FUEL
·
2021
·
IF 6.609
Jinlei Chen,Dechao Wang,Fenqiang Luo,Xinyu Yang,Xingyong Li,Shuirong Li,Yueyuan Ye,Duo Wang,Zhifeng Zheng
Production of valuable chemicals and fuels from waste animal fat and vegetable oils can serve as alternatives to fossil energy. In this study, the selective production of alkanes and higher fatty alcohol via hydrodeoxygenation (HDO) of palmitic acid over red mud-supported nickel catalysts (Ni/RM) was reported. Meanwhile, the study has investigated the effect of Ni loading, reaction temperature, hydrogen pressure on the HDO of palmitic acid, analyzed the reusability of Ni/RM and explored the possible reaction mechanism. The results show that palmitic acid is completely converted over 7%Ni/RM. The selectivity of fatty alcohol and alkanes are 92.54% (260 °C) and 100% (300 °C), respectively. Ni/RM has shown the highest catalytic performance as compared to commercial Ni/SiO 2 and Ni/γ-Al 2 O 3 catalysts. The 7%Ni/RM also demonstrates stable catalytic performance after multiple times of reuse. Moreover, hexadecanol plays an important role in hydrodeoxygenation, decarbonylation, and decarboxylation routes.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2021
·
IF 4.524
Q. Zhang,H. Yan,Z. Zhang,J. Luo,N. Yin,Z. Tan,Q. Shi
Fatty alcohols (FAs) have been widely studied as typical phase-change materials for their high latent heat, low undercooling, non-toxicity, and low cost in thermal energy storage applications. The thermal properties, especially the heat capacity, play a vital role in designing-related energy storage techniques. However, there are few studies on the thermal properties of FAs systematically investigated in a wide temperature region, which greatly limit their application in thermal energy storage field. In this study, the thermal properties of even-numbered FAs (C 12 H 25 OH-C 18 H 37 OH), such as thermal stability, thermal conductivity , phase transition temperature, and enthalpy have been systematically investigated using a combination of various thermal analysis and calorimetry methods. The corresponding thermodynamic functions such as the standard molar heat capacity , entropy, and enthalpy at 273.15 K and 0.1 MPa have been calculated based on the heat capacity curve fitting. Most importantly, the heat capacities of 1-tetradecanol and 1-hexadecanol are reported for the first time in the wide temperature range of 1.9–370 K. Furthermore, by fitting the heat capacities of FAs, a function of molar heat capacities ( C p ) related to the number of carbon atoms ( n ) and temperature ( T ) has been established, which can express the heat capacity of FAs between C 12 H 25 OH and C 22 H 45 OH reasonably in the temperature region of 50–240 K. This work provides accurate and systematic thermodynamic data of FA samples for the future study on their thermodynamic property and related processing design of thermal energy storage application.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaonan Xu,Nana Luo,Wan-Hui Wang,Ming Bao,Jiasheng Wang
Fatty acid hydrogenation is an important method for the production of fatty alcohols. The combination of Ni and Mo has been reported to be an effective and low-cost catalyst. However, the effect of Mo doping has yet to be fully understood. Here Ni-MoOx/TiO2 catalysts were prepared via simple impregnation. and the enhancement effects of Mo doping were comprehensively revealed. First, MoOx can attract electrons from Ni, reduce the electron density of Ni to improve the intrinsic activity of Ni, and form a Niδ+-(MoOx)δ− heterojunction to induce H2 heterolytic cleavage to active hydrogen ions. Second, the reduction of MoOx generates oxygen vacancies, which can absorb C═O of the fatty acid and facilitate the reaction progression. Third, a Ni1–xMox solid solution can be formed, which can increase the hydrogen adsorption quantity and accelerate the reaction rate. Finally, the bond strength of Mo–O is found to be the most optimum that can absorb the fatty acids while releasing the alcohols so as to recover the oxygen vacancies and avoid overhydrogenation. Therefore, high activity and selectivity for the hydrogenation of carboxylic acid substrates to alcohols can be obtained. Under significantly milder conditions (155 °C, 3 MPa H2) the catalyst provided a 98% yield of lauryl alcohol from lauric acid hydrogenation with a low activation energy of 40.1 kJ/mol. This work could provide an insightful understanding about the effects of Mo doping to Ni on catalyzing hydrogenation reactions.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yu Su,Rong Fan,Jiabao Li,Yangxi Liu,Ziyuan Zheng,Xin Zhou,Xiang Feng,Yibin Liu,Hui Zhao,Xiaobo Chen,Xingong Zhang,Chaohe Yang,Hao Yan
Oxidation of fatty alcohols to fatty acids is still challenging due to the sluggish activation of the C–H bond over Au supported on reducible oxides with a coordination-saturated structure. Herein, we constructed an efficient interfacial Auδ−–OV–Ti structure by tuning the crystal forms of TiO2. Compared with TiO2-rutile exposed by (110) and (111) crystal facets, TiO2-anatase can exploit the defect (101) crystal facet to obtain rich oxygen vacancies (OV), inducing electron migration from TiO2-anatase support to Au species to form electron-rich Auδ− species. Specifically, the synergistic catalytic effect between the OV–Ti and Auδ− species greatly enhances the adsorption of alcohol and thereby overcomes sluggish activation of the C–H bond caused by the electron pushing effect triggered by long carbon chains. Consequently, the Au/TiO2-anatase catalyst shows excellent isooctyl alcohol conversion (69.5%) and isocaprylic acid selectivity (67.9%) under base-free conditions. The catalytic system is further extended to the oxidation of other fatty alcohols to fatty acids with excellent catalytic performance.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Xinli Tong,Linhao Yu,Xuan Luo,Xuli Zhuang,Shengyun Liao,Song Xue
The efficient transformation of furfural (FUR) with aliphatic alcohols to achieve the carbon-chain growth has been developed using a binary Cu-Ce oxide as the catalyst. In the presence of molecular oxygen, the tandem oxidative condensation of FUR with n -propanol is successfully performed, in which an 85.4% conversion of FUR in 95.3% selectivity of 3-(furan-2-yl-)-2-methylacryaldehyde was obtained. The effects of different Cu/Ce ratios and base additives were investigated in detail. As a result, it is found that the CuO-CeO 2 (1: 9) catalyst is optimal and potassium carbonate is a suitable additive. Next, the recycling of CuO-CeO 2 catalyst was tested and there is no obvious activity loss after being reused five times. Moreover, the oxidative condensation of FUR with various aliphatic alcohols including ethanol, isopropanol, n -butanol and n -hexanol was studied where the long chain alcoholic molecule hinders the proceeding of reaction. Finally, based on the experimental results and reaction phenomena, a possible mechanism for the oxidative condensation of FUR with n -propanol-O 2 is proposed.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Yongzhao Zhang,Xia Guo,Jianbing Ji
(2R,3S,4S,5S)-6-(Hydroxymethyl)-tetrahydro-2H-pyran-2,3,4,5-tetraol (d-glucose) solubility in 1-dodecanol, 1-decanol, and 1-octanol from 343.15 K to 393.15 K was determined, respectively. The solubility of d-glucose increased with an increase in temperature and decreased with the increase of fatty alcohol chain length. The modified UNIQUAC model, S-UNIFAC model, and mS-UNIFAC model were applied to predict the solubility data; the interaction parameters were determined. Of the three models, the modified UNIQUAC model showed better prediction accuracy.
研究领域:
化学工程
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 115
·114572-114579
·
IF 3.289
Youhong Ai,Mian Wu,Liu Yang,Faqiong Zhao,Baizhao Zeng
A polyaniline (PANI)-ionic liquid (IL) based solid phase microextraction (SPME) coating is presented. The porous PANI was electrodeposited on a stainless steel wire, and then it was coated with IL. The porous PANI could well immobilize IL, and the obtained hybrid coating could be used for more than 110-times of adsorption/desorption. The extraction efficiency of different ILs (i.e. 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-octyl-3-methylimidazolium hexafluorophosphate and 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HOEMim]NTf2)) based coatings was compared for different analytes (i.e. benzene, aryl halide, phenolic, amine and fatty alcohol compounds). It was found that the PANI-[HOEMim]NTf2 coating exhibited quite high extraction efficiency for fatty alcohol compounds (i.e. 1-octanol, 1-nonanol, n-decanol, 1-undecanol and dodecanol). The dependence of the gas chromatograph peak areas of the analytes after SPME on their initial concentration in solution was investigated and the corresponding isothermal adsorption equation was displayed. After optimizing the conditions, linear detection ranges of 0.05 ng mL−1 to 100 ng mL−1 were obtained for different fatty alcohol compounds. The limits of detection were 0.0061–0.018 ng mL−1. The relative standard deviations (RSD) of the peak area were below 8.4% for five repetitive extractions of solutions containing 25 ng mL−1 fatty alcohol compounds. The proposed method was applied to the determination of the analytes in two tea drinks, and 57 ng mL−1 of 1-nonanol was found in a jasmine tea sample, while 2.2 ng mL−1 of 1-undecanol was found in a rock sugar lemon sample, but other analytes were below their detection limits. The recoveries for spiked fatty alcohols were 84.9–117.6%, and the RSDs were lower than 12.2%.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2013
·Vol. 15
·期 8
·2215-2221
·
IF 6.828
Tianliang Lu,Zhongtian Du,Junxia Liu,Hong Ma,Jie Xu
Catalytic oxidation of non-activated aliphatic alcohols with molecular oxygen is rather challenging, especially in an aqueous medium in the absence of an additional base. Bismuth is usually used as a promoter of platinum-based catalysts. In this work, bismuth oxide was explored as a support, and Pt0 nanoparticles supported on bismuth oxide (Pt/Bi2O3) exhibited high activity for aerobic oxidation of n-butanol using water as a solvent in the absence of an additional base under optimized conditions. Besides n-butanol, liquid primary aliphatic alcohols with low solubility in water could also be smoothly oxidized into the corresponding carbonyl compounds with molecular oxygen. Pt/Bi2O3 reduced by H2 at about 200 °C showed the highest activity for aerobic oxidation of n-butanol. At this temperature, platinum oxide was reduced to Pt0 and bismuth oxide could be reduced partially which might change the surface property of bismuth oxide.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yuhan Cui,Songyin Yu,Zhichao Sun,Hongyu Niu,Changhai Liang,Chuang Li
Selective hydrogenation of fatty esters to high-value fatty alcohols is highly desirable for the utilization of natural oils. However, the hydration reaction of the support and hydrolysis reaction of the C–O bond can affect the selectivity of the targeted alcohol. Herein, core–shell Al2O3@Cu2Zn1-LDO is prepared via the in situ growth of CuZnAl-LDHs on Al2O3 microsphere substrates, followed by a calcination–reduction process. The catalyst achieves a methyl laurate (ML) conversion of 95% and selectivity of 98% for lauryl alcohol (LA) under mild conditions (4 MPa of H2 and 240 °C). In addition, the three-dimensional (3D) hierarchical structure of the Al2O3@Cu2Zn1-LDO catalyst enhances mass diffusion and transport, significantly improving catalytic performance and exhibiting excellent stability in the hydrogenation of fatty esters to fatty alcohols. The hydration reaction between Al2O3 and H2O produced during the hydrogenation of fatty acid esters is prevented successfully. Therefore, this work provides a new approach for designing newly structured Cu-based catalysts for the highly selective synthesis of fatty alcohols from natural oils.
研究领域:
催化化学
·
材料科学
·
能源化工
✓ 已验证
DOI
高影响因子
ChemPlusChem
·
2017
·Vol. 82
·期 6
·879-887
·
IF 2.797
Tingting Xiao,Xiaoyang Zhang,Jingyu Wu,Jiazhi Yang,Yong Yang
Graphical Gel sensors : An opaque-to-transparent transformation of a bis-dipeptide-based supramolecular gel occurs upon use of aliphatic alcohols as a component of organic/H 2 O binary mixed solvents for gelation. A reassembly process with microstructure evolution from agglomerates to nanofibers is observed during the gel-to-gel phase transition (see figure). Moreover, the solubility theory with the Flory–Huggins parameter is used for the successful prediction of gelling performance, which could improve system screening for practical applications. A bis-dipeptide supramolecular gelator (DMPV) is prepared, based on l -valine moieties having a pyridinyl group and a long fatty diamine. It is found that the gelator can immobilize organic/water binary mixed solvents, and gel-to-gel transitions with unprecedented opaque-to-transparent transformations are observed upon using aliphatic alcohols such as methanol, ethanol, 1-propyl alcohol, and isopropanol as the organic components. Morphological investigations indicate that a reassembly process occurs, and microstructure evolutions from agglomerates to nanofibers are observed. Opaque and transparent assemblies can interconvert, and respond and restore under mechanical force and pH stimuli. Moreover, Hansen and Flory–Huggins parameters are used to investigate the effect of the solvent on the gelation performance of DMPV. This may facilitate the structure and solvent optimizations and aid the development of advanced gel systems.
研究领域:
超分子化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Iranian Chemical Society
·
2016
·Vol. 14
·期 1
·111-119
·
IF 1.3
Yang Xiaomei,Fu Xiaomin,Bu Ningning,Han Li,Wang Jianfeng,Song Chengying,Su Yunlai,Zhou Lipeng,Lu Tianliang
Cu–Ni/γ-Al 2 O 3 bimetallic catalysts were developed for anaerobic dehydrogenation of non-activated primary aliphatic alcohols to aldehydes. Systematic investigation about the promotion effect of nickel on the catalytic performance was carried out. Hydrogenation of C=C bond rather than C=O bond, was significantly improved over Cu–Ni/γ-Al 2 O 3 catalyst by introducing nickel, which interprets the good conversion of primary aliphatic alcohols. This work would contribute to design new catalysts for dehydrogenation of primary aliphatic alcohols.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Haoran Zhou,Luan Wen,Liwu Lin,Zhongrong Li,Minghua Qiu
Pyrethrins is one of the most important botanical insecticides. In recent years, due to the demand for pyrethrins, factories use dried flowers of cultivated pyrethrum as raw materials to produce pyrethrin. During this process, a large amount of wax is produced. In order to avoid resource waste and environmental pollution, better development and utilization of pyrethrum wax is required. Therefore, in this study, refined pyrethrum wax unsaponifiables (RPWU) were prepared from pyrethrum wax wastes by silica gel column chromatography and saponification . The compositions and contents of main components in the RPWU were studied by GC and GC-MS. RPWU contained rich long-chain fatty alcohols , in which eicosanol, docosanol , tetracosanol and hexacosanol were the main components, accounting for 71.3%. In addition, it contained a small amount of odd carbon long-chain fatty alcohols (tricosanol and pentacosanol), accounting for 7.5%, which is very rare in plants. Meanwhile, RPWU showed inhibitory effect on tyrosinase , suggesting that RPWU could have skin-whitening effect. Therefore, RPWU obtained from pyrethrum wax waste has potential bioavailability value, which will promote the development and utilization of pyrethrum wax waste.
研究领域:
植物学
·
化妆品科学
·
环境科学
✓ 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）