ENERGY & FUELS
·
2025
·
IF 5.3
Qingxiang Zhang,Dengqian Zhang,Zhen Wang,Zheng Liu,Yukun Xi,Wei Zhang,Chen Zhang,Yin Liu
Catalytic transfer hydrodechlorination of plastic pyrolysis oil on supported transition-metal catalysts using isopropanol as a hydrogen donor was investigated in this work. The catalysts were characterized by N2 adsorption, X-ray diffraction, hydrogen temperature-programmed desorption, and X-ray photoelectron spectroscopy, and the reaction products were identified by GC-MS. Among various Al2O3-supported transition-metal (Cu, Co, Ni) catalysts, Cu/Al2O3 exhibited the best catalytic transfer hydrodechlorination performance due to the superior activation ability of Cu/Al2O3 for isopropanol. The doping of Ni in Cu/Al2O3 significantly enhanced its catalytic activity due to the inherent excellent hydrogenation activity of Ni, good metal dispersion, and strong Ni–Cu interaction in Ni–Cu/Al2O3. GC-MS results revealed that chlorobenzene was hydrogenated to benzene and HCl, and isopropanol was dehydrogenated to form acetone, which was subsequently transformed to methyl isobutyl ketone. The reactivities of three representative organochlorine compounds followed the order of chlorobenzene > tetrachloroethane > tetrachloroethylene. Ultradeep dechlorination of real plastic pyrolysis oil was achieved by catalytic transfer hydrodechlorination over the optimal 15Ni-10Cu/Al2O3 catalyst. The chlorine content of real plastic pyrolysis oil was reduced from 61.7 to 0.5 mg/L with a chlorine removal of 99.2% after reaction for 3 h at the reaction temperature of 210 °C.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Yueping Liu,Suning Li,Yongcheng Yang,Yongxiang Liang,Fei Wang,Xuetong Li,Deng Zhao,Yanjun Lu,Hui Liu,Shuai Guo
The aim of this study is to investigate the role of different carbon-based structures on the pyrolysis pathway and gas product distribution of polypropylene (PP). Using in situ DRIFTS coupled with thermogravimetric mass spectrometry, this study investigated the synergistic mechanisms between polypropylene (PP) and common plastics and biomass at the molecular level. The following mechanisms were revealed: 1) Polyethylene erephthalate (PET) induces demethylation of PP through oxygenated fragments, which weakens the stability of its main chain and synergistically reduces the pyrolysis temperature. The high-temperature polyene structure of polyvinyl chloride (PVC) promotes further breakage of the PP main chain, synergistically driving the directional conversion of gas products to unsaturated hydrocarbons and chlorine-containing compounds. The phenyl groups in polystyrene (PS) trigger PP activation at low temperatures, improving the yield of toluene gas. 2) PP inhibits the decomposition of blended components through physical entanglement at low temperatures. At high temperatures, polyenes, phenyl groups and other cleavage products reorganize with PP hydroxyl fragments, promoting the enrichment of olefins, aromatics and chlorinated compounds. 3) In PP-biomass systems, it is hypothesized that the PP pyrolysis pathway is altered, enhancing the selectivity for short-chain hydrocarbons and monocyclic aromatics. This effect is likely mediated through ash-catalyzed reactions and induction by oxygen-containing fragments. This study employs in situ Fourier-transform infrared (FTIR) spectroscopy to monitor in real time the molecular-level evolution of PP-based mixed waste plastics and biomass pyrolysis, revealing fundamental carbon-chain structure-property relationships. These findings establish a mechanistic framework for the rational design of high-efficiency pyrolysis systems with precisely controlled product distributions through synergistic interactions.
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高影响因子
TALANTA
·
2025
·
IF 6.1
Jiayuan Zhang,Yanxiao Jiang,Junyi Wang,Shuqi Chen,Xingshun Li,Meng Xu,Meng Zhang,Kai Yu,Daqian Song,Jie Jiang
Microplastics (MPs), a pivotal concern in environmental research due to their global ubiquity and potential ecological risks, present formidable obstacles for separation and detection within complex aquatic environment. This study innovatively established Magnetic Adsorption - Electromagnetic Heating - Pyrolysis - Mass Spectrometry (MA-EP-MS) to address the aforementioned issues. Nano-ferric oxide was modified and employed as the magnetic adsorbent in this protocol, which was executed using specialized Eh-Py-MS system. Employing polystyrene (PS) and poly (methyl methacrylate) (PMMA) as MPs models, the methodology enabled comprehensive detection of MPs across varying particle sizes in diverse aqueous matrices, including ultrapure water, tap water, lake water and seawater. The modified magnetic iron oxide nanoparticles (M-Fe 3 O 4 NPs) adsorbent demonstrated gorgeous capture efficiency exceeding 80% for both PS and PMMA MPs, while its direct introduction into the pyrolysis system contributed negligible background interference. Systematic evaluation revealed excellent methodological reproducibility, as evidenced by intra-day and inter-day relative standard deviations of 2.09% and 3.46%. Notably, the adsorption efficiency maintained highly stable across various aqueous matrices, with minimal interference observed. The established method achieved impressive detection limits, as low as 0.27 μg for PS MPs and 0.22 μg for PMMA MPs. Furthermore, through characterization using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) etc., mechanistic investigations revealed that physical adsorption likely represents the dominant interaction pathway for PS MPs capture. In summary, the established method provides a novel technical approach for detecting MPs in environmental water bodies, demonstrating considerable application potential.
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PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Juhao Wu,Hong Tian,Fan Gu,Hai Ning,Junjie Huang,Binbin Chen,Yanlin Zeng,Huimin Mao,Xinmiao Wang
Pyrolysis technique can effectively convert waste plastics into high-performance asphalt modifiers, improving the asphalt pavement performance, thus achieving the resourceful utilization of waste plastics as building materials. Selecting Polypropylene (PP) and polystyrene (PS) as raw materials, pyrolysis experiments were conducted to explore their synergistic interaction. Using Thermogravimetric analysis (TGA), tube furnace, and gas chromatography-mass spectrometry (GCMS), the effects of plastics mixing ratio and Ni loading in HZSM-5 on the pyrolysis products and heavy oil composition were investigated. Based on the optimal heavy oil, the high and low temperature performance and aging resistance of the heavy oil modified asphalt were quantitatively evaluated. The results showed that the PP/PS co-pyrolysis exhibited higher conversion efficiency, with a 1:3 ratio maximizing liquid yield at 74.26 %. Ni-modified HZSM-5 effectively boosted the production of aromatic hydrocarbons in heavy oil while inhibiting the generation of phenols, acids, organosilicons and other non-hydrocarbon byproducts. The optimal Ni loading was 10 wt%, which maximized aromatic hydrocarbon content at 81.36 % within 90.6 % polycyclic aromatic hydrocarbons (PAHs), achieving the best modulation of pyrolysis heavy oil components. The addition of heavy oil significantly improved the high-temperature stability and aging resistance of asphalt, though impairing low-temperature cracking resistance. The optimal oil content was 6 wt%, making the softening point increased by 10.3°C. This advancement promoted the conversion of waste plastic heavy oil into high-performance asphalt modifiers to avoid difficult combustion, providing theoretical support and technical guidance for its high-value application in the asphalt pavement field.
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高影响因子
FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
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高影响因子
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
·
2019
·Vol. 55
·期 10
·998-1008
·
IF 1.043
Chuanzhang Ge,Fan Zhenghua,Shen Long,Qiao Yongmin,Ling Licheng,Wang Jianming
A scalable synthesis of unique pyrolysis carbons from phosphorus-doped epoxyphenolics (EPN) through a facile curing and pyrolysis process is reported. The obtained carbons with a high pyrolysis yield of ca. 48% are investigated by SEM, TEM, XRD, Raman and nitrogen adsorption, and evaluated as anode for LIBs. The results show that the nanocrystal structure, proportion of defect sites and porosity (nanovoids) of the obtained carbons are highly dependent on pyrolysis temperature, thus affecting their electrochemical properties. The EPN carbon pyrolyzed at 900°C (EPN900) delivers the largest reversible capacity of nearly 420 mA h g –1 at 0.1 C, which is higher than the theoretical capacity of graphite, mainly resulting from lithium-ions insertion into the turbostratic nanosheets and absorption on defect sites. While the EPN carbon pyrolyzed at 2800°C (EPN2800) exhibits a balanced lithium storage performance with relatively large reversible capacity of 343 mA h g –1 , high initial coulombic efficiency (~86%), and superior cycling performance (299 mA h g –1 after 100 cycles at 0.3 C). This work provides a feasible solution for the large-scale preparation of high performance anode material and deepens the high-value utilization of the staple epoxy product.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.4
Xiankang Liu,Jun Yang,Qin Peng,Zhigang Xie,Yuhan Wang,Xingji Chen,Taiping Xie,Quanzhou Chen,Meiying Huang
With the growing popularity of coffee culture, discard coffee grounds, as a renewable resource, can be converted into biochar through pyrolysis and used to remediate heavy metal-contaminated wastewater. However, original biochar adsorbents mainly remove lead (Pb 2+ ) through physical processes, resulting in low adsorption capacity, poor selectivity, and potential secondary lead leaching. We designed a functional coffee grounds biochar (PBCx) via pyrolysis-H₃PO₄ activation-secondary pyrolysis coupling technology. The optimal PBC3 absorbent possesses abundant microporous structure and a high specific surface area (102 m 2 /g), exhibiting an adsorption capacity of 166 mg/g for Pb 2+ , significantly higher than unactivated biochar (BC) under the same conditions. Mechanism studies confirmed that the superior adsorption performance stems from functional group anchoring of PBC3, resulting in highly stable phosphate and carbonate mineral phases, and the lone pair electron coordination of P O and C O groups. This research provides a high-value and environmentally friendly pathway for the resource utilization of waste coffee grounds, while also offering a novel strategy for the industrial application of heavy metal adsorption.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.3
Jiayun Su,Minfeng Huang,Jiankun Wu,Jianyu Wu,Yuying Yang,Yan Yu,Rilong Yang
As a renewable building material, wooden material is susceptible to frost and icing when exposed to harsh outdoor conditions, which not only severely affects the service life of wood but also cause significant safety hazards. Constructing superhydrophobic wooden surfaces with photothermal functions is an effective way to delay droplet freezing and ice accumulation. However, this modification strategy always involves complex preparation processes, and the durability of these superhydrophobic wooden surfaces is unsatisfactory. In this work, a one-stone-two-birds tactic to construct durable superhydrophobic wood/bamboo surface with photothermal effect was proposed. By thermally decomposing wood pre-coated with a polydimethylsiloxane/hydroxyapatite nanospheres (PDMS/HAP) layer, PDMS was converted into silica nanoparticles with silane on the surface, and a carbon layer with photothermal conversion properties was formed on the wooden surface. The simultaneous generation of hydrophobic silica nanoparticles and a carbon layer endowed the wood/bamboo surface with durable superhydrophobic properties and photothermal conversion capabilities. This method can be applied to various wood species and bamboo. The obtained wooden superhydrophobic surface exhibited a water contact angel of 160.5°, and has excellent durability. This superhydrophobic surface could not only withstand physical abrasion such as sandpaper abrasion and water impact, but also maintain its superhydrophobicity after exposure to chemical corrosion and UV irradiation. This superhydrophobic layer also provided the wooden materials with good dimensional stability and moisture resistance. In addition, the photothermal conversion effect enabled the wood surface to rapidly rise to 55.3 °C under one sun illumination, and ice crystals slid off its surface within 8 s. This work presents a simple and promising strategy for constructing photothermal and superhydrophobic layer on wood/bamboo surface, and is expected to mitigate the frosting and icing problems of wooden building materials in cold conditions and extend their service life.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Zhuohan Zhang,Zhichao Yu,Lian Cong,Lixiang Ma,Yuan Li,Zhaoyang Liu,Yaokun Fu,Lu Zhang
MgH 2 exhibits significant potential as promising candidates for next-generation hydrogen storage solutions, owing to excellent hydrogen storage capacity. However, its high thermodynamic stability and kinetic barriers result in sluggish dehydrogenation kinetics and high dehydrogenation temperatures. Herein, oxygen vacancy (O V )-rich CeO 2 @C effectively weakens the Mg–H bond energy, which is manifested as the elongation of the Mg–H bond. Moreover, the O V -rich CeO 2 @C reacts with H 2 to form CeH 2.73 , which enhances hydrogen diffusion within the Mg/MgH 2 system. Meanwhile, the formation of CeH 2.73 promotes the formation of O V within the MgH 2 -CeO 2 @C, further facilitating the dehydrogenation of MgH 2 . Thereby, the synergistic effect of the O V -rich CeO 2 @C and CeH 2.73 lower the dehydrogenation temperature of MgH 2 and enhance kinetic performance. The MgH 2 -CeO 2 @C-3h behaves the most optimal dehydrogenation performance, achieving a release of 4.88 wt% H 2 within 10 min at 350 ℃. The initial dehydrogenation temperature of the MgH 2 -CeO 2 @C-3h is reduced to 274 ℃, and the dehydrogenation activation energy ( E a ) is lowered to 99.13 kJ mol –1 , compared to 327 ℃ and 160.7 kJ mol –1 for pristine MgH 2 . This work provides new insights into designing O V -rich metal oxide catalysts for MgH 2 .
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 6
·7916-7922
·
IF 3.45
Ruichong Chen,Jianqi Qi,Xiaofeng Guo,Diyin Ye,Xiuling Wang,Qiwu Shi,Di Wu,Zhijun Liao,Tiecheng Lu
B 4 C hollow microspheres have been proposed as one of the promising ignition capsules for inertial confinement fusion (ICF). It is worth noting that the selection of easier-to-remove substrate materials is the key to obtaining B 4 C hollow microspheres . In this work, B 4 C core-shell microspheres with a uniform structure are prepared by the wet coating method on a PAMS substrate. After the calcination , the complete thermal decomposition of the PAMS substrate leads to a hollow structure B 4 C ceramic microsphere. The effects of solid content of coating slurry on the morphology and microstructure of the B 4 C core-shell microspheres were investigated in detail. The result shows that the spacing of the B 4 C particles in the slurry gradually decreases with increasing the solid content, resulting in an increase in the surface tension of the slurry and an improved stabilization, which helps to optimize the surface roughness and sphericity of the B 4 C microspheres.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiangtao Meng,Tao Wang,Lei Ren,Jing Wang,Yuanyuan Zhang,Jingkuan Li,Fei Wang
Stage-matched framework reveals fuel-N pathway shifts. • Microwave shifts NH 3 and HCN release to lower temperature regions. • Microwave enriches amines and nitrile precursors in tar at lower temperatures. • Microwave promotes early char deoxygenation and condensation. • Polar O/N activation couples char-N reconstruction with tar-N evolution. Microwave-assisted pyrolysis shows promise for the clean conversion of N-rich biomass, yet its mechanism for regulating nitrogen migration remains unclear. Deashed sewage sludge and protein-derived amino acid models were employed to contrast microwave and conventional pyrolysis. This comparison utilized a reaction-stage-referenced framework based on the characteristic release regions of N-containing gases. Microwave heating did not change the basic nitrogen release pattern, with NH 3 as the dominant product and HCN as the secondary product, but substantially altered the temperature-dependent progression of the fuel-N conversion pathway. Under the present microwave experimental configuration, substantial fuel-N conversion was observed within the measured 190–300 °C range, occurring at lower measured temperatures than under conventional pyrolysis and accompanied by marked changes in O/N-containing structures. Amine intermediates were enriched in tar, and the tar-N fraction increased from about 44% to 87%, driving NH 3 release to lower temperatures. At 300–500 °C, these intermediates further underwent dehydrogenation, cyclization, and nitrilation under microwave effects, forming nitriles and low-carbon mono‑nitrogen compounds and enhancing HCN release around 300 °C. As a result, the characteristic NH 3 and HCN release regions were recorded at lower measured temperatures in the microwave system than in the conventional system. Meanwhile, microwave heating promoted early char deoxygenation and condensation, as reflected by protein-N conversion to pyrrolic-N, pyridinic-N, and nitrile-N, removal of C O and O-C=O groups, reduced interlayer spacing, and enhanced microcrystalline stacking. Tar evolved from heterocyclic and long-chain N-containing compounds toward light aromatics, oxygenated species, and low-carbon nitriles. A three-phase network is proposed wherein tar acts as an intermediate pool connecting char-N reconstruction with NH 3 /HCN release. This study provides mechanistic insights into fuel-N migration during microwave and conventional pyrolysis of N-rich sewage sludge. Download: Download high-res image (180KB) Download: Download full-size image
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Jiawei Han,Peng Lv,Xudong Song,Juntao Wei,Yonghui Bai,Jiaofei Wang,Weiguang Su,Guangsuo Yu
Utilizing carbon-neutral biomass reduces reliance on fossil fuels and lowers carbon emissions. Although thermochemical conversion is efficient, it consumes feedstock for heat, reducing biomass conversion efficiency. Molten salts can enhance reactions and store solar energy; consequently, the coupling of solar energy with molten-salt-assisted biomass thermochemical conversion has attracted significant attention. This study evaluated bio-oil and gas production characteristics from biomass, cellulose, and lignin via conventional and catalytic pyrolysis (the latter using ZnCl 2 , CaCl 2 , and NiCl 2 ) in molten salts. Analysis of the pyrolysis gases and bio-oil revealed the effects of molten salts and catalysts on product generation from biomass, cellulose, and lignin, and suggested potential reaction mechanisms. Results show molten salts and catalysts boost hydrogen intensity: conventional pyrolysis of biomass in molten salts raises it by up to 62.50%, and catalytic pyrolysis by up to 172.67%. Molten salts and catalysts also reduce bio-oil peak area. Catalysts promote deep decomposition, reducing oxygen-containing compounds in detectable volatile compounds. Ni catalysts promote dehydration-condensation, consuming the most water but producing the least H 2 . Zn catalysts promote dehydration, dehydrogenation, and in-situ water reforming, greatly reducing bio-oil oxygenates; and polycondensation releases large-scale H 2 . Ca catalysts show pronounced decarboxylation and dehydrogenation, with feedstock-dependent performance.
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高影响因子
危险品化学品经营许可证（带存储）