JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
·
IF 2.089
Xuejun Huang,Yao Chen,Changwei Wang,Hui Wang
Mutual solubility data of water + pentan-1-ol and liquid−liquid equilibrium of water + pentan-1-ol +2,6,6-trimethylbicyclo[3.1.1]hep-2-ene (α-pinene) and water + pentan-1-ol + 6,6-dimethyl-2-methylenebicyclo[3.1.1]heptane (β-pinene) have been measured experimentally at (293.15, 303.15, 313.15, and 323.15) K under atmospheric pressure. The estimated uncertainty of phase composition and temperature were about (0.0005 and 0.05) K, respectively. The experimental ternary liquid−liquid equilibrium data have been simultaneously predicted and correlated by the extended and modified UNIQUAC models.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2009
·
IF 2.063
Dongwei Wei,Lishuo Wang,Chao Zhang
Solid−liquid equilibria have been measured for binary mixtures of 1,8-cineole with p-cymene, β-pinene, and camphene, respectively, using differential scanning calorimetry (DSC) over the whole composition concentration range. All three are simple eutectic systems. The eutectic point of the (1,8-cineole (1) + p-cymene (2)) mixture is at 200.0 K and x1 = 0.124, the (1,8-cineole (1) + β-pinene (2)) mixture at 205.6 K and x1 = 0.154, and the (1,8-cineole (1) + camphene (2)) mixture at 251.8 K and x1 = 0.582. An empirical equation of Ott and Goates was used for correlating the experimental data.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Xing Chu,Dan Zhou,Dan Li,Kun Xia,Ning Gan,Xinhuan Lu,Renfeng Nie,Qinghua Xia
This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl 2 on MCM-41, followed by calcination . Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD , SEM, TEM, N 2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated species in high dispersion on the surface of MCM-41. NH 3 -TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation.
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
Arabian Journal of Chemistry
·
2023
·
IF 6
Haijun Cheng,Min Liang,Suyi Dai,Xianrui Lu,Qilin Huang,Fang Lai,Li Ma,Weiguang Li,Xiongmin Liu
α-Pinene, β-pinene and turpentine are renewable resources that are widely used in fine chemicals, fuels and other applications, and the safety of their production, transport and use should be considered. In this work, the characteristics and hazardous of the oxidation process of α-pinene, β-pinene and turpentine were investigated by using a novel mini closed pressure vessel testing system (MCPVT). The oxidation products were resolved by gas chromatography-mass spectrometry (GC–MS). The results showed that α-pinene, β-pinene and turpentine were stable under nitrogen atmosphere and very active chemically under oxygen atmosphere. The activation energies ( E a ) of α-pinene, β-pinene and turpentine were calculated to be 78.87, 109.69 and 98.82 kJ/mol, respectively, using pressure–time (P-t) curves. So, the reaction activity sequence was α-pinene > turpentine > β-pinene. The peroxide concentrations of α-pinene (363 K), β-pinene (358 K) and turpentine (363 K) could reach 81.94, 84.70 and 75.76 mmol/kg, respectively, at relatively low temperatures. 0.6 g of α-pinene exploded at a system temperature of 369 K and an oxygen pressure of 1.23 MPa. 0.6 g of β-pinene also exploded at a system temperature of 373 K and an oxygen pressure of 1.27 MPa. 0.4 g of turpentine experienced thermal runaway at a system temperature of 384 K and an oxygen pressure of 0.81 MPa. The major oxidation products of α-pinene are α-campholenaldehyde, laevo-pinocarveol, verbenol, verbenone, bicyclo (3.1.1)heptane-2, 3-diol, 2, 6, 6-trimethyl, 2-cyclohexen-1-ol, 2-methyl-5-(1-methylethenyl)-, (1R,5R)-rel-, cyclobutaneacetic acid, 3-acetyl-2, 2-dimethyl, myrtenol and myrtenal. The major thermal runaway products are water, ethanol, acetone, acetic acid, 2-pentanone, propyl acetate, toluene, cymene and methylacetophenone. The major oxidation products of β-pinene are nopinone, laevo-pinocarveol, pinocarvone, myrtenol, myrtenal and perillyl alcohol. The major thermal runaway products are water, ethanol, acetone, n-ethyl propanoate, toluene, butyl acetate, cymene, apocamphor, nopinone, bornyl formate, methylacetophenone and dihydronopol. The oxidation products and thermal runaway products of pinene were significantly different. Possible reaction pathways for α-pinene and β-pinene are proposed.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Yingqi Zhao,Zhaoyan Zhang,Ya Zhao,Chong Wang,Hua Xie,Jiayue Yang,Weiqing Zhang,Guorong Wu,Gang Li,Ling Jiang,Xueming Yang
It is highly challenging to precisely compare the impacts of anthropogenic pollutants on the photooxidation of isomeric volatile organic compounds with respect to molecular compositions and particle number/mass concentrations of secondary organic aerosols (SOAs). In this study, we conducted a series of well-defined indoor chamber experiments to compare the effects of NO x (NO and NO 2 ) on the photooxidation of isomeric monoterpenes of β -pinene and limonene. For the photooxidation of β -pinene with NO x , the increase of the initial concentrations of NO ([NO] 0 ) shows a monotonous suppression of the particle mass concentration, whereas the increase of [NO 2 ] 0 shows a monotonous enhancement of the particle mass concentration. For the photooxidation of limonene with NO x , the increase of [NO] 0 exhibits a monotonous suppression of the particle mass concentration, whereas the increase of [NO 2 ] 0 shows a parabolic trend of the particle mass concentration. Utilizing a newly developed vacuum ultraviolet free electron laser (VUV-FEL), the online threshold photoionization mass spectrometry reveals a series of novel compounds at molecular weight (MW) = 232 and 306 for the β -pinene + NO x system and MW = 187, 261, 280, and 306 for the limonene + NO x system. The molecular structures and formation pathways of these species were inferred, which led to the prediction of the diversity and difference of SOA products (i.e., ester and peroxide accretion products) formed from different monoterpene precursors. To improve the predictions of future air quality, it is recommended that climate models should incorporate the NO x -driven diurnal photooxidation of monoterpenes for SOA formation mechanisms.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2022
·
IF 2.267
Zuojian Zhang,Haijie Wang,Bo Yang,Jinian Shu,Zhangqi Yu,Zhiyang Wei,Jingyun Huang,Kui Jiang,Yedong Guo,Zhen Li
Recently, photoinduced associative ionization (PAI) has been demonstrated to be extremely efficient for the determination of oxygenated volatile organic compounds. However, its application for the determination hydrocarbons has not yet been reported. In this study, associative ionization of nine typical monoterpenes induced by dichloromethane (CH2Cl2) under vacuum ultraviolet (VUV) light was investigated using a laboratory-constructed PAI time-of-flight mass spectrometer (PAI-TOFMS). Without doping CH2Cl2, VUV light generated ordinary photoionization mass spectra of monoterpenes that were dominated by fragment ions, while the molecular ions were inconspicuous. In contrast, doping with CH2Cl2 resulted in the appearance of mass peaks of the characteristic protonated molecular ions of the monoterpenes. The PAI method significantly enhanced the signals for the monoterpenes. The intensities of protonated molecular ions derived from PAI were amplified by 52 to 108 fold compared with those of molecular ions produced by VUV photoionization (VUV PI). With the high ionization efficiency of PAI toward monoterpenes, the sensitivities of PAI-TOFMS toward limonene, β-ocimene, β-myrcene, β-pinene, and α-pinene were from 291 ± 6 to 1338 ± 20 counts pptv−1 using an acquisition time of 30 s. The limits of detection were from 0.32 to 1.45 pptv, equivalent to between 1.92 and 8.83 ng m−3. The applicability of this ionization mode was further characterized by the determination of monoterpenes from potted Sabina chinensis. This study provides a new and highly efficient ionization method for the determination of plant monoterpenes using mass spectrometry.
研究领域:
分析化学
·
环境科学
·
质谱学
·
植物科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2012
·
IF 2.422
Yao Chen,Hui Wang,Yanyan Tang,Jun Zeng
Ternary (liquid + liquid) equilibria date for the (water + 2-propanol + α -pinene, or β -pinene) systems were measured at T = (293.15, 298.15, 303.15, and 308.15) K under atmospheric pressure. The experimental results were correlated using the extended and modified UNIQUAC models. The calculated results obtained from the modified UNIQUAC model successfully represent the experimental tie-line data. The temperature influence on liquid-phase equilibria was studied.
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
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
·
2022
·Vol. 76
·期 12
·1-10
·
IF 2.944
Li Chengzhe,Wang Hua,Chen Xiaoming,Yao Jun,Deng Jianyu
Abstract Butterflies use visual and olfactory cues to identify conspecifics during courtship. Tirumala limniace , Idea leuconoe , and Danaus chrysippus are three species of butterflies with a sympatric distribution, and T. limniace butterflies are rarely seen to chase I. leuconoe or D. chrysippus during courtship in artificial cultivation gardens, indicating that they have a mechanism for recognizing conspecifics; however, there are no reports on what kind of signals they use to recognize conspecifics. In this study, we investigated the cues used by T. limniace to identify conspecifics and the relative roles of visual and olfactory cues. We found that in the absence of olfactory cues (visual cues only), male and female butterflies were able to identify the same species based on wing color and pattern. By collecting and identifying body volatiles emitted from T. limniace males and females, we found that the highest amounts were β -ocimene and β -pinene, which were sourced from the insects’ bodies (as opposed to sex pheromones). Furthermore, electroantennogram binding behavioral experiments showed that β -ocimene was involved in the process of species recognition and that the relative roles of olfactory cues were greater than those of visual cues at close range. Therefore, T. limniace males and females could utilize both visual and olfactory cues to identify conspecifics during courtship but preferred olfactory cues. The present study highlighted the important role of adult body odor rather than sex pheromones in butterfly species recognition. Significance statement Butterflies use visual (wing color and pattern) and olfactory (sex pheromones) cues to identify conspecifics during courtship. Butterflies also release volatiles emitted from their bodies during courtship. However, there is no clear evidence that body volatiles (as opposed to sex pheromones) emitted from butterflies are involved in species recognition. We studied the functions of body volatiles emitted from Tirumala limniace adults and the relative roles of visual and olfactory cues in species recognition during courtship. We found that male and female adults could identify conspecifics using only visual cues. Meanwhile, we also found that the highest amounts of β -ocimene, which came from the bodies of T. limniace males and females, were also involved in the process of species recognition. The olfactory cues that butterflies use to identify conspecifics are usually sex pheromones, while the present study highlighted the important role of adult body odor rather than sex pheromones in butterfly species recognition.
研究领域:
昆虫学
·
生态学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Xiangyu Zang,Zhaoyan Zhang,Yingqi Zhao,Gang Li,Hua Xie,Weiqing Zhang,Guorong Wu,Xueming Yang,Ling Jiang
Elucidating the effects of anthropogenic pollutants on the photooxidation of biogenic volatile organic compounds is crucial to understanding the fundamental mechanisms of secondary organic aerosol (SOA) formation. Here, the impacts of NO 2 and SO 2 on SOA formation from the photooxidation of a representative monoterpene , β -pinene, were investigated by a number of laboratory studies. The results indicated NO 2 enhanced the SOA mass concentrations and particle number concentrations under both low and high β -pinene conditions. This could be rationalized that the increased O 3 concentrations upon the NO x photolysis was helpful for the generation of more amounts of O 3 -oxidized products, which accelerated the SOA nucleation and growth. Combing with NO 2 , the promotion of the SOA yield by SO 2 was mainly reflected in the increase of mass concentration, which might be due to the elimination of the newly formed particles by the initially formed particles. The observed low oxidation degree of SOA might be attributed to the fast growth of SOA, resulting in the uptake of less oxygenated gas-phase species onto the particle phase. The present findings have important implications for SOA formation affected by anthropogenic–biogenic interactions in the ambient atmosphere.
研究领域:
大气科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Huidong Zheng,Jinliang Chen,Chao Li,Jingjing Chen,Yingshu Wang,Suying Zhao,Yanru Zeng
Myrcene, an important intermediate for the production of fine chemicals and pharmaceuticals, is mainly produced by the pyrolysis of β-pinene in the industry. The study of the direct pyrolysis of β-pinene was carried out without a catalyst and carrier gas at 573–873 K and under low pressure. In order to clarify the reaction mechanism, the primary intermediates of β-pinene pyrolysis including myrcene and limonene were also used as raw materials for further pyrolysis. The identification of some small molecules and C 10 H 16 isomers in the products proves that both decomposition reaction and ene reaction take place during the pyrolysis process. Based on the qualitative and quantitative analysis of reaction products, a reaction scheme for the pyrolysis of β-pinene was proposed. With appropriate simplification of the reaction scheme, a phenomenological kinetic model of the competitive parallel and consecutive first-order reaction was built, and exhibited good agreement with the experimental data. The activation energy ( E a ) and pre-exponential factor ( k 0 ) for each pathway were also determined.
研究领域:
化学工程
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Xuewen Guo,Xin Liu,Shaoyun Shan,Wenbo Zhao,Hongying Su,Qingming Jia
With pressing environmental concerns and incessant depletion of fossil reserves, producing sustainable polymeric materials to become a research target. In this work, we prepare a bio-based polymer from a naturally occurring monoterpene (β-myrcene) and sulfur dioxide which can be captured from industrial waste gas. The structure of the synthesized polymer was ascertained by IR and NMR. The initiator initiated poly(myrcene-co-SO 2 ) possesses four kinds of microstructure, 1,4-cis and 1,4-trans are the main structures, and the contents of 1,2-vinyl and 3,4-addition microstructure are extremely low. Solubility behavior, thermal degradation and optical properties of poly(myrcene-co-SO 2 ) were characterized by theoretical solubility parameter, TG and Abbe-type refractometer. Moreover, we report the adhesive properties of the polymer on glass, wood, aluminum and copper. Due to hydroxyl groups on the surface of the material, poly(myrcene-co-SO 2 ) exhibits outstanding adhesion properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Shiyu Wu,Yufu Yi,Shengliang Liao,Hongyan Si,Yuling Yang,Guorong Fan,Peng Wang
We described the comprehensive synthesis, characterization, and catalytic performance of a novel type of the ordered cubic Ia3̅d supermicroporous silicas by using tetraethyl orthosilicate as a silicon source and a hydroxyl-functionalized quaternary ammonium salt as a template under alkali conditions. The effects of various reaction conditions on the pore structure and morphology of the silica materials were thoroughly investigated. Our results showed that under a wide range of reaction conditions, supermicroporous silicas with a highly ordered cubic Ia3̅d structure can be produced with a large BET specific surface area of 1741 m2/g, high pore volume of 0.91 cm3/g, concentrated pore size at 19.1 Å, and crystalline morphology. After Al doping, the obtained aluminosilicates preserved a highly ordered cubic supermicroporous structure. By using the H-form aluminosilicates as catalysts, we selectively dimerized β-pinene. The catalysts exhibited an excellent catalytic activity for β-pinene dimerization with a conversion yield up to 100%. Compared with conventional mesoporous H-form Al-MCM-48 catalysts, the prepared supermicroporous catalysts exhibited superior catalytic performance due to their excellent shape-selective properties, producing the β-pinene dimer in a yield up to 72.4% with dimer/oligomer ratios in the range of 7.5–10.1. This study featured a detailed preparation and characterization of supermicroporous silica with novel microstructures and showed its utility in catalytic dimerization.
研究领域:
材料科学
·
催化化学
✓ 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）