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
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可再生能源
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环境科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yuyue Yan,Liyuan Liu,Guanhua Ren,Xueqian Zhang,Chunmei Ouyang,Hongwei Zhao,Jiaguang Han
The co-solvent system of tert -butanol and water is commonly employed in the field of freeze-drying pharmaceuticals. Investigating the phase composition and behavior of this system at low temperatures contributes to furthering its applications. In this study, THz-TDS was used to investigate the melting process of the frozen tert -butanol-water binary system for the first time. Utilizing the THz fingerprint peaks, we discovered that following the initial freezing, the system only formed metastable dihydrate tert -butanol, but near the melting point, it transformed into stable heptahydrate tert -butanol. This transition did not occur at high tert -butanol contents. Combining DFT calculations, all observed absorption peaks were attributed to the low-frequency vibration modes of each crystal. A phase diagram of the tert -butanol-water binary system was constructed based on the difference in absorbance intensity between the solid and liquid phases. The results demonstrate the potential of THz spectroscopy for applications in pharmaceutical freeze-drying.
研究领域:
药学
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物理化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 27
·8650-8658
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IF 7.393
Xin Tang,Tengteng Li,Qingyan Li,Hongliang Zhao,Silei Wang,Mengyao Li,Xuanruo Hao,Yating Zhang,Jianquan Yao
The preparation of most high-performance perovskite optoelectronic devices usually relies on costly inert or vacuum conditions to circumvent the inimical effects of moisture, which could lead to inferior crystallization processes and nonuniform morphology. Hence, it is imperative to develop a reliable and cost-effective approach to deposit a high-quality perovskite in ambient air. Herein, we investigated the influence of tert-butanol (TBA), sec-butanol (SBA), and isobutanol (IBA) on the nucleation mechanism in ambient atmosphere. It was found that TBA as an eco-friendly anti-solvent leads to the formation of uniform, smooth, pinhole-free, mirror-like perovskite films with enhanced optoelectronic properties compared with other solvents. More excitingly, perovskite photodetectors fabricated using TBA exhibited an excellent photoresponsivity of 1.93 A W−1, which is among the highest values reported for the same device structure and also demonstrates the distinctive advantages of our nucleation management strategy. This work sheds light on developing high-performance perovskite photodetectors using eco-friendly solutions in ambient environment.
研究领域:
材料科学
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光电技术
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Longfei Tang,Songjiang Chen,Shiwei Wang,Xiuxiang Tao,Huan He,Lei Zheng,Chenyan Ma,Yidong Zhao
The present work investigated the feasibility of heterocyclic sulfur (HS) removal for coal utilizing potassium tert-butoxide and hydrosilane system. Changes of sulfur forms with treatment time in Xinyu (XY) coal were determined by XANES . Results showed that reductions of total sulfur and organic sulfur for XY coal were 55% and 53%, respectively. >85% sulfoether and thiophene sulfur were removed after treated for 4 h, suggesting that the HS could be removed to a high extent from coal. However, contents of sulfonate and sulfonic ester increased with treatment time due to the hydrolysis and oxidation of intermediate products containing Si S bands. Furthermore, it indicated that the HS could be removed selectively from coal without destroying the macromolecular structure of coal based on analysis of desulfurization mechanism. These findings suggested that the desulfurization of refractory HS in coal could be obtained using the potassium tert-butoxide/hydrosilane reductive system, which provided a reference for desulfurization of high organic sulfur coal .
研究领域:
能源化学
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煤化工
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环境化学
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应用化学
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清洁燃料技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Kangling Yin,Li Chen,Feng Liu,Taotao Fan,Zongcheng Yan
Aiming at developing more biocompatible and economic separation platforms, aqueous biphasic systems (ABS) composed of deep eutectic solvents (DES) and tert-butanol were proposed for the first time. The effects of key factors such as the hydrogen-bond donor (HBD) properties and temperature on the phase-forming ability of DES/tert-butanol ABS were investigated. Meanwhile, syringic acid and eugenol mixtures were selected as model biomolecules to evaluate the efficiency of DES/tert-butanol ABS to use as liquid–liquid extraction systems. The results indicated that DES components migrated preferentially to the bottom phase while tert-butanol was concentrated in the top phase. The more hydrophilic HBD or lower temperature was responsible for greater efficiency to induce the formation of DES/tert-butanol ABS. The reason for phase separation was the incompatibility of the hydrogen-bond acceptor (HBA) and HBD with tert-butanol in aqueous solution, where the higher hydrophilic HBD enriched favorably in the lower phase, allowing for the formation of the DES/tert-butanol ABS. The selective separation of syringic acid and eugenol was a consequence of the HBD characters, temperature, and tie-lines length of the ABS, and they could be greatly separated by using the ABS composed of betaine-xylitol (DES) and tert-butanol at 298.15 K. The highest extraction efficiency of syringic acid and eugenol was 91.64 and 97.62%, respectively. Further, syringic acid and eugenol as well as DES can be recovered and reused by using water as the antisolvent and the vacuum distillation method. This study may be expected to lay a solid foundation for the expansion of DES-based ABS and selective separation of similar biomolecules.
研究领域:
化学工程
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生物技术
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产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
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IF 3.674
Lei Wang,Guoliang Wang,Lu Wang,Shasha Feng,Deren Fang,Wenyou Xu,Haisheng Wei,Lv Qi,Wanzhong Ren
Co 6 Fe 4 Mo 12 Bi 1.5 O x phase has been successfully synthesized via a novel urea-assisted hydrothermal process, wherein urea as an assistant reagent plays an important role on the homogeneous dispersion of the metal elements in the obtained mixed solution. The resulted catalyst was characterized by powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometer. These results suggest that the catalyst is mainly a single phase. Compared with the common multiphase metal oxides, the single Co 6 Fe 4 Mo 12 Bi 1.5 O x phase exhibits remarkable activity in selective oxidation of tert-butyl alcohol to methacrolein by synergistic effects of two active sites at a nano level in the single phase system.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Zhenxing Cai,Pingxin Li,Hui Zhao,Lingyan Wang,Xiaobo Chen,Chaohe Yang
The solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in p-, o-, and m-xylenes and ethylbenzene was measured by a gas chromatography method under an atmospheric environment. The measured data indicated that the solubility of cyclohexanone, tert-butanol, and 1,4-dioxane in the xylenes and ethylbenzene increases with increasing temperature. The experimentally determined solubility results were fitted with the modified Apelblat equation, Van’t Hoff equation, and Wilson model. Among them, the Wilson model was most consistent with the measured solubility results. The dissolution-related thermodynamic properties of cyclohexanone, tert-butanol, and 1,4-dioxane in xylenes and ethylbenzene, including the changes of molar Gibbs free energy, molar enthalpy, and molar entropy, were predicted and analyzed via the correlated Wilson model, which indicates that the dissolution behaviors are spontaneous and endothermic process. The obtained solubility results provide the thermodynamic foundation for the development and upgrading of industrial separation processes related to xylene, ethylbenzene, cyclohexanone, tert-butanol, and 1,4-dioxane.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
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2023
·Vol. 20
·期 6
·4902
·
IF 4.614
Ruiqi Wu,Ning Liu,Chengna Dai,Ruinian Xu,Ning Wang,Gangqiang Yu,Biaohua Chen
N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were, respectively, loaded on the zeolite catalysts via the impregnation method. It was found that the catalytic performance of BEA was the best among the molecular sieves. Comparing the catalytic performance of Fe-BEA under different load gradients (0.25~2%), it was found that 1.5% Fe-BEA possessed the best catalytic activity. A series of characterization methods showed that Fe3+content in 1.5% Fe-BEA was the highest, and more active sites formed to promote the catalytic reaction. The α-O in the reaction eventually oxidized tert-butanol to CO2over the active site. The Co mainly existed in the form of Co2+cations over Co-BEA samples; the 2% Co-BEA possessing higher amounts of Co2+exhibited the highest activity among the prepared Co-BEA samples.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Longfei Tang,Shiwei Wang,Xiangnan Zhu,Yiliang Guan,Songjiang Chen,Xiuxiang Tao,Huan He
The present work investigated an effective reductive desulfurization method for thiophene sulfur in high organic sulfur coal utilizing the potassium tert-butoxide/hydrosilane. Maximum decreases of 65.8% and 64.2% in organic sulfur for Xinyu coal and Guxian raw coals were, respectively obtained under the optimized conditions of the molar ratio of reductive assistant to sulfur of coal (15), treatment time (80 min), temperature (215 °C). According to the results of XPS, more than 80% mercaptan , sulfoether and thiophene on the raw coals surface were removed without destroying the macromolecular structure of coal. Sulfur on treated coal surface samples mainly existed in the form of sulfonate and sulfone due to the hydrolysis and oxidation of intermediate products generated in the reduction desulfurization reaction. These findings confirmed the possibility of effective removal for thiophene sulfur in coal utilizing the reductive system, which could give a reference for thiophene sulfur removal of high organic sulfur coal.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
TETRAHEDRON
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2012
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IF 3.025
Jian-An Jiang,Wei-Bin Huang,Jiao-Jiao Zhai,Hong-Wei Liu,Qi Cai,Liu-Xin Xu,Wei Wang,Ya-Fei Ji
A concise ‘one-pot’ synthesis of a variety of 4-substituted 1,5-diaryl-1 H -pyrazole-3-carboxylates has been developed in moderate to good yields with excellent regioselectivity . Less cost lithium tert -butoxide has been identified as a base for sterically hindered Claisen condensation to efficiently generate the labile 3-substituted 4-aryl-2,4-diketoesters. Furthermore, extensive studies lead to a ‘one-pot’ process by combination of the Claisen condensation and the Knorr reaction for the synthesis of highly valuable 4-substituted 1,5-diaryl-1 H -pyrazole-3-carboxylates.
研究领域:
有机化学
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药物化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Dongjin Yu,Yuantong Hao,Chunsheng Cheng,Xu Ming,Jie Hu,Xiaohua Ma
Process safety for synthesis of tert -butyl hydrogen peroxide (TBHP) by tert -butyl alcohol (TBA) to react with H 2 O 2 was studied in this paper. On-line Raman spectroscopy and gas chromatography jointed analysis method was researched to monitor and analyze the changes of each components during the process to study reaction mechanism. The reaction kinetics was reproduced by apparent thermodynamics study and simulation for whole process, and the kinetics model of TBHP synthesis was obtained and with the first reported. The process safety parameter of the maximum temperature of the synthesis reaction(MTSR) and yield were predicted by response surface methodology (RSM) method and go through experimental verification further. It was found that the sulfuric acid and the concentration of TBA had great influences to reaction selectivity and yield. According to our research results, we supposed that the mechanism of TBHP synthesis would be followed by SN 1 +SN 2 . Focus on process safety, process risk assessment was done and pipe reaction to optimize TBHP synthesis was developed to change the batch process to pipe continuously. The yield of TBHP was 91.1%, conversion of TBA was 93.1%, and the selectivity of TBHP was 97.8%. The process safety parameters of heat accumulation and MTSR decreased 40.5% and 37.7% respectively comparison of the pipe continuous reaction and batch process. This study will provide guidance for intrinsic safety improvement of peroxidation reactions.
研究领域:
化学工程
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过程安全研究
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 24
·8061
·
IF 4.6
Jiaying Lv,Ruimao Hua
A two-step, one-pot synthesis of 3-substituted 1H-dibenzo[e,g]indazoles in good to high yields via a LiOtBu-promoted intramolecular 1,3-dipolar cyclization of 2′-alkynyl-biaryl-2-aldehydeN-tosylhydrazones was developed. TheN-Ts-hydrazones used were prepared in situ via the reactions of 2′-alkynyl-biaryl-2-aldehydes and TsNHNH2(p-methylbenzenesulfonohydrazide). Two types of signals related to the hydrogen bonds, forming in several products, were observed in the1H NMR spectra recorded in DMSO-d6, assigned to N-H bonds in their dimeric species of product and tautomer.Keywords:N-tosylhydrazones;1H-dibenzo[e,g]indazoles;intramolecular cycloaddition;lithiumtert-butoxide;hydrogen bonds
研究领域:
有机化学
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药物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）