JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2023
·
IF 3.2
Bing Qian,Yonghua Hu,Minggao Xu,Jiuzhong Yang,Chengyuan Liu,Yang Pan
Cooking oil fumes are an intricate and dynamic mixture containing a variety of poisonous and hazardous substances, and their real-time study remains challenging. Based on tunable synchrotron radiation photoionization mass spectrometry (SR-PIMS), isomeric/isobaric compounds in the gaseous oil fumes from oleic acid thermal oxidation were determined in real time and distinguished by photoionization efficiency (PIE) curve simulation combined with multiple linear regression (MLR) analysis. A series of common carcinogens such as formaldehyde, acetaldehyde, acrolein, and several unreported chemicals including diethyl ether and formylcyclohexane were successfully characterized. Moreover, time-resolved profiles of certain components in gaseous oil fumes were monitored for 55 h. Distinct evolutionary processes were observed, indicating the consumption and formation of parent molecules, intermediates, and final products.
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高影响因子
Journal of Chemistry
·
2021
·
IF 2.506
Qiuyun Zhang,Xianju Yang,Jiali Yao,Jingsong Cheng
The impregnation of phosphotungstic acid (HPW) with porous cobalt-cerium oxide (HPW@CoCeO) has been prepared by pyrolysis of CoCe-MOF and used for the production of methyl oleate from oleic acid and methanol. FTIR, XRD, SEM, TEM, N2 adsorption/desorption, and NH3-TPD were characterized for the prepared composites. Simultaneously, the effects of reaction time, substrate molar ratio, temperature, and catalyst loading on catalytic activity were highlighted, and the conversion of 67.2% was reached after 4 h at 60°C. Importantly, HPW@CoCeO was reusabe and reused more than eight times, and the oleic acid conversion could be maintained at 61.8% without significant activity loss. Thus, the HPW@CoCeO composite could be used as acid catalysts for sustainable energy production.
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APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Tingting Zhao,Fuwei Li,Hongchang Yu,Shilei Ding,Zhixia Li,Xinyuan Huang,Xiang Li,Xiaohan Wei,Zhenlin Wang,Hongfei Lin
Conversion of biomass-derived chemicals into light olefins is a promising method to maintain sustainable development of light olefin industry. In this study, three mesoporous ZSM-5 zeolites (MZSM-5-A, MZSM-5-B and MZSM-5-C) with major pore diameter about 4.8 nm, 16 nm and 22 nm were synthesized using a hydrothermal method by utilizing different templates. The catalytic activity of catalysts was studied by catalytic cracking of ethanol and oleic acid. The influence of reaction temperature on conversion and product selectivity was investigated. The characterization of ZSM-5 samples showed that the orders of the external surface area and mesopore volume were MZSM-5-C > MZSM-5-B > MZSM-5-A > conventional HZSM-5. In ethanol to light olefin reaction, MZSM-5-C achieved the highest light olefin yield (318.3 mL g −1 ) and ethylene selectivity (42.3%) at 400 °C. In oleic acid to light olefin reaction, MZSM-5-B achieved a complete conversion of oleic acid at 500 °C, and obtained the highest light olefin selectivity (38.1%) at 550 °C. The difference may be relevant to the size and chemical structure of feedstock molecular as well as the acidity of catalysts. Regardless of ethanol or oleic acid as feedstock, introduction of mesopore in zeolites significantly enhanced the light olefin yield and selectivity.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fei Wang,Wenjuan Zhang,Jianchun Jiang,Junming Xu,Qiaolong Zhai,Linshan Wei,Feng Long,Chao Liu,Peng Liu,Weihong Tan,Daheng He
The hydrotreatment of lipids is regarded as a renewable and promising approach to produce green diesel to confront environmental issues. The molybdenum carbide catalyst displays noble metal-like activity for lipid hydrotreatment; however, the active sites on the catalyst typically have a large particle size and are unevenly dispersed, thereby severely limiting its catalytic performance. Herein, ultrafine MoC nanoparticles supported on nitrogen-rich carbon (MoC/CN) were prepared, and their activity for the hydrotreatment of oleic acid was compared with that of Mo 2 C supported on mesoporous carbon (Mo 2 C/MC). In the hydrotreatment test, the MoC/CN catalyst exhibited remarkable activity with 94.3% conversion and 90.3% selectivity at 310 °C; these values were much higher than those of the Mo 2 C/MC catalyst (84.8% and 70.1%, respectively), even at 350 °C. The excellent performance of MoC/CN is ascribed to the sufficient amounts of pyridinic N and pyrrolic N in nitrogen-rich carbon, which provide anchoring sites for the molybdenum precursor, leading to the fine particle sizes of the active sites and a uniform dispersion. The density functional theory (DFT) calculations show that MoC/CN can better facilitate the dissociative adsorption of hydrogen than Mo 2 C/MC, which explains the high activity of the Mo 2 C/MC catalyst in the hydrotreatment reaction. The carburization temperature and Mo loading content have a considerable effect on the MoC formation and surface area of the MoC/CN catalyst and thus greatly influence the catalytic activity. Moreover, the hydrotreatment conditions, including the reaction temperature and hydrogen pressure, were also investigated.
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ADVANCED POWDER TECHNOLOGY
·
2018
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IF 2.943
Junkai Cao,Xue-Zhi Song,Xiaolan Kang,Zideng Dai,Zhenquan Tan
Herein, we report a facile one-pot solvothermal method to prepare unique oleic acid (OA) modified monodispersed mesoporous TiO 2 nanospheres with carboxylate ligands from the oleic acid in the bidentate chelating linkage mode. The mesoporous OA-TiO 2 nanospheres have a very large specific surface of nearly 510 m 2 /g. The oleic acid cannot only act as a binding ligand to control the shape of mesoporous TiO 2 nanospheres, but also be benefit to enhance the visible-light absorption. The mesoporous OA-TiO 2 nanospheres exhibit an excellent photocatalytic performance in the degradation of Rhodamine B and phenol under the visible light irradiation and show almost no attenuation after four cycles.
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ChemCatChem
·
2015
·Vol. 7
·期 17
·2646-2653
·
IF 4.556
Guangci Li,Feng Zhang,Lei Chen,Chuanhui Zhang,He Huang,Xuebing Li
Graphical Basic rules! A suitable amount of basicity on the support is favorable for the conversion of oleic acid into n -alkanes mainly through hydrodecarbonylation with relatively low hydrogen consumption. The production of second-generation biodiesel with triglycerides or their derivatives through hydroprocessing is considered as a promising approach to make transportation fuels. In this study, a series of Ni-based catalysts supported on basic composite oxides (MO-Al 2 O 3 , M=Mg, Ca, Ni, Cu, Zn) were prepared for the catalytic deoxygenation of oleic acid in the presence of H 2 . Ni/ZnO-Al 2 O 3 exhibited the highest deoxygenation activity and alkane selectivity, which depended on its moderate basicity. Investigations of the reaction conditions, which include reaction time, reaction temperature, H 2 pressure, and Ni loading, suggested that n -heptadecane was the predominant product and its content increased with reaction temperature. The reaction temperature was more important than H 2 pressure in the catalytic deoxygenation of oleic acid. Additionally, the overall reaction pathways for the conversion of oleic acid were proposed based on the product distribution for different durations and reaction rates of stearic acid, 1-octadecanol, and stearyl stearate, in which the oxygen atoms in the oleic acid were mainly removed in the form of CO through a hydrogenation–dehydrogenation–decarbonylation reaction route. If glycerol trioleate was used instead of oleic acid, Ni/ZnO-Al 2 O 3 exhibited a high hydrodecarbonylation activity and selectivity to n -heptadecane.
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ENERGY & FUELS
·
2016
·
IF 2.835
Qiurong Tian,Kai Qiao,Feng Zhou,Kequan Chen,Tianfu Wang,Jie Fu,Xiuyang Lu,Pingkai Ouyang
We herein report an atom-economic approach to produce aviation fuel range hydrocarbons and aromatics from oleic acid without an added hydrogen donor. The effects of catalyst loading, reactant loading, and reaction temperature on the conversion of oleic acid and the yields of hydrocarbons and aromatics were investigated. The conversion of oleic acid was 100%, and the yield of heptadecane (the main product) can reach 71% after 80 min at 350 °C. Moreover, an aromatics yield of 19% was determined, which is the critical composition of the aviation fuels due to their ability to maintain the swelling of fuel system elastomers, indicating that it is a complicated reaction system including in situ hydrogen transfer, aromatization, decarboxylation, and cracking. To probe the mechanism of the conversion of oleic acid without an added hydrogen donor, variations of the reactant and products as time elapsed at different temperatures and the reaction behavior of 1-heptadecene and stearic acid at 350 °C in the catalysis system were investigated. The main mechanism proposed was that oleic acid was decarboxylated to 8-heptadecene, followed by the dehydrogenation of 8-heptadecene to polyenes. Then, polyenes were cyclized to aromatics by an intramolecular Diels–Alder reaction, which provided hydrogen to hydrogenate the unreacted oleic acid to stearic acid. Finally, stearic acid was decarboxylated to heptadecane.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2024
·
IF 3.6
Siqi Li,Di Wang,Meng Zhang,Ying Yang,Xiangyu Zhang,Jinlian Li,Dongmei Wu
Biocompatible fatty acids are natural biological materials which exhibit widespread biomedical applications. Nevertheless, their application in vesicle forms is hampered by strong pH sensitivity and poor stability to changes in ionic strength, temperature, and storage. In the investigation, the incorporation of alkyl glycoside (APG), a surfactant with non-ionic properties, into the oleic acid (OA) vesicles was undertaken as a means to address this issue. The newly formed OA/APG composite vesicles form in a pH range of between 5.4 and 7.4, which is close to the pH range of the physiological environment. The stability studies results showed that the OA/APG composite vesicles have excellent stability in terms of ionic strengths, temperature and storage. The formation of NAR-loaded OA/APG composite vesicles was demonstrated through FT-IR, DSC and XRD. In vitro topical delivery and skin retention studies confirmed that the composite vesicles improve skin permeation rate and have better skin permeation behavior. Antioxidant activity experiments confirmed that the antioxidant effect composite vesicles were significantly increased as compared to the naringenin (NAR). This finding has theoretical implications for the use of drug-loaded fatty acid vesicles in cosmetics industries and topical delivery systems.
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NANOTECHNOLOGY
·
2024
·Vol. 36
·期 9
·095203
·
IF 2.9
Xiaozong Huang,Wen Li,Linghang Kong,Xiaoyan Lu,Chengzhi Yang,Bingsuo Zou
Due to the easy transformation to the non-luminous yellow δ-CsPbI3 phase in air, α-CsPbI3 nanocrystalline materials with red light emission find limited applications. Lifting its structural stability is a challenge in its quantum dot (QD) lighting field. Here we studied the doping of Mn2+ ions (5.0%) and processing by a small amount (0.315 ml) of TOP molecules on the OA-capped CsPbI3 nanocrystals. It is found that after the successful introduction of Mn2+ into the CsPbI3 nanocrystal, the grain size reduces, which leads to a stronger quantum confinement effect than the undoped QDs, which leads to the blue shift of PL and absorption spectra. The incorporation of Mn2+ simultaneously reduced defects and lifted the luminescence efficiency and lifetimes of QDs, the cause for the above optical behavior is due to the formation of excitonic magnetic polaron (EMP) excitons near the bandedge. On the other hand, the treated TOP molecule on the OA-capped NCs did not significantly affect their room-temperature luminescence. However, it improved the low-temperature emission performances of QDs significantly. Moreover, the TOP-treated QDs fixed in the PMMA film can transform into rod-like shapes in acidic environments, giving strong stability for emission, especially for the Mn-doped CsPbI3 QDs. This work has been done to improve the stability and emission efficiency of related QDs through the EMP formation near band-edge and surface modification of CsPbI3 NCs, favoring their potential applications in display and low-temperature light-emitting devices.
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Sustainable Energy & Fuels
·
2024
·Vol. 9
·期 1
·152-171
·
IF 5
Haoyu Liu,Wenbo Luo,Ke Wang,Yanlin Wang,Hong Yuan
The bolaform surfactant C6H13-N+(CH3)2-C6H12-N+(CH3)2-C6H12-O-C6H4-C6H4-O-C6H12-N+(CH3)2-C6H12-N+(CH3)2-C6H13 (BCPH-6-6-6) was synthesized and used to guide the synthesis of hierarchical ZSM-5 nanosheets (HZN) for use as zeolite catalysts. The number of acidic sites and the Al distribution in the zeolite pores were varied by changing the amounts of sodium sulfate and Al in the initial gel. The X-ray diffraction, Fourier transform infrared spectroscopy, scanning electronic microscopy, NH3 temperature programmed desorption, 27Al magic angle spinning nuclear magnetic resonance spectroscopy and N2 adsorption/desorption were used to characterize these materials. These zeolites each had a well-developed hierarchical system and specific surface areas as high as 631 m2 g−1, indicating that the BCPH-6-6-6 formed lamellar micelles based on π–π stacking. Interconnected hierarchical pore structures were retained after the templating agent was removed. The HZN sample exhibited a 90° rotational intergrowth structure and retained a large number of lamellae. The same material had a high concentration of acidic sites and contained Al in a tetrahedral coordination framework. The catalytic cracking of oleic acid using this zeolite gave light olefin yields up to 52.2% at 500 °C, exceeding the performance of conventional ZSM-5 (38.9%), and the catalyst remained active for up to 60 h. At 450 °C, the BTX selectivity of 6.72% obtained with this material also exceeded that from the conventional ZSM-5. These results were attributed to the connected hierarchical pores of the HZN, which promoted diffusion and provided higher carbon resistance.
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FUEL
·
2025
·
IF 7.5
Xiaowei Wu,Yuqin Li,Zhengquan Yang,Mingyu Peng,Tian Gui,Xiangshu Chen,Hidetoshi Kita
A beta zeolite membrane reactor was first applied to improve conversion on the esterification of oleic acid and n-butanol at low temperature by rapidly removing the by-product water. In the pervaporation (PV)-esterification at low temperature of 353 K, the final conversion of oleic acid was significantly improved to 99.2 % in a short reaction time of 4 h. Even at an incredibly low esterification temperature of 333 K, the conversion of oleic acid reached 95.7 % in 4 h. Besides, the beta zeolite membrane reactor exhibited good hydrothermal and acid stabilities with a high oleic acid conversion (maintained above 99 %) after 5 reaction cycles. Through XRD and SEM characterization, it was found that the membrane kept complete crystal structure. Process intensification through a beta zeolite membrane reactor aided by PV was successfully used to enhance the esterification at low temperature in a short time, which was a promising coupling technology.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 12
·2693-2702
·
IF 2.8
Yandong Lu,Jiaxu Ning,Yue Zong,Fu Ding,Gaige Liu,Ruijun Zhang
BACKGROUND Tailored design of high-performance nanofiltration membranes is desirable. The physicochemical properties of the organic phaseare essential for the preparation of nanofiltration membranes. Therefore, byfine-tuning the organic phase, it is possible to achieve nanofiltrationmembranes with enhanced performance. RESULTS In this work, oleic acid, a naturally extracted fatty acid, wasintroduced into three different organic solvents (n-heptane, n-octane andisopar G) to construct special oil phases for interfacial polymerization. Testingresults showed that proper dosage of oleic acid addition can effectivelydecrease the nanofiltration membrane pore size and enhance the salt rejectionregardless of the solvent type. Taking n-octane as example, 5% oleic acidaddition in it can decrease the mean pore size from 0.500 nm to 0.341 nm and improve the MgSO 4 rejection from 52.4% to 95.5%. Further characterizationindicated that the introduction of oleic acid into organic solvent cansignificantly reduce the interfacial tension and promote the diffusion of piperazinefrom aqueous phase to the oil phase. In addition, oleic acid could react with piperazineand produce some white particles that could be embed into the polyamide layer, thus altering the surface morphology. CONCLUSION In this work, a novel modified thin film composite nanofiltration membrane was prepared by a simple and controllable oleic acid assisted interfacial polymerization strategy, which exhibits good water permeability, solute selectivity and antifouling property. Without changing the existing process, our strategy opens up a simple, environmentally friendly and operable route for the synthesis of thin film composite nanofiltration membranes. © 2024 Society of Chemical Industry (SCI).
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