INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Mingyan Chen,Dehua Zhang,Ziying Wang,Yao Zhang,Yucheng Liu
UiO-66 loading carboxyl and phosphotungstic acid has a good affinity to thiophene (TH). The synthesized catalyst, changed its original structure, which can increase its reactive site and enhance the interaction with thiophene (TH) in order to improve the adsorption performance. Then the structural changes were analyzed by XRD, FT-IR, SEM, BET, EDS and other characterization methods. Through static experiments of adsorption desulfurization, it is found that when the adsorption time is 240 min, the adsorption temperature is 30 ℃ and the oil-to-agent ratio is 100:1, the adsorption effect: UiO-66-(COOH) 2 (UC2) > UiO-66, the highest adsorption capacity can reach 89.99 mg/g; while PTA@UiO-66 (PAU) can reach adsorption equilibrium at 210 min, it has better desulfurization performance than UiO-66. After being recycled for 5 times, the adsorption effect is only slightly decreased: the adsorption capacity of UC2 was still 78.02% of the initial adsorption capacity, while that of PAU was 76.07% of the initial adsorption capacity. According to the adsorption kinetics, the adsorption process of thiophene on the adsorbent UC2 is more consistent with W-M model, and the adsorption of PAU is more in line with the pseudo-first order kinetic equation. In addition, it also includes the process of intraparticle diffusion and liquid film diffusion.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2015
·Vol. 5
·期 4
·1897-1910
·
IF 2
Shiqiang Zhao,Guizhuan Xu,Chun Chang,Shuqi Fang,Ze Liu,Fengguang Du
A series of metal-modified phosphotungstates were prepared and performed for direct synthesis of ethyl levulinate from fructose in ethanol. Considering the cost of catalysts, catalytic activity of catalysts, and easy separation of catalysts together, K-HPW-1 was chosen as the most suitable catalyst for synthesis of ethyl levulinate from fructose. A high ethyl levulinate yield of 64.6 mol% was obtained at 150 °C within 2 h in ethanol. The introduction of low polar toluene as a co-solvent improved the yield of ethyl levulinate to 68.7 mol%. The recovered catalyst remained high activity with the yield of ethyl levulinate converted from fructose above 50 mol% after being used five times. Moreover, the generality of the catalyst was further demonstrated by glucose, sucrose, inulin, and cellulose with ethyl levulinate yielding 14.5, 35.4, 52.3, and 14.8 mol%, respectively.Keywords:ethyl levulinate;carbohydrates;potassium phosphotungstate
研究领域:
催化化学
·
可再生化学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2017
·
IF 2.605
Yulong Liao,Zhongwei Zhao
A sulfuric-phosphoric acid leaching process for scheelite was developed. In the process, tungsten exists as a soluble phosphotungstic acid in the leachate. Thus, extracting tungsten from the solution is necessary. Considering the advantages of solvent extraction with oxygen-containing solvents, 2-octanol and tri-butyl phosphate (TBP) were employed to extract tungsten from phosphotungstic-sulfuric acid solutions. The impacts of phosphoric acid and ageing time on the extraction were primarily investigated. It was determined that for H 3 PW 12 O 40 solution with high H 2 SO 4 (49.71 g/L S) content, the WO 3 content in raffinates remained as low as 0.01 g/L after a single stage extraction even if the ageing time increased. However, if such solution contained high H 3 PO 4 (113.95 g/L P), the remaining WO 3 content increased to approximately 0.29 g/L after aged for 0.5 h. And, it further increased to 1.06 and 2.16 g/L after ageing for 24 h and 14 days. It indicated that phosphoric acid and ageing time played an anti-synergistic effect on the extraction. Furthermore, for the solution with abundant H 3 PO 4 aged for 0.5 h, the 31 P NMR results showed there were only the characteristic peak of H 3 PW 12 O 40 ( δ = − 16.24 ppm) and the peak of H 3 PO 4 ( δ = − 0.96 ppm). However, an unknown peak ( δ = − 2.80 ppm) appeared in the spectrum of such solution aged for two weeks and that of its raffinate. This finding implies that the combination reaction between phosphoric and phosphotungstic acid creates another species that is difficult to extract. Therefore, to obtain satisfactory extraction efficiency, the dosage of phosphoric acid should be controlled during the mineral decomposition stage.
研究领域:
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Shoulu Yang,Zhongwei Wang,Zhu Liu,Ning Ji,Yiqiang Wu
Hybrid wood is a composite with the advantages of both wood and inorganic material. Here, a novel hybrid wood was fabricated from wood and nanospheres by the in-situ assembly of phosphotungstic acid (HPW) and pyridine (PY) at room temperature. The uniformly distributed amphiphilic PY-PW nanospheres provided controllable particle size and acid properties by changing the HPW-PY molar. Examination under Scanning electron microscopy (SEM) showed the presence of a uniform nanosphere coating by the nanospheres, and FE-SEM/EDS showed even distribution on the cell walls. The successful synthesis of the nanospheres in the wood was confirmed by Transmission electron microscopy (TEM). The PY-PW/wood hybrid was also resistant to leaching, attributed to the amphiphilicity of the nanospheres. The hybrid wood also showed superior flame retardation, with a UL-94 V-0 rating, and significantly reduced the peak heat release rate (pk-HRR) and total smoke release (TSR) values of the untreated wood by 44.7 % and 51.7 %, respectively. The enhanced flame retardation was attributed to synergistic effects and catalytic carbon reactions resulting from high-density nitrogen/phosphorus/oxygen cross-linking in the carbon layer in the condensed phase and the removal of combustible gases by free radicals. This hybrid wood material has potential application for the development of fire-safe wood.
研究领域:
材料科学
·
林业工程
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产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Jie Zhu,Peiwen Wu,Linlin Chen,Jing He,Yingcheng Wu,Chao Wang,Yanhong Chao,Linjie Lu,Minqiang He,Wenshuai Zhu,Huaming Li
Construction of catalysts with integral structure for oxidative reaction process is an essential promotion to catalysts in industrial application. In this work, a 3D printing method was employed to prepare 3D printed spheres (3D-PSs), followed by carbonization to form 3D carbon spheres (3D-CSs). Then, a 3D-CSs supported phosphotungstic acid (HPW/3D-CSs) was prepared for deep oxidative desulfurization . Compared with traditional powder catalysts, the as-prepared catalyst is easy to be operated and separated from oil products. The supported catalyst possesses excellent catalytic performance and the removal of DBT , 4-MDBT and 4, 6-DMDBT in fuel oil, reaching ~100% of sulfur removal . The effects of various experimental parameters on desulfurization efficiency were considered to optimize reaction conditions. Moreover, the catalyst shows excellent thermal and chemical stability, with no obvious decrease in desulfurization activity after 5 cycles. GC–MS analysis indicates DBT sulfone was the solely oxidized product of DBT.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yi Gu,Yang Jiao,Ya Ruan,Jing Yang,Yaling Yang
Herein, a nanocomposite of Cu,Ce-containing phosphotungstates (Cu,Ce-PTs) with outstanding laccase-like activity was fabricated via a one-pot microwave-assisted hydrothermal method. Notably, it was discovered that both Fe 3+ and Cr 6+ could significantly enhance the electron transfer rates of Ce 3+ and Ce 4+ , along with generous Cu 2+ with high catalytic activity, thereby promoting the laccase-like activity of Cu,Ce-PTs. The proposed system can be used for the detection of Fe 3+ and Cr 6+ in a range of 0.667–333.33 μg/mL and 0.033–33.33 μg/mL with a low detection limit of 0.135 μg/mL and 0.0288 μg/mL, respectively. The proposed assay exhibits excellent reusability and selectivity and can be used in traditional Chinese medicine samples analysis.
研究领域:
生物化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Zhongwei Wang,Yan Qing,Zhu Liu,Shasha Wang,Yiqiang Wu,Shoulu Yang
In this work, we developed a new methodology for generating hybrid wood materials through the in-situ hybridization of phosphotungstic acid (HPW) and organic amines at ambient temperature. By selecting specific molecules of organic amines, this innovative process produces rod-like (imidazole) and spherical (triethylamine) amphiphilic organic-PW nanoparticles (NPs) with tunable particle sizes. The in-situ synthesis of organic-PW NPs within the wood was verified by series of methods for analysis. The resulting wood samples exhibited remarkable flame retardancy and smoke suppression, as demonstrated by successful fulfilment of the UL-94 test, a remarkable 60.1 % reduction in total smoke production, with a weight percent gain of only 7.5 %. Distinct profiles of the pyrolysis products were observed in the organic amine-PW-treated samples compared to pure wood, indicating a shift in the depolymerization pathway from levoglucosenone (LGO) to hydroxymethylfurfural (HMF) in the presence of acid catalyst. Notably, the thermal protection properties of imidazole-PW are higher than those of triethylamine-PW, attributed to the greater stability of cyclic phosphoric acid-imidazole complexes compared to linear phosphoric acid-triethylamine complexes. Our study not only presents an innovative approach to fabricate hybrid wood materials but also demonstrates exceptional flame-retardant and smoke-suppression capabilities, and altered pyrolysis pathways and evaluated intermediate products stability.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 8
·2293-2301
·
IF 3.186
Liu Xueping,Shi Shengbin,Yang Su,Gu Liuyu,Gao Lijing,Zhang Jin,Xiao Guomin
Using etherification to convert glycerol into biofuel additives is an effective way to solve the current problem of excess glycerol. In this study, a series of environmentally friendly (x)HPW/ZrO 2 catalysts were synthesized for the etherification of glycerol and tert-butyl alcohol (TBA). The internal microstructure and acidity analysis of the synthesized samples were derived from BET, XRD, Raman spectroscopy, FTIR, SEM, NH 3 -TPD and Py-FTIR. The results revealed that the synthesized catalysts retained the complete Keggin structure of phosphotungstic acid (HPW) which supported on it. The (15)HPW/ZrO 2 catalyst with suitable structure and acidity had an excellent catalytic effect on the etherification reaction. Driven by the (15)HPW/ZrO 2 catalyst, the optimal reaction conditions were determined from parameters of reaction temperature, time, molar rate of glycerol and TBA, and catalyst dosage. 93.2% glycerol conversion and 42.5% selectivity of multi-substituted tert-butyl glycerol ethers (DTBG + TTBG) were obtained under optimal conditions. In addition, even after a total of four consecutive reactions, (15)HPW/ZrO 2 catalyst still demonstrated relatively good catalytic activity. Graphic Abstract
研究领域:
催化化学
·
可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 1
·36
·
IF 3.8
Min Zheng,Xiangzhou Li,Dulin Yin,Steven R. Kirk,Hui Li,Peng Zhou,Yanhong Yang
Carveol is a rare fine chemical with specific biological activities and functions in nature. The artificial synthesis of carveol from plentiful and cheap turpentine is expected to further improve development of pharmaceutical and industrial applications. A new green catalytic system for the preparation of high-value carveol from α-epoxypinane is presented. A novel ammonium salt solid acid (AC-COIMI-NH4PW) was obtained from phosphotungstic acid bonded with imidazole basic site on nitrogen-doped activated carbon which, after ammonia fumigation, presented an excellent catalytic performance for the selective rearrangement of α-epoxypinane to carveol in DMF as solvent under mild reaction conditions. At 90 °C for 2 h, the conversion of α-epoxypinane could reach 98.9% and the selectivity of carveol was 50.6%. The acidic catalytic sites exhibited superior durability and the catalytic performance can be restored by supplementing the lost catalyst. Based on the investigation of catalytic processes, a parallel catalytic mechanism for the main product was proposed from the rearrangement of α-epoxypinane on AC-COIMI-NH4PW.
研究领域:
化学工程
·
材料科学
·
有机合成
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Tuodong Xiong,Wanxiong Yong,Na Chen,Guodong Fu
Photochromic materials have recently attracted widespread attention in the research of smart windows because they can function without additional devices. In this study, an innovative photochromic thermal insulating hybrid film based on a polyurethane matrix was prepared via a one-pot method, incorporating phosphotungstic acid. The film demonstrates excellent transparency, good mechanical strength, and a significant modulation of the solar spectrum, transitioning from colorless to dark blue under sunlight without the need for additional electron donors. This photochromic behavior is reversible and reproducible without degradation, resulting in a transmittance variation of up to 71 % at 550 nm, which is the most sensitive to the human eye, and more than 50 % modulating performance in 1800 ∼ 2500 nm. In addition, thermal insulation experiments proved that the smart window device prepared by the film could achieve a reduction of 9.3 °C under daylight. Overall, the photochromic films prepared using the one-pot method show good performance involving mechanical strength, efficient photochromic response, broad spectral range modulation, high coloring efficiency and cycling stability, and have promising applications in energy-saving buildings, anti-counterfeiting and smart displays.
研究领域:
材料科学
·
能源工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Xiaoqing Wang,Jinyun Xu,Shijie Shang,Ming Li,Sijia He,Xiaoyan Wang,Bingyu Yang,Yirang He,Xiaolu Ru,Yanyan Ji,Wenju Zhu,Chunming Zheng,Xiaohong Sun
Bipolar membranes (BPMs), composed of anion exchange membrane (AEM) and cation exchange membrane (CEM), hold promise for energy and environmental applications due to their ability to dissociate water into H + and OH − under reverse bias. However, their practical voltage requirements often exceed theoretical potentials, necessitating efficiency optimization. This study introduces an innovative BPM design integrating alginate (SA)-based CEM with chitosan AEM, enhanced by polydopamine-coated halloysite nanotubes (DHNTs) loaded with phosphotungstic acid (HPW). The tubular structure of the DHNTs, modified via dopamine polymerization, improved mechanical stability and proton conductivity, while HPW coating (optimized at 10 wt %) facilitated acid-base interactions, reducing proton hopping distances. Comprehensive characterization (SEM, FTIR, XPS, TGA) confirmed successful HPW coating and structural modification. The optimized BPM exhibited enhanced tensile strength than unmodified BPM with proton conductivity of 36.56 mS/cm and low water dissociation overpotential of 1.188 V at 70 mA/cm 2 . Electrodialysis tests revealed reduced interfacial resistance (IR drop) and increased stability over 48 h, attributed to HPW's catalytic role in accelerating ion transport and minimizing energy loss. The synergy between DHNTs and HPW significantly improved hydrophilicity, mechanical robustness, and energy efficiency, demonstrating the potential of this design for sustainable electrochemical systems. These findings provide critical insights into advanced BPM development for scalable energy and environmental technologies.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2014
·Vol. 144
·期 10
·1728-1734
·
IF 2.291
Wang Shengpei,Chen Jinzhu,Chen Limin
Abstract A multifunctional catalyst of ruthenium supported on NENU-3 [a hybrid of phosphotungstic acid (PTA) and HKUST-1] is developed. An ethylene glycol (EG) yield of 50.2 % can be directly obtained from cellulose with Ru/NENU-3 as catalyst under optimized conditions. As a multifunctional catalyst of Ru/NENU-3, the presence of both the active specie of PTA for cellulose hydrolysis and subsequent C–C bond cleavage of cellulose-derived sugars, and the active specie of Ru for glycolaldehyde hydrogenation is indispensible for the formation of EG from cellulose. Graphical Abstract
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）