APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Yongyu Li,Jianjun Chen,Yaping Wang,Huiji Li,Jihong Yin,Mengyan Li,Ling Wang,Haijie Sun,Lingxia Chen
A one-step direct pyrolysis method without any post-treatment steps and a mass yield of up to 69% was realized for preparing N-doped carbon dots (NCDs). The NCDs exhibit excellent excitation-independent blue fluorescence with quantum yield (QY) of 65.5%, and their luminescence mechanism was explored based on optical properties and structural composition, which mainly originates from surface state photoluminescence (PL). The NCDs display highly selective and sensitive detection of Fe 3+ in tris-HCl buffer system, a good linear relationship between PL intensity ratios and Fe 3+ concentrations was obtained in concentration range of 0 to 400 μM with a low LOD of 0.703 μM. The formation of ferric hydroxide colloid is the main reason for the specific recognition of Fe 3+ by NCDs, and buffer solution plays a key role in the formation of ferric hydroxide colloid and selective detection of Fe 3+ . The sensing mechanism is a dynamic quenching electron transfer process in the action of hydrogen bonding and colloidal adsorption. Three real water samples were applied to evaluate actual application of NCDs probe, satisfactory recoveries (93.5%–105.6%) indicate that NCDs has great practical potential for detection of metal ions in environmental water assays.
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高影响因子
ENERGY & FUELS
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2020
·
IF 3.421
Tawanda Matamba,Arash Tahmasebi,Salman Khoshk Rish,Jianglong Yu
This study reports the role of pressure (0.1–4.0 MPa) and temperature (600–900 °C) in flash pyrolysis of palm kernel shell (PKS). The main objective was to study the extent to which pressure affects the mechanism of pyrolysis reactions to enhance the selective production of target products. Higher pressures and temperatures selectively promoted the generation of polycyclic aromatic hydrocarbons (PAHs) and H2 gas. Bio-oil samples generated at lower temperatures and pressures were mainly composed of phenolics. Increasing the pressure and temperature favored the selective formation of phenanthrene, fluoranthene, pyrene, fluoranthene, and fluorene, which reached 96.17 area %. Elevated temperatures and pressures enhanced hydrogen transfer into a light gaseous phase. The yield of H2 peaked at 40.82 g of H2/kg of PKS at 900 °C and 2.0 MPa. The results obtained in this study implied that the pyrolysis of biomass at elevated pressures can be an effective method for polygeneration of hydrogen gas and PAHs as chemical feedstocks.
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高影响因子
Journal of Materials Chemistry C
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2025
·
IF 5.1
Jin Chai,Caiqin Su,Yide Han,Wen-Hao Li,Nan Wang,Wengao Zhang,Xia Zhang
Multicolor fluorescent carbon dots (CDs) have attracted considerable attention because of their prospect applications in advanced information encryption and anti-counterfeiting. Herein, we describe a simple solid-phase pyrolysis that uses o-phenylenediamine as the carbon source and exploits the deliberate selection of different solids. The resulting CDs emit bright blue, yellow, or red fluorescence, are accordingly designated as B-CDs, Y-CDs, and R-CDs, all of which exhibit excellent optical properties and outstanding photothermal stability. Detailed characterization indicates that the distinct photoluminescence arises from differences in particle size, surface functional groups, and heteroatom (N, S) doping. Density functional theory (DFT) calculations reveal that the emission redshift originates from bandgap narrowing induced by surface functional groups and expanded π-conjugated domains. Total and projected density of states (TDOS/PDOS) analyses further confirm that heteroatom incorporation generates localized states and surface defects, which collectively reduce the bandgap and induce the observed redshift. Furthermore, these multicolor CDs serve as efficient fluorescent inks, demonstrating superior performance in anti-counterfeiting and information encryptions. This study not only offers a new strategy for synthesizing multicolor-emitting CDs, but also underscores their potential in advanced security technologies.
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2025
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IF 10
Guangzhao Ran,Xiaohua Li,Shanshan Shao,Shiliang Wu
The convergence of agricultural waste recycling and retired lithium-ion battery (LIBs) upcycling presents a critical pathway for sustainable environmental management.This study systematically evaluates two innovative strategies, in-situ thermal reduction (ISTR) and acid-leaching loaded catalysts (ALLC), for repurposing cathode materials nickel manganese cobalt oxide, lithium cobalt oxide and lithium iron phosphate (NCM, LCO, LFP) in cascade biomass conversion systems for hydrogen production. Through controlled pyrolysis experiments, it was demonstrated that NCM cathodes undergo carbothermal reduction at 500 °C, with derived NiO species significantly enhancing biomass pyrolysis gas cracking with hydrogen yield of 19.45 mmol/g. Comparative acid leaching analysis shows that metal recovery behaviors are significantly different. Among them, the leaching efficiency of LCO/LFP using oxalic acid is higher. The leached LCO catalyst exhibits excellent carbon-carbon bond cleavage ability, achieving a hydrogen yield of 26.2 mmol/g in the reforming process. Crucially, ISTR-NMC cathode systems facilitates biomass bond cleavage and cracking, whereas ALLC LCO and LFP exhibit enhanced catalytic reforming performance, and an optimized integration work combining ISTR-treated NMC with ALLC-LCO, achieving a record 28.5 mmol/g hydrogen production through synergistic cascade reactions.This study reveals metal speciation-dependent catalytic mechanisms and closed-loop design principles for synergistic battery recycling and biomass valorization, aiming at circular economy solutions for dual waste streams via hybrid thermal-catalytic processing.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Kai Li,Jia-hao Yu,Bo Wang,Yong-sheng Ma,Qi Niu,Bin Hu,Xin-hua Yuan,Qiang Lu
The selective pyrolysis of cellulose to levoglucosenone (LGO) remains challenging, primarily due to the lack of catalysts with tailored active sites and appropriate modification of cellulose microstructures, both critically determining reaction pathways and product selectivity. To realize the high-selectivity conversion of cellulose to LGO, this study synthesized metal-organic frameworks (MOFs) with tunable channel structures using ZIF-67 as the precursor, which were subsequently subjected to partial phosphidation to prepare MOF-derived phosphorized porous carbon (CoP/N-C) catalysts for the catalytic pyrolysis of amorphous cellulose (AMC). The effects of catalyst characteristics on the product distribution and LGO yield during AMC pyrolysis were systematically investigated using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and a lab-scale setup, while the catalytic pyrolysis mechanisms under the coupled effects of catalyst properties and reaction conditions were comprehensively elucidated. Results revealed that CoP/N-C significantly enhanced LGO yield from AMC pyrolysis. Particularly, the CoP (100) /N-C catalyst (synthesized with a Co:P ratio of 9:100) demonstrated optimal performance, achieving maximum LGO yields of 24.76 wt% in Py-GC/MS experiments and 18.89 wt% in lab-scale tests under optimized conditions (pyrolysis temperature: 320℃, catalyst:AMC ratio: 4:1). This study systematically revealed the structure-activity relationship between catalyst characteristics and LGO formation mechanisms, providing critical insights for further catalyst optimization and LGO yield enhancement.
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高影响因子
Energies
·
2025
·Vol. 18
·期 10
·2419
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IF 3.2
Yujia Feng,Jing Li,Gengqi Liu,Da Yao,Jinhua Li,Quan-De Wang,Zhaowen Wang,Jinhu Liang
This paper reports a comparative study on the high temperature pyrolysis characteristics of three C9H12isomers, including n-propylbenzene (PBZ), 1,3,5-trimethylbenzene (T135MBZ), and 1,2,4-trimethylbenzene (T124MBZ), via single-pulse shock tube (SPST) experiments and kinetic simulations. The SPST experiments were conducted in the temperature range of 1100–1700 K, at pressures of 10 bar and 15 bar, with a fixed fuel concentration of 200 ppm. The reaction time was approximately 1.8 ms for all of the experiments. The distributions of the pyrolysis products were quantitatively analyzed as functions of pressure and temperature. A detailed kinetic mechanism was used to simulate the experimental results, and it is demonstrated that the mechanism can capture the pyrolysis characteristics reasonably well. Both experimental and simulation results reveal that PBZ exhibits higher fuel reactivity than T124MBZ and T135MBZ under the studied conditions. Pyrolysis of all three C9H12isomers generates key soot precursors, including acetylene and benzene. Sensitivity and rate-of-production (ROP) analyses indicate similar primary pyrolysis pathways. The benzyl radical is first formed through the dehydrogenation reaction and then it undergoes a series of decomposition reactions leading to the detected small hydrocarbon species. This study not only provides an in-depth understanding of the high temperature pyrolysis characteristics of the three C9H12isomers, but also provides essential validation data for the development and optimization of chemical kinetic mechanisms for alkyl aromatic hydrocarbons.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2024
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IF 8.3
Kaifeng Wang,Wenshuang Chu,Yujie Chen,Hua Li,Hezhou Liu
The widespread usage of carbon fiber-reinforced polymer composites imposes serious challenges in disposing of end-of-life and wasted products. Pyrolysis recycling has become an efficient strategy to decompose the resin matrix and extract the fiber, while the bottleneck lies in maintaining the structural integrity and physicochemical properties of the recycled fibers, along with reconstructing corresponding composites with performance efficiency. In this work, a two-step pyrolysis strategy is demonstrated to decompose the resin matrix and remove the carbon residues without damaging the internal structure of the recycled carbon fiber felts (rCFFs), followed by surface modification to facilitate the reconstruction of rCFFs-reinforced phenolic resin composites. The composites achieve remarkable electromagnetic interference (EMI) shielding performance in the X band with maximum EMI shielding effectiveness value of 70.5 dB, along with impressive flame-retardant performance under a high heat flux of 50 kW/m 2 . Besides, more than 80 % EMI shielding effectiveness is maintained after 10 pyrolyzing cycles by optimizing the pyrolysis parameters. Catering to maintaining the intrinsic properties of the recycled carbon fibers by proposing comprehensive recycling strategy, the synthesis of rCFFs-based materials is of great significance for promoting the substitution of pristine EMI shielding counterparts and the practical reutilization of carbon fiber resources.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Chenhao Li,Yi Niu,Linlin Yi,Yaoqiang Li,Jia Fu,Fang Tang,Kaiyuan Li,Yanyan Zou
This paper explores the application of zeolitic imidazolate framework-8 (ZIF-8) in pyrolytic disposal of poly(vinyl chloride) (PVC), with the goal of assessing the in situ catalytic removal and capture effect of ZIF-8 on Cl, elucidating the migration pattern of Cl, revealing the mechanism of in situ Cl capture by ZIF-8. The results demonstrate that excellent catalytic and Cl trapping properties are exhibited by ZIF-8, and an additional 311.1 mg/g of organic Cl from PVC is facilitated to be removed at 250 ºC. The catalytic effect enhances Cl trapping at low temperatures. The solid-solid reaction between PVC and ZIF-8 during in situ pyrolysis significantly improves Cl capture compared to ex situ pyrolysis. During in situ pyrolysis, ZIF-8 shows excellent Cl capture between 250 and 350 ºC, where Cl is primarily captured in the solid phase as inorganic Cl. ZIF-8 achieves optimal Cl capture at 300 ºC, reaching a peak HCl removal rate of 89.5 %. At this temperature, the content of solid-phase inorganic Cl reaches a maximum of 442.0 mg/g, accounting for 78.7 wt% of the total Cl content. The key to Cl capture lies in the chemical adsorption sites of Zn²⁺ and organic ligands in the ZIF-8 structure, which can react with Cl in both solid-solid and gas-solid reactions. Additionally, crystals formed during pyrolysis create an adsorption barrier, ultimately enabling efficient Cl capture.
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2020
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IF 8.208
Qiuhao Wu,Yunpu Wang,Yujie Peng,Linyao Ke,Qi Yang,Lin Jiang,Leilei Dai,Yuhuan Liu,Roger Ruan,Donghua Xia,Li Jiang
Microwave-assisted pyrolysis of waste cooking oil is an environmentally friendly and economical method for obtaining benzene, toluene, ethylbenzene, and xylene (BTEX) which are important industrial chemicals. This study provides new routes to produce of BTEX and the utilization of waste cooking oil. The effect of catalytic temperatures (350 °C, 400 °C, 450 °C, 500 °C, and 550 °C), types of metal oxide (CoO, NiO, ZrO 2 , SrO, CeO 2 , and CaO), catalytic modes (ex-situ mixed catalysis, ex-situ separate catalysis, and in-situ separate catalysis), and ratio of HZSM-5 to metal oxide (HZSM-5 only, 4:1, 2:1, 1:1, 1:2, and CaO only) were studied. Results showed high catalytic temperature promoted the formation of monocyclic aromatic hydrocarbons at the cost of a decrease in bio-oil yield. But the concentration of BTEXS (benzene, toluene, ethylbenzene, xylene, and styrene) only increased from 256.58 mg/ml to 259.55 mg/ml with a temperature increase from 500 °C to 550 °C. Alkaline earth metal oxides (CaO, SrO) showed a significant deoxygenation capability during co-catalysis with HZSM-5. However, when CaO was applied under ex-situ mixed catalysis, the concentration of polycyclic aromatic hydrocarbons was up to 35.47%, which was much higher than 9.18% under HZSM-5 only. Also, the concentration of BTEXS decreased from 256.58 mg/ml (HZSM-5 only) to 167.54 mg/ml (HZSM-5 mixed with CaO). Further investigation of catalytic mode showed that ex-situ separate catalysis was more suitable for co-catalysis of alkaline earth metal oxides and HZSM-5. The concentration of BTEXS were both significantly higher than that of HZSM-5 only, which increased by 121.81 mg/ml for CaO and 108.52 mg/ml for SrO under ex-situ separate catalysis. Further study showed that the highest concentration of BTEXS was 702.20 mg/ml obtained when the ratio of HZSM-5 to CaO was 2:1. It was almost 2.8 times higher than HZSM-5 alone and 42.2 times higher than non-catalytic results.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2020
·
IF 3.905
Chaoyue Shen,Xiying Jia,Yifei Chen,Licong Lu,Fangqi Wang,Yi Wei,Fengwen Yu
Molten carbonate pyrolysis is proposed to convert digestate (DE) into biobased monophenols coupled with a metal-modified HZSM-5 catalyst. The results indicated that Fe/HZSM-5 was the most suitable catalyst for this process. The optimum reaction conditions for the process were WHSV = 15 h −1 at a pyrolysis temperature of 430 °C and a catalytic cracking temperature of 475 °C, and 79.22 % of monophenol components were achieved in the bio-oil. A kinetic study on the digestate with carbonates indicated that the alkali metal ion in the molten carbonates attached to the β-O-4 bonds and branch methoxy group of lignin, which promoted the removal of these functional groups, resulting in a reduction in the activation energy during monophenol generation. The Fe/HZSM-5 catalyst reinforced the generation of monophenol compounds in both concentration and yield. Compared with molten carbonate pyrolysis, the Fe on the catalyst not only benefited the breaking of β-O-4 bonds and methoxy groups of lignin but also lowered the temperature during molten carbonate pyrolysis to minimize the secondary cracking of phenolic compounds.
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高影响因子
APPLIED THERMAL ENGINEERING
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2020
·
IF 4.725
Qi Sun,Lin Jiang,Huiqi Cao,Jinhua Sun,Ganbin Liu
Statistics have indicated that industrial accidents of ammonium nitrate were primarily caused by uncontrolled external fires where heating was dominantly controlled by radiation, and yet existing studies at milligram scale cannot fully simulate the real fire scenarios. To explore the pyrolysis behavior in typical fires, this study conducted thermal radiation experiments using pure ammonium nitrate, and its mixtures with copper oxide and sulfuric acid. Different from the pyrolysis process identified in milligram scale tests, the bench-scale pyrolysis of ammonium nitrate under radiation consisted of four stages. Pyrolysis structure model of each stage was built to reveal the differences in dominated thermal behavior. Results indicated that two additives had different thermo-chemical effects on pyrolysis of ammonium nitrate. Sulfuric acid accelerated the reaction rate of each stage by generating catalytic nitric acid; copper oxide reduced the number of reaction stages into three via surface absorptions. The time and mass loss rate of different stages were determined. Recommendations on effective emergency response were made to prevent the transition of slow decomposition into fast decomposition, and thus to intervene the fire-induced domino effect of ammonium nitrate. This study helps to understand the pyrolysis behavior of ammonium nitrate under fire exposure, and provides insights for pyrolysis modeling and firefighting in industry of interest.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
·
IF 6.437
Yang Li,Bin Hu,Hao Fu,Zhen-xi Zhang,Zi-teng Guo,Guan-zheng Zhou,Ling-jun Zhu,Ji Liu,Qiang Lu
4-Vinylphenol (4-VP) is a value-added phenol compound, which can be obtained from the pyrolysis of herbaceous biomass, and its yield can be further improved through the in-situ catalytic fast pyrolysis process. Herein, a barium-magnesium mixed metal oxide (BaMg-MMO) catalyst was developed and employed for the selective production of 4-VP from bagasse fast pyrolysis. The effects of Ba/Mg molar ratio in the BaMg-MMO catalyst, pyrolytic temperature, catalyst-to-bagasse (CA-to-BA) ratio were carefully investigated based on pyrolysis-chromatography/mass spectrometry (Py-GC/MS) tests. The 4-VP yield reached a maximal of 7.3 wt% with the corresponding selectivity of 44.4% at 300 °C under the Ba/Mg molar ratio of 1:1 and the CA-to-BA ratio of 4:1, compared with that of 5.0 wt% in the non-catalytic process. Moreover, a series of lab-scale fast pyrolysis tests of bagasse were carried out in a fixed bed reactor using BaMg-MMO with a Ba/Mg molar ratio of 1:1. The highest 4-VP yield and selectivity were 7.1 wt% and 56.6% at 300 °C with the CA-to-BA ratio of 1:1. The results indicated that BaMg-MMO could provide a promising catalytic performance on the formation of 4-VP during the fast pyrolysis of bagasse.
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高影响因子
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