SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Jiahao Li,Rong Cheng,Jiaao Chen,Jirong Lan,Shiyao Li,Min Zhou,Tianyu Zeng,Haobo Hou
A series of nitrogen-doped carbon aerogels (NCAs) were obtained through phase reaction polymerization and different carbonization temperatures to enhance adsorption efficacy of hexavalent chromium (Cr[VI]) from wastewater significantly. Factors that influence adsorption properties of carbon aerogel microspheres toward Cr(VI), such as pH, adsorbent content, initial Cr(VI) concentrations, and coexisting anion, were investigated. Three isotherm (Langmuir, Freundlich, and Sips) and three kinetic (pseudofirst-order, pseudosecond-order, and Elovich) models were used to interpret the adsorption process. The adsorption capacity of Cr(VI) reached 180.62 mg·g −1 , which was superior to that of most aerogel adsorbents. In addition to the adsorption effect, the XPS results also showed that N-containing groups on the NCA surface reduce the adsorbed Cr(VI) to the less toxic Cr(III). The prepared sorbent demonstrates a negligible loss in adsorption capacity after 6 cycles. NCAs show acceptable application prospects in selective removal of Cr(VI) ions.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2014
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IF 5.039
Yangyang Qian,Jie Zhang,Jie Wang
The pyrolysis of rice husk was conducted in a fixed-bed reactor with a sweeping nitrogen gas to investigate the effects of pressure on the pyrolytic behaviors. The release rates of main gases during the pyrolysis, the distributions of four products (char, bio-oil, water and gas), the elemental compositions of char, bio-oil and gas, and the typical compounds in bio-oil were determined. It was found that the elevation of pressure from 0.1 MPa to 5.0 MPa facilitated the dehydration and decarboxylation of bio-oil, and the bio-oils obtained under the elevated pressures had significantly less oxygen and higher calorific value than those obtained under atmospheric pressure. The former bio-oils embraced more acetic acid, phenols and guaiacols. The elevation of pressure increased the formation of CH 4 partially via the gas-phase reactions. An attempt is made in this study to clarify “the pure pressure effect” and “the combined effect with residence time”.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Lingxi Bai,Haonan Li,Xingxiang Wang,Xin Pu,Zhipeng Lin,Shuzhen Zhou,Jiangbing Li,Xiaogang Wang,Jie Li,Lingtao Kong,Lanli Bai,Jichang Liu
Biomass valorization plays a vital role in ecological conservation and the advancement of a circular economy, while posing significant scientific challenges. This work successfully constructed a novel tandem catalytic system (ZnZrOx-ZSM-5) for the efficient production of sustainable monocyclic aromatics (SMAs) via the ex-situ catalytic pyrolysis of cotton stalk. Compared to the sole ZSM-5, the tandem catalyst significantly enhanced the absolute yield of SMAs from 8.2 % to 26.8 %. Combined various structural characterization and carefully catalytic experiments, it was revealed that pyrolysis volatiles derived from cotton stalk first encounter the ZnZrOx bed-rich in oxygen vacancies and basic sites, where compounds such as AAAKs (alcohols, aldehydes, acetic acid, and ketone) and bulky alkoxy-phenols are preferentially pre-cracked into alkanes/alkenes and light phenols, respectively. Subsequently, within the ZSM-5 bed, these pre-cracked intermediates enhance the formation of SMAs by a series of reactions-including Diels-Alder condensation, dehydroxylation, and aromatization with hydrocarbon pool species. Simultaneously, GC‑MS analysis confirmed that the introduction of ZnZrOx effectively suppresses the formation of bulky polycyclic molecules (e.g., naphthalene, phenanthrene), thereby alleviating catalyst pore blockage and deactivation.
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高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yubing Cao,Ruitong Gao,Junwei Lei,Yuandong Hou,Min Xu,Shuang Cao,Zhaojun Chen,Yajing Duan,Hui Du
Pyrolysis presents a promising pathway for the chemical recycling of waste plastics. However, the pyrolysis of chlorine-containing plastics can generate hazardous chlorinated compounds. Therefore, it is critical to investigate the migration, transformation, and removal of chlorine during pyrolysis to enable environmentally sustainable recycling. In this study, we combined kinetic analysis with in-situ FTIR and TG-FTIR-MS to elucidate the mechanisms of chlorine migration and transformation during the pyrolysis of chlorinated mixed plastics (CMPs). An efficient dechlorination process using calcium-based additives was also developed. The results indicate that the pyrolysis of CMPs occurs in two distinct stages (Stage Ⅰ and Stage Ⅱ), with average apparent activation energies (Ea) of 166.69 kJ/mol and 243.86 kJ/mol, respectively. The process followed mechanism functions involving diffusion, nucleation, and phase boundary reactions. Initially, weak C–Cl and C–H bonds ruptured preferentially, releasing HCl. This was followed by synergistic cleavage of the main C–C chains, generating radicals such as methyl (·CH₃), butyl (·C₄H₉), propylene (·C₃H₅), and phenyl (·C₆H₅). The combination of these radicals with free chlorine radicals (·Cl) resulted in the formation of diverse and complex chlorinated organic compounds. For dechlorination, Ca(OH)₂ was identified as the optimal calcium-based additive, achieving a chlorine removal efficiency of 97.75 %, attributed to its self-decomposition behavior. This study clarifies the transformation pathways of chlorinated pollutants during pyrolysis and proposes a practical calcium-based dechlorination strategy to support sustainable chlorine management in the valorization of plastic waste.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2026
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IF 7.9
Haifeng Jiang,Jiahao Qi,Jian Xing,Hanwen Zhou,Zheng Cao
The co‑catalytic pyrolysis of waste polyethylene terephthalate (PET) with urea under an Ar atmosphere offers a sustainable route to prepare high‑value aromatic nitriles from plastic‑waste recycling. However, low aromatic nitrile yields greatly hinder the scaled-up deployment and practical use of this PET pyrolysis strategy. This work uses transition metal (Ni, Cu, Mn)-doped Zn-Co spinel catalysts to regulate the product distribution during the catalytic pyrolysis of PET-urea mixtures to produce aromatic nitriles. The results reveal that the nickel-doping spinel catalyst exhibits the optimal promotion effect. After adding 10 wt% catalyst with a total mass of PET-urea mixture, the normalized GC-MS peak-area percentages of nitrogen-containing compounds and nitriles in liquid condensate reach 94.6% and 52.3% at 550 ℃, respectively. Compared with the non-catalyst system, the relative contents of nitrogen-containing compounds and nitriles increased by 7.95% and 30.39%, respectively. Among all aromatic nitriles, 1,4-benzenedicarbonitrile shows a relative proportion of 22.7%. Further results indicate that the Ni-doped spinel catalyst facilitates the formation of C N-containing intermediates during the PET-urea co-pyrolysis process. This work presents a catalytic method to raise the relative content of aromatic nitriles in condensed liquid from the argon‑atmosphere PET‑urea catalytic co‑pyrolysis.
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高影响因子
FUEL
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2026
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IF 7.8
Zeyu Wu,Zhen Yang,Xinyue Zhao,Xi Gao,Yuan Xue,Mo Zheng,Liangyuan Jia,Zhongyue Zhou
Catalytic co-pyrolysis of lignin and hydrogen rich plastics with zeolite can potentially mitigate the problems including low conversion and severe coking with lignin. However, controversial conclusions still exist regarding the synergistic effects and cross-reaction pathways between the two feedstocks, resulting from complex product composition and limited testing methods. To clarify the aforementioned problems, the current study investigated the catalytic co-pyrolysis of model compounds from lignin (guaiacol) and polyethylene with HZSM-5 by using in-situ sampling and online vacuum ultraviolet photoionization mass spectrometry (VUV-PIMS). Specifically, C6 hydrocarbons (n-hexane, hexene, and hexadiene) with different unsaturation degrees were chosen to understand the role of plastic-derived volatiles in co-pyrolysis. Pyrolysis of individual feedstock showed that the increase of double bonds in C6 hydrocarbons could enhance the production of aromatic hydrocarbons, while the conversion of guaiacol to aromatic hydrocarbons occurred following the pathways as: guaiacol→catechol→phenol&cresol→BTX (benzene, toluene, and xylene). Analyzing the evolution of major intermediates and products from co-pyrolysis showed that hydrogen transfer from C6 hydrocarbon to guaiacol significantly enhanced the conversion of catechol to phenol/cresol and subsequent hydrodeoxygenation to BTX. Hexadiene showed the strongest synergistic effects with guaiacol, as abundant hydrogen was generated from aromatization reaction and then transferred. Fitting the evolution curves with 1st order catalyst deactivation kinetics model indicated that the decay factors calculated based on the yield changes of BTX and typical phenolic products were significantly lower with co-pyrolysis. The synergistic effects to mitigate catalyst deactivation and coke formation were further confirmed by characterizations of spent catalysts, catalytic coke and coke precursors, strength of which followed the order as hexadiene (16.7%) > hexene (13.0%) > n-hexane (8.5%). These experimental observations were further corroborated by ReaxFF MD simulations, which provide complementary evidence for hydrogen-transfer interactions.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2026
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IF 6.5
Liang Feng,Xiaohua Li,Shanshan Shao
This study aims to achieve the high-value utilization of waste plastics via catalytic pyrolysis by developing a biomass-derived porous carbon catalyst prepared from corn cob through phosphoric acid activation, which enables the targeted conversion of low-density polyethylene (LDPE) into hydrocarbons within the jet fuel range. A series of catalysts with distinct pore structures and surface acid properties were obtained by systematically regulating preparation parameters, including carbonization temperature and phosphoric acid impregnation ratio. The catalytic performance was evaluated in a fixed-bed reactor, and the effects of preparation conditions and reaction parameters on the distribution of gaseous, liquid, and solid products, as well as on liquid product selectivity, were systematically investigated. The results reveal a pronounced synergistic effect between the pore structure and acid properties of the catalyst, among which BDAPC-600-0.6, featuring a high acid density, abundant medium-strength acid sites, and a micropore fraction of approximately 40%, exhibits the best catalytic performance.This established a clear structure-activity relationship linking synthesis, structure, and performance. Under the optimized conditions of a pyrolysis temperature of 480 °C and a catalyst-to-feed mass ratio of 1, a liquid yield of 67.1 wt % was achieved, with the selectivity toward the target C8–C16 alkanes reaching up to 61.4 area %, while the selectivity toward
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Kuan Shen,Yuqi Chen,Ming Li,Xingmei Guo,Siying Fan,Yafei Zhao,Zhao Xu,Yuanyuan Wang,Qinghong Kong,Junhao Zhang
Non-metallic carbonaceous catalysts for oxygen reduction reaction (ORR) hold great promise for applications in zinc-air batteries (ZABs). Their performance is substantially dictated by the type and quantity of heteroatoms doped within the carbon lattice. Herein, a novel polymerization-pyrolysis strategy is proposed to prepare N, P, S triply doped carbon nanosheets (NPS-C) and regulate the amount of doped atoms. The optimized sample showcases excellent ORR catalytic performance, featuring a half-wave potential of 0.81 V vs. RHE and high long-term stability. When employed as the cathode catalyst in primary ZABs, the resulting battery delivers a high peak power density of 157.9 mW cm −2 , along with high specific capacity and good rate capability. This work provides a simple and effective strategy for developing non-precious carbon-based electrocatalysts, offering new possibilities for enhancing the performance of energy storage and conversion devices.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
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2025
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IF 6.2
Fang Xu,Rui Zhang,Mingjun Liu,Shuang Wu,Da Cui,Jingru Bai,Qing Wang
To address the growing challenges of energy crisis and white pollution, co-pyrolysis of lignin and plastics facilitates both biomass resource valorization and pollution mitigation. To gain deeper insight into the synergistic mechanism, this study combined experiments, kinetic analyses, and molecular simulations to systematically investigate the product distributions and bond-breaking behaviors during lignin/PE co-pyrolysis at multiple scales. The kinetic investigation demonstrated that lignin and PE interaction exhibited a positive synergistic effect, significantly lowering the activation energy. Moreover, adding PE promoted the formation of oxygen-free tar while suppressing oxygen-containing tar, consequently enhancing the fuel properties of pyrolysis tar. In parallel, ReaxFF-MD simulations provided molecular-level insights into the dynamic behaviors of chemical bonds during co-pyrolysis. The results demonstrated that lignin/PE co-pyrolysis facilitated C—C bonds breaking but inhibited C—O bonds cleavage, thereby significantly increasing the production of hydrocarbon gases. TG analysis indicated that the interaction between lignin and PE facilitated the release of volatile products. The simulations complemented experimental observations in the secondary reaction stage, demonstrating synergistic promotion of tar formation while inhibiting pyrolysis gas release. This work elucidated the synergistic mechanism of lignin/PE co-pyrolysis at multiple scales, providing theoretical support for the clean conversion and resource recovery of lignin and plastic waste.
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高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Aojie Li,Qiao Jiang,Tianyi Suo,Liang Chen,Hong Yin,Junlin Huang,Wen-Yuan Xu,Yuan Li,Binhong He,Wei Wang
Non-noble metal single-atom catalysts with high catalytic activity have garnered considerable attention from researchers in recent years. Yet, their synthesis is affected by various factors, making process optimization a challenging and systematic task. In this study, single-atom Fe–N–C porous hollow microspheres were successfully synthesized via ultrasonic spray pyrolysis, with machine learning employed to optimize the fabrication process. Machine learning models, trained on pre-experimental data, identified the key factors influencing material structure and oxygen reduction reaction (ORR) performance. The resulting Fe–N–C (600–900) material demonstrated excellent ORR activity with a half-wave potential of 0.865 V, along with high stability and methanol tolerance. When applied to traditional liquid zinc–air batteries (ZABs), it achieved an open-circuit voltage of 1.56 V and a maximum power density of 313.4 mW cm–2, with a discharge capacity of 806.5 mAh gZn–1 at 10 mA cm–2, outperforming commercial noble metal catalysts. This work offers valuable insights into the application of machine learning for optimizing ORR catalysts and designing high-performance materials for energy conversion devices.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Tong Luo,Mingyang Houding,Cong Luo,Yi Zhang,Xiaoshan Li,Fan Wu,Liqi Zhang
This study presents a dual-fluid atomization spray pyrolysis (SP) synthesis to fabricate porous hollow spherical CaO heat carriers for thermochemical energy storage. Key preparation conditions, including solution concentration, molar ratio of citric acid to Ca 2+ (CA/Ca 2+ ratio), and pyrolysis temperature were systematically analyzed for their effects on cyclic energy storage/release performance, particle size, micromorphology, crystallite size and pore structure via simultaneous thermal analyzer (STA), field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and N 2 isothermal adsorption-desorption methods. Results indicate that higher solution concentrations and CA/Ca 2+ ratios increased particle size and promoted surface grains coalescence. Concentration ≥2 mol∙L −1 or CA/Ca 2+ ratio ≤0.5:1 degraded cyclic performance, and the optimal values are 1 mol∙L −1 and 1:1. Pyrolysis temperature significantly influenced the microstructure by influencing the pyrolysis mechanism: At 400 °C, spray drying dominated, forming hollow spheres with uncoalesced surface grains. At 500–600 °C, mesoporous structure formed with enhanced grain coalescence. At 700–800 °C, violent pyrolysis produced irregular, macroporous particles with high initial but rapidly declining performance. The optimal temperature at 600 °C yielded CaO heat carriers with a high specific surface area of 33.24 m 2 ∙g −1 , achieving 92.8 % initial carbonation conversion and a 30-cycle accumulative energy storage density of 46.13 kJ∙g −1 , which is 2.33 times higher than commercial CaO. Correlation analysis identified the specific surface area, total pore volume, and mesoporous volume fraction as key factors influencing post-cycling carbonation conversion and accumulated energy storage density. This work demonstrates SP synthesis as a scalable approach to tailor CaO microsphere for enhanced thermochemical energy storage.
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高影响因子
GREEN CHEMISTRY
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2025
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IF 9.2
Fengyin Zhou,Beilei Zhang,Hongya Wang,Danfeng Wang,Xin Qu,Shiyu Wang,Mengyi Tang,Ling Peng,Xiang Chen,Dihua Wang,Lawrence Yoon Suk Lee,Huayi Yin
Pyrolysis, thermal reduction, and mechanochemical force are commonly used for biomass utilization, materials synthesis, and spent Li-ion batteries recycling. However, the effect of mechanical treatment on pyrolysis gas generation and thermal reduction remains unclear. Herein, we study the effect of mechanical treatment on the biomass pyrolysis reduction of LiCoO2. The mechanical milling generates oxygen vacancies in the LiCoO2 lattice. In addition, the mechanical treatment can regulate the pyrolysis gas of sawdust in terms of increasing the content of H2, CH4, and CO while decreasing the CO2 content. The oxygen vacancies and pyrolysis gas are beneficial for the thermal collapse of the LiCoO2 structure, leading to the rapid and complete separation of Li and Co, thereby increasing the recovery efficiency to above 98%. The understanding of the interplay of mechanical force, oxide structure, and pyrolysis gas composition helps design green approaches to enabling metal and organic resource recovery and utilization.
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高影响因子
危险品化学品经营许可证（带存储）