Catalysis Science & Technology
·
2025
·
IF 4.2
Wenjun Zhang,Mingwei Zhang,Linlin Liu,Songzu Tang,Li Wang,Xiangwen Zhang,Guozhu Li
Preparation of robust catalysts with high isomer yield still poses challenges for efficient hydroisomerization of long-chain n-alkanes. ZSM-48 is a competitive candidate for a support due to its unique one-dimensional pore structure. However, its excessive acidic sites lead to serious cracking side reactions. Herein, a facile one-pot in situ method of trace cerium doping in ZSM-48 is developed, and the acidity property and structure of ZSM-48 are finely tuned by changing the Ce content. Compared with traditional ZSM-48, Ce-doped ZSM-48 has smaller specific surface area and microporous volume, and the concentration of strong Brønsted acid sites is effectively adjusted. Pearson correlation coefficients between the properties of ZSM-48 zeolite regulated by different amounts of Ce and the catalytic hydroisomerization performance of Pt/ZSM-48 are calculated, which demonstrate that strong Brønsted acid sites of ZSM-48 are significantly correlated with n-hexadecane isomerization yield. ZSM-48 doped with 0.41 wt% Ce with appropriate concentration of Brønsted acid sites shows superior hydroisomerization performance, reaching an iso-hexadecane yield of 87.0%.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 147
·期 19
·10707-10716
·
IF 4.755
Xue Sa,Hou Kun,Shi Yaohui,Zhang Ziwen,Fang Longhui,Liu Xiangyang,He Maogang
Dimethyl carbonate is a promising gasoline additive for improving combustion efficiency and reducing soot formation. Isobaric molar heat capacities of binary mixtures of dimethyl carbonate + n -alkanes ( C = 6,7,8) were measured over the temperature range from (314–334) K and at pressures up to 25 MPa with a flow method, while the expanded uncertainty of isobaric molar heat capacity is less than 1.0%. The accuracy of experimental system was verified by the experimental results of the isobaric molar heat capacities of pure n -hexane, n -heptane and n -octane at different temperatures and pressures. Experiment results show that dimethyl carbonate can significantly reduce the isobaric molar heat capacity, and the decrement of isobaric molar heat capacity increases as the temperature and carbon numbers in n -alkanes increases. However, pressure has no remarkable influence on the isobaric molar heat capacity. A correlation as a function of temperature, carbon numbers in n -alkanes and the mole fraction of DMC in the mixtures was established by the multiple linear regression analysis with the average absolute relative deviation of 0.25%.
研究领域:
物理化学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yubin Zhang,Zhengsong Qiu,Hanyi Zhong,Jiaxing Mu,Yongle Ma,Xin Zhao,Weian Huang
During the process of hydrate reservoir drilling, the heat generated by friction in a horizontal well section leads to hydrate decomposition and affects the wellbore stability. Consequently, the low-temperature environment of subsea wellbores can cause hydrate regeneration and flow obstacles. In this study, modified n-alkanes (MNA) with an appropriate phase transition temperature and acceptable latent heat were synthesised, and the thermal conductivity was improved by adding nano-Cu. A composite phase change material (PCM) was prepared using expanded graphite (EG) with adsorbing MNA, and nano-silica modification to improve its hydrophilicity and stability. Structural properties of the composite PCM were characterised via scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and nitrogen sorption. The DSC curves revealed an acceptable latent heat capacity and reliability of the prepared composite PCM. In addition, by simulating the temperature heating and cooling during the drilling process, the composite PCM exhibited a reasonable thermoregulating and hydrate decomposition inhibition performance, which can effectively inhibit hydrate decomposition in reservoirs and hydrate regeneration in wellbores. Moreover, the composite PCM exhibited a reasonable compatibility with the drilling fluid. The study results can be applied to realise intelligent temperature control and reduce the risk of drilling in hydrate reservoirs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Linlin Liu,Mingwei Zhang,Li Wang,Xiangwen Zhang,Guozhu Li
Bifunctional catalysts with high isomerization activity and mono-branched isomer selectivity are urgently demanded for dewaxing long-chain n -alkanes. In particular, branching location of mono-branched isomer is difficult to control by current techniques. In this study, SSZ-32 zeolite with tunable distribution depth of acid sites in micropore channels is successfully prepared by ion exchange under partial template protection. Loaded with similar Pt nanoparticles , these SSZ-32 catalysts exhibit tunable activity and selectivity for hydroisomerization of n- hexadecane . Characterization results show that the adsorption model and insertion depth of n -alkane is altered by changing the distribution depth of acid sites in SSZ-32 micropore channels. When acid sites distribute in a moderate depth (∼ 4.5 nm) of the micropore channels, high yield of center-position mono-branched isomers (46.85%) is achieved, cracking reaction is significantly inhibited. The mole ratio of 6−/7−/8-methyl isomers to 2−/3-methyl isomers was increased to at least 1.3 times of the traditional catalyst with acid sites distributed throughout the micropores. The cold flow properties of lube base oils in isomerized dewaxing of Fischer-Tropsch wax are improved significantly by achieving an optimal and effective diffusion depth of reaction intermediates in the MTT micropore channels. Efficient and selective hydroisomerization of long-chain n -alkane is realized on Pt/SSZ-32 prepared by the facile partial-detemplation method.
研究领域:
催化化学
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材料科学
·
石油炼制工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2019
·Vol. 48
·期 1
·82-103
·
IF 1.039
Jin Jing,Shao Fangjun,Dong Hong,Wu Chuan
Densities and refractive indices are investigated for four binary mixture systems of dimethylvinylethoxysilane with n -heptane, n -octane, n -nonane and n -decane at different temperatures (298.15, 303.15, 308.15, 313.15 and 318.15 K) and atmospheric pressure. From these experimental data, the excess molar volume, isobaric coefficient of thermal expansion, deviation in refractive index, molar refraction, and deviation in the molar refraction have been calculated. The computed quantities have been fitted with the Redlich–Kister equation to derive the coefficients and estimate the standard deviations. The values of the partial excess volume at infinite dilution were calculated using the coefficients of the Redlich–Kister smoothing equation. The effects of composition and temperature on these properties are discussed.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2370
·
IF 5.076
Yubin Zhang,Zhengsong Qiu,Jiaxing Mu,Yongle Ma,Xin Zhao,Hanyi Zhong,Weian Huang,Pengfei Guo
Inhibiting hydrate decomposition due to the friction heat generated by the drilling tools is one of the key factors for drilling hydrate formation. Since the existing method based on chemical inhibition technology can only delay the hydrate decomposition rate, a phase-change microcapsule was introduced in this paper to inhibit, by the intelligent control of the drilling fluid temperature, the decomposition of the formation hydrate, which was microencapsulated by modified n-alkane as the core material, and nano-silica was taken as the shell material. Scanning electron microscope (SEM), size distribution, X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FT-IR) were utilized to characterize the structural properties of microcapsules. Differential scanning calorimetry (DSC) spectra displayed that the latent heat was 136.8 J/g in the case of melting enthalpy and 136.4 J/g in the case of solidification enthalpy, with an encapsulation efficiency of 62.6%. In addition, the prepared microcapsules also showed good thermal conductivity and reliability. By comparison, it was also proved that the microcapsules had good compatibility with drilling fluid, which can effectively control the temperature of drilling fluid for the inhibition of hydrate decomposition.Keywords:microcapsule;modified n-alkane;nano-silica;hydrate formation;latent heat performance;intelligent temperature-control
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2014
·
IF 0
Qingzhao Shi,Lishuai Jing,Weihong Qiao
Poor solubility of heavy hydrocarbons in CO 2 has limited the application of CO 2 -EOR (enhanced oil recovery) in modern oil recovery industry to some extent. Therefore, it is crucial to investigate the solubility regularity of different hydrocarbons in supercritical carbon dioxide (scCO 2 ) in the first place. In this paper, our objective is to explore the solubility of n -alkanes (C 6 H 14 –C 18 H 38 ) in scCO 2 . To measure cloud point pressures, the experiment utilizes high-pressure view chamber, and results for accuracy and repeatability of the experimental method and instrument are evidently positive. Then, cloud point pressures for n -alkanes from 318 K to 343 K show a proximately linear and positive correlation with the temperature; they also increase with expanding chain length of n -alkanes. In addition, the result of x (molar fraction of n -alkane at cloud point pressure) indicates that x has a positive correlation with the pressure at identical temperature, and when pressure is constant, temperature increase will reduce x . Finally, relationship studies between density of CO 2 and x reveal that, density of CO 2 has a positive influence on the solubility of n -alkane, and the Chrastil model corrects ln ρ and ln S data. The measured data align with the Chrastil model, with a maximum AARD value of 9.85%.
研究领域:
化学工程
·
石油工程
·
热力学
✓ 已验证
产品关联
DOI
ENERGY AND BUILDINGS
·
2023
·
IF 6.7
Yangjiu Zhao,Shaowei Shen,Xinya Wang,Ruirui Cao,Xiaoyong Jia,Xiling Niu,Haihui Liu,Xingxiang Zhang
Phase change materials (PCMs) can alleviate concerns about energy to a certain extent by reversibly storing a plenty of renewable and sustainable thermal energy. However, they do not have any flexibility due to their liquid leakage and solid rigidity, making them unsuitable for further practical wearable applications. Herein, a series of SEBS/ n -alkane PCM composite films (PCMFs) were fabricated. SEBS is mainly used as the supporting substrate to prevent the leakage of liquid n -alkanes and endue the PCMFs with excellent mechanical properties. Where, the tensile strain and tensile strength of SEBS/ n -HD-50% PCMF separately are 780% and 9.96 MPa, representing excellent stretchability and deformability, tailorability, and foldability. Particularly, the onset melting and crystallization temperatures ( T mo , T co ) of SEBS/ n -ES-50% and SEBS/ n -DS-50% PCMFs individually are 28.1 °C and 28.4 °C, 33.8 °C and 35.7 °C, which match the comfort zone for human skin and the ideal thermo-response temperature range of smart windows, and a range of experiments have verified their feasibility in the fields of thermal management, smart windows and infrared stealth. This study well solves the problems of liquid leakage and solid rigidity of PCMs themselves, endows them with excellent comprehensive performance, and greatly expanding the practical applications of PCMs.
研究领域:
材料科学
·
热工程
·
复合材料
·
能量存储
·
可穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2022
·
IF 6.751
Hua Huang,Ling Wang,Xu Xiang,Fangcheng Bi,Zhaoqi Zhang
Litchi fruit is susceptible to pericarp browning after harvest, which is regulated by the oxidation of polyphenols and membrane lipids during storage. Cuticular waxes form the outermost lipid layer covering plant surfaces, and their changes in response to pericarp browning in litchi remain unclear. In this study, changes in morphological appearance and chemical composition of cuticular waxes, and expression of their associated biosynthesis regulatory genes in litchi were comprehensively investigated. In terms of pericarp microstructure, cuticular variations, such as wrinkled lines with “tooth-like” cuticular ridges, appeared on the epidermal cell surface. Following pericarp browning, the protruding nano-ridges were damaged, resulting in a disturbed appearance. Parallel to the appearance of morphological changes, we observed a 2.3-fold increase in cuticular waxes in the browned pericarp when compared with fresh fruit. Concerning chemical compositions, slight changes in the cyclic constituents were observed, whereas the synthesis of very-long-chain fatty acids , primary alcohols, aldehydes, and n -alkanes with carbon chains greater than C 26 appeared to be stimulated in the browned pericarp. Correspondingly, similar increased trends were detected in the relative gene expression levels of LcLACS1/2 , LcCER2 , LcKCR1 , LcHACD , and LcECR in fatty acid elongation, LcCER1 in n -alkanes, and LcFAR1 in primary alcohols. These results indicated that changes in surface microstructure modifications and the increase in biosynthesis of cuticular waxes, particularly the very-long-chain aliphatic components, occurred in response to the browning of litchi fruit during storage. Accordingly, surface cuticular waxes might also play an important role in regulating the browning of fruits during storage.
研究领域:
植物科学
·
食品科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2020
·
IF 3.356
Xiaomin Huang,Hanghai Zhou,Qiliang Ni,Chuhan Dai,Chunlei Chen,Yanhong Li,Chunfang Zhang
This work investigated the effects of biosurfactant at varied dose on the bioremediation of hydraulic fracturing flowback wastewater (HFFW) and explored the associated mechanism. Initially, a biosurfactant-producing strain Pseudomonas sp. CH1 was isolated from oily sludge . The glycolipid biosurfactant produced by CH1 have a critical micelle concentration (CMC) of 80 mg/L, and showed high stability over a wide range of temperature (0–120 °C), pH (4–12), and salinity (0%–16%, w/v). Addition of sub-CMC dose of biosurfactant to HFFW greatly enhanced the microbial growth and activity, upregulated the expression levels of degradation-related genes, and effectively promoted the biodegradation of n -alkanes (reduction from 272.21 to 56.93 mg/L) and PAHs (reduction from 61.6 to 16.36 μ g/L) in 7 days. The results suggested the feasibility of applying biosurfactant with sub-CMC dose to remediate HFFW and contribute significantly to the optimization of surfactant-facilitated bioremediation strategies.
研究领域:
环境工程
·
生物修复
·
微生物学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhen Lang,Yunjie Ju,Yonggui Wang,Zefang Xiao,Haigang Wang,Daxin Liang,Jian Li,Yanjun Xie
Switchable optical transparency is an intrinsic property for solid–liquid phase change materials (PCMs) during phase change processes. However, due to non-transparent porous confinement materials and core-shell structures, the synthesis of shape-stabled PCMs typically sacrifices their switchable optical transparency. Here, we present a copolymerization-induced shape-stabilization strategy that uses cellulose 10-undecenoyl ester (CUE) as a polymer-based crosslinker and a variety of alkyl acrylates (AAs) as phase change monomers to produce solid–solid phase change membranes (CUE-AAs) with high efficient thermal energy storage and excellent thermo-reversible optical transparency. These as-prepared CUE-AAs membranes present excellent switchable optical transparency from approximately below 5% to over 90% during phase change processes, and the responsive temperature of the transparency could be tailored in the range of 23–67 °C by using different AAs. Furthermore, three kinds of n-alkanes including hexadecane, octadecane, and docosane were physically entrapped in the CUE-AAs cross-linked networks to enhance the thermal energy storage performance, leading to a maximum melting enthalpy of up to 166.5 J/g. Moreover, the introduction of surface modified antimony-doped tin oxide nanoparticles significantly improved the light-to-thermal conversion effect, endowing the resulted membranes with high potential in application as thermal management material. Thus, the diverse properties of these CUE-AAs based PCMs, such as excellent thermo-reversible optical transparency, high thermal energy storage performance, remarkable photo-thermal storage efficiency, and high thermal stability, made them suitable for a wide range of applications, including intelligent optical devices and solar energy storage devices.
研究领域:
材料科学
·
能源存储
·
光学材料
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Ji-Zheng Song,Chu-Qi Wang,Guan-Shuo Yu,Zhe Sun,Ai-Hua Wu,Zhen-Ming Chi,Guang-Lei Liu
Crude oil is a hazardous pollutant that poses significant and lasting harm to human health and ecosystems. In this study, Moesziomyces aphidis XM01, a biosurfactant mannosylerythritol lipids (MELs)-producing yeast, was utilized for crude oil degradation. Unlike most microorganisms relying on cytochrome P450, XM01 employed two extracellular unspecific peroxygenases, MaUPO.1 and MaUPO.2, with preference for polycyclic aromatic hydrocarbons (PAHs) and n-alkanes respectively, thus facilitating efficient crude oil degradation. The MELs produced by XM01 exhibited a significant emulsification activity of 65.9% for crude oil and were consequently supplemented in an "exogenous MELs addition" strategy to boost crude oil degradation, resulting in an optimal degradation ratio of 72.3%. Furthermore, a new and simple "pre-MELs production" strategy was implemented, achieving a maximum degradation ratio of 95.9%. During this process, the synergistic up-regulation of MaUPO.1 , MaUPO.1 and the key MELs synthesis genes contributed to the efficient degradation of crude oil. Additionally, the phylogenetic and geographic distribution analysis of MaUPO.1 and MaUPO.1 revealed their wide occurrence among fungi in Basidiomycota and Ascomycota, with high transcription levels across global ocean, highlighting their important role in biodegradation of crude oil. In conclusion, M. aphidis XM01 emerges as a novel yeast for efficient and eco-friendly crude oil degradation.
研究领域:
环境科学
·
微生物学
·
生物技术
·
生物化学
✓ 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）