CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2015
·Vol. 31
·期 5
·761-765
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IF 0.875
Sun Weizhi,Yu Shitao,Xian Mo
To investigate the green trinitration method of aromatic compounds, with Lewis acid/ionic liquid as catalyst and HNO 3 /Ac 2 O as nitration reagent, a Lewis acid/ionic liquid/HNO 3 /Ac 2 O system was established. In various combinations of Lewis acids and ionic liquids, Bi(NO 3 ) 3 ·5H 2 O/[HMIM]ClO 4 proved to be a very efficient catalyst for the trinitration of activated aromatic compounds and reusable for 3 times. Reaction conditions for the trinitration were optimized and yields of the trinitro products were from mild to excellent. This sulfuric acid-free system has the advantages of strong trinitration ability, low environment pollution, low toxicity, low cost and high potential for industrial application.
研究领域:
有机化学
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环境化学
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DOI
高影响因子
Green Energy & Environment
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2025
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IF 14.6
Xiang Hui,Jianhui Shi,Jiajun Zhang,Yan Cao,Huiquan Li,Peng He,Liguo Wang
The carbonylation of amines offers a promising route for synthesizing N-substituted carbamates with high atom economy. However, conventional catalysts exhibit limited catalytic efficiency, and the underlying proton transfer mechanism remains elusive. Herein, we reported a metal-free, room-temperature strategy utilizing 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as a dual hydrogen bond catalyst to synergistically activate propylamine (PA) and dimethyl carbonate (DMC). This green catalytic system achieves a 10-fold acceleration in reaction rate compared to other hydrogen bonding catalysts under mild conditions. This is enabled by dual hydrogen bonding of TBD with PA and DMC, which facilitates rapid proton transfer and stabilizes tetrahedral intermediates. Theoretical calculations confirm that the dual hydrogen bond system significantly lowers activation energy compared to single hydrogen bond analogs. Furthermore, it was revealed that the hydrogen bonding network within the product is the primary factor responsible for the sluggish reaction rate. This study demonstrates the effectiveness of a dual hydrogen bond system in accelerating the carbonylation of amines and provides a green route to access carbamates.
研究领域:
化学
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催化科学
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有机合成
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 1
·e3946
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IF 2.319
Xingquan Xiong,Zhongke Tang,Zhaohong Sun,Xiaoqing Meng,Sida Song,Zhilong Quan
An eco-efficient, green, and multi-gram procedure is presented for one-pot multicomponent synthesis of N -substituted 1,2,3-triazoles by using waste fishbone powders supported CuBr (FBPs-CuBr) as catalyst. FBPs-CuBr is found to be an efficient heterogeneous catalyst and a series of 1,2,3-triazoles are obtained in moderate to excellent yields in water under MW irradiation (70–98%). It can be separated conveniently by a simple filtration and reused at least seven consecutive runs with a slight drop in the product yields. Furthermore, the desired product still could be obtained in 80% yield when the scale of the reaction was increased to 40.0 mmol.
研究领域:
有机化学
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绿色化学
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催化材料
✓ 已验证
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2024
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IF 1.6
Ping Xie,Tianhao Zhong,Tao Li,Yiwu Lu,Yingmin Yu,Qingshan Zhao,Zhongtao Li
There is an urgent need to develop green catalytic transesterification technology to reduce liquid waste and instrument corrosion. Ionic liquids with controlled activity, easy recovery, and corrosion resistance have great potential as catalysts for transesterification reactions. In this paper, a series of ionic liquids were prepared using imidazole and ammonium compounds as cations, and sulphuric acid, p -toluenesulfonate, and bistrifluoromethanesulfonate anions as anions. In comparison, the ionic liquid made from imidazole with H 2 SO 4 (IMIHS) was found to be the best catalyst for the esterification reaction with high speed, high activity, low corrosion, and high stability, and its catalytic performance was superior to that of sulphuric acid. The optimum reaction conditions were as follows: the molar ratio of ethanol to acetic acid was 1:1, the catalyst amount was 5 wt.%, the reaction temperature was 80°C, and the reaction time was 120 min. The maximum yield of ethyl acetate was 66.2% under the optimum reaction conditions. The catalytic activity was not declined obviously by reusing six times. The activation energy of the reaction is 48.748 kJ/mol.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·586
·
IF 3.426
Changbo Zhao,Caijuan Huang,Qin Chen,Ian D. V. Ingram,Xiankui Zeng,Tianhua Ren,Haibo Xie
The design and preparation of polymers by using biobased chemicals is regarded as an important strategy towards a sustainable polymer chemistry. Herein, two aromatic diols, 4-(hydroxymethyl)-2-methoxyphenol and 2-(4-(hydroxymethyl)-2-methoxyphenoxy)ethanol, have been prepared in good yields through the direct reduction of vanillin and hydroxyethylated vanillin (4-(2-hydroxyethoxy)-3-methoxybenzaldehyde) using NaBH4, respectively. The diols were submitted to traditional polycondensation and polyaddition with acyl chlorides and diisocyanatos, and serials of new polyesters and polyurethanes were prepared in high yields with moderate molecular weight ranging from 17,000 to 40,000 g mol−1. Their structures were characterized by1H NMR,13C NMR and FTIR, and their thermal properties were studied by TGA and differential scanning calorimetry (DSC), indicating that the as-prepared polyesters and polyurethanes have Tgin the range of 16.2 to 81.2 °C and 11.6 to 80.4 °C, respectively.
研究领域:
材料科学
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有机化学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
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IF 3.849
Haonan Qu,Yanmei Zhou,Yiming Ma,Peng Zhao,Bin Gao,Meixia Guo,Caixia Feng
Natural amino acids were chosen as excellent precursors for the synthesis amino acid protic ionic liquids (AAPILs) and they can be easily converted to cations and properties of functionalities incorporate into ionic liquid. Herein, we reported the study to catalyze hydrolysis of cellulose in 1-butyl-3-methylimidazolium chloride solvent by using different structure of AAPILs, which were synthesized via a one-step acid-base neutralization reaction. In addition, amino, hydroxyl and carboxyl functional groups on the AAPILs serving as catalytic domain and binding domain can promote cellulose hydrolysis. Moreover, a remarkable total reducing sugar yield of 67.1% was achieved by lysine derived ionic liquid within 1.5 h at 130 °C while the cellulose conversion was nearly 100%, which was attributed to its more catalytic sites. On the whole, AAPILs are promising catalysts for the differential conversion of inedible cellulose owing to its low cost, sustainable renewable and potential biodegradable.
研究领域:
生物化学
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催化化学
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可再生资源利用
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绿色化学
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生物质转化
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2020
·
IF 4.794
Yusheng Lu,Fangjie Lu,Mingyuan Zhu
In industry, mercury catalysts are mainly used in hydrochlorination of acetylene. However, the sublimation of mercury considerably harms human health and the environment. Therefore, the development of green catalysts is particularly demanding to eliminate the negative effects of such toxic catalysts. Based on this, we used a green, low-cost carrageenan as raw material. A nitrogen-modified carbon material was prepared by nitrogen modification using urea. Based on the reaction conditions of the catalyst dosage = 0.75 g, WHSV = 2.22 mL/g/min, temperature = 260 °C, the conversion of the nitrogen-modified catalyst was 98.7%. Various characterization methods had demonstrated that the nitrogen modification produced a large amount of nitrogen and that the nitrogen element was sufficiently dispersed in the carbon material. In addition, identification of the appropriate annealing temperature greatly improved the adsorption catalytic capacity for acetylene. Therefore, an environmentally friendly non-metallic catalyst was developed, which also providing essential feedback for future industrial development.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 8
·1786-1796
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IF 5.2
Jiabing Ren,Xin Ye,Xiaoyu Shi,Huixing Xu,Lanxin Wu,Tianfu Wang
The catalytic isomerization of glucose to fructose has been considered a crucial step in the field of biomass valorization. As such, the development of environment-friendly and efficient heterogeneous catalysts for glucose isomerization is urgently required. In this study, a green N-doped mineral catalyst (i.e., CS/Ab) was prepared with chitosan as nitrogen precursors deposited on the natural albite. The basicity of pristine albite is limited, but N-doping and calcination can significantly increase the density and strength of base sites. The CO2-TPD and XPS results identified that the introduction of nitrogen species (mainly pyridine and pyrrole) on the albite surface could impart the weak or medium base character of the catalyst, which is beneficial for fructose production with high selectivity. The CS/Ab catalyst displayed good catalytic performance with 38.9% yield and 85.4% selectivity of fructose at mild temperature (90 °C) in water, and the activation energy for the CS/Ab-catalyzed glucose conversion was calculated to be 46.9 kJ mol−1. This work advances the utilization of biomass waste and minerals as green and efficient catalyst for base-catalyzed biorefinery reaction, and provides insights into the active components for glucose isomerization.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Qiqi Lu,Xiu-Zhi Wei,Haiyong Wang,Qi zhang,Xinghua Zhang,Lungang Chen,Jianguo Liu,Longlong Ma
The selective hydrogenation of nitrile represents an atom-economical and reliable method to synthesize primary amine, a privileged compound in chemistry, biology, and medicine. However, this approach often displays severe selectivity issues, and additives or reducing agents are generally required to solve this problem. In this work, we aim to synthesize primary amine on a green catalytic system and probe into the catalytic mechanism of Pd-Ni interaction using benzonitrile (BN) as a model compound. The nitrile hydrogenation reaction was catalyzed by bimetallic Pd-Ni oxide nanospecies confined in Silicalite‑1 (S-1) zeolite using H 2 as hydrogen donor without any additive which was environmentally friendly and economic. A 92% yield of benzylamine (BA) was achieved on the [email protected] catalyst with a turnover number (TON) of 1667, and such BA yield was still maintained in upscaling experiment. Detailed characterizations shed light on the mechanism of the extraordinary performance of Pd-Ni oxide nanospecies on base-free nitrile hydrogenation.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Nan Hu,Lijuan Su,Hongyan Li,Ning Zhang,Yongqin Qi,Hongliang Wang,Xiaojing Cui,Xianglin Hou,Tiansheng Deng
Various excellent catalysts have been explored for the methanolysis of polycarbonate (PC), but it is still challenging to develop green and economical catalysts for solvent-free PC methanolysis to recover both bisphenol A (BPA) and dimethyl carbonate (DMC). Herein, green, efficient and solvent-free degradation of PC to BPA and DMC was achieved using urea as a cheap green catalyst. At 140 °C for 3 h, PC was completely degraded to BPA and DMC with yields of 93.4% and 74.7%, respectively. A possible catalytic degradation mechanism of PC was proposed by kinetic experiments and NMR, where urea, methanol and carbonate formed a six-membered ring in the reaction. It was found that the increase of urea concentration significantly reduced the activation energy, which was attributed to the fact that the increase of urea concentration made the six-membered ring easier to form and activated the carbonate bond. The degradation system can be reused directly up to 10 times and 100% degradation rate can be maintained. This work provides a simple, green and economical method for industrial PC recycling.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Haijiao Jia,Xiao Zhang,Guirong Borjihan,Shengbo Yang,Youxin Li
Using ruthenium chloride as catalyst precursor, magnetic silicon spheres as support, 4-formylphenylboronic acid and ethylenediaminepentaacetic acid as functional ligands, a magnetic heterogeneous nano-ruthenium catalyst (Fe 3 O 4 @SiO 2 -FPBA-DTPA-Ru) was prepared for the first time. It was nano level with 20.17 emu/g saturation magnetic strength and thermal stability under 249.63 °C. Fe 3 O 4 @SiO 2 -FPBA-DTPA-Ru contained 0.38 mmol/g Ru and was successfully used to catalyze the oxidation reactions of 15 aromatic secondary alcohols. Results proved that Fe 3 O 4 @SiO 2 -FPBA-DTPA-Ru as catalyst had good catalytic activity for the oxidation of secondary aromatic alcohols with yields exceeding 90 % for 12 products and 95 % for 10 products. High TON and TOF values (6386 and 9158 h −1 ) in 1-phenylethanol oxidation were obtained. All the reactions of aromatic alcohols were carried out in a solvent-free system, so the prepared catalyst had the characteristics of green and pollution-free. It was’nt suitable for oxidation of aromatic primary alcohols. If there was steric hindrance around the hydroxyl group in substrate, the catalysis also may be limited. The Fe 3 O 4 @SiO 2 -FPBA-DTPA-Ru catalyst also exhibited the advantages of energy saving, satisfactory reusability and stability in 9 consecutive runs. It showed great potential for future large-scale industrial production.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·869
·
IF 3.444
Xinyu Liu,Meihuan Lu,Xuan Wang,Juyou Lu,Jianxin Yang
For decades the steric effect was still ambiguously understood in catalytic benzylation reactions of arenes with benzyl alcohol, which limited the green synthesis of phenylmethane derivates in industrial scale. This research applies a series of silica–alumina beta zeolites to systematically evaluate factors like catalyst porosity, reactants molecule size, and reaction temperature on catalytic benzylation. First, a suitable hierarchical beta zeolite catalyst was screened out by X-ray powder diffraction, N2adsorption−desorption, and probe benzylation withp-xylene. In the following substrates expanding study, for a typical benzylation of benzene, it showed extraordinary performance among literature reported ones that the conversion was 98% while selectivity was 90% at 353 K only after 10 min. The steric effect of aromatics with different molecular sizes on benzylation was observed. The reaction activities of four different aromatics followed the order: benzene > toluene >p-xylene > mesitylene. Combined with macroscopic kinetic analysis, this comprehensive study points out for the first time that the nature of this steric effect was dominated by the relative adsorption efficiency of different guest aromatic molecules on the host zeolite surface.Keywords:benzylation;benzyl alcohol;hierarchical zeolite;steric effect;green catalysis
研究领域:
化学工程
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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）