JOURNAL OF THE ENERGY INSTITUTE
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2020
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IF 4.748
Fang-Jing Liu,Jia-Pei Guo,Guang-Hui Liu,Lei-Lei Bie,Yun-Peng Zhao,Zai-Xing Huang,Xian-Yong Wei
Lignites are promising candidates as feedstocks for producing chemicals rather than used as solid fuels. Herein, a mesoporous silica-coated Fe 3 O 4 supported magnetic solid base (MSB) was prepared for catalytic hydrocracking (CHC) of Xiaolongtan lignite (XL). The effect of reaction temperature on aromatic production through CHC was investigated. The results showed that the MSB with abundant mesoporous structures has strong basic sites and superparamagnetism, which can effectively enhance producing soluble portions and aromatics from hydrocracking of XL. Both the yields of the soluble portions and aromatics from CHC of XL increased with raising reaction temperature. The maximum yield of the soluble portions reached 78 wt% at 300 °C from CHC. Phenols are the main group component from CHC of XL at 300 °C, which could be mainly generated from the cleavage of C–O bridged bonds in XL. Both the yields of phenols and arenes from CHC at 300 °C are twice more than those from CHC. It was proposed that the MSB could catalyze splitting H 2 to release active H − and facilitate H − transfer to cleave the C–O bridged bonds, resulting in producing higher yields of aromatics.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
·
IF 4.192
Yafu Tang,Shanmin Hou,Yuechao Yang,Dongdong Cheng,Bin Gao,Yongshan Wan,Yuncong C. Li,Yuanyuan Yao,Shugang Zhang,Jiazhuo Xie
Although solid-phase activation of lignite using a nanocatalyst has great potential in producing low-cost and sustainable humic acid, the large-scale application of this technology still faces challenges because of the high price and toxicity of the nanocatalyst. Additionally, the specific molecular components of humic acid in activated lignite remain unknown. In this work, a multifunctional molybdate-phosphorus hierarchical hollow nanosphere (Mo-P-HH) catalyst was successfully manufactured by a simple way followed by phosphorization. In comparison with a commercial Pd/C catalyst, the multifunctional Mo-P-HH catalyst was more effective in producing water-soluble humic acid with small molecular functional groups from lignite via solid-phase activation. Moreover, Fourier transform ion cyclotron resonance mass spectrometry revealed the molecular compositions of humic acid in activated lignite. Compared with that from raw lignite, the humic acid after Mo-P-HH activation had less aromatic structure but higher content of lipids, proteins, amino sugar, and carbohydrates. In addition, the activated humic acid simulated seed germination and seedling growth. Therefore, this study provided a high-performance hierarchical hollow nanocatalyst for activation of humic acid and also offered the theoretical basis for the application of humic acid in agriculture.
研究领域:
环境科学
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农业科学
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DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Guang-Hui Liu,Yong-Chao Qi,Han Wang,Ai-Min Wang,Yu-Hong Kang,Yong Gao,Ni Bai,Zhan-Ku Li,Xian-Yong Wei
This paper focused on the complementary advantages of density functional theory (DFT) calculation and catalytic reaction regulation. Based on the effective identification of intermediates, the possible catalytic hydroconversion (CHC) pathways of lignite-derived aryl ethers over Ni/mordenite were discussed. Bond dissociation energy (BDE) calculations of >C–O– bonds in different substrates and intermediates show that BDEs of >C ar –O– bonds are generally higher than those of >C al –O– bonds, and there is obvious electron aggregation near O atoms. Mulliken charge distribution analyses of different atomic sites further revealed the possible adsorption sites of active hydrogen, especially H · and H + . Possible cleavage pathways were further speculated by evaluating the stability of different leaving groups. In the early stage of CHC, aromatic ring hydrogenation and >C al –O– bond cleavage dominate, rather than >C ar –O– bond cleavage. Enthalpy change analyses combined with the CHC of real substrates further indicate that lowering temperature is beneficial to the cleavage of >C ar –O– bonds under the premise of inhibiting H ··· H transfer and obtaining H · effectively. Appropriately increasing the support acidity to ensure sufficient H + release is conducive to >C al –O– bond cleavage, especially direct dehydroxylation/dehydration. The analysis of synergetic transfer pathways of active hydrogen during the CHC provides theoretical guidance for the pathway optimization of converting lignite into high-quality clean liquid fuels.
研究领域:
化学工程
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能源科学
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2026
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IF 6.7
Peng Zhang,Xiao-Qi Zhang,Yang-Fan Yin,Jie-Ying Liu,Guang-Hui Liu,Yao-Shun Wen,Yu-Hong Kang,Jun Ma,Yan-Jun Li,Xian-Yong Wei
The trade-off between catalyst morphology regulation and electronic structure of metal centers is crucial for achieving goals of heterogeneous catalysis. In this study, a Ni-based mesopore Y zeolite, Ni@MY, was developed by a combined modification strategy of bond blocking and deposition-precipitation, and used for the hydrofining of ethanol-soluble portion (ESP) derived from Dongming lignite ethanolysis. The results show that Ni@MY has excellent hierarchical pore structures and enhanced acidity. These properties effectively improve the electronic properties of metal active centers and the accessibility of medium/large molecules, thereby significantly enhancing the performance of aromatic ring hydrogenation and heteroatom removal. In addition, the synergistic transfer of active hydrogen, including H ··· H, δ+ H ··· H δ- , H + , and H · can be induced over Ni@MY, which effectively promotes the conversion of different aryl ethers into alkyl cyclanes. Analysis revealed that ESP is rich in alkanes, arenes, phenols, ketones, and esters, with aromatics accounting for up to 69.3%. After hydrofining, the refined oil contained 96.8% saturated hydrocarbons, among which cyclanes accounted for as much as 83.6%. Compared with conventional Ni@Y, Ni@MY has superior suitability for processing complex crude oils derived from lignite liquefaction for producing high-grade liquid fuels.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Hai-Bang Zhang,Zexu Yang,Kaiyuan Qiao,Guixiao Jia,Huazheng Sai,Yunying Liu,Wenxiu He,Jin-Long Cui
Heteroatom doping is a valid strategy for improving the lithium/sodium storage capacity of carbon materials. Here, N-doped hierarchical porous carbon (NHPC) with defects is designed and synthesized via a low-cost and green synthesis method using lignite humic acid extraction residue as the raw material. Through experiments and theoretical calculations, the effects of N-doping and defects on Li + /Na + storage capacity are systematically analyzed. With the introduction of defects and N atoms, electrical conductivity , and Na + adsorption energy of NHPC gain improvement. The porous structure could shorten the Li + /Na + diffusion path and relieve the volume dilation and mechanical strain. Compared with other counterparts, NHPC obtained at 700 °C maintains a bigger reversible capacity of 940 mAh/g at 0.1 A/g in lithium-ion batteries. Even at 1.0 A/g, the specific capacity of NHPC-700 stabilizes at 508 mAh/g with a capacity recession of only 0.021% per cycle after 1000 cycles. In sodium-ion batteries, NHPC-700 anode also exhibits a high specific capacity (320 mAh/g at 0.1 A/g) and good cycling stability (225 mAh/g after 1200 cycles at 1.0 A/g). Here, the entire synthesis route is an eco-friendly process, which achieves zero discharge and zero pollution.
研究领域:
材料科学
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储能技术
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电化学
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可持续化学
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纳米材料
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DOI
高影响因子
Rice Science
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2026
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IF 7.4
Liu Yan,Zhang Yuhan,Bai Yijie,Li Shan,Wang Songyuan,Yao Yuanyuan,Yang Yuechao
Fulvic acid (FA) has been widely used as a plant growth regulator to alleviate salt stress. However, the mechanism by which it enhances salt tolerance in rice remains unclear. This study systematically investigated the chemical structure of FA and its role in enhancing rice salt tolerance through the regulation of plasma membrane (PM) H + -ATPase. The results demonstrated that the increased molecular weight (MW) of FA companied by progressive aromaticity enhancement and functional group depletion. Principal component analysis revealed that low-MW FA fractions (< 3 kDa), enriched in carboxylic-C, phenolic-C, and lignin-like substances, exhibited a strong positive correlation with root growth, membrane potential (MP) hyperpolarization, and Na + efflux under 100 mmol/L NaCl stress. Mechanistically, FA directly activated PM H + -ATPase (activity increased by 30.3%‒86.2%), generating a proton gradient that energized SOS1 to mediate Na + efflux, leading to salt tolerance in rice. Genetic validation using osa1 knockout mutants confirmed the indispensable role of PM H + -ATPase in FA-induced responses, as both MP and Na + efflux remained unaltered upon FA1‒FA5 treatment. This research found that FA fractions with high functional group density and low aromaticity can serve as optimal plant biostimulants for salt stress mitigation, providing a new strategy for sustainable lignite valorization in precision agriculture.
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 98
·期 9
·2122-2135
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IF 3.4
Chong Liang,Wei Zhao,Mingyu Cui,Dingkai Wang,Xutang Liu,Linyang Dong,Xianyong Wei
BACKGROUND In view of the low economic benefit for direct utilization of lignite, the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) has been used to extract Inner Mongolia lignite (IML) in order to efficiently separate lignite, develop the technology for clean and value-added utilization of lignite, and alleviate the enormous pressure of ecological environment pollution. Subsequently, sequential extraction of IML by [Bmim]Cl/ N -methyl-2-pyrrolidone (NMP), acetonitrile and ether was employed to separate group components in lignite. RESULTS Functional group results show that hydrogen bonds of IML including OH ether, COOH dimers and SH N, and weak covalent bonds such as C al O, C al N, C al S and S S, can be cleaved by [Bmim]Cl. Extraction experiments using mixed solvents of [Bmim]Cl and NMP or water indicate that the synergistic effect of NMP and [Bmim]Cl plays a vital role in increasing lignite extraction yield, but for water an opposite effect is observed. Importantly, the group components extracted by [Bmim]Cl/NMP and consecutively by acetonitrile and ether show a clear difference in composition according to gas chromatography–mass spectrometry. Specifically, polycyclic aromatic hydrocarbons and long-chain alkanes are present in the acetonitrile phase, with relative content of 8% and 88%, respectively, while most of esters, aliphatic acids and phenols are dissolved in ether with proportions of 35.24%, 35.53% and 16.57%, respectively. CONCLUSION This work demonstrates that sequential extraction of lignite by [Bmim]Cl/NMP, acetonitrile and ether may provide new insights for the separation of group components and clean utilization of lignite in industry. © 2023 Society of Chemical Industry (SCI).
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zi-Chun Fan,Zhuang Li,Xiang Bai,Xian-Yong Wei,Yierxiati Dilixiati,Qian-Qian Kong,Ji Zhao,Yong-Hui Feng,Zhi-Min Zong,Jun-Long Wang
The catalytic hydroconversion (CHC) of benzyloxybenzene (BOB) and oxydibenzene (ODB), two typical lignite-related model compounds (LRMCs) representing α-Ο-4 and 4-O-5 model linkages , have been investigated using uniformly dispersed Ni 15 /HY prepared by a three-step method. The cleavage of >CH-O- bridged bonds in BOB and partial hydrogenation of ODB are considered as a crucial first step, and the target reactions in this work are to produce complete hydrodeoxidized ring saturation products. Through the exploration of reaction mechanism, H + /H - and biatomic active hydrogen, as the main hydrogen species involved in the reaction, play an important role in the CHC of BOB and ODB. Herein, the synergic effect between the hydrogenation of nickel nanoparticles and the acidic function of Y -type zeolite improves the CHC performance, resulting in Ni 15 /HY displaying proficient catalytic activity and selectivity for the CHC of BOB and ODB. Under the optimal reaction conditions, BOB and ODB can be completely converted to cyclanes over Ni 15 /HY, and the main products are dicyclohexylmethane (57.6 %) and cyclohexane (92.4 %), respectively. The developed Ni 15 /HY can not only promote the hydroconversion of BOB and ODB to produce ring-saturated products, but also undergo the rearrangement reaction to produce two- or three-ring cyclanes, which is desirable to upgrade LRMCs to high-density hydrocarbon fuels .
研究领域:
化学工程
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燃料化学
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaofang Zhang,Yuhuan Li,Yang He,Debin Kong,Bern Klein,Shenghua Yin,Hongyu Zhao
Activated carbon plays an important role in the field of wastewater treatment due to its excellent adsorption, but improving the recovery and utilization efficiency of activated carbon is a major challenge for its application. In this study, lignite (LC) and poplar leaves (PL) were used as raw materials to prepare magnetic activated carbon (MAC) by co-pyrolysis and char activation modification. The adsorption performance of the product was studied. The results showed that with different blending ratios of LC and PL, a large amount of alkali metal oxides contained in PL had different promoting effects on the pyrolysis of LC. When the mass ratio of LC to PL in the mixture was 3:2, the experimental value of hydrocarbons in the obtained tar reached 53.00%, which was 7.20% higher than the calculated value. The optimal preparation conditions of MAC were determined. Under the conditions of activation temperature of 700 °C, activation time of 2 h, ZnCl 2 mass fraction of 30%, impregnation liquid–solid ratio of 3:1 and impregnation time of 16 h, the activated carbon exhibits a relatively desirable performance. The obtained products were characterized by VSM, XRD, FT-IR, N 2 adsorption and SEM. As a result, the obtained MAC exhibits a better porous structure and higher specific surface area, and Fe 3 O 4 was observed on the surface of the MAC. The adsorption performance of coking wastewater by MAC was studied. We demonstrate that the prepared MAC could effectively adsorb organic matter in wastewater. After MAC was used to adsorb the coking wastewater for 3 h, the COD concentration in the wastewater decreased from 280 to 60 mg/L, and the MAC could be effectively recovered by magnets after adsorption.
研究领域:
能源与环境科学
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材料科学
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DOI
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 18
·e05978
·
IF 2.3
Mei-Xia Zhao,Fang-Jing Liu,Zhi Yang,Ning Yang
Catalytic hydrocracking of lignite through cleaving C─O bridged bonds is a promising approach for producing aromatics. Herein, a nitrogen-doped carbon-supported Fe catalyst (Fe/NC) was prepared through a co-pyrolysis method and used for the CHC of benzyl phenyl ether and Xilinguole lignite. Fe/NC carbonized at 800°C with 4% Fe exhibited good activity for selectively converting benzyl phenyl ether into toluene and phenol at 250 °C and 1 MPa H 2 . The effects of reaction temperature, reaction time, initial hydrogen pressure, and solvent on the yields of products and the molecular compositions of the oils from catalytic hydrocracking of the lignite were investigated. The results showed that total product yield reached 29.1 wt% with an oil yield of 13.7 wt% under the optimal reaction conditions at 325 °C, 1 MPa, and 6 h. The group components in the oils were dominated by aromatic compounds with relative content higher than 90% by using alcohols as the solvents. Phenols accounted for more than 50% of the relative content among the aromatic compounds in most cases. The possible pathways for lignite hydrocracking over Fe/NC induced by H∙were proposed. This study proposed a possible approach for producing aromatics through mild hydrocracking from lignite. Graphical The effects of reaction conditions on the molecular compositions of the oils from catalytic hydrocracking of a lignite over a Fe/NC catalyst were evaluated and the group components in the oils were dominated by aromatic compounds, among which phenols accounted for more than 50%.
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高影响因子
Minerals
·
2022
·Vol. 12
·期 6
·665
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IF 2.818
Xiaofang Zhang,Yuhuan Li,Yang He,Debin Kong,Bern Klein,Shenghua Yin,Hongyu Zhao
Adsorption with activated carbon (AC) is an important method for the treatment of heavy metal wastewater, but there are still certain challenges in the separation and reuse of activated carbon. The preparation of magnetic activated carbon (MAC) by modifying AC is one of the effective means to realize the separation of AC from solution after the adsorption process. In this work, lignite and poplar leaves were used as raw materials for co-pyrolysis, and the co-pyrolysis char was activated and modified to prepare MAC. The structure and properties were characterized by VSM, N2adsorption, SEM, XRD, and FT-IR. At the same time, the adsorption performance of MAC on wastewater containing Pb and Cd ions was studied. The results show that the prepared MAC contains Fe3O4, and the saturation magnetization (Ms) of the MAC is 13.83 emu/g; the specific surface area of the MAC is 805.86 m2/g, and the micropore volume is 0.23 cm3/g; the MAC exhibited a good porous structure. When the pH value of the solution was 5, the adsorption time was 120 min, the dosage of MAC was 4 g/L, the initial concentration of Pb ion solution was 50 mg/L, and that of Cd ion solution was 25 mg/L, and the adsorption temperature was 30 °C, the adsorption efficiency of Pb, Cd ions were 84.40 and 78.80%, respectively, and the adsorption capacities were 10.55 and 4.93 mg/g, respectively. The adsorption of Pb and Cd ions by MAC conforms to the Langmuir adsorption model, which is a monolayer adsorption. The adsorption process is mainly chemical adsorption, which can be better described by the pseudo-second-order model. The adsorption thermodynamic analysis showed that the adsorption of Pb and Cd ions by MAC was a spontaneous reaction, and the higher the temperature, the stronger the spontaneity.Keywords:lignite;poplar leaves;magnetic activated carbon;heavy metal ions;adsorption mechanism
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）