of cyclopentene. The effects of the reaction conditions on the conversion of cyclopentene were investigated in detail. The optimal reaction conditions are as follows: the H 3 PW 12 O 40 to TBAB molar ratio, 1:1–1:3; H 3 PW 12 O 40 to cyclopentene molar ratio, 0.54:100–0.64:100; and molar ratio of H 2 O 2 to cyclopentene, 1.6:1. The conversion reached to 59.8% in 4 h at 35.0 °C, while the selectivity of glutaraldehyde was 38.0% and the selectivity of 1,2-cyclopentanediol was 55.6%. In addition, a route for oxidation of cyclopentene by aqueous H 2 O 2 using a heteropoly acid and quaternary ammonium salt as a phase transfer catalyst was proposed.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
FUEL
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2023
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IF 7.4
Wei Wang,Jiaru Zhougu,Chunlai Liu,Na Wang,Songlin Shi,Zelong Liu,Peihang Shen,Fengwei Shi,Jianglei Hu
Biodiesel production by catalytic esterification over solid acid catalysts offers a promising approach for finding alternatives to fossil fuels. In this work, ethylene-bridged organosilicon nanotubes (Si(CH 2 -CH 2 )Si-NTs) loaded with phosphotungstic acid (HPW), named HPW@Si(CH 2 -CH 2 )Si-NTs, were synthesised for the first time by a one-pot method using P105 (EO 37 PO 56 EO 37 ) as a singlemicelle template at 16 °C. The composites were characterized by SEM, TEM, N 2 adsorption–desorption, FT-IR, wide-angle XRD, and solid-state NMR spectrum. All test results proved that HPW were uniformly dispersed in the unique hollow nanotubes. Finally, 60 mg of 0.7HPW@Si(CH 2 -CH 2 )Si-NTs(C) were applied to catalyze the esterification reaction of oleic acid with methanol at 120 °C for 10 h, and the conversion of oleic acid and yield of methyl oleate reached 94.7%. After five reused, the catalytic activity did not decrease significantly, indicating that the composites had high hydrothermal stability and recycling performance.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
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2026
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IF 2.6
Mingyang Song,Zelin Meng,Songyang Li,Jianglei Hu,Xi Li
A bifunctional catalyst comprising ordered Ti-mesoporous silica supported H 3 PW 12 O 40 (PW/OMS-Ti) was synthesized via a one-pot hydrothermal method. The composite features well-dispersed Brønsted and Lewis acid sites within an ordered mesoporous framework. Under optimal conditions, the 0.5PW/OMS-Ti0.05 catalyst achieved 99.0% cellulose conversion with 67.0% total reducing sugar and 19.1% 5-HMF yields, demonstrating effective synergistic catalysis. The catalyst also exhibited excellent stability and recyclability over five cycles, highlighting its potential as an efficient solid acid catalyst for biomass conversion.
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DOI
高影响因子
Arabian Journal of Chemistry
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2018
·
IF 2.969
Du Yue,Jiaheng Lei,Lina Zhou,Xiaodi Du,Zhenran Guo,Junsheng Li
Ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 nanocomposites with high specific surface areas were prepared using cationic surfactant and monodispersed polystyrene spheres (PS) as dual-template. The characterization results of scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, and small-angle XRD patterns confirmed the existence of ordered meso/macroporous structure and the wide-angle XRD patterns, Fourier transform infrared spectroscopy (FTIR), X-ray photoemission spectroscopy (XPS) measurements suggested the high dispersivity of the Keggin-type heteropolyacid (HPA) on silica matrix. There was an optimum value of cationic surfactant usage and proper calcination temperature of ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst leading to ultra-high specific surface areas. Furthermore, the ordered meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst was evaluated for ultra-deep oxidative desulfurization (ODS) of cyclic sulphur-containing compounds using hydrogen peroxide (H 2 O 2 ) as oxidant. Under optimum reaction conditions, dibenzothiophene (DBT) could be removed within 100 min at 30 °C by meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst. The excellent catalytic activity should be attributed to the combination of ordered meso/macroporous architecture and high surface area of H 3 PW 12 O 40 /SiO 2 catalyst which promoted the mass transport of reactants and products in the pore channel and provided more accessible catalytic active sites. In addition, the meso/macroporous H 3 PW 12 O 40 /SiO 2 catalyst showed good stability with only 1.9% efficiency decreased after 6 cycles.
研究领域:
化学工程
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
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IF 4.5
Zhi Qi,Chunlai Liu,Peihang Shen,Zelong Liu,De Sun,Jianglei Hu,Yibo Zhang
With the accelerated consumption of fossil fuels driven by societal development and population growth, acid-catalyzed biodiesel serves as an eco-friendly alternative that effectively enhances reaction processes and reduces pollutant emissions. This study developed a novel dual-acid catalyst, H 3 PW 12 O 40 (PW) and titanium-incorporated phenolic resin (PR) functionalized mesoporous silica (PW/Ti-SiO 2 -PR), via a one-pot hydrothermal method for efficient biodiesel production via oleic acid esterification. The composite’s structure, acidity, and hydrophobicity were systematically characterized using FT-IR, XRD, N 2 physisorption, SEM/TEM, and XPS. Results confirmed the successful integration of PW and Ti into the silica framework, creating synergistic Brønsted (PW) and Lewis (Ti 4 + ) acid sites. The inclusion of low-molecular-weight PR enhanced mesopore formation and hydrophobicity, critical for inhibiting water-induced deactivation. The optimized 0.2PW/Ti0.05-SiO 2 -PR0.25 catalyst achieved 95.2 % methyl oleate yield at 100 °C within 8 h, outperforming conventional solid acids. Notably, the catalyst retained > 90 % activity over five cycles without PW leaching or structural degradation, demonstrating exceptional stability. This work highlights the strategic design of hydrophobic, dual-acid mesoporous catalysts for sustainable biodiesel synthesis.
研究领域:
催化化学
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能源材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）