ENERGY & FUELS
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2018
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IF 3.024
Yongtao Wang,Yuhao Zhang,Feng Chen,Meng Zheng,Liang Zhao,Jinsen Gao,Tianzhen Hao,Chunming Xu
In order to disclose the separation of olefins from aromatics or thiophene compounds by organic solvents, vapor–liquid equilibrium data for ternary systems of olefins + aromatics/thiophenes + sulfolane (SUL) /N-methyl-2-pyrrolidone (NMP) were investigated at atmospheric pressure in a modified Rose dual-circulating vapor–liquid distiller. This work primarily focused on studying the relationship between separation efficiency on olefins and the structure and concentration of olefins and aromatics. From the point view of structure, the results showed that more methyl existing on both olefins and aromatics could lead to stronger hydrogen bond interaction with solvents than that of olefins and aromatics, which do not include methyl in their molecular structure. So there was higher olefin-separating efficiency for the systems containing 1-hexene (HEX)/3-methylthiophene (MTHI)/1,2,4-trimethylbenzene (TMB) than those of 2,4,4-trimethylpentene (TMP)/thiophene (THI)/toluene (TOL), respectively. Besides, when it came to the concentration of olefins or aromatics in model gasoline, the effect of separating olefin appeared remarkable when the concentration of olefins was below 40% or the concentration of aromatics was above 60%. When the separation effect of solvents was compared, the SUL outperformed the NMP because of the large relative volatility observed for the systems of “HEX + THI/MTHI/TOL/TMB”. It is worth noting that the two oxygen atoms on SUL locating the same orientation help form stronger hydrogen bonds between compounds and SUL than that of NMP. These findings powerfully facilitated the structure–effect relationship for separation of olefins from aromatic chemical compounds, which give a clear direction for upgrading of clean gasoline by efficient separation of olefins and removal of sulfides from FCC gasoline.
研究领域:
化学工程
·
石油炼制
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Saiyu Yang,Zicheng Yin,Xianchun Chen,Zhide Geng,Bo Wang,Junwen Zhou,Lu Wang
Conventional methods for synthesizing nano-sized metal-organic frameworks (nano-MOFs) often rely on additives or extra conditions, overlooking the critical role of solvents. Here, we highlight tetramethylene sulfone (TMS, or sulfolane) as a versatile solvent for nano-MOF synthesis. TMS forms strong solvation structures with metal ions and inhibits ligand deprotonation, enabling control over particle size. Using TMS, we synthesized ZIF-65 [Zn(2-nIm)2, 2-nIm = 2-nitroimidazole], ZIF-8 [Zn(2-mIm)2, 2-mIm = 2-methylimidazole], UiO-66 [Zr6O4(OH)4(BDC)6, BDC = 1,4-dicarboxybenzene acid], and MOF-199 [Cu3(BTC)2, BTC = 1,3,5-benzenetricarboxylic acid] with significantly smaller particle sizes compared to traditional solvents like ethanol (EtOH). Systematic analysis on the growth of ZIF-65 revealed distinct growth behaviors: in TMS, slower kinetics allowed the coexistence of nucleation and growth over an extended period, leading to an increase in particle number while maintaining relatively constant size; in contrast, EtOH promoted rapid growth followed by Ostwald ripening, resulting in larger particles and reduced particle number over time. By adjusting reactant concentration, metal-to-ligand ratio, and reaction temperature, we achieved facile size modulation of ZIF-65 nanoparticles. This work underscores the importance of solvents in nano-MOF synthesis and offers a robust strategy for tailoring MOF particle size, advancing applications in catalysis, biomedicine, and beyond.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Qiurong Tian,Zihao Zhang,Feng Zhou,Kequan Chen,Jie Fu,Xiuyang Lu,Pingkai Ouyang
The role of solvents in the conversion of oleic acid over Pt/C was studied. Three solvent systems (solvent-free, water, and dodecane systems) were employed for the conversion of oleic acid over Pt/C at 350 °C. Decarboxylation, hydrogen transfer, and aromatization were observed in these three reaction systems. In comparison to the non-solvent reaction system, much slower decarboxylation and aromatization rates and fewer heptadecane and aromatic products were observed in the hydrothermal and dodecane reaction systems. The decarboxylation and aromatization rates and yields of heptadecane and aromatics decreased with increased dodecane loading in the dodecane reaction system, and the decarboxylation and aromatization rates and yields of heptadecane and aromatics significantly decreased with the increase of water in the hydrothermal reaction system. The effects of solvent loading, catalyst loading, and reaction time on the reactions (decarboxylation, hydrogen transfer, and aromatization) were investigated. The reaction behaviors of 1-heptadecene with different solvents were studied, and N2 adsorption–desorption and thermogravimetric analysis of fresh and spent Pt/C in the three reaction systems were also performed. The results indicate that the competition of dodecane for the Pt/C active sites is mainly responsible for the slow decarboxylation and aromatization rates. In addition to the similar influencing factor to that in the dodecane system, H+ released from water and hydrogen bonding, which inhibited the ionization of carboxyl groups, was the key influencing factor for the slower decarboxylation and aromatization rates obtained under hydrothermal conditions.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Shijie Xu,Yaqing Bu,Shuwan Jiang,Penghui Yang,Yanfei Wang
In this paper, the nucleation behavior of glutaric acid (GA) in solvents with different hydrogen-bond donating (HBD) capabilities was studied using a metastable zone width (MSZW) experiment and modified Sangwal’s theory. Through designing different cooling rates, saturation temperatures, and solvents with different HBD capabilities, it is demonstrated that the MSZWs increase when increasing the cooling rate or decreasing the saturation temperature or increasing the HBD capability. Interestingly, under the framework of the classical nucleation theory, we find that the critical nuclei size and critical Gibbs free energy do not monotonically change with the increase of driving force in the three solvents, which means that the solid–liquid interface energy changes with the driving force. Finally, we suggest that with increasing HBD capability, desolvation of glutaric acid becomes more and more difficult, thus leading to a wider metastable zone width, which indicates that desolvation may be the rate-determining step in the nucleation process.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Yuechao Cao,Jiawei Lin,Shengzheng Guo,Xuxing Wan,Zhenkai Cen,Songgu Wu,Junbo Gong
Organic polar crystals (OPCs) are the foundation for photonic and non-linear optical applications in advanced materials. High-quality crystals are a key in achieving efficient performance for OPCs. This work explores the properties and mechanisms of OPC growth along the polar axis. Melt microdrop growth experiments confirm that asymmetric growth is an inherent property of OPCs and relates to the intrinsic crystal structure. Notably, the solvent also plays a non-negligible role in OPCs growth. Solvent-crystal face interactions are strongly influenced by the crystal face structure. A rough surface has a slower growth rate, and a specific recognition of the solvent molecules. Asymmetric growth correlates with the modified attachment energy model and reveals the role of the solvent in inhibiting of crystal growth. Finally, the growth pattern in different solvents is explained by the interfacial adsorption model. This work will further enrich the asymmetric growth mechanism of OPCs and provide guidance for obtaining high-quality OPCs in solution.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Jingbo Qi,Xianyong Sun,Si-Fu Tang,Yuanyuan Sun,Chen Xu,Xiaoyu Li,Xuebing Li
The hydrodeoxygenation (HDO) of phenols to hydrocarbons is a very promising technique process for the lignin valorization. To reveal the role of reactant, solvent and catalyst, the HDO experiments of eugenol to hydrocarbons were carried out at 523 K under 3 MPa H 2 over Ni catalysts supported on activated carbon (AC) and MFI-type zeolites in polar water and nonpolar n-hexane, respectively. It was found that Ni/AC was more efficient for the HDO of eugenol in water than in n-hexane, but Ni/HZSM-5 was just the opposite. The respective roles of Brønsted acid sites and Lewis acid sites on supports were also investigated by employing NaZSM-5, HZSM-5 and silicalite-1 as supports. It was revealed that Brønsted acid showed superior advantages (TOF: 37.9 h −1 to 11.1 h −1 ) over Lewis acid in the dehydration of 4-propyl-cyclohexanol. Oxygen-containing functional groups could be removed from the aromatic ring completely over Ni/HZSM-5 in n-hexane.
研究领域:
化学工程
·
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）