POLYMER SCIENCE SERIES B
·
2021
·Vol. 63
·期 4
·358-366
·
IF 1.049
Danbo Mao,Yuechuan Wang
Abstract Four 2,5-dicholorobenzoate monomers were prepared by chlorination and esterification and then polymerized to ester substituted poly( p -phenylene)s through Ni/Zn catalyzed coupling reaction. The thermal stability and pyrolysis behavior of ester substituted poly( p -phenylene)s were investigated through TGA method. The possible mechanism of thermal modification of the polymers was proposed that included de-esterification, dehydration and decarboxylation, and finally de-anhydridization. Only pyrolysis of esters substituted poly( p -phenylene)s containing two neighboring carboxyl groups may result in the formation of the corresponding anhydride.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yang Zhang,Huibin Liu,Shiyang Hu,Wuwan Xiong,Zishan Feng,Yuxing Huang,Bo Zhang,Xiang Li,Fei Li
This study investigates the catalytic pyrolysis of bagasse, a major agricultural waste, for high-yield hydrogen production using metal acetates (Ni, K, Na). An incipient wetness impregnation method was employed to synthesize metal-loaded bagasse, with nickel demonstrating superior catalytic performance. At an optimal loading of 5 wt% Ni, a maximum hydrogen yield of 87.8 mmol/g was achieved at 800 °C, significantly higher than yields from Na and K. The formation of highly dispersed Ni species was evidenced by XRD and SEM-Mapping. FTIR revealed Ni species facilitate selective cleavage of C–H and O–H bonds, and Raman verified Ni promotes ordered carbon rearrangement, favoring highly graphitized carbon. TPO-MS demonstrated the improved hydrogen evolution behavior in the presence of Ni. Soft X-ray absorption spectroscopy at the C K -edge and Ni L -edge further revealed that the highly dispersed Ni species anchored on graphitic carbon matrices served as active sites for hydrogen evolution. The Ni-modified catalyst also significantly improved hydrogen yield during the pyrolysis of other tropical agricultural residues (durian shell and coconut shell), demonstrating broad applicability. The findings establish a sustainable and efficient strategy for hydrogen-rich syngas production from biomass, highlighting the potential of nickel-acetate in enabling low-carbon energy from widespread agro-industrial wastes.
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产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Shiting Chen,Sisi Jia,Nan Xi,Qinglian Wang,Yixiong Lin,Chen Yang,Wang Yin,Ting Qiu
Noble metal catalysts, particularly Ru-based, demonstrate exceptional activity during catalytic hydrotreatment of fast pyrolysis liquids (PLs) from lignocellulosic biomass. However, their high cost poses a major barrier to practical applications. Herein, a series of cost-effective bimetallic Ru-Ni catalysts with varying Ru/Ni ratios (5 wt% metal loading, Ru x Ni y /NC) supported on hierarchical nitrogen-doped carbon materials (NC) were facilely prepared by the wet impregnation method. The performance was evaluated for catalytic hydrotreatment of PLs. The results revealed that the introduction of Ni to Ru significantly enhances catalytic performance. Among the tested catalysts, Ru 4 Ni 1 /NC exhibited optimal activity, achieving the product oils with the highest H/C ratio and lowest thermogravimetric (TG) residue. Under mild condition (200 °C, 6 MPa H 2 , 4 h), the catalyst yielded the product oil with an H/C ratio of 1.49 and a TG residue of 10.7 wt%. When subjected to deep hydrotreatment condition (340 °C, 6 MPa H 2 , 4 h), the catalyst generated the product oil with an H/C ratio of 1.32 and a TG residue of 2.9 wt%. To gain insights into the catalytic mechanism, the adsorption behavior of model components in PLs onto the catalyst was investigated through FT-IR. The results revealed that the incorporation of low electronegativity Ni to Ru, induces the electron transfer from Ni to Ru, resulting in electron enrichment at Ru sites and electron deficient at Ni sites, which promotes the adsorption of substrates onto the catalyst, thereby boosting hydrogenation of PLs. These findings highlight the significant potential of bimetallic Ru-Ni/NC for catalytic hydrotreatment of PLs into intermediates that can be co-processed with vacuum gas oil in FCC refinery for biofuel production.
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Maolin Xu,Chengyang Cao,Hongyun Hu,Yang Ren,Guangzhao Guo,Lifang Gong,Junwei Zhang,Tong Zhang,Hong Yao
With the massive production and discard of PVC artificial leather, it is urgently needed to find an efficient and environment-friendly method to dispose of this material made from PVC and blended cloth (BC). As a widely accepted way to dispose of municipal solid waste, pyrolysis was chosen for this study. The pyrolysis experiments of PVC, BC, and their mixture were conducted to characterize PVC artificial leather’s pyrolysis behavior and product characteristics. TG-FTIR and kinetics analysis showed the strong synergistic effect between PVC and cellulose in BC occurred at 240 °C – 314 °C, resulting in cellulose dehydration and aromatization. An exceptionally high tar yield of 54.96 wt% was obtained by fast pyrolysis of the mixture at 500 °C. GC–MS analysis of tar proved BC consisted of cellulose, PET, and PA. The high tar yield of co-pyrolysis came from the synergistic effects of PVC on cellulose and PET, both of which formed terephthalic acid, di(2-chloroethyl) ester (TADE). At 500 °C, the tar of the mixture mainly contained TADE (18.72 wt%), terephthalic acid (18.56 wt%), and aromatics (19.04 wt%). The co-pyrolysis interaction mechanism at 500 °C was deduced. Our study could provide theoretical guidance for recycling PVC artificial leather waste.
研究领域:
环境科学
·
化学工程
·
材料科学
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DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2022
·
IF 6.535
Xing Yuan,Chaohe Zheng,Zuwei Xu,Qinghua Yang,Tiantian Zhang,Xi Luo,Haibo Zhao
Photothermocatalytic oxidation is an environmentally-friendly, low-temperature, and high-efficient method to remove the air pollutant. Yet, the lack of active, inexpensive, and superior stability catalysts has greatly limited its extensive utilization. In this work, the effect of single-atom Pt loading on TiO 2 support has been theoretically and experimentally studied to improve photothermocatalytic performance for the toluene combustion through flame spray pyrolysis (FSP). Pt loading can play two crucial roles into TiO 2 optimization: (1) The low-valence Pt cation incorporated into TiO 2 lattice is dramatically responsible for the anatase-rutile transformation (ART) and formation of sufficient oxygen vacancies ; (2) Introducing the defect energy level and Pt-3d orbitals remarkably promote the charge separation efficiency of single-atom catalysts. Moreover, the existence of single-atom Pt nanoparticles can signally boost the activity of surface adsorbed and lattice oxygen, as well as substantially reduce the oxygen vacancy formation energy. Thus, the toluene removal under light irradiation reaches 90% conversion below 160 °C and is maximally 18 °C lower than that under only thermocatalytic oxidation. It is attributed to larger specific surface area (SSA), outstanding low-temperature reducibility, extremely dispersed hybrid PtO x , more surface active oxygen, and higher mobility of bulk oxygen. Interestingly, when the oxygen-fuel equivalent ratio φ distinctly increases by shifting precursor solvent from xylene to ethanol, the photothermocatalytic property of toluene can be remarkably enhanced on single-atom Pt catalysts. It is due to the higher Pt dispersion resulting from more intense burning and drastic turbulent mixing, as well as the superior ratio of the metallic Pt active sites originating from higher flame temperature. Eventually, the rate-determining step of C 7 H 8 combustion on Pt/TiO 2 and Cu/TiO 2 slab are all the C C bond fracture of maleic anhydride to form acetic anhydride species, with the energy barriers of 112.03 and 188.74 kJ/mol, respectively.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·854
·
IF 3.444
Jian Li,Xiangyu Li,Derun Hua,Xinning Lu,Yujue Wang
A series of gallium-containing MFI (Ga-MFI) zeolites with varying Ga2O3/Al2O3ratios were synthesized using hydrothermal synthesis and tested as catalyst in catalytic fast pyrolysis (CFP) of beech wood for aromatic production. The results show that the incorporation of Ga slightly reduced the effective pore size of Ga-MFI zeolites compared to conventional HZSM-5 zeolites. Therefore, the Ga-MFI zeolites increased the aromatic selectivity for smaller aromatics such as benzene, toluene, andp-xylene and decreased the aromatic selectivity for bulkier ones such asm-xylene,o-xylene, and polyaromatics in CFP of beech wood relative to HSZM-5. In particular, the yield and selectivity ofp-xylene, the most desired product from CFP of biomass, increased considerably from 1.64 C% and 33.3% for conventional HZSM-5 to 2.98–3.34 C% and 72.1–79.6% for the synthesized Ga-MFI zeolites. These results suggest that slightly reducing the pore size of MFI zeolite by Ga incorporation has a beneficial effect on optimizing the aromatic selectivity toward more valuable monoaromatic products, especiallyp-xylene, during CFP of biomass.Keywords:aromatics;biomass;MFI zeolites;gallium;catalytic fast pyrolysis
研究领域:
能源化学
·
材料科学
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Tiankai Zhang,Qi Wang,Xuemei Lv,Yunhuan Luo,Yongfa Zhang
Although the synthesis of carbon nanotubes from coal can efficiently reduce the cost of preparing these materials, the effect of the primary minerals present in coal (e.g., Fe-containing siderite) on the growth of these structures has not been studied in depth. In this study, we used a bituminous coal containing siderite and investigated the changes of the original siderite phase and the growth mechanism of carbon nanotubes during a KOH-catalyzed coal pyrolysis process . The results shown that the primary Fe minerals played an important role in the formation of carbon nanotubes during coal pyrolysis. During the KOH-catalyzed pyrolysis of coal, the Fe present in the raw material migrated from the bulk to the surface of the coal particles, and enriched in some areas of the surface of the coal particle. KOH-catalyzed coal pyrolysis had a significant effect on the formation of micropores and the increase of specific surface area and pore volume in coal. The primary siderite in coal and the catalytic growth of carbon nanotubes, in line with the following mechanism: FeCO 3 → α-Fe → Fe 3 C + Graphite → carbon nanotubes. This study can provide new ideas for the utilization of low-rank coal resources rich in Fe mineral components.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2026
·
IF 7.7
Muzi Li,Ranbin Liu,Xiaodi Hao,Dongye Zhao,Xi Cheng,Jian Pan,Tianyuan Xu,Shuting Tian,Yangmo Zhu
Perfluoroocatane sulfonate (PFOS) has drawn increasing global attention due to its environmental omnipresence and adverse health effects. This study presents a synergistic strategy to address the dual challenge of legacy PFOS contamination and sustainable sewage sludge disposal by developing a novel, zinc-modified sludge-based biochar (Zn/SBC) for highly efficient PFOS removal. The innovation lies in the one-step pyrolysis using ZnCl 2 as an activator, which dramatically enhanced the specific surface area by 50-fold (to 261.33 m 2 /g) by creating a well-developed micro- and mesoporous structure. Under optimized conditions, 26%Zn/SBC exhibited a superior PFOS adsorption capacity of 60.14 mg/g, 5.83 times than that of pristine biochar, and achieved >99% removal across a wide pH range (3–11). The material exhibited remarkably stable performance, sustaining a removal efficiency over 93.6% in the presence of high concentration of competing ions and humic acid. After 5 cycles of repeated uses, 26%Zn/SBC remained highly reactive in adsorption for PFOS. In addition, the superior adsorption of PFOS by optimized 26%Zn/SBC is attributed to a unique concurrent mechanism, including electrostatic attraction facilitated by the elevated point of zero charge (pH PZC = 8.1), surface complexation with Zn/ZnO sites, π-anion interaction, and hydrophobic effects. This study not only presents a high-performance and low-cost adsorbent for PFOS remediation, which holds the potential for more cost-effective PFAS removal, but also establishes a sustainable "waste-to-wealth" strategy, paving the way for practical solutions to concentration persistent organic pollutants in aquatic environments.
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Kaijie Wei,Xiaoya Feng,Hao Jiang,Chunzhong Li,Yanjie Hu
In recent years, the development of heat-resistant silicone rubber has been a research hotspot. In this paper, a kind of Fe doped TiO 2 nanoparticles (Fe-TiO 2 ) was prepared via flame spray pyrolysis, which can significantly improve the high temperature resistance of silicone rubber. The results show that, on the one hand, the prepared Fe-TiO 2 can inhibit the breakage of Si-O main chain; on the other hand, because Fe is doped into the lattice of TiO 2 , it causes the change of TiO 2 crystal phase and produces more oxygen vacancies, which is more beneficial to capture free radicals in silicone rubber matrix, so that Fe-TiO 2 can effectively inhibit the excessive cross-linking of silicone chain caused by methyl oxidation on the side of silicone rubber. TGA results showed that after adding Fe-TiO 2 , the 5 % thermal weight loss temperature of methyl vinyl silicone rubber increased from 392.8 °C to 435.6 °C.
研究领域:
材料科学
·
高分子化学
·
纳米技术
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DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 6
·1262-1268
·
IF 1.6
Ding Jie,Li Yan,Shi Minxian,Huang Zhixiong,Qin Yan,Zhuang Yingluo,Wang Cunku
The composites were prepared by modifying silicon carbide fiber with particles of zirconium carbide (ZrC) and boron carbide (B 4 C) and incorporating them into a phenolic resin matrix. The influence of ZrC and B 4 C on the mechanical performance of SiC f /phenolic composites after high-temperature pyrolysis was studied through flexural performance test. The results show that the composite material has good thermal stability and high-temperature mechanical properties. After static ablation at 1 400 °C for 15 minutes, the flexural strength of the composite material reaches 286 MPa, which is still 7.3% higher than at room temperature, indicating that the composite material still has good mechanical properties even after heat treatment at 1 400 °C.
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DOI
高影响因子
BioEnergy Research
·
2015
·Vol. 8
·期 3
·1263-1274
·
IF 3.541
Zhang Zhi-bo,Lu Qiang,Ye Xiao-ning,Wang Ti-peng,Wang Xian-hua,Dong Chang-qing
Solid phosphoric acid (SPA) catalysts with different carriers were prepared and used for catalytic fast pyrolysis of poplar wood to produce levoglucosenone (LGO), a valuable anhydrosugar derivative that can be used in various organic synthesis applications. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to evaluate the catalytic capabilities of these catalysts under different reaction conditions. The results indicated that SPA catalyst prepared with the SBA-15 carrier exhibited the best catalytic capability for selectively producing LGO. Both the catalytic pyrolysis temperature and catalyst-to-biomass ratio affected the pyrolytic products greatly. The maximal LGO yield reached as high as 8.2 wt% from poplar wood, obtained at the pyrolysis temperature of 300 °C and the catalyst-to-biomass ratio of 1. The by-products during the catalytic pyrolysis process were mainly acetic acid (AA) and furfural (FF). In addition, the SPA catalyst possessed better catalytic capability than the liquid phosphoric acid (H 3 PO 4 ) catalyst to produce LGO.
研究领域:
生物能源
·
催化化学
·
生物质转化
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热解化学
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绿色化学
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可再生资源利用
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2018
·
IF 3.468
Gongxin Dai,Shurong Wang,Shuqiong Huang,Qun Zou
The catalytic pyrolysis of biomass is a promising technology for producing high-quality fuels and value-added chemicals. However, the development of this technology has been hindered by high coke formation and low target product yield. In this study, chemical liquid deposition (CLD) was adopted to improve the catalytic performance of HZSM-5 in the catalytic pyrolysis of biomass. The changes of the characteristics, including crystallographic structure, porosity and acidity, of the HZSM-5 zeolite after modification were analyzed by XRD, N 2 adsorption-desorption, FTIR and NH 3 -TPD. The results showed that CLD modification reduced the mesopore volume, pore opening size and the number of external acid sites without changing the micropore structure. Py-GC/MS (a pyrolyzer equipped with a gas chromatography-mass spectrometer) and kinetic analysis were used to analyze the catalytic performance of the parent and CLD-modified zeolites. It was found that the production of aromatics increased first and later decreased, reaching optimal levels at a 4% deposition of SiO 2 , while the selectivity of monoaromatics increased continuously. Additionally, CLD modification raised the energy barriers for the char/coke formation reactions and could inhibit its production. The deposition amount of 4% showed the best char/coke inhibitory effects for catalytic pyrolysis of cellulose, while the char/coke formation decreased continuously with the increase of the deposited amount of SiO 2 for catalytic pyrolysis of lignin.
研究领域:
催化化学
·
生物能源
·
材料科学
·
化学工程
·
可再生能源
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DOI
高影响因子
危险品化学品经营许可证（带存储）