FUEL
·
2019
·
IF 5.128
Yiming Zhang,Xiefei Zhu,Liqiang Zhang,Xifeng Zhu
In this study, a bio-oil model compound of walnut shell pyrolysis oil was selected. The microemulsions of diesel and model compound were produced using Span80 and Tween 80 as surfactants. The microemulsions were quantificationally analyzed to investigate the solubilization capacity of bio-oil characteristic components in diesel. The effects of surfactant concentration and initial volume ratio of bio-oil model compound to diesel (B/D ratio) on the solubilization capacity of bio-oil characteristic components in diesel were investigated. The heating value, kinematic viscosity, elemental analysis and thermogravimetric analysis of microemulsion were also conducted. Experimental results indicated that the suitable concentration of surfactant was 0.3 mol/L–0.45 mol/L, and the optimum B/D ratio was 4:12 for the bio-oil model compound. The dissolubility of m-cresol and guaiacol in microemulsion was much better than that of water and acetic acid. The heating value and the kinematic viscosity of microemulsion decreased slightly as the B/D ratio increased. Increasing the surfactant concentration contributed to a more pronounced increase in the kinetic viscosity and a significant decrease in the heating value. The influence of surfactant concentration on the fuel properties and thermogravimetric characteristics was stronger than that of B/D ratio.
研究领域:
能源科学
·
化学工程
·
生物质能
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Wenyan Mu,Tao Wang,Qu Zhang,Xianze Wang,Haozhao He,Dongling Wu
To achieve efficient upgrading and clean utilization of lignite-derived tar, an integrated zeolite modification strategy based on deep eutectic solvents (DESs) was developed, in which a Fe-based DES system was constructed with FeCl 3 ·6 H 2 O and CF 3 COOH. This DES realized the simultaneous acid modification and metal incorporation of ultrastable Y (USY) zeolite, thereby simplifying the catalyst preparation process. Characterization results revealed that DES treatment at an optimal molar ratio of 1:9 preserved the structural integrity of the Faujasite framework while inducing a hierarchical “micropore-sacrifice/mesopore-compensation” architecture. Meanwhile, Fe species were introduced uniformly, leading to the reduction of Brønsted acid sites and the enhancement of Lewis acid sites, thereby constructing multifunctional catalytic centers with synergistic acidity and redox activity. Mechanistic analysis demonstrated that DES-induced mesoporosity enhanced mass transfer and diffusion, while the cooperation between Fe redox sites and Lewis acid sites facilitated C-C and C-O bond cleavage as well as aromatization reactions. In the fixed-bed pyrolysis of NMH lignite, the optimized catalyst exhibited superior catalytic performance: the light oil fraction in tar increased from 16.86 % to 27.94 %, the relative content of light tar reached 75.61 %, gas yield reached 21.53 %, and PAHs content dropped sharply. Furthermore, the catalyst was confirmed to possess superior reusability in successive runs. This study highlights DES as tunable functional media, serving as an efficient platform for the integrated regulation of zeolite structure, acidity, and activity. Consequently, it provides a novel strategy for fabricating high-performance modified molecular sieve catalysts, which are applicable to the clean and value-added conversion of coal pyrolysis tar.
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Thanh-Binh Nguyen,Quoc-Hoang Do,Chiu-Wen Chen,Wei-Hsin Chen,Xuan-Thanh Bui,Cheng-Di Dong
Background This study investigates the synthesis of biochar from cow manure at various pyrolysis temperatures and its effectiveness in dye adsorption, focusing on how temperature influences the adsorption capacities of biochar towards MB and MO. Methods Biochar was produced at four pyrolysis temperatures (300, 500, 700, and 900 °C), labeled CMBC-x. Adsorption capacities for MB and MO were tested. Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) identified functional groups involved in dye adsorption. Findings Biochar produced at 900 °C (CMBC900) showed the highest adsorption capacities: 200 mg g -1 for MB and 147 mg g -1 for MO. For a dye mixture, CMBC900 adsorbed 104.5 mg g -1 of MB and 98.7 mg g -1 of MO, indicating efficient separation. CMBC900 maintained high efficiency after ten cycles, with 97.5 % for MB and 90.5 % for MO. These findings highlight the robustness and long-term potential of CMBC900 as an adsorbent. Converting agricultural waste into biochar offers an economically viable solution for waste management and environmental protection by removing harmful dyes from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 16
·6792-6806
·
IF 3.5
Li Junguo,Yang Xuebin,Li Peibo,Zhang Yang,Luo Guoqiang,Shen Qiang,Sun Yi
Owing to inadequate interface contact between carbon and aluminum, enhancing the Al/C interface is crucial for the fabrication of high-performance Al matrix composites. This study selected polyvinyl butyral (PVB) with excellent dispersion properties as the carbon source, simultaneously introducing silver to achieve synergistic reinforcement between silver and carbon in Al matrix composites, offering a novel reinforcement approach for Al matrix composites. The Al–16Ag–C composite is fabricated through the in situ pyrolysis of PVB followed by hot-pressing sintering. Subsequently, the effect of temperature on the microstructural evolution and mechanical properties of the composite is investigated. Microstructural characterization demonstrates the formation of two alloy phases, namely Ag 2 Al and Al 4 C 3 , within the Al–16Ag–C composite. The alloy phases, distributed at the grain boundaries, enhance the material’s strength by impeding dislocation motion, increasing dislocation density within the matrix, and limiting grain growth. The Al–16Ag–C composite, sintered at 630 °C, exhibits a remarkable ultimate tensile strength of 481 MPa and an elongation of 16.84%, representing a significant enhancement compared to pure Al.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
WASTE MANAGEMENT
·
2021
·
IF 7.145
Xiefei Zhu,Zejun Luo,Xifeng Zhu
Enriching high-value chemicals from the pyrolysis of agricultural and forestry waste is an efficient way to achieve sustainable development and large-scale application of biomass pyrolysis. Phenols, as important chemical raw materials, spices and food additives, have attracted widespread attention. Herein, a novel technical route of torrefaction pretreatment combined with fractional condensation in pyrolysis loop was proposed to enrich the phenols in liquid products. In this study, the enrichment of phenols from the pyrolysis loop of walnut shell under the combination of torrefaction and fractional condensation was explored using a fixed-bed pyrolysis reactor equipped with a three-stage condensation system. Simultaneously, the effects of torrefaction on feedstocks were investigated through a thermogravimetric analyzer based on the characteristics of feedstocks. The results showed that the torrefaction and pyrolysis loop had a negative impact on the pyrolysis efficiency and the yield of liquid products, while the change in the condensation efficiency depended on the combined effects of torrefaction and pyrolysis loop. In addition, phenols tended to be enriched in the second condensation stage, especially phenol, o-cresol, 4-ethylphenol. Importantly, torrefaction could significantly enrich phenols in the liquid products, and the enrichment of phenols is relatively increased by 109.44% at least. Moreover, the pyrolysis loop was also beneficial to the enrichment of phenols, which was at least 90% higher than that of walnut shell. This study provided a potential route to enrich high value-added products from the pyrolysis loop of lignocellulosic biomass.
研究领域:
生物质能
·
化学工程
·
可持续发展
✓ 已验证
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2021
·Vol. 15
·期 12
·2000514
·
IF 2.821
Fan Xie,Hua Tang,Xin Zhao,Meng Li,Lu Li,Jiang Cheng
Silver antimony sulfide (AgSbS 2 ) has attracted great interest as a photovoltaic absorber, attributed to its suitable energy gap, large absorption coefficient, and being of relatively earth-abundant elements. However, the applications of AgSbS 2 are very limited due to the immaturity of the fabrication technology. A novel spray pyrolysis method for AgSbS 2 film deposition is reported. Selenization is the most important step to improve the device performance. The composition analysis shows that the S element in AgSbS 2 can be partly substituted by Se via heating the sample in Se vapor at 400 °C for several minutes. X-ray diffraction shows that the selenized film contains AgSbS 2 , AgSbSe 2 , and AgSbS 2− x Se x without other impurities. The Hall effect confirms a carrier concentration of 3.31 × 10 18 cm −3 , which is significantly higher than that of the untreated film and those processed in other atmospheres. The optical measurement indicates that the optical absorbance of the selenized AgSbS 2 is tremendously improved. In addition, a cascade-type energy level with the bandgap varying from 1.15 eV at the surface to 1.68 eV into the bulk is formed, resulting in an ideal energy level matching. Because of these beneficial factors, the efficiency improves significantly from 0.27% to 1.30%.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Sibo Zhang,Wanshi Zhang,Mingyu Wang,Wenhao Zhao,Huifang Xu
Polysiloxane modified phenolic porous materials are useful as lightweight thermal insulators. This work proposed an efficient and controllable process to prepare polysiloxane-resorcinol-terephthalaldehyde (SiRT) hybrid porous monolith by one-pot synthesis from monomers and ambient pressure drying. 1 H NMR, FTIR and XPS results on molecular structure confirmed the hybrid networks were composed of crosslinked polysiloxane and phenolic with chemical linkage of Schiff base via reaction of γ-aminopropyl(diethoxy)methylsilane (APDEMS) with terephthalaldehyde. The reaction was crucial to promote transformation of terephthalaldehyde for achieving homogenous hybrid prepolymer solution in one-pot synthesis. The well controlled procedure resulted in formation of intact monoliths with average values of density of 0.273 g/cm 3 , compressive strength of 2.46 MPa, and room temperature thermal conductivity of 0.052 W/(m‧K). Under 1300 °C-pyrolysis, hybrid monoliths were transformed to lightweight thermally stable insulator. Pyrolysis mechanisms under major steps were revealed by Py-GC-MS results and structural analysis on pyrolyzed derivatives. Polysiloxane-resorcinol-terephthalaldehyde hybrid and the pyrolyzed porous monoliths are potential in the field of thermal insulation due to their good comprehensive performance.
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DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Sichao Chen,Xiang Zhang,Ting Yao,Keke Wang,Lei Cao,Shixian Xiong
In this study, cerium-doped yttrium aluminum garnet (YAG:Ce) phosphors were synthesized via citric acid-assisted aerosol spray pyrolysis to optimize their luminescent properties for white light-emitting diode (LED) applications. Precursor solutions formulated with nitrates and citric acid were atomized and subsequently calcined at 1000 °C, yielding hollow spherical particles with an average diameter of 700-800 nm. X-ray diffraction (XRD) analysis revealed that pure cubic YAG phase was formed above 800 °C. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations disclosed the porous hollow morphology of the particles. By adjusting the Ce 3+ doping concentration (0.01%-3%), it was found that doping concentrations of 1-2% exhibited the strongest emission intensity under 450 nm excitation, with the emission peak located at 550 nm. Beyond 2% doping, a decrease in intensity was observed due to concentration quenching. These results demonstrated that aerosol spray pyrolysis could effectively produce high-quality YAG:Ce phosphors with controllable morphology and excellent optical properties, rendering them suitable for advanced lighting technologies.
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2026
·
IF 9.1
Chenzhirui Zhou,Cheng Tan,Yong Yu,Shi Cheng,Chaowei Ma,Jianhang Hu,Hua Wang
Lignocellulosic biomass possesses significant potential as a carbon-based renewable energy source. Fast pyrolysis can convert biomass into valuable derivatives, though achieving high selectivity for target compounds remains a challenge. In this study, acid-leached slag (ALS) derived from spent Al 2 O 3 -based catalysts was employed as a catalyst to investigate its effect on the pyrolysis products of water hyacinth (WH). Under optimal conditions of a WH/ALS ratio of 1:3 at 500 °C, the bio-oil yield reached 70.81 wt%, and furfural yield achieved 97.37 area% with a concentration of 83.96 mg/mL. This enhancement is attributed to the synergistic catalytic activity of Brønsted and Lewis acid sites on ALS, which substantially improves the directional selectivity toward furfural. Concurrently, biochar undergoes aromatization, forming aromatic ring structures that promote graphitization, while the proportion of combustible syngas rises to 99.84%. Additionally, N-containing heterocyclics from the bio-oil are redistributed into the biochar (as graphitic-N, pyrrolic-N, and pyridinic-N) and syngas. This study demonstrates an effective strategy for simultaneously valorizing WH and ALS, offering a novel approach for producing high-value chemicals through catalytic pyrolysis of lignocellulosic biomass.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 16
·22967-22974
·
IF 5.532
Guang Zeng,Ping Xu,Chen Zeng,Cunqian Fang,Yafeng Wang,Xin Yang,Mingyu Zhang,Zhean Su,Qizhong Huang
A novel single-source precursor was synthesized to prepare HfC x N 1-x /SiC multiphase ceramics by using hafnium chloride (HfCl 4 ), diallylamine (DAA) and polycarbosilane (PCS). We conducted an investigation of the synthesis process, polymer-to-ceramic conversion, as well as the microstructure and phase evolution of HfC x N 1-x /SiC multiphase ceramics with different levels of SiC content. The results showed that the core-shell particles of HfC x N 1-x -carbon were embedded homogeneously in the β-SiC matrix which is beneficial for preventing grain growth and improving oxidation resistance . Based on data from oxidation tests, the ceramics improved the oxidation temperature and remained stable at a high temperature (1500 °C) with oxidation layer formation on the surface. Due to the highly cross-linked structure without oxygen, high ceramic yield, homogeneous composition and excellent oxidation resistance of the pyrolysis product, the as-prepared precursor is a promising material for making high-performance composite ceramics.
研究领域:
材料科学
·
陶瓷与复合材料
·
聚合物衍生陶瓷
·
高温材料
·
无机合成
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Jing Gao,Yang Cao,Tao Wu,Yujiang Li
In this study, roasted spent HDS ash (sHDSc-A) was used for the first time to catalytically pyrolyze oily spent HDS catalysts (sHDSc) to improve the yield and quality of pyrolysis oil. The results showed that sHDSc-A promoted the decomposition of coke in oily sHDSc, resulting in the recovery of more oil and gas. Meanwhile, sHDSc-A significantly improved the quality of the pyrolysis oil. They inhibited the aromatization of alkanes to increase the saturation of the pyrolysis oil from 59.39% to 74.25% and the H/C radio from 1.62 to 1.72; promoted the decomposition of long-chain alkanes to increase the content of C11–C22 from 41.97% to 61.99%; enhanced the conversion of carboxylic acids to ketones led to the reduction of heteroatomic compounds such as N (56.10%–45.39%), S (66.95%–56.59%), and O (45.26%–26.70%) in the pyrolysis oil. The promotion of sHDSc-A in the pyrolysis process is attributed to the catalytic effect of the metal oxides in sHDSc-A. Among them, Al 2 O 3 and Fe 2 O 3 can promote decarboxylation of carboxylic acids and reduce O mobility, while MoO 3 and Fe 2 O 3 play a significant role in reducing coke and increasing pyrolysis oil. NiO can also promote methane vapor reforming, and thus increase the production of H 2 in non-condensable gas. This study achieves self-circulation of oily sHDSc with a “waste-treatment-waste” strategy that presents the advantage of value-added energy recovery and waste reuse.
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yanpeng Ban,Lijun Jin,Yang Li,He Yang,Haoquan Hu
Compounds with different functional groups and bridged bonds have been extensively used as model compounds of carbonaceous feedstock to investigate the mechanism of catalytic pyrolysis. Aiming to understand the structure evolution mechanism of different oxygen-containing functional groups and weak-covalent bonds during catalytic pyrolysis of carbonaceous feedstocks over calcium, polyacrylic acid, polyvinyl alcohol, polyethylene terephthalate, and polymethyl methacrylate were used as model compounds. The structural characteristics, reactivity, and pyrolysis products of model compounds with and without calcium addition were investigated by using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and in - situ pyrolysis vacuum ultraviolet photoionization time-of-flight mass spectrometry ( in - situ Py-VUV-PIMS). The results show that calcium can form calcium complexes with the carboxyl or alcoholic hydroxyl structures in the long aliphatic carbon chain, but it has no obvious effect on the structure and reactivity of the ester groups in different compounds. The pyrolysis products analysis showed that the chemical structure and decomposition pathway of the model compounds containing carboxyl or alcoholic hydroxyl groups changed significantly after calcium addition, and a large number of carbonyl compounds appeared in the pyrolysis products. This result provides a theoretical basis for understanding the mechanism of calcium-catalyzed carbonaceous feedstock pyrolysis.
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产品关联
DOI
高影响因子
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