Journal of Biobased Materials and Bioenergy
·
2019
·Vol. 13
·期 5
·677-682
·
IF 0
Zhu Qiao-Qiao,Zhuang Jun-Ping,Wang Lan-Ying,Liu Ying,Wu Shu-Bin
Three kinds of silicotungstate, Zn2SiW12O40, Ag4SiW12O40 and Al4/3SiW12O40 were performed for the dehydration reaction to produce valuable platform chemicals levulinic acid
(LA) and 5-hydroxymethylfurfural (HMF) from glucose. The results showed that Al4/3SiW12O40 seemed beneficial for LA and HMF production from glucose. The highest LA yield of 50.4% was obtained when the glucose conversion was almost 100% at 180 °C
for 120 min with glucose was 0.5 g and the catalyst dosage was 0.45 g. The recycling of Al4/3SiW12O40 catalyst can be reused at least for four times with the activity loss less than 18.4% and the SEM images showed that the activity loss less may
due to the formation of the clustered fine particles on catalyst surface. This work provided a promising strategy for the production of LA from carbohydrates using inexpensive silicotungstate catalysts in aqueous medium.
研究领域:
化学工程
·
可再生化学
✓ 已验证
DOI
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 23
·期 3
·823-831
·
IF 1.385
Yuan Junjie,Xiong Jun,Wang Jiahong,Ding Wenjing,Yang Lei,Zhang Ming,Zhu Wenshuai,Li Huaming
A supported catalyst was synthesized on the mesoporous materials with ionic liquid modified by the silicontungstic acid (HSiW-IL/SBA-15). A series of characterization, such as XRD, N 2 adsorption desorption, SEM, TEM and XPS analysis showed that HSiW was successfully immobilized onto the IL modified SBA-15 and maintained the SBA-15 mesoporous structure. Compared with HSiW and HSiW/SBA-15, the catalyst HSiW-IL/SBA-15 had excellent catalytic activity for oxidative desulfurization of fuels. After analysis, the high activity of HSiW-IL/SBA-15 was attributed to the catalyst with large specific surface area, pore size and hydrophobic performance, which had a better wettability for fuel. The catalyst had a good recycling performance, and the sulfur removal still remained 96.4 % after eight times cycle.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Oceanology and Limnology
·
2024
·
IF 1.3
Zhou Luxiao,Gao Kun,He Peng,Yu Huahua,Xing Ronge,Liu Song,Qin Yukun
The conversion process of chitin, one of the abundant biomass resources on the earth, not only follows the principles of green chemistry, but also has significant value in industrial applications. However, it is a great challenge to directly convert insoluble and rigid structured chitin to 5-hydroxymethylfurfural (HMF). To address this issue, we developed a green conversion process combining pretreatment and catalytic system. Chitin was first pretreated by hexafluoro isopropanol (HFIP), which somewhat disrupted the hydrogen bonding network within the chitin structure. Subsequently, formic acid (FA) and silicotungstic acid (STA) synergistically catalyzed the conversion to HMF in a biphasic system of 2-methyltetrahydrofuran (2-Me-THF)/H 2 O, and high yields (40.2%) HMF was obtained under the optimism conditions. The product distribution was analyzed by HPLC-MS and the co-catalysis of FA with STA was evidenced. A dual-function catalytic system with both Lewis and Brønsted acids was created, the catalytic system that significantly improved the efficiency of complex tandem catalytic reactions with chitin. Based on the experimental results, a possible pathway for chitin conversion was deduced, providing a new catalytic idea for the efficient conversion of chitin to HMF.
研究领域:
生物化学
·
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Wen Xia,Yu-Mei Nie,Na Lei,Zhu Tao,Qiang-Jiang Zhu,Yun-Qian Zhang
The esterification reaction used to prepare butyl paraben (BP) and propyl gallate (PG) catalyzed using a cucurbit[6]uril-supported Keggin-type silicotungstic acid (Q[6]-STA) catalyst has been investigated. The Q[6]-STA catalyst has been characterized using FTIR spectroscopy, XRD, SEM, EDS, thermal analysis, and surface area studies. Q[6]-STA was easy to prepare in high yield and exhibited some advantageous properties, such as high catalytic activity and its convenient recovery. Moreover, a reusability study showed that the Q[6]-STA catalyst was stable and active.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yingqian Zhang,Zhifei Ma,Xianchuan Xie,Daishe Wu,Xing Peng,Jianlong Li
Zero-valent iron (ZVI) is a promising technology for groundwater treatment , and its efficiency primarily depends on the electron transfer . However, there are still some problems such as low electron efficiency of ZVI particles and high yield of iron sludge that limits the performance, which warrant further investigation. In our study, a silicotungsten acidified ZVI composite (m-WZVI) was synthesized by ball milling to activate PS to degrade phenol. m-WZVI has a better performance on phenol degradation (with a removal rate of 91.82%) than ball mill ZVI(m-ZVI) with persulfate (PS) (with a removal rate of 59.37%). Compared with m-ZVI, the first-order kinetic constant (k obs ) of m-WZVI/PS is 2–3 times higher than that of the others. Iron ion was gradually leached in m-WZVI/PS system, being only 2.11 mg/L after 30 min, having to avoid excessive consumption of active substances. The underlying mechanisms of m-WZVI for PS activation mainly include: 1) were elucidated through different characterizations analyses that accounted for silictungstic acid (STA) can be combined with ZVI, and a new electron donor (SiW 12 4− ) was obtained, which improved the transfer rate performance of electrons for activating PS; 2) singlet oxygen ( 1 O 2 ) is the main active substance for phenol degradation, but other radicals also played an important role. Therefore, m-WZVI has good prospects for improving the electron utilization of ZVI.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 13
·期 1
·40
·
IF 4.501
Qiuyun Zhang,Mengmeng Hu,Jialu Wang,Yanting Lei,Yaping Wu,Qing Liu,Yongting Zhao,Yutao Zhang
In this study, the bimetallic Ni-Zr MOF-derived nickel-zirconium oxide (Ni-Zr-O)-impregnated silicotungstic acid (HSiW) nanocomposite catalyst (HSiW@Ni-Zr-O) was prepared via a hydrothermal procedure followed by a pyrolysis treatment, and its structural, morphological, and surface components and oxidation states were characterized by using XRD, FTIR, TPD-NH3, SEM, TEM, N2physisorption, and XPS analyses. Then, the nanocomposite catalysts were successfully applied to the esterification of oleic acid (OA) with methanol. According to its characteristics, the obtained HSiW@Ni-Zr-O-1 catalyst would generate larger pores, a higher acidity, and active interfaces at the calcining temperature of 300 °C. Therefore, HSiW@Ni-Zr-O-1 exhibits an excellent catalytic activity of 95.2% under optimal reaction conditions. Additionally, the catalyst can be reused with a good catalytic activity after nine cycles. This study highlights the opportunity of using bimetallic MOFs as precursors to the synthesis of highly nanoporous metal oxide, which supports the larger-industrial scale production of biofuels.Keywords:silicotungstic acid;MOF;nickel-zirconium oxide;esterification;biofuels;catalysis
研究领域:
化学工程
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 23
·18022-18033
·
IF 4.6
Xiyang Zhou,Li Yu,Xu Li,Weizhou Jiao,Ruixin Wang
It is well-known that defect engineering and morphology engineering are key strategies for giving an impetus to the catalytic activity of catalysts. This study reports the successful regulation of oxygen vacancy (OV) defects and the morphology of a Keggin-type silicotungstic acid (SiW12)-loaded N-doped carbon (NC) matrix, which is obtained by calcining a copolymer of acryloyloxyethyl trimethyl ammonium chloride (DAC) and acrylamide (AM) as precursors in air. It was unveiled that adjusting the proportion of AM in the copolymer could be simultaneously conducive to the targeted regulation of OV defects of catalysts and their morphological evolution from bowls to spheres. The as-prepared OV-SiW12/SNC sphere catalyst showed an excellent oxidative desulfurization (ODS) performance with H2O2 as a green oxidant. Complete removal of DBT (2000 ppm) was achieved within 12 minutes at 60 °C with a large rate constant of 0.4055 min−1. The outstanding ODS performance was critically ascribed to the highly active W sites promoted by the abundant OV defects, and the easy diffusion and contact between the substrate and W sites were led by the spherical structure. Moreover, the as-prepared catalyst exhibited prominent reusability. This ODS reaction was found to follow a HO˙ radical mechanism.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·184-194
·
IF 3.97
Qiuyun Zhang,Binbin Yang,Yuanyuan Tian,Xianju Yang,Rongfei Yu,Jialu Wang,Taoli Deng,Yutao Zhang
In the present study, a facile solvothermal method was used for the synthesis of silicotungstic acid (HSiW) immobilized on Ce-based metal organic framework (Ce-BDC) and embedded in Zr-based metal-organic framework (UiO-66(Zr)) composite catalyst, namely, Ce-BDC@HSiW@UiO-66 for the production of biodiesel through green fatty acid esterification. The obtained hybrids were characterized by various characterization technologies, including Fourier transform infrared, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 physisorption, X-ray photoelectron spectroscopy, and temperature-programmed desorption of NH 3 (NH 3 -TPD) analysis. The characterization analyses showed that the hybrids have been successfully synthesized. Also, the volume and pore size of UiO-66(Zr) were changed by introducing HSiW@Ce-BDC, and the resulting Ce-BDC@HSiW@UiO-66 possessed the mesoporous structure and relatively high surface area. Simultaneously, the NH 3 -TPD analysis of Ce-BDC@HSiW@UiO-66 reveals that the acid strength was increased in comparison with HSiW@Ce-BDC. In addition, the composite Ce-BDC@HSiW@UiO-66 demonstrated high catalytic activity, and the oleic acid esterification gave 81.5% conversion at optimum conditions of 0.2 g catalysts, 1:30 oleic acid to methanol molar ratio at 130°C for 4 h. More interestingly, after six recycling cycles, the reduction in the conversion rate was only 4.6%, indicating that Ce-BDC@HSiW@UiO-66 has excellent reusability. Our study provides an effective approach to synthesize multifunctional hybrids for green biofuel production.
研究领域:
化学工程
·
催化材料
·
可再生资源
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Kaifeng Lu,Yifan Wang,Lingjun Zhu,Bo Xing,Shurong Wang
The conversion of biomass-derived saccharides into platform chemicals is of immense importance for biorefineries. This study demonstrated the potential of using heteropoly acid as a catalyst in a green solvent system composed of γ-valerolactone and water for the production of levulinic acid from biomass-derived saccharides. The effects of heteropoly acids with different central heteroatoms (P and Si) and addendum atoms (W and Mo) on the catalytic conversion of glucose to levulinic acid in the γ-valerolactone–water system were studied. According to the experimental results, silicotungstic acid had the highest catalytic activity. In comparison to other catalysts, silicotungstic-acid-catalyzed glucose conversion could obtain the highest levulinic acid yield under the same reaction conditions, which was mainly attributed to the lower ratio of Brønsted/Lewis acid of silicotungstic acid. In optimal circumstances, 87.7% levulinic acid was obtained by glucose conversion at 190 °C and 60 min. Meanwhile, non-protonic polar solvent γ-valerolactone could promote the slight conversion of glucose to pentose, producing about 9% furfural. In addition, a kinetic model was established to further evaluate the reaction process of glucose conversion to levulinic acid and furfural. The green reaction system was also appropriate for other saccharides. In this study, a new approach could be provided to efficiently convert saccharides into platform chemicals.
研究领域:
生物化学
·
可再生资源与环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yifan Wang,Kaifeng Lu,Yuan Zhao,Lingjun Zhu,Shurong Wang
Converting renewable biomass into liquid fuels and value-added chemicals has emerged as a pivotal technology, driving the transformation of the energy landscape. Efficiently transforming the cellulose components of biomass into the crucial liquid fuel precursor levulinic acid holds profound significance. The principal objective of this study is to fabricate a temperature-responsive catalyst based on Al-doped silicotungstic acid, which is intended for converting glucose into levulinic acid. By exploiting the interaction between choline chloride and silicotungstic acid, which exhibits a notable capacity for high proton migration, we successfully synthesized a stable acid catalyst with responsive properties to temperature changes. Through precise adjustments of Al3+ concentration, we engineered a collection of Lewis/Brønsted composite catalysts capable of responding to temperature variations. A comprehensive analysis of the catalyst’s structure and acidity was conducted using various techniques including FTIR, XRD, TEM, and Py-IR. These methods revealed crucial insights into the crystalline architecture, surface morphology, and distribution of acidic domains, providing a solid foundation for a deeper understanding of the catalytic reaction mechanism. Through the meticulous optimization of key reaction parameters, including Al3+ loading, solvent composition, reaction temperature, and reaction duration, the ChAl2/3HSiW12O40 catalyst achieved its pinnacle of efficiency at 150 °C over an 8 h period. This resulted in the remarkable outcome of complete glucose conversion, yielding an impressive 62.01% of levulinic acid. Additionally, an evaluation of the catalyst’s recyclability was carried out, demonstrating its commendable hydrothermal stability and ability for repetitive usage without any reduction in catalytic efficiency.
研究领域:
化学工程
·
可再生资源转化
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Ping Niu,Jingcheng Hao
Photocatalytic nanocomposite films (TiO 2 /SiW 12 ) n (TiO 2 = titanium dioxide, SiW 12 = H 4 SiW 12 O 40 ) were fabricated via an electrostatic layer-by-layer (LbL) self-assembly method, which is a rapid and simple experimental fabrication process. UV–vis absorption spectra, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) were performed to characterize the LbL assembly process, surface morphology, and elemental composition of (TiO 2 /SiW 12 ) n multilayer films. The influence of bilayers number of (TiO 2 /SiW 12 ) n composite films on the efficient removal of methyl orange (MO) was studied. In order to determine the feasibility of the film catalysts for dye pollutants degradation, we chose three types of colorful dyes including azoic, fluorescent, and sulfonic. Photodegradation rate of MO is significantly suppressed by inorganic salts including sodium chloride and sodium sulphate due to the aggregation or association of ionic dye in water. The presence of nonionic polyoxyethylene dodecyl ether (C 12 E 23 ) accelerates the MO degradation. However, a marked inhibition of anionic sodium dodecylsulfate (SDS) on MO degradation is found at different SDS concentrations. It is expected that the fabricated photocatalytic nanocomposite films could have substantial applications in textile industries or wastewater purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 122
·期 1
·357-367
·
IF 1.264
Wu Shuxiang,Wang Wenhang,Fang Yuzhen,Kong Xiangjin,Liu Junhai
Silicotungstic acid (STA) modified ZIF-8 catalyst was developed by simple impregnation method for Friedel–Craft acylation reaction. The best performance was observed on 20 wt% STA/ZIF-8, over which conversion of anisole and selectivity towards p-benzoylanisole reached 99.2 and 93.5%, respectively. N 2 physisorption, XRD, FT-IR, TGA and Pyridine FT-IR characterizations indicated that introduction of STA to ZIF-8 did not change its main structure but increased its acid site density, which promised enhanced catalytic performance of the obtained catalyst. Moreover, the performance of the catalyst was further proved through a series of substrates with electron donor or withdraw substitution group, since all of substrates could be converted to corresponding p-isomer effectively.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）