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.
研究领域:
催化化学
·
可再生燃料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Functional Foods
·
2024
·
IF 3.8
Qian Lei,Yaoyu Zhang,Tongtong Yang,Lei Chen,Xinxin Pei,Yujie Zhang,Tengfei Ma,Yuzhu Xie,Yi Wang,Hongxia Li,Cheng Cao,Buchang Zhang,Changzhi Xu
Listeria monocytogenes infection often leads to listeriosis in immunocompromised individuals, and screening for potential nutrients that improve immunity may be beneficial. Here, we found that pre-incubation with heptadecanoic acid (C17:0), an odd-chain saturated fatty acid, significantly inhibited L.monocytogenes replication in differentiated THP-1 and RAW264.7, as evidenced by comparison of listeriolysin expression and colony count. Mechanistically, the administration of C17:0 triggered the activation of the IFN and NF-κB signaling pathways. Furthermore, C17:0 upregulated ACOD1 expression and the generation of itaconate, an anti-bacterial metabolite in macrophages. Based on these results, our comparative analysis showed that sheep tail fat (STF), ruminant lipid rich in C17:0, had similar anti- L.monocytogenes effect. Collectively, our data highlighted the function of C17:0 in boosting the immune response, shedding light on the application of C17:0 and STF as potential candidates for strengthening anti- L.monocytogenes response.
研究领域:
免疫学
·
微生物学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 17
·5729-5738
·
IF 2.371
Sun Shao-Xing,Xie Rui,Wang Xiao-Xue,Wen Guo-Qing,Liu Zhuang,Wang Wei,Ju Xiao-Jie,Chu Liang-Yin
Compared to phase-change fibers with hydrophilic polymer shell, those with hydrophobic polymer are more stable in water and moist environments. However, their fabrication processes are involved in some toxic organic solvents. Here, the nanofibers with phase-change material (PCM, i.e., octadecane) as core and hydrophobic shell (i.e., polyvinyl butyral) are fabricated via coaxial electrospinning using environmental friendly ethanol as solvent. Effects of the polyvinyl butyral concentration in ethanol solution as well as the flow rates of core and shell fluids on the morphology of octadecane/polyvinyl butyral (PCM/PVB) nanofibers are systematically investigated. The thermo-regulating capability of PCM/PVB nanofibers is demonstrated by observing the surface and inner temperatures of model houses covered with fibers. The higher the PVB concentration and the shell flow rate are, the better the morphology of core/shell PCM/PVB nanofibers becomes, leading to higher encapsulation efficiency. At a constant shell flow rate, the encapsulation ratio of PCM/PVB nanofibers increases with the core flow rate. The encapsulation ratio of the PCM/PVB nanofibers, which fabricated with PVB concentration of 20 % (w/v) and at the core flow rate of 0.60 ml h −1 and the shell flow rate of 3.0 ml h −1 , respectively, reaches to the maximum of 46.4 %. The corresponding melting enthalpy (Δ H
m ) and the crystallization enthalpy (Δ H
c ) of these PCM/PVB nanofibers are 105.9 and 106.5 J g −1 , respectively. The PCM/PVB nanofibers exhibit good thermo-regulating capability under the simulated solar irradiation, regulating the temperature at around 28 °C. The resultant PCM/PVB nanofibers exhibit satisfactory stability and repeatability in the thermo-regulating capability during repeated heating/cooling cycles. The results provide valuable guidance for environmental friendly preparation of phase-change nanofibers with satisfactory and stable thermal characteristics.
研究领域:
材料科学
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高分子化学
·
纳米技术
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热功能材料
·
环境友好材料
·
能源存储
·
纺织工程
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2024
·
IF 3.8
Xinyan Jin,Decai Meng,Lili Fu,Yang Zhao,Qi Zhang,Zhan Zhang,Xianzhong Yin,Qinpeng Shen,Shuang Wang,Yue Zhang,Le Wang,Ping Lei,Bin Li
Understanding the puff-by-puff delivery mechanisms of key components of heated tobacco products is critical to developing product designs. This study investigates the puff-by-puff release patterns of key components in Natural Smoke Cigarettes (NSCs), which are designed to deliver nicotine without combustion by reducing oxygen content, utilizing a 30-s puff interval, a 2-s puff duration, and a 55 mL puff volume to simulate realistic smoking conditions. By establishing models to analyze the variation of nicotine, glycerol, 1,2-propylene glycol (PG), and water in different functional sections of the cigarette under controlled smoking conditions. These sections include the tobacco, hollow, cooling, and filter sections, constituting the structure of NSCs. In addition, the model calculates the port-by-port release of the components in the flue gas aerosol and compares it with the measured value. The results showed that: The retention amount in the tobacco section showed a steep decline in the first three puffs, with an overall exponential decrease. The amounts in the other sections were consistent, increasing in the first two puffs and then stabilizing. The retention amount decreased linearly with each puff, with a similar pattern across sections. The release amount peaked at the fourth to fifth puffs and then stabilized. The retention amount in the tobacco section declined exponentially in the first three puffs. It peaked in the second to third puffs in other sections, then decreased with each subsequent puff. The retention amount in the tobacco section showed a significant decline in the first puff, stabilizing at around 4 mg. In other sections, it peaked at the first puff and then rapidly declined. These findings can inform the development of reduced-harm smoking products and contribute to a better understanding of the dynamics of smoke generation. Additionally, the study offers a reference for the puff-by-puff release stability of NSCs and the improvement of consumers’ sensory quality.
研究领域:
生物学
·
医学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Huimin Yan,Fan Yang,Nan Yin,Yan Kou,Quan Shi
Adiabatic calorimetry is a reliable method for determining the purity of organic compounds, offering significant advantages over chromatography by eliminating the need for impurity separation. Despite its longstanding application, research in this area has been limited. This study comprehensively assessed the purity of tetradecanoic acid, n-heptadecane, and phenol using adiabatic calorimetry, comparing the results with those obtained through chromatography. The results demonstrated that tetradecanoic acid purity can be accurately measured, while n-heptadecane exhibited satisfactory repeatability in purity determination without sample separation in polycrystalline forms. Furthermore, the purity of phenol was effectively assessed using adiabatic calorimetry, where chromatography faced challenges. Overall, this study validates adiabatic calorimetry as a robust technique for organic compound purity determination and suggests avenues for further research in this domain.
研究领域:
化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Bin Chen,Xingwen Cha,Xuexue Dong,Juanjuan Bian,Jiale Huang,Qingbiao Li,Xiaoqing Huang,Guowu Zhan
Upgrading biomass-derived fatty acids through the H 2 -free and solvent-free catalytic deoxygenation process is both safe and eco-friendly. Herein, we used modified rice husk-derived biochar with ultra-high specific surface area and abundant surface groups as a support to design a homologous bimetallic site catalyst containing Ni single atoms (Ni 1 ) and Ni nanoclusters (Ni n ), the synergy between which is dedicated to excellent catalytic performance. The designed catalyst, Ni 1+n /A-bio-AC, demonstrated an impressive 89.8% selectivity for odd-numbered long-chain alkanes during the H 2 -free and solvent-free deoxygenation of stearic acid, with a turnover frequency value over 18 times higher than conventional Ni/AC. Multiple characterizations revealed the coexistence of Ni 1 and Ni n on the catalyst support. Experimental and theoretical calculations showed that Ni n facilitates the adsorption of fatty acid substrates. While Ni 1 serves as highly dispersed Lewis acid sites, enhancing the dehydrogenation of fatty alcohol intermediates during the in situ hydrodeoxygenation and lowering the decarboxylation pathway energy barriers via electronic synergy with Ni n , thus remarkably boosting the catalytic deoxygenation activity. This work provides a novel Ni dual-site catalyst for developing biomass resource conversion technologies.
研究领域:
催化化学
·
生物质能
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 12
·808
·
IF 5
Feng Li,Ruoxi Yang,Jian Xu,Guohai Xu,Ye Wu
The concentration of small molecules reflects the normality of physiological processes in the human body, making the development of simple and efficient detection equipment essential. In this work, inspired by a facile strategy in point-of-care detection, two devices were fabricated to detect small molecules via photocurrent measurement. A linear response of the photocurrent against the concentration of the small molecules was found. In the first device, metal ions were introduced into gel substrates made by xanthan gum to enhance photocurrent response. N-phenyl-2-naphthylamine was measured when iron or manganese ions were used. L-Phenylalanine was measured when the gel was modified by samarium, iron, cerium, or ytterbium ions. L-(+)-Arabinose was detected via the gels modified by iron or holmium ions. D-(+)-Mannose was detected when the gel was modified by ytterbium, manganese, chromium, or sodium ions. L-Methionine was detected in the gels modified by samarium, zinc, or chromium ions. The second device was based on a paper sheet. A sugar-like molecule was first synthesized, which was then used to modify the paper. The detection was possible since the photocurrent showed a linear trend against the concentration of D-Trehalose. A linear fit was conducted to derive the sensitivity, whose value was found to be 5542.4. This work offers a novel, simple, and environmentally sustainable platform that is potentially useful in remote areas lacking medical devices.
研究领域:
生物医学工程
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Kok Bing Tan,Yueming Qiu,Yuze Li,Bin Chen,Lingxing Xia,Dongren Cai,Sajid Ali,Jiale Huang,Guowu Zhan
Although FeNi bimetal-based materials have been used for the deoxygenation of different substrates, no applicable and green support has been reported to load FeNi alloy for the deoxygenation of stearic acid. Furthermore, the activation energy of stearic acid deoxygenation on a FeNi-based catalyst is uncharted and the reaction mechanism remains ambiguous. Herein, we integrate FeNi bimetals on activated carbon (AC) as an efficient green catalyst for the deoxygenation of stearic acid into biofuels. The catalytic performance was systematically investigated with respect to Fe/Ni molar ratios and calcination temperatures. FeNi bimetals supported on AC (FeNi/AC-500) exhibited higher catalytic activity than their monometallic counterparts, indicating the importance of synergistic effect and interaction between Fe and Ni for the deoxygenation of stearic acid. Especially, Fe 1 Ni 3 /AC-900 calcined at 900 °C demonstrated the highest stearic acid conversion and linear C 17 hydrocarbon ( viz. , heptadecane and 1-heptadecene) selectivity of 99 % and 94 %, respectively, due to the optimal formation of ordered Fe 1 Ni 3 alloy phases and the lowest apparent activation energy of stearic acid pyrolysis. The distinguished performance surpassed that of noble metal and toxic catalysts in literature works. Therefore, a low-cost, green yet effective FeNi-based catalyst with low activation energy has been developed for the deoxygenation of stearic acid into biofuels.
研究领域:
催化化学
·
能源科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Xuwen Zhang,Xuexue Dong,Youting Wang,Juanjuan Bian,Sajid Ali,Dongren Cai,Kang Sun,Xiaoping Rao,Jianchun Jiang,Guowu Zhan
The conversion of stearic acid into linear hydrocarbons is a crucial step in advancing sustainable biofuels and biochemicals. Herein, we developed a series of cobalt-based catalysts (referred to as Co/C@TSC) using metal–organic frameworks (MOFs) as precursors and supporting them on biochar derived from natural tung shells (TSC). Tung shells, a byproduct of the tung oil extraction process, are widely available. The as-designed Co/C@TSC catalyst effectively deoxygenated stearic acid via decarbonylation/decarboxylation (DCOx) processes, achieving a conversion of 78.5% and hydrocarbon product selectivity of 90%, specifically heptadecane and heptadecene. Our detailed analysis showed that the addition of biochar support improved the spatial distribution of cobalt species (with a high surface concentration of Co0) and enhanced the adsorption of reactants, thus boosting catalytic activity. Additionally, in situ DRIFTS analysis confirmed that the stearic acid deoxygenation process involved the intermolecular dehydration of stearic acid molecules. Experiments with different reaction substrates revealed that the stearic anhydride was a key reaction intermediate during the deoxygenation process. This study introduces a novel catalyst made from dual carbon-supported nonprecious metals, presenting a promising method for transforming stearic acid into valuable hydrocarbon products.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Hongju Lin,Fanhui Liao,Yanchang Chu,Yuanyuan Wang,Donghai Xu,Kai Cui,Le Yang
A mesoporous, multi-shell, spongy nanosphere NiCo metal/metal oxide hybrid was synthesized using glucose reduction method, and the metal/metal oxide ratio can be regulated by adjusting the amount of glucose. The NiCo metal/metal oxide hybrid outperformed NiCo metal catalyst on decarboxylation reaction, and achieved a 100 % conversion of stearic acid and a 98 % yield of heptadecane under 1 MPa H 2 at 280 °C for 3 h. Despite of that metal active sites are well recognized responsible for decarboxylation, the better performance of hybrid was attributed to the co-existence of metal oxide and carbon that played an important role in separating metal particles and preventing them from aggregation, and thus exposed more active metal sites. Moreover, electron transfer from metal oxide to metal has been detected, which facilitated the adsorption of the carboxyl carbocation on metal sites and the concomitant efficient decarboxylation. The catalyst also performed efficiently on the catalytic upgrading of sludge bio-crude.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhengting Xiao,Dongcai Shen,Kai Guo,Guangci Li,Wentai Wang,Xuebing Li,Song Chen,Chunhu Li
Cu-based catalysts were synthesized utilizing the ZnAl 2 O 4 spinel as supports for the selective hydrogenation of methyl stearate to stearyl alcohol. The presence of Zn atoms inhibited the agglomeration of the particles of Cu species in the reduction process, promoting the distribution of Cu species on the catalyst surface, which will enhance hydrogen activation and selective hydrogenation activity. DFT calculations show that the bond energies of the C-O bonds on both sides of the ester group decrease with the adsorption of the ester molecule onto Cu + species, and the C-O bond energy on the methyl side is lower than that on the carbonyl side. However, because the carbonyl carbon is more susceptible to nucleophilic attack, the C-O bond on the carbonyl side is more easily broken. In addition, the oxygen vacancies of the supports promote hydrogen spillover and the adsorption and activation of ester groups, which further enhance the selective hydrogenation activity of the catalyst on methyl stearate.
研究领域:
催化化学
·
材料科学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ruiping Wei,Mingzhu Yao,Ziqi Wang,Huijun Liu,Rongying Xia,Lei Yang,Guanghui Ma,Lijing Gao,Xiaomei Pan,Guomin Xiao
The properties of support have significant effects on the catalytic performance of supported catalysts. The present study involves the synthesis of a series of Mo-modified NbOPO4 supports, which were subsequently utilized for the preparation of supported NiCu bimetallic catalysts via a hydrothermal method. All catalysts were evaluated in the HDO of oleic acid to long-chain alkanes without carbon loss, an essential procedure for contemporary industrial applications. The effects of acidity and porosity on the dispersity and valence states of the metal components were systematically investigated via BET, XRD, SEM, XPS, NH3-TPD, and H2-TPR. Catalytic performance of the materials for HDO of oleic acid was assessed and it revealed that NiCu supported on Mo-modified NbOPO4 exhibited significantly enhanced selectivity for C18 compared to those supported on NbOPO4 (53.10% VS 84.16%) under the mild reaction condition of 250 °C reaction temperature, 3 MPa initial H2 pressure and 7 h reaction time. The resluts demonstrated the significant potential of Mo-modified NbOPO4 as a support for NiCu bimetallic catalysts, enabling efficient conversion of oleic acid into C18 and highlighted the crucial role of support modification in enhancing catalytic performance.
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
危险品化学品经营许可证（带存储）