Journal of Energy Chemistry
·
2021
·
IF 9.676
Yu Kang,Yujia Han,Cong Wei,Kuo Liu,Ming Tian,Chuande Huang,Chaojie Wang,Jian Lin,Baolin Hou,Xiaoli Pan,Yang Su,Lin Li,Riguang Zhang,Yong Hao,Xiaodong Wang
Thermochemical two-step CO 2 splitting is a potential approach that fixes the sustainable resource into transportable liquid fuels. However, the harsh CO 2 splitting conditions, the limited oxygen release kinetics and capacity of metal oxides block further promoted the CO yield and solar-to-fuel energy efficiency. Here, we propose a different carbon cycle assisted by Ni/La 2 O 3 via coupling methane decomposition with thermochemical CO 2 splitting, replacing conventional metal oxides cycle. Superior performance was demonstrated with methane conversion reached around 94% with almost pure H 2 generation. Encouragingly, CO 2 conversion of 98% and CO yield of 6.9 mmol g −1 derived from CO 2 were achieved, with peak CO evolution rate (402 mL min −1 g −1 ) of orders of magnitude higher than that in metal oxide process and outstanding thermodynamic solar-to-fuel energy efficiency (55.5% vs. 18.5%). This was relevant to the synergistic activation of La 2 O 3 and Ni for CO 2 in carbon cycle, thus improving CO 2 splitting reaction with carbon species.
研究领域:
能源化学
·
催化化学
·
可持续能源
·
热化学转化
·
二氧化碳利用
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Junwang Zhang,Lili Song,Kunlan Li,Qingda An,Hao Ma,Liyu Yang,Ligang Wei
Water addition was found to enhance the thermal stability of alkylimidazolium–acetate ionic liquids (ILs). Especially in the case of high water content (30–50 wt%), few decomposition products can be observed in the 1 H NMR spectra even after treatment for 24 h at 150 °C. On the basis of this finding, lignin treatment of water and acetate IL mixtures (50–90 wt% IL content) were investigated at 150 °C. The addition of water, as opposed to pure IL treatment, can inhibit the lignin depolymerization into small fragments. Lignin degradation and the structure of regenerated lignin are more affected by cation types of ILs rather than the IL contents and pH values. In the case of 50–70 wt% 1-ethyl-3-methylimidazolium acetate–water system, the specific inter-unit linkages of lignin can be broken down, and regenerated lignin with a narrow polydispersity index (5.0–9.6) can be obtained.
研究领域:
绿色化学
·
生物质转化
·
高分子化学
·
离子液体化学
·
木质素化学
·
可持续材料
·
热化学转化
✓ 已验证
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Yu-hong Qin,Min-min Feng,Zi-bing Zhao,Stanislav V. Vassilev,Jie Feng,Christina G. Vassileva,Wen-ying Li
The ash fusion process of Jincheng anthracite ash, rice straw ash and coal-biomass ashes with different rice straw ash addition ratios during co-gasification under CO 2 atmosphere was elucidated by the ash fusion test, chemical analyses, optical heating stage microscopy (OHSM), X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray analyzer. Results showed that the initial sintering and initial melting temperatures of coal-biomass ashes observed by OHSM decreased with the addition of rice straw ash. The deformation temperatures determined by the ash fusion test were close to the initial melting temperatures. The biomass ash addition to coal ash introduced excessive amounts of alkaline compounds in the ash mixtures that led to lower initial temperatures of liquid phase formation. The ash fusion behavior of coal-biomass ashes with a rice straw ash addition ≤3 wt% was similar to that of coal ash and fits to the “softening-melting” ash fusion mechanism. In contrast, the ash fusion behavior of coal-biomass ashes with a greater addition of rice straw ash (>3 wt%) experienced dramatic changes at lower temperature and fits to the ‘‘melting-dissolution’’ ash fusion mechanism.
研究领域:
燃料化学
·
能源工程
·
热化学转化
·
燃烧学
·
灰化学
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2019
·Vol. 26
·期 12
·1512-1522
·
IF 1.221
Zhao Jun,Zuo Hai-bin,Wang Jing-song,Xue Qing-guo
The high-value utilization of low-rank coal would allow for expanding energy sources, improving energy efficiencies, and alleviating environmental issues. In order to use low-rank coal effectively, the hypercoals (HPCs) were co-extracted from two types of low-rank coal and biomass via N-methyl-2-purrolidinone (NMP) under mild conditions. The structures of the HPCs and residues were characterized by proximate and ultimate analysis, Raman spectra, and Fourier transform infrared (FT-IR) spectra. The carbon structure changes within the raw coals and HPCs were discussed. The individual thermal dissolution of Xibu (XB) coal, Guandi (GD) coal, and the biomass demonstrated that the biomass provided the lowest thermal dissolution yield Y 1 and the highest thermal soluble yield Y 2 at 280°C, and the ash content of three HPCs decreased as the extraction temperature rose. Co-thermal extractions in NMP at various coal/biomass mass ratios were performed, demonstrating a positive synergic effect for Y 2 in the whole coal/biomass mass ratios. The maximum value of Y 2 was 52.25wt% for XB coal obtained with a XB coal/biomass of 50wt% biomass. The maximum value of Y 2 was 50.77wt% for GD coal obtained with a GD coal/biomass of 1:4. The difference for the optimal coal/biomass mass ratios between XB and GD coals could be attributed to the different co-extraction mechanisms for this two type coals.
研究领域:
能源化学
·
煤化工
·
生物质转化
·
热化学转化
·
资源综合利用
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhanshi Ni,Haobo Bi,Chunlong Jiang,Hao Sun,Wenliang Zhou,Zhicong Qiu,Qizhao Lin
Faced with increasingly severe environmental and energy issues, the development and utilization of solid waste have become a trend. In this study, a thermogravimetric-Fourier infrared spectrometer-mass spectrometer (TG-FTIR-MS) was used to carry out the co-pyrolysis experiment of coal slime and cellulose. The samples with mass mixing ratios of 0:10, 1:9, 3:7, 5:5, 7:3, 9:1, and 10:0 were pyrolyzed in N 2 atmosphere. The percentages of mass loss during the pyrolysis of coal slime and cellulose were 15.69 and 94.28%, respectively. The addition of cellulose to the coal slime could significantly improve the pyrolysis performance of the sample. It was detected by FTIR that the pyrolysis of the blends mainly formed C=O-containing compounds. MS was used to monitor the ion current intensity of gaseous products of sample pyrolysis online. The average activation energy of the reaction between coal slime and cellulose calculated by the Kissinger-Akahira-Sunose method were 237.59 kJ/mol and 174.06 kJ/mol, respectively. The principal component 1 and principal component 2 dominated the co-pyrolysis process of coal slime and cellulose. The MAE, RMSE, and R 2 of the artificial neural network prediction model for predicting the pyrolysis process of the sample were 0.5249, 0.8244, and 0.9994, respectively. This research provided basic theory and data support for understanding the co-pyrolysis of coal slime and biomass.
研究领域:
能源化学
·
环境科学
·
热化学转化
·
可再生能源
·
固体废物利用
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Yan Shi,Xueying Xia,Jingdan Li,Jing Wang,Tiantian Zhao,Hongmin Yang,Jianchun Jiang,Xiaoxiang Jiang
The solvolysis behavior and reaction kinetics of the three components of biomass (cellulose, hemicelluloses and lignin) liquefied in polyhydric alcohols (PEG 400 or glycerol) were investigated in this paper. Three stages were observed during the solvolysis process and the main degradation stage could be further divided into two zones. The influences of solvents on the liquefaction process of three main components were compared. Based on Starink and Malek methods, kinetic parameters and mechanism functions were obtained. The derived average activation energy of cellulose, hemicellulose and lignin were 108.73, 95.66 and 94.13 kJ mol −1 in PEG 400, while the values were 102.16, 77.43 and 89.10 kJ mol −1 in glycerol, respectively. Higher efficiency was observed when using glycerol as solvent, which could be ascribed to the higher polarity value of glycerol. The conversion curves calculated with obtained mechanism models and kinetic parameters were in good agreement with the experimental data.
研究领域:
生物质化学
·
热化学转化
·
反应动力学
·
绿色溶剂
·
高分子降解
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）