JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Lingxiao Cai,Jiajia Yin,Xiaopo Wang
The density and viscosity of binary mixtures of polyoxymethylene dimethyl ethers (PODEn) with three 1-alcohols (1-propanol, 1-butanol, and 1-pentanol) were investigated in this work from 303.15 to 333.15 K and at atmospheric pressure. The measurements were conducted by a vibrating-tube method for density and a capillary-tube method for viscosity. The densities and viscosities of the mixtures were correlated by the Jouyban–Acree model and McAllister four-body model, respectively. In addition, the excess molar volumes and the viscosity deviations of the mixtures were computed and correlated by the Redlich–Kister equation, and the discussion about the excess molar volumes and viscosity deviations was carried out.
研究领域:
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Hao Wang,Nianzu Zhang,Xiaopo Wang
In this work, the density and viscosity data for binary mixtures of dimethyl carbonate with 1-heptanol, 1-octanol, 1-nonanol, and 1-decanol were presented from 303.15 K to 333.15 K at atmospheric pressure over different concentration ranges. The density and viscosity measurement was carried out based on the vibrating-tube densimeter and Ubbelohde capillary viscometer, respectively. Derived properties, such as excess molar volumes and viscosity deviations, were calculated from the experimental values, and were correlated based on the Redlich-Kister equation. In addition, excess molar volumes and viscosity deviations of the studied mixtures were analyzed and compared with other DMC/1-alcohols mixtures reported in the literatures.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xin Song,Fangjun Shao,Zijiang Zhao,Xiaonian Li,Zhongzhe Wei,Jianguo Wang
Precise regulation of reaction selectivity at high conversions is the key to non-terminated alkyne semi-hydrogenation. Herein, a support modification strategy was employed to incorporate trace amounts of Mg elements into alumina support. The modified support loaded Pd catalyst optimized the activity and selectivity of the non-terminated alkyne semi-hydrogenation reaction. The TEM and XRD characterization of the catalysts demonstrated the entry of Mg elements into the Al 2 O 3 lattice to achieve the modification of the support. For the 2-butyne-1-ol semi-hydrogenation reaction, the Pd 0.5 /Mg 1 @Al 2 O 3 catalyst showed 99 % conversion and 97 % selectivity of the cis product at hydrogen pressure of 0.1 MPa and 25 °C. The introduced Mg element changed the electronic structure of Pd nanoparticles in the catalyst. The precise regulation of the 2-butyne-1-ol semi-hydrogenation reaction was achieved by adjusting the ratio of Pd 0 to Pd 2+ using the synergistic effect of Pd 0 and Pd 2+ .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Yinyin Liao,Haibo Tan,Guotai Jian,Xiaochen Zhou,Luqiong Huo,Yongxia Jia,Lanting Zeng,Ziyin Yang
Tea (Camellia sinensis) is the most popular nonalcoholic beverage worldwide. During cultivation, tea plants are susceptible to herbivores and pathogens, which can seriously affect tea yield and quality. A previous report showed that (Z)-3-hexenol is a potentially efficient defensive substance. However, the molecular mechanism mediating (Z)-3-hexenol signaling in tea plants and the resulting effects on plant defenses remain uncharacterized. To clarify the signaling mechanisms in which (Z)-3-hexenol and light are involved, the gene transcription and metabolite levels were assessed, respectively. This study demonstrated that tea plants rapidly and continuously release (Z)-3-hexen-1-ol in response to an insect infestation. (Z)-3-Hexen-1-ol absorbed by adjacent healthy plants would be converted into three insect defensive compounds: (Z)-3-hexenyl-glucoside, (Z)-3-hexenyl-primeveroside, and (Z)-3-hexenyl-vicianoside identified with laboratory-synthesized standards. Moreover, (Z)-3-hexen-1-ol also activates the synthesis of jasmonic acid to enhance the insect resistance of tea plants. Additionally, a continuous light treatment induces the accumulation of (Z)-3-hexenyl-glycosides. Hence, (Z)-3-hexenol serves as a light-regulated signaling molecule that activates the systemic defenses of adjacent plants. Our study reveals the molecular mechanisms by which biotic and abiotic factors synergistically regulate the signaling functions of herbivore-induced plant volatiles in plants, providing valuable information for future comprehensive analyses of the systemic defense mechanisms in plants.
研究领域:
植物学
·
分子生物学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Shengchao Xu,Wanting Ma,Qifeng Wei,Xiulian Ren
Long-chain 1-alkanols and N-dodecyl-2-pyrrolidone (NDP) exhibit significant potential in the field of solvent extraction. Investigating their physicochemical properties is valuable for understanding mass transfer, heat transfer, and the fluid transport process. In this study, we investigated the effect of the alkyl chain length of 1-alkanols (C4/C6/C8/C10) on NDP organic liquid mixtures. The densities and viscosities were measured at temperatures ranging from 303.15 to 323.15 K and atmospheric pressure. Excess properties, including excess molar volume (VmE), viscosity deviation (Δη), and the excess Gibbs free energy of activation of viscous flow (ΔG*E), were calculated and correlated by Redlich–Kister equation to identify the differences between real and ideal solutions. It was found that the steric hindrance increased with the alkyl chain length increasing from C4 to C10 for 1-alkanols, leading to weaker molecular interactions in the mixtures. Furthermore, the Fourier transform infrared spectroscopy (FT-IR) and UV–vis spectra confirmed the presence of intermolecular hydrogen bond interactions between the −OH group of 1-alkanols and the –C═O group of NDP. Finally, the conductor-like screening model for realistic solvation (COSMO-RS) and Gaussian spectra further proved the hydrogen bond interactions. Overall, this study reported a range of physicochemical properties from both experimental and theoretical perspectives, which can be used to guide industrial production.
研究领域:
物理化学
·
分子相互作用
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Nan Li,Changping Jian,Yaping Song,Li Wang,Ata Ur Rehman,Yanghe Fu,Fumin Zhang,De-Li Chen,Weidong Zhu
Herein, we reported a facile and scalable approach for the synthesis of Fe-based MOF MIL-88A(Fe) via a simple liquid-phase route at atmosphere pressure, and its application as a heterogeneous catalyst for the efficient aerobic oxidation of cyclohexene to value-added 2-cyclohexene-1-ol. Over 130 g of spindle-shaped MIL-88A(Fe) nanocrystals with high crystallinity, monodispersed particle size, and large specific surface area were easily synthesized per batch according to our method. The resultant MIL-88A(Fe) exhibited a high catalytic activity (conversion: 81%) with 70% selectivity for 2-cyclohexene-1-ol in the aerobic oxidation of cyclohexene with O 2 as the sole oxidant under mild reaction conditions (0.5 MPa of O 2 , 353 K for 8 h), outperforming the analogues reported in the literatures. The combined experimental and theoretical approach support the reaction mechanism of the oxidation of cyclohexene via both the free radical reaction pathway and Fe-mediated reaction pathway, resulting in the selective formation of 2-cyclohexene-1-ol.
研究领域:
材料科学
·
催化化学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2019
·Vol. 32
·期 3
·306-312
·
IF 0.791
Yu Ye-peng,Li Zhao-hui,Lin Xuan,Chen Jun,Zhang Hang,Li Yan-bo,Wang Huang-huang,Sun Rui-rui,Meng Qing-hui,Shan Xiao-bin,Liu Fu-yi,Sheng Liu-si
The photoionization and dissociation of 2-methyl-2-propen-1-ol (MPO) have been investigated by using molecular beam experimental apparatus with tunable vacuum ultraviolet synchrotron radiation in the photon energy region of 8.0–15.5 eV. The photoionization efficiency (PIE) curves for molecule ion and fragment ions: C 4 H 8 O + , C 4 H 7 O + , C 3 H 5 O + , C 4 H 7 + , C 4 H 6 + , C 4 H 5 + , C 2 H 4 O + , C 2 H 3 O + , C 3 H 6 + , C 3 H 5 + , C 3 H 3 + , CH 3 O + , CHO + have been measured, and the ionization energy (IE) and the appearance energies (AEs) of the fragment ions have been obtained. The stable species and the first order saddle points have been calculated on the CCSD(T)/cc-pvTZ//B3LYP/6-31+G(d,p) level. With com-bination of theoretical and experimental results, the dissociative photoionization pathways of 2-methyl-2-propen-1-ol are proposed. Hydrogen migrations within the molecule are the dominant processes in most of the fragmentation pathways of MPO.
研究领域:
化学物理学
·
分子光谱学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 7
·685
·
IF 4.501
Hao Dong,Cheng-Hua Xu,Fang-Lu Yang,Lei Du,Chen-Long Liu,Wen-Jing Chen,Lin Wang
Ca–Zr–Sn composite oxides catalysts for 1,4-butanediol (BDO) selective dehydration to 3-butene-1-ol (BTO) are synthesized by impregnation and co-precipitation in the present work. The results show that Ca–Zr–Sn catalysts prepared from co-precipitation by using NaOH-Na2CO3mixing alkali solution as precipitant exhibit an excellent catalytic property for BDO dehydration to BTO. For instance, Ca–Zr–Sn oxide with Ca/Zr and Sn/Zr molar ratio of 0.68 and 0.28 calcined at 650 °C gives a BDO conversion and BTO selectivity of about 97% and 82%, respectively, and exhibits no deactivation during 1000 h scale-up experimental testing. X-ray diffraction results indicate that catalytic active centers for BDO dehydration to BTO are from Ca0.15Zr0.85O crystal phase. NH3- and CO2-temperature programmed desorption prove that the surface of obtained catalysts can provide a large amount of acid and base sites simultaneously. FT-IR spectra of pyridine-adsorbed samples show that acid sites on the surface of Ca–Zr–Sn oxide catalyst mainly exist in a state of Lewis acid, which activates terminal -OH groups of BDO molecule through complexing. The activated -OH interacts with β-H activated on base sites O2−anions relative to Ca species, thereby the CH2=CH- bonds are produced through dehydration to form BTO.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 108
·107104-107108
·
IF 3.289
Y. N. Wei,H. Li,F. Yue,Q. Xu,J. D. Wang,Y. Zhang
Herein, we introduce a new strategy towards the cyclohexene oxidation reaction, which is driven by molecular oxygen with a cobalt(II)/amine acid complex as the catalyst without any solvents. The as-prepared products include cyclohexene oxide, 2-cyclohexene-1-ol and 2-cyclohexene-1-one. Under optimized conditions, the oxidation of cyclohexene with molecular oxygen yields a conversion rate of 82.5%. Notably, the catalytic oxidation system has the advantages of being clean, safe and operationally simple. Our experiment indicates that the oxidation follows a radical-chain mechanism rather than a catalytic mechanism, which reveals that 2-cyclohexene-1-hydroperoxide could play a key role in the free-radical chain reaction through a complicated but necessary product analysis.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Min Liang,Huixia Zhao,Suyi Dai,Chang Yu,Haijun Cheng,Weiguang Li,Fang Lai,Li Ma,Xiongmin Liu
1,3-Butadiene is the simplest conjugated diene, which is widely used in polymer materials, organic synthesis, and other fields. The investigation of its thermal stability and oxidation characteristics is necessary for production, transportation, and use safety. The pressure and temperature behavior of the autoxidation reaction of 1,3-butadiene with oxygen were determined using a custom-designed mini closed pressure vessel test (MCPVT). The effects of free radical initiators CHP and AIBN on the oxidation reaction were investigated. The thermal decomposition characteristics of oxidation products were measured by differential scanning calorimetry (DSC), and its hazards were discussed. The results showed that the oxidation reaction of 1,3-butadiene was easy to occur. Moreover, the activation energies of autoxidation, CHP-initiated oxidation, and AIBN-initiated oxidation reaction were 20.85 kJ·mol −1 , 33.30 kJ·mol −1 , and 56.27 kJ·mol −1 , respectively. In addition, the oxidation products were analyzed by headspace sampler-gas chromatography-mass spectrometry (HS-GC–MS), GC–MS, and iodometry. Some of 1,3-butadiene oxidation products under three conditions are the same, for example, 3-butene-1,2-diol, 4-vinylcyclohexene, 2(5H)-furanone, 2-propen-1-ol, and 2,6-cyclooctadien-1-ol. According to the reaction products, the oxidation reaction pathway of 1,3-butadiene was described. The research results are significant for avoiding fire and explosion accidents in the production, transportation, and application of 1,3-butadiene.
研究领域:
化学工程
·
有机化学
·
热分析
·
安全科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ASIA-PACIFIC ENTOMOLOGY
·
2020
·
IF 1.101
Jinhao Zhao,Zhongyan Wang,Zhongshan Li,Jiayu Shi,Ling Meng,Guorong Wang,Jingli Cheng,Yongjun Du
Aphids are among the most destructive phytophagous pests of host plants, because of their rapid reproduction, parthenogenesis, extensive crop damage, and the transmission of many plant viruses. Since lady beetles are important predatory natural enemies of aphids, developing lady beetle attractants to increase their field abundance is vital for aphid control. Floral volatiles and other semiochemicals are reportedly attractive to lady beetles. In this research, a total of 58 floral volatiles were tested by Y-tube olfactometer assays, among which 29 were highly attractive to both Harmonia axyridis (Coleoptera: Coccinellidae) and Coccinella septempunctata (Coleoptera: Coccinellidae). Meanwhile, the results of wind tunnel trials showed that only isoamyl acetate, α -humulene, trans -3-hexen-1-ol, methyl salicylate, and β -pinene lure these two species. Thereafter, 15 semiochemicals from pests, natural enemies, and pest-infested crops were mixed with the selected floral volatiles, to determine optimum formulations for attracting lady beetles through wind tunnels and further field trials. Eventually, formulas (1) α -humulene: β -pinene: methyl salicylate: trans -3-hexen-1-ol = 1:3:3:10; (5) α -humulene: β -pinene: methyl salicylate:1-nonanal = 1:3:3:10; (8) α -humulene: β -pinene: methyl salicylate: indole = 1:3:3:10 ( 1 , 5 , and 8 are labels used for the various formulations in field trials) were successfully verified to be attractive to lady beetles in both pumpkin and wheat fields. These formulations will be of great significance in developing integrated pest management strategies for aphid control.
研究领域:
昆虫学
·
农业科学
·
害虫管理
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Ruiyao Wu,Zhen Niu,Zhu Xia,Jianyun He,Chenxi Bai
The ternary copolymers of ethylene, propylene and 10-undecen-1-ol were prepared using a vanadium catalyst bearing an 8-anilide-5,6,7-trihydroquinoline ligand. By adjusting the concentration of 10-undecen-1-ol and polymerization temperature, the insertion rate of polar monomers was modulated with a maximum value of 3.8% achieved for 10-undecen-1-ol. With an increase in the hydroxyl insertion rate, the water contact angle of hydroxyfunctionalized ethylene-propylene copolymers decreased from 112.3° to 95.3°, indicating that the incorporation of 10-undecen-1-ol enhanced the hydrophilicity of the copolymers. Subsequently, a reprocessable ethylene-propylene rubber (EPR) with double dynamic bonds was synthesized through reaction between the hydroxyl group on functionalized ethylene-propylene copolymer and the crosslinking agent using isocyanate as chain end. The strength of functionalized ethylene-propylene copolymers was significantly improved through dynamic crosslinking. Significantly, the tensile strength of sample EP6-V-0.5 reached 14 MPa, which was 27 times higher than that of un-crosslinked EP6 . The prepared functionalized ethylene-propylene rubber prepared exhibited not only reprocessability, but also remarkable shape memory and reshaping properties. Moreover, the conductive composite materials based on this rubber displayed great potential for application in motion sensors.
研究领域:
高分子化学
·
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）