RSC Advances
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2022
·Vol. 12
·期 21
·13251-13260
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IF 4.036
Xinglong Li,Mingming Li,Yuxin Liu,Yisi Feng,Pan Pan
5-Hydroxymethylfurfural (HMF) is one of the most important platform molecules and could be transformed into a variety of fuel additives and high value-added chemicals. Multiple catalyst systems have been developed for the conversion of carbohydrates to HMF, but there are still unavoidable problems, including high temperature and pressure, difficult recovery of solvent, corrosion of equipment, poor catalyst circulation, etc. Herein, a new magnetic Fe3O4@SiO2@mSiO2-TaOPO4 catalyst for the preparation of HMF from fructose in 2-pentanol was developed. The structures of the catalysts were characterized by FT-IR, TSM, EDS, SEM, XRD and VSM. The 2-pentanol solvent is not only conducive to the production of HMF, but also enables the reaction to be carried out at a lower pressure. The highest yield of HMF (85.4%) was obtained using 20 wt% catalyst under 10% substrate concentration (0.5 g of fructose) at 120 °C for 3 h. The catalysts can be easily separated by magnetism. The slight decrease in catalyst activity after 7 cycles was mainly due to the loss of catalyst during the cycle operation. Simultaneously, the total yield of HMF was 51.3% after scale-up to 15 g of fructose, showing the possible industrial application potential of this catalyst system.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
PubMed
高影响因子
Foods
·
2022
·Vol. 11
·期 17
·2584
·
IF 5.561
Lisha Hu,Shuyi Qiu,Yifeng Dai,Luqin Tian,Chaoyang Wei
The enantiomeric contents of 2-pentanol of Baijiu were analyzed by liquid-liquid extraction (LLE) coupled with gas chromatography-mass spectrometry (GC-MS) using β-cyclodextrin as a chiral stationary phase. In this study, the average enantiomeric ratiosR:Swere 72:28, 64:36, and 94:6 in soy sauce aroma-type Baijiu (SSB), strong aroma-type Baijiu (STB), and light aroma-type Baijiu (LTB), respectively, and only(R)- configuration was found in rice aroma-type Baijiu (RTB). The highest enantiomeric concentration of 2-pentanol was found in STB.(R)-2-pentanol dominated in 48 Baijiu studied, and the concentration of(R)-2-pentanol was higher than that of the(S)-configuration. The results showed that the enantiomers of 2-pentanol were discrepant in different aroma types of Baijiu, and it may be the result of differences in raw materials, environment, and production processes. The 2-pentanol enantiomers had different odor characteristics, with different olfactory thresholds in pure water and 46% ethanol solutions by sensory analysis.(R)-2-pentanol was described as paint, rubber, grease, while the(S)-form had mint, plastic, and pungent notes. The olfactory thresholds of(R)- and(S)-form were 163.30 mg/L and 78.58 mg/L in 46% ethanol and 12.62 mg/L and 3.03 mg/L in pure water, respectively. The different enantiomeric distribution and aroma characteristics of the 2-pentanol enantiomers in Baijiu could be a potential marker for determining adulteration.Keywords:Baijiu;2-pentanol;chirality;enantiomer;sensory analysis
研究领域:
分析化学
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食品科学
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感官科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Liping Wang,Saisai Zhou,Pan Li,Pengzhou Li,Qingsong Li,Yingmin Yu
Polyoxymethylene dimethyl ethers (DMMn) have attracted particular attention in industry as excellent oxygenated fuel additives. This study aims to reveal the liquid–liquid equilibrium (LLE) values regarding ternary mixtures {water + methylal (DMM1) + 4-methyl-2-pentanol (MIBC)}, {water + DMM2 + MIBC}, {water + DMM3 + MIBC}, and {water + DMM4 + MIBC} at 298.2 and 308.2 K under 101.3 kPa. Distribution factor and selectivity were utilized to assess the extracting capabilities of the selected extractant. The well known Hand equation and Othmer–Tobias equation were utilized to test the consistency of the LLE values. In addition, the experimental results were correlated by the UNIQUAC and NRTL thermodynamic models with all of the root-mean-square deviation values less than 0.0127,which indicated that both models agree well with the experimental tie-line data.
研究领域:
化学工程
·
热力学
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产品关联
DOI
高影响因子
Joule
·
2022
·
IF 46.048
Donglin Jia,Jingxuan Chen,Junming Qiu,Huili Ma,Mei Yu,Jianhua Liu,Xiaoliang Zhang
Inorganic CsPbI 3 perovskite quantum dot (PQD) shows high potential for new-generation photovoltaics due to its outstanding optoelectronic properties. However, the binding-energy-driven ligand exchange of PQDs limits the construction of conductive and stable PQD solids for efficient PQD solar cells (PQDSCs). Herein, protic 2-pentanol with superior ligand solubility is delicately screened from massive solvents to mediate the ligand exchange of PQDs due to its appropriate dielectric constant and acidity, which could maximize the removal of pristine insulating oleylamine ligands from the PQD surface without introducing halogen vacancy defects. Employing tailored short choline ligands and 2-pentanol solvent for the post-treatment of PQD solids, PQDSC yields an efficiency of 16.53%, which is the highest among inorganic PQDSCs. This outstanding performance is attributed to the improved charge carrier transport and surface defect passivation of PQDs. This work provides a feasible platform for tuning the surface properties of PQDs and paves the way for realizing high-performing optoelectronics.
研究领域:
材料科学
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光伏技术
·
纳米科技
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Mai Han,Song Lin,Mingyi Xu,Yueyang Jiang,Qingqing Yin,Yufan Pang,Yujian Song,Qingsong Li
In order to extract and refine tetrahydrofurfuryl alcohol (THFA) from water, this work obtained the liquid–liquid equilibrium (LLE) data of THFA in the aqueous solution using 4-Methyl-2-pentanone (MIBK) and 4-Methyl-2-pentanol (MIBC) at 303.2 K, 313.2 K, and 323.2 K under 101.3 kPa. The distribution coefficient ( D ) and selectivity coefficient ( S ) were used to evaluate the effect of extracting THFA from an aqueous solution, and it is found that both two solvents are excellent for the extraction of THFA. The Othmer-Tobias and Hand equations were used to verify the reliability of the LLE data with the linear coefficient was greater than 0.99%. The NRTL and UNIQUAC models successfully correlated the experimental data with the RMSD% values less than 0.57% and 0.56%, respectively. The GUI-MATLAB tool was used to verify the excellent reliability of the regression parameters.
研究领域:
化学工程
·
热力学
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
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