INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2012
·
IF 2.237
Wenhua Wang,Yucui Hou,Weize Wu,Muge Niu,Tong Wu
Alkali-oxygen oxidation of coals to produce high-value benzene polycarboxylic acids (BPCAs) is a potential substitute for the petroleum route in the future. However, the high amount of alkali consumed in the process stands as a significant obstacle for the practical application of this approach. In the present work, lignite, chosen as the raw material, was oxidized at temperatures higher than those reported so far. The results showed that, as the temperature increased, a gradually shortened reaction time and decreased alkali/coal mass ratio were required to obtain the maximum total yield of BPCAs, which remained about 20%. A total BPCA yield of 20.4% was obtained at conditions of 300 °C, 0.8/1 alkali/coal mass ratio, and 1 min, whereas the traditional method employs the conditions of 240 °C, 3/1 alkali/coal mass ratio, and 30 min to obtain a maximum BPCA yield of 20.5%. The distributions of BPCAs obtained by the two methods were found to be very close to each other. Excess alkali employed in the system can decrease the yield of BPCAs through the salting-out effect, with a more significant effect at higher reaction temperatures. The enhanced salting-out effect induced by excess alkali concentration delays the diffusion of intermediates formed on the lignite surface to the water phase, during which the parent structures for the BPCAs are possibly overoxidized to carbon dioxide. The high-temperature oxidation of lignite dramatically decreases the amount of alkali consumed and improves the production efficiency of BPCAs, which is very important for the industrialization of this process.
研究领域:
煤化学
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有机地球化学
·
能源材料化学
·
工业催化
·
绿色化工
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Mei-Xia Zhao,Bo Meng,Juan-Juan Zheng,Ning Yang,Fang-Jing Liu
Lignite-derived residue with cross-linked aromatic structure and heteroatom groups is an alternative and low-cost precursor for porous carbon. Herein, N-doped hierarchically porous carbon (NDHPC) was prepared by KOH activation from lignite-derived residue using ZnO as the template and dicyandiamide as the nitrogen source. The optimal NDHPC presents hierarchically porous stacked layered structure with high specific surface area (2648.18 m 2 /g) and contains abundant O/N functional groups, making it promising candidate as the electrode material. Introducing nitrogen can provide more pseudocapacitors and meanwhile improve the wettability of the NDHPC, thus enhancing electrochemical performance. The optimal NDHPC exhibits a high specific capacitance of 336 F g −1 at the current density of 0.5 A g −1 with good rate performance. Additionally, the assembled NDHPC symmetrical supercapacitor presents outstanding cycle stability with 96.2 % capacitance retention and possesses energy density of 7.85 Wh kg −1 at power density of 250 W kg −1 . This study offers an effective and low-cost approach to fully utilize the organic matter in coal-derived residue for preparing supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Wei-Tu Li,Xian-Yong Wei,Xue-Ke Li,Xiang-Xue Liu,Zhan-Ku Li,Zhi-Min Zong
Catalysts Ni/γ-Al 2 O 3 , Mg 2 Si/γ-Al 2 O 3 , and Ni-Mg 2 Si/γ-Al 2 O 3 were prepared. Their activities for catalytic hydroconversions (CHCs) of some lignite-related model compounds were examined. For the CHCs of oxydibenzene (ODB), benzyloxybenzene, and oxybis(methylene)dibenzene, the suitable loadings of Ni and Mg 2 Si are 33 and 20% in Ni-Mg 2 Si/γ-Al 2 O 3 , respectively, and the optimal reaction conditions are 4 MPa of initial hydrogen pressure, 240 °C, and 2 h, under which ODB was almost completely converted to cyclohexane. The formation of possible intermediates during the CHC of ODB was discussed. Ni-Mg 2 Si/γ-Al 2 O 3 was proposed to have 3 functions, i.e., activating H 2 to biatomic active hydrogen (H⋯H), releasing H − , and heterolytically splitting H⋯H to release H − as well, resulting in the hydrogenation of aromatic rings and the hydrocracking of C O bonds, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Zi-Fan Wu,Xian-Yong Wei,Wen-Long Mo,Yu-Hong Kang,Xiao-Qi Zhang,Xian-Kang Shan,Guang-Hui Liu,Xing Fan
TFMSA/ATA was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto the acid-treated attapulgite (ATA). Yinggemajianfeng lignite was extracted ultrasonically with a mixed solvent obtain the extract and extraction residue (ER), and then ER was separated by density difference to obtain the light residue (LR). The non-catalytic hydroconversion (NCHC) and TFMSA/ATA-catalyzed hydroconversion of LR were investigated in cyclohexane at 160 °C under 4 MPa of initial hydrogen pressure for 12 h. The soluble portions from NCHC (SP NCHC ) and catalytic hydroconversion (SP CHC ) were analyzed with a Fourier transform infrared spectrometer and gas chromatograph/mass spectrometer. As a result, the yield of SP CHC (60.0%) is significantly higher than that of SP NCHC (1.8%), suggesting that the thermal dissolution of LR at 160 °C is negligible and TFMSA/ATA significantly catalyzed the hydrocracking of LR to release SP CHC . Oxygen-containing organic compounds, especially 4-methylpent-3-en-2-one and 4-hydroxy-4-methylpentan-2-one, are predominant produced from the CHC of LR, suggesting that the cleavage of > C α -O β - and > C β -O α - bonds in LR significantly proceeded during the CHC of LR over TFMSA/ATA. Such a mechanism was proved by the CHC of oxybis(methylene)dibenzene.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Tong An,Yan Qin,Hao Cheng,Jianning Wu,Weihua Su,Guihua Meng,Hongxiao Wei,Chenhui Sun,Zhiyong Liu,Xuhong Guo
Phosphorus (P) is an essential nutrient widely used in crops. Phosphate fertilizers are easily adsorbed on the soil surface, resulting in poor migration to the roots of crops, and a large amount of nutrients cannot be absorbed and utilized, resulting in waste of resources and low bioavailability . To solve the problem of insufficient mobility of phosphate fertilizer, this work uses TiO 2 -WO 3 to catalyze the oxidation and pyrolysis of lignite to synthesize small molecular humic acid , and uses small molecular humic acid to coat commercial phosphate fertilizer (MAP) to obtain a new type of phosphate fertilizer (AMAP) with good fluidity. Water contact angle was determined from initially hydrophobic (132°) to hydrophilic (76°). Humic spectroscopic ratio (E 4 /E 6 ), H/C and molecular weight distributions confirmed the effectiveness of the TiO 2 -WO 3 catalyst and the successful modification of weathered lignite. The migration characteristics of phosphorus in the soil were studied by leaching migration experiments. The results showed that the effective phosphorus content of the new coated phosphate fertilizer (AMAP) in the soil exceeded that of the commercial phosphate fertilizer (MAP) at different vertical migration distances. After 21 d of incubation at the same fertilizer level, new coated phosphate fertilizer (AMAP) of phosphate fertilizer added with different products showed elevated levels of P. Migration data indicated that the migration distance of effective phosphorus approximated the long root distance of early corn, which benefitted crop growth. The pot experiment confirmed improved corn growth and improvement in the utilization rate of phosphorus fertilizer. All in all, activated lignite (AHA) can reduce or inhibit the fixation of phosphorus nutrients in the soil, and has obvious application value for improving the efficiency of phosphate fertilizers.
研究领域:
农业科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Guang-Hui Liu,Yu-Hong Kang,Yong Gao,Yan-Jun Li,Xiang-Rong Ma,Rui Dang,Long Yan,Wei-Wei Yan,Hong-Cun Bai,Zhi-Min Zong,Xian-Yong Wei
An in-situ and ex-situ cascade upgrade strategy was designed and used for upgrading Dahuangshan lignite-derived soluble mixtures (LDSMs) to obtain value-added chemicals and clean liquid fuels (CLFs), respectively. In the H 2 -free catalytic ethanolysis, Ni/mordenite can effectively activate ethanol and promote the transfer of various free radicals including H·, CH 3 CH 2 ·, and CH 3 CH 2 O·, which synchronously facilitates the cleavage of bridged bonds in Dahuangshan lignite and the in-situ removal of heteroatoms (HAs) from LDSMs. As a result, the total yield of LDSMs increased from 40.6 to 66.5 wt%, wherein that of ethanol-soluble portion (ESP) increased from 21.4 to 32.4 wt%. Interestingly, alkanes and arenes with higher relative content (RC, 38.1%) were detected in ESP C (for catalytic ethanolysis), while arenols (24.7%) dominate ESP N (for ethanolysis). The analysis with a quadrupole exactive orbitrap mass spectrometer further confirmed the significant decrease in the relative abundance of HAs, especially O x class species, in ESP C . In addition, ESP N and ESP C with different properties were further used for enriching derived chemicals and for obtaining CLFs by catalytic hydroconversion (CHC), respectively. After the CHC, the total RCs of alkanes and cyclanes in the soluble portion (SP) are as high as 71.3%, and the content of HA-containing organic compounds was further decreased. Therefore, such SP containing less HAs is an attractive CLF precursor. A ternary mixed solvent was also designed for rapidly separating the SP from ESP N . The total RC of alkanes and arenes in PE 5 as well as arenols in M 5 are as high as 79.4 and 70.9%, respectively. Molecular dynamics simulations were further used to reveal the rapid enrichment mechanisms with ternary mixed solvents.
研究领域:
化学工程
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能源科学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2026
·
IF 7.8
Chuang Zhang,Xiao-Yan Zhao,Wen Li,Chen Xu Chen,Wei Jiang,Jing-Pei Cao
A two-step oxidation method involving HNO 3 pretreatment and ozone oxidation was employed to effectively depolymerize Shengli lignite (SL) into nitrohumic acids. This approach achieved a high organic matter conversion of 82.48% and a nitrohumic acids yield of 72.75%. The high yield of nitrohumic acids is attributed to ozone oxidation of HNO 3 -treated SL (NASL), which introduced nitro (–NO 2 ) groups into the lignite. The chemical properties of NASL are characterized by an increase in O and N content, while C, H, and S content are reduced. Mechanistic analysis revealed that oxidative cleavage of ether bonds is the main pathway for the decomposition of lignite macromolecular networks into nitrohumic acids. This study provides a novel and efficient strategy for the production of nitrohumic acids, offering valuable insights into the comprehensive utilization of lignite.
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2016
·
IF 3.847
Mei-Xia Zhao,Xian-Yong Wei,Meng Qu,Zhan-Ku Li,Jing Liu,Yan Li,Jiao Kong,Wei Zhao,Zhi-Min Zong
A novel solid acid was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto attapulgite powder (AP). Benzyloxybenzene (BOB) was used as a lignite-related model compound to evaluate the catalytic activity of TFMSA/AP for cleaving C alk –O bridged bonds in lignites. The results show that BOB was mainly hydrocracked to toluene, phenol , and (ethoxymethyl)benzene over TFMSA/AP in ethanol without adding gaseous hydrogen. In addition, ethanol participated in and significantly facilitated BOB hydrocracking . Based on the kinetic investigation, BOB hydrocracking over TFMSA/AP is absent of mass transfer limitations with the apparent activation energy of only 19.4 kJ mol − 1 , which is far smaller than the dissociation energy (209.2 kJ mol − 1 ) of C alk –O bridged bond in BOB. The proton transfer directly from TFMSA/AP and/or via ethanol dehydrogenation to the oxygen atom of BOB could be the crucial step for BOB hydrocracking over TFMSA/AP.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 100
·期 12
·3750-3759
·
IF 2.5
Ning Ding,Mei Li,Jinsong Yue,Sidan Cheng,Caiyun Gao
In order to improve the extraction rate of coal by solvent extraction, Lianhuatang lignite (LHT) was pretreated with 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid([Bmim]PF 6 ) firstly. Then, the Soxhlet extraction (SE), ultrasound-assisted extraction (UAE), and microwave-assisted extraction (MAE) were carried out to obtain extracts (E S1-3 , E U1-3 , and E M1-3 ) and residues (R S1-3 , R U1-3 , and R M1-3 ) from the Lianhuatang lignite pretreated with ionic liquid (BLHT), respectively, and CS 2 , acetone, and ethanol were used as solvents. The coal samples before and after the ionic liquid pretreatment were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analyzer (TG). The residues were characterized by FTIR, and the extracts were characterized by a gas chromatograph/mass spectrometer (GC/MS). According to the results, ionic liquid can crack coal particles, increase the contact area of coal surface with solvent, and destroy part of the hydrogen bonds and intermolecular forces in coal, enabling easy extraction of the active small molecules. The macromolecular structure of coal is not destroyed in the three sequential extraction experiments. The types of extracts are similar under different methods, but the specific substances are very different. The total extraction rate by MAE was the highest, which was 48.70%. Microwave radiation can promote the extraction of oxygen-containing substances, especially esters.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Xiaoxiao Zhou,Miaomiao Feng,Dandan Luo,Lan Yi,Jialing Chen,Pengzhi Bei,Hao Luo,Xiaoqin Wu,Wen-Ying Li
Unlocking the cross-linked network structure of low-rank coal is pivotal for its high-value utilization, yet this process is severely constrained by mass transfer resistance. To address this challenge, a “carrier-permeation” synergistic strategy is proposed herein, which integrates high-permeability dimethylformamide (DMF) with high-activity deep eutectic solvents (DES). Molecular dynamics simulations indicate that DMF may function as a molecular carrier, promoting the deep penetration of viscous DES components into the coal matrix. Experimentally, this synergistic effect induces substantial physical restructuring: particle size is reduced by more than 82% (to 22.57 μm) and the aromatic interlayer spacing ( d 002 ) is increased to 0.355 nm via effective disruption of stacking interactions. Chemically, the system achieves an exceptional desulfurization rate of 90.81%, along with the selective cleavage of ether bridges and long aliphatic chains (CH 2 /CH 3 ratio minimized to 2.71). Consequently, pyrolysis pathways are substantially redirected by this structural remodeling, shifting product distribution from low-value alkanes to high-value olefins (50.47%) and esters (24.09%). A molecular-scale deconstruction system is elucidated, offering a novel approach for clean and value-added utilization of lignite.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Fan Yang,Yucui Hou,Muge Niu,Ting Lu,Weize Wu,Zhenyu Liu
Carboxylic acids (CAs) are considered as an important group of chemicals and are widely used in the chemical industry. The production of CAs via oxidation of lignite is a promising industrial process. In the present work, we found that H5PV2Mo10O40 (HPA) was beneficial to catalytic oxidation of lignite by O2 in aqueous H2SO4 solutions to produce CAs. The effects of HPA concentration, H2SO4 concentration, reaction temperature, initial O2 pressure, and reaction time on lignite conversion and CA yield were studied. The catalytic oxidation of lignite in aqueous HPA/H2SO4 solutions with O2 can yield 56.9 wt % CAs, including 33.5 wt % formic acid, 14.4 wt % acetic acid, 1.5 wt % succinic acid, 1.1 wt % oxalic acid, and 6.4 wt % benzene carboxylic acids (BCAs, including 12 types) at 170 °C and 3 MPa for 60 min. In this catalyst system, the existence of H2SO4 can change the catalytic activity of HPA, and the synergistic effect of HPA and H2SO4 can significantly promote the production of CAs. VV can oxidize lignite or intermediates to form VIV, which can be reoxidized by O2 to complete a redox cycle. In the catalytic oxidation, lignite was converted into water-soluble intermediates at first, and then the water-soluble intermediates were converted to CAs. The catalyst system was reused four times without significant decline in activity. Compared with the traditional alkali-oxygen oxidation, this method can decrease the usage of mineral acid and alkali and lower reaction temperatures.
研究领域:
能源化学
·
工业催化
·
环境化学
·
有机化学
·
资源利用
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Hongliang Li,Rui Li,Mengmeng Wang,Jianbo Li,Yafeng Fu,Benkang Zhu
Previous studies verified that the moisture adsorption on the lignite can be reduced by adsorption of surfactant on the surface. However, these surfactant adsorption processes were realized in aqueous solutions, result in a great deal of water bring into the system. It seems that the surfactant is affinity to the surface of lignite and the adsorption can be realized in dry condition with a well-designed method. In this study, we propose a method to reduce the adsorption of moisture by lignite in dry condition, by mechanically mixing it with a surfactant in a ball mill. The surfactant is adsorbed by the lignite surface toward due to the electrostatic interactions during the mixing process, which makes the lignite surface hydrophobic. Untreated and treated samples of lignite were exposed in an environment of 100% relative humidity, maintained at 20 °C, for 36 h. Compared to the untreated sample, the moisture content in the treated sample decreased from 25.9% to 11.6%. This reduction in the adsorbed moisture content is due to the modification of the hydrophobicity of the original sample. The particle size of the lignite decreases significantly after ball milling. As the particle size required for the commercial utilisation of lignite is usually low, the proposed method can be applied after the dry beneficiation process.
研究领域:
环境科学
·
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）