POWDER TECHNOLOGY
·
2026
·
IF 5.5
Shi-Peng Deng,Xue-Fei Peng,Hong-Lei Yan,Zhan-Ku Li,Jing-Chong Yan,Wei-Dong Zhang,Shi-Biao Ren,Zhi-Cai Wang,Shi-Gang Kang,Heng-Fu Shui,Zhi-Ping Lei
Bio-based 2-MTHF is a green alternative for efficient lignite wax extraction. • 2-MTHF achieved 7.9 wt% yield, a 58% increase over toluene extraction. • Crude wax yield reached 5.3%, approaching China's National Grade II standard. • Low activation energy (9.02 kJ·mol −1 ) confirms efficient matrix disruption. Lignite, which is rich in high-value montan wax, is currently mostly burned directly, resulting in a waste of resources. At the same time, traditional toluene extraction methods are facing increasingly stringent regulations due to their toxicity and environmental risks, which hinders the efficient utilization of resources and the adoption of environmentally preferable production routes. This study proposes the bio-based solvent 2-methyl tetrahydrofuran (2-MTHF) as a greener and more efficient alternative to toluene. 2-MTHF can effectively penetrate the pores of the lignite matrix, disrupting non-covalent interactions (such as hydrogen bonds) between wax molecules and the coal matrix, thereby achieving selective and efficient dissolution. Under mild conditions (140 °C, 60 min, solid-to-liquid ratio 1:10, particle size 0.15–0.25 mm), the 2-MTHF extract rate reached 7.9 wt%, a 58% increase compared to toluene (5.0 wt%) under the same conditions; the defatted montan wax yield was 5.3%, also higher than that of toluene (3.3%) (an increase of approximately 61%), and the crude wax product approaches China's National Grade II standard, with a resin content of 33.3% slightly above the 27% limit, while its acid value and saponification value comply with the Grade II requirements. Kinetics and mass transfer analysis indicated that the process follows a first-order kinetic model, with an apparent activation energy of only 9.02 kJ·mol −1 , and is controlled by intraparticle diffusion, further confirming that 2-MTHF can effectively weaken non-covalent interactions within lignite and promote the selective leaching of wax. Download: Download high-res image (128KB) Download: Download full-size image
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Wei Deng,Wei Yang,Linjing Hao,Daoguang Teng,Guixia Fan,Baolin Xing,Hongyan Nan,Peng Li,Yijun Cao
Ammonolysis atmosphere dictates N configuration beyond total N content. • N 2 atmosphere enriches active N-6/N-5 species while suppressing inert N-X species. • Stepwise synergy of N-engineering and KOH etching unlocks hierarchical pores. • Hierarchical porosity and active N species synergistically boost capacitance. Transforming low-grade lignite into functional carbon materials for energy storage is challenging because it is difficult to simultaneously achieve high nitrogen doping efficiency, well-developed porosity, and favorable nitrogen configurations. Here, we investigate the atmosphere-dependent mechanism of ammonolysis under N 2 , air, and O 2 and its synergistic coupling with subsequent carbonization and KOH activation for the preparation of nitrogen-doped porous carbon from Zhaotong lignite. Although O2 and air atmospheres produce higher total nitrogen contents, N 2 ammonolysis preferentially preserves electrochemically active N-6 and N-5 species, with relative contents of 19.64% and 20.64%, respectively, while suppressing the formation of electrochemically inactive N-X species to 6.22%. This chemical preconditioning is retained during carbonization and amplified by KOH activation, which exposes nitrogen sites, removes mineral impurities, and generates a hierarchical pore network containing ultra-micropores, micropores, mesopores, and macropores. The resulting KCZR N exhibits a high defect density ( I D /I G = 1.0094), a specific surface area of 1003.8 m 2 /g, and abundant N-6/N-5 active sites. Consequently, the KCZR N electrode delivers a specific capacitance of 340.5 F/g at 0.5 A/g in a three-electrode system, with a rate capability of 55.3% retention and a cycling stability of 85.9% after 10,000 cycles. A symmetric supercapacitor assembled with KCZR N achieves an energy density of 12.1 Wh/kg at 249.9 W/kg. This work demonstrates the coupled effect between ammonolysis atmosphere and KOH activation, and provides a strategy for upgrading low-grade lignite into carbon electrodes for energy storage applications. Download: Download high-res image (673KB) Download: Download full-size image
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高影响因子
ACS Omega
·
2020
·
IF 2.87
Lulu Yan,Yahe Zhang,Hongyu Yan,Yu Fan,Xuxia Liu,Chao Ma,Quan Shi
A lignite was subjected to sequential solvent extraction via continuously reducing particle size from around 20 to more than 200 mesh. Five sets of n-hexane and methanol extracts from the particles were characterized by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) and gas chromatography–mass spectrometry. The total extract yield for lignite when using hexane and methanol as solvents could reach to 0.98 and 15.12%, respectively. The results showed that more molecules with a similar structure but different composition could be extracted by continuously reducing the particle size of the residues, indicating the nonuniform distribution of the low-solubility molecules trapped in the coal particles. The extracts were abundant in branched long-chain aliphatic moieties and oxygen-containing compounds. With the increasing of the extraction degree, the content of alkanes in the extracts decreased rapidly. On the contrary, the content of the compounds with higher condensation and more oxygen atoms increased. It should be noted that polycyclic aromatic hydrocarbons were almost steadily present in all the extraction steps. The molecular composition and distribution of organic molecules in the lignite provide clues to the understanding of coal structure, which is significant for the environmental emission and development of processing techniques for the clean and high value-added utilizations of such a low-rank and abundant coal resource.
研究领域:
化学
·
环境科学
·
能源资源
·
材料科学
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DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Min Zhang,Xian-Yong Wei,Zheng Yang,Dao-Guang Teng,Yan Xue,De-Wu Meng,Zhi-Min Zong
A highly active magnetic solid superbase (MSSB) was prepared by impregnating Mg 2 Si onto γ-Al 2 O 3 -coated ferroferric oxide nanoparticles via one-pot synthesis method and successfully applied in the catalytic hydroconversion (CHC) of the extraction residue (ER) from Naomaohu lignite. Large amounts of chain alkanes and arenes were detected in the soluble portion (SP) from the non-catalytic hydroconversion of the ER, while oxygen-containing organic compounds are predominant in the SP from the CHC of the ER, indicating that MSSB catalyzes the cleavage of C O bridged bonds in the ER. Oxybis(methylene)dibenzene was used as the lignite-related model compound to evaluate the catalytic activity of MSSB. The results show that MSSB facilitates heterolytically splitting H 2 to release H − and subsequent H − transfer, leading to the cleavage of C O bridged bonds.
研究领域:
化学工程
·
能源科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Mengqi Zheng,Chunyan Xu,Dan Zhong,Yuxing Han,Zhengwen Zhang,Hao Zhu,Hongjun Han
In current study, the degradation of aromatic cyclic organics (ACOs) of coal pyrolysis wastewater (CPW) by lignite activated coke-active sludge (LAC-AS) process was investigated through the insight into synergistic effect of LAC and microbial community. As a contrast, the study on single AS process revealed that high phenols (>200 mg·L −1 ) exerted irreversible toxicity by eliminating biomass. Meanwhile, quinoline and naphthalene exhibited joint inhibition with phenols on bio-community. Absence of functional genus and insufficient interspecific cooperation caused interrupted biological reaction, leading to degenerated ecosystem and vicious circle. However, LAC-AS performed synergistic degradation of ACOs, leading to developed ecosystems and benign substance metabolisms. Specifically, LAC alleviated toxicity on suspended AS by ACOs adsorption, and the facultative bacteria enriched by LAC exerted synergistic degradation in biochemical processes. Firstly, the bacteria on biofilm facilitated direct interspecies electron transfer for ring-cleavage reaction, and electroactive bacteria ( Cloacibacterium , Hydrogenophaga and Stenotrophomonas ) were critical for the process. Secondly, suspended AS further degraded ring-cleavage products, achieving the interspecific cooperation with biofilm. The synergistic nitrogen metabolism by different paths also contributed to the benign metabolic circulation.
研究领域:
环境工程
·
水处理
·
微生物学
·
生物技术
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DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Guang-Hui Liu,Zhi-Min Zong,Fang-Jing Liu,Zhi-Hao Ma,Xian-Yong Wei,Yu-Hong Kang,Xing Fan,Feng-Yun Ma,Jing-Mei Liu,Wen-Long Mo
A biochar (BC)-supported non-noble metal catalyst CoMoSxOy@BC was prepared by in situ co-pyrolysis and ex situ sulfurization, and a two-step conversion (TSC) strategy, including H2-controlled catalytic hydroconversion (CHC) and catalytic ethanolysis without H2 participation, was proposed and used for catalyzing degradation of Dahuangshan lignite (DL) into soluble species (SSs) in high yields. CoMoSxOy@BC with uniformly dispersed nanoparticles of metals, metal sulfides, and metal oxides plays a crucial role in the TSC. The effective activation of H2 and ethanol over CoMoSxOy@BC facilitates cleaving bridged linkages in organic matter of DL to increase the SS yields. As a result, the total yield of SSs increased from 42.7% via non-catalytic degradation (NCD) to 70.0% via catalytic degradation (CD), while that of the petroleum ether-extractable portion (PEEP) increases from 17.5% via NCD to 27.0% via CD. In addition, according to the analysis with a gas chromatograph/mass spectrometer, alkanes, arenes, and arenols are dominant in PEEPs from step 1 (PEEPs1), while alkanol, arenols, and esters in PEEPs from step 2 (PEEPs2) are predominant. The difference in composition among the PEEPs and hydrogenated PEEPs obtained by the CHC further confirms that PEEPs1 are more suitable as a precursor for the fuel-platform unit, while PEEPs2 are better candidates for obtaining value-added chemicals. In other words, multiple PEEPs in high yields with different properties can be obtained by this TSC strategy, which provides a potential and promising alternative to the clean and efficient utilization of lignites.
研究领域:
化学工程
·
能源科学
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DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Juan-Juan Zheng,Fang-Jing Liu,Bing-Kang Sun,Yan-Hong Li,Bo Meng,Yan-Ming Yu,Yun-Peng Zhao,Jing-Pei Cao,Xian-Yong Wei,Yao Lu,Hai-Yun Lu
Conversion of organic matter in lignite into chemicals and high-performance carbon materials is a promising approach for clean and efficient utilization of lignite. Herein, Shengli lignite (SL) is subjected to supercritical ethanolysis, followed by ultrasonic extraction with isometric carbon disulfide/acetone for separating SL into soluble organic matters (SOMs) and insoluble extraction residue (ER) with highly condensed aromatic structures. According to the analyses with gas chromatography/mass spectrometry (GC/MS) and Orbitrap MS, the SOMs were mainly composed of oxygen-containing compounds, such as arenols, aliphatic esters, and aromatic esters, which can be used as feedstock for producing value-added chemicals. The ER was used as a carbon precursor to produce three-dimensional porous carbon materials (PCMs) through precarbonization and activation with KOH using nano-ZnO as an in situ template. The prepared PCMs possessed high stability, large specific surface area, and abundant oxygen-doped carbon, showing a high specific capacitance of 300 F g–1 at 0.5 A g–1 in a three-electrode system, and the capacitance retention was 100% after 10,000 cycles of charge and discharge at 5 A g–1 in a two-electrode system.
研究领域:
能源化学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Nai-Yu Yao,Jing-Pei Cao,Shi-Jie Cai,Chen-Xu Chen,Xiao-Yan Zhao,Xin-Bo Pang,Min Xu,You Lu,Xiao-Bo Feng,Tungalagtamir Bold
ZSM-5 is an effective catalyst for the catalytic reforming of volatiles from lignite. An increased density of acidic sites significantly enhances catalytic activity. However, its inherent microporous structure and abundant external surface acids lead to issues including catalyst deactivation. In this work, a nondiscriminatory etching method using NH4F was employed to simultaneously remove Si and Al species from highly acidic zeolites. This process introduces mesopores while reducing external surface acidity, maintains high crystallinity, and preserves the total acid content essentially unchanged. The mesoporous surface area of HZ5-6.5 reaches 129 m2/g. This significantly enhances the mass transfer efficiency of volatile component molecules within the zeolite, effectively improving the accessibility of active sites. Furthermore, compared to the parent zeolite, the modified HZ5-6.5 exhibits a 50% reduction in acidic sites on its crystal surface while maintaining essentially unchanged total acidity. Concurrently, light aromatic yields increase, while coke deposition decreases by 40%.
研究领域:
催化化学
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能源化学
·
材料科学
·
化学工程
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DOI
高影响因子
ENERGY & FUELS
·
2026
·Vol. 40
·期 33
·18068-18080
·
IF 6
Fu Zong-Pin,Zhao Yun-Peng,Wu Yu-Fa,Qiu Le-Le,Liu Fang-Jing,Zhong Mei,Liang Jing,Cao Jing-Pei
Efficient depolymerization of lignite remains challenging
owing
to both its structural complexity and the high stability of oxygen-containing
bridge linkages. Herein, low-temperature pyrolysis and oxidative pretreatments
were employed to regulate oxygen-containing structures and enhance
the hydrogenolysis reactivity of Zhaotong lignite (ZT). These pretreatments
promoted the structural evolution of lignite, activated oxygen-containing
bridge structures, and suppressed the recondensation of reactive intermediates,
thereby facilitating subsequent depolymerization reactions. A CuCoOx
catalyst capable of dynamic in situ reconstruction was introduced
for catalytic hydrogenolysis. Under reaction conditions, partial reduction
of CuCoOx generated reconstructed Cu 0 -CoOx interfacial
active sites, where the synergistic interaction between metallic Cu
and defect-rich CoOx promoted H 2 activation and selective
C–O bond cleavage. Density functional theory (DFT) calculations
further revealed that interfacial electron redistribution at the Cu
cluster/Vo-Co 3 O 4 (311) interface facilitated
H 2 activation and stabilized reactive hydrogen species.
These findings provide new mechanistic insights into pretreatment-regulated
and interface-controlled hydrogenolysis pathways for the efficient
valorization of low-rank coal.
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高影响因子
FUEL
·
2021
·
IF 6.609
Kun Zhao,Xiaojie Fang,Zhen Huang,Guoqiang Wei,Anqing Zheng,Zengli Zhao
Chemical looping gasification provides a novel technology to enable clean conversion of coal with inherent CO 2 capture. In this study, four types of NiFe 2 O 4 and CuFe 2 O 4 synthesized by sol–gel method and solid-phase method were used as oxygen carriers to promote the H 2 production from gasification of lignite. The effects of the types of oxygen carrier and oxygen carrier to coal (O/C) ratio on chemical looping gasification of lignite were first investigated by a thermogravimetric analyzer (TGA) combing with various analytical methods. The results show that, among four types of oxygen carrier, the NiFe 2 O 4 synthesized by sol–gel method exhibits the highest gasification reactivity with lignite char at an O/C ratio of 1, since its highly cubic spinel structure is beneficial to improve the mobility of lattice oxygen. Furthermore, the operating conditions for chemical looping gasification of lignite were optimized and the gasification performance of four types oxygen carriers was compared by using a fixed bed reactor. It is found that NiFe 2 O 4 synthesized by sol–gel method exhibits the highest total gas yield of 24.47 mol/kg and H 2 /CO ratio of 0.77 during chemical looping gasification of lignite under the optimal operating conditions, ascribed to Fe-Ni synergistic effect which provided higher gasification reactivity with lignite char. The addition of steam drastically improves the total gas yield and H 2 /CO ratio of syngas from 24.47 mol/kg and 0.77 to 64.98 mol/kg and 2.79, suggesting that the H 2 /CO ratio of syngas can be flexibly adjusted to meet the need of downstream process via controlling the amount of steam added. These findings provide an efficient method to obtain H 2 -rich syngas via chemical looping gasification of lignite.
研究领域:
能源科学
·
材料科学
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DOI
高影响因子
SN Applied Sciences
·
2021
·Vol. 3
·期 1
·1-10
·
IF 0
Li Yaxing,Yuan Shenfu
In this study, humic acids (HAs) were extracted from Chinese lignite by adding KOH to a NaOH solution. The extraction yield of HAs was found to improve because of the synergistic effect imparted by the alkali mixture of sodium hydroxide (NaOH) and potassium hydroxide (KOH). The maximum yield was obtained at 150 min by adding the mixture of 0.750 M NaOH + 0.710 M KOH to Xianfeng lignite at 80 °C. The potassium (K), sodium (Na), nitrogen (N), oxygen (O), and iron (Fe) contents were determined by X-ray diffraction, scanning electron microscopy, and proximate and ultimate analysis. The oxygen-containing functional groups in HAs were identified by Fourier transform infrared spectroscopy. The addition of KOH resulted in higher oxygen/carbon and nitrogen/carbon ratios and oxygen-containing functional groups, as compared with that in NaOH alone. The extractants containing KOH could release HAs with a higher proportion of K, Fe, N contents, which is beneficial for HAs fertilizers prepared from the lignite. The release of the nutrients (K, Fe, N) which are essential for the crops is determined by the KOH dosages.
研究领域:
化学
·
农业科学
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产品关联
DOI
FUEL
·
2025
·
IF 7.5
Caitao Chen,Juan Ma,Yakun Tang,Xiaohui Li,Guangbo Liu,Hanyao Song,Yingluo He,Noritatsu Tsubaki,Lang Liu,Ting Liu
Cleaving the aromatic ether C-O bonds of lignite through catalytic hydroconversion (CHC) presents a significant challenge for producing organic chemicals and clean liquid fuels, which are vital for a sustainable future. In this study, we employed a sacrificial template-self-recovery strategy to synthesize highly dispersed and carbon-coated bimetallic catalysts MCo/C (M = Fe, Cu, Ni) for the CHC of Naomaohu coal (NMHC) and lignite-related model compounds (LRMCs). The carbon-coated NiCo bimetallic alloy catalysts, benefiting from the high dispersity of the active components and the synergistic effect between Ni and Co, exhibited excellent hydrogenolysis activity towards diphenyl ether (DPE). DPE conversion reached 100 % over Ni 3 Co 1 /C under optimal conditions (120 °C, 2 MPa H 2 , 2 h). Moreover, Ni 3 Co 1 /C significantly increased the content of arenes and alkanes while reducing the content of oxygen-containing compounds in the NMHC soluble portion (SP), demonstrating its efficient catalytic hydrogenolysis and hydrodeoxygenation capabilities. Density Functional Theory (DFT) calculations revealed that the Ni 3 Co 1 /C catalyst could activate H 2 to generate hydrogen radicals and diatomic active hydrogen, which are the primary hydrogen species involved in the reaction and affect the CHC of DPE. The experimental results can provide a reference for the conversion of lignite into clean liquid fuels.
研究领域:
化学工程
·
能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）