Article
Energy & Fuels
Hao Liu, Zenghua Li, Yongliang Yang, Guodong Miao, Purui Li, Guoqin Wang
Summary: This study investigates the effect of low-temperature pre-oxidation on the self-heating of coal. The results show that pre-oxidation significantly reduces the oxidation activity of coal and inhibits the oxidation reaction. The total temperature rise of pre-oxidized coal is inversely proportional to pre-oxidation temperature, duration, and number. Additionally, pre-oxidation leads to a decrease in the content of hydroxyl and aliphatic hydrocarbons, while the content of C-O group and carbonyl group increases. Pre-oxidation weakens the activity of active groups and makes the molecular structure of coal more stable.
Article
Thermodynamics
Wenwen Kong, Boxiong Shen, Jiao Ma, Jia Kong, Shuo Feng, Zhuozhi Wang, Lifu Xiong
Summary: The pyrolysis characteristics of Spirulina platensis, Tetradesmus obliquus, and Chlorella vulgaris were investigated by various techniques. The elemental and biochemical composition of different microalgae influenced their pyrolysis behavior. The pyrolysis process of the three microalgae could be divided into several stages, and the major reaction occurred at a certain temperature range. Different products and activation energies were observed for each microalgae. The pyrolysis of Spirulina platensis produced more CO2 and compounds containing C=O bonds, while Tetradesmus obliquus and Chlorella vulgaris produced slightly higher levels of hydrocarbons.
Article
Green & Sustainable Science & Technology
Dan Li, Shijun Lei, Ping Wang, Lei Zhong, Wenchao Ma, Guanyi Chen
Summary: Pyrolysis is a promising technology for recovering valuable hydrocarbons from waste streams. This study investigated three types of waste plastics and their mixed forms to explore thermal cracking features, products distribution, and kinetic features. Results showed differences in pyrolysis products and reaction processes among different types of plastics, with synergistic effects observed during co-pyrolysis processes.
Article
Engineering, Environmental
Mingxin Li, Binchuan Li, Jianshe Chen, Xiaoyi Shen, Shuang Cui, Xiaocai He, Kuiren Liu, Qing Han
Summary: This study investigated the thermal decomposition of ASs and the treatment of toxic gases. The results showed that catalytic oxidation can effectively convert (CN)2 to N-2. Furthermore, this method can facilitate the subsequent treatment of roasting slag, achieving the synergistic treatment of exhaust gases and slag.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Energy & Fuels
Hsien-Tsung Lin, Guan-Bang Chen, Yei-Chin Chao
Summary: This study investigated the thermochemical conversion process of a single wood pellet under low temperatures (350 degrees C-650 degrees C) and identified outstanding low-temperature ignition and combustion characteristics. The results showed that there was a shift from heterogeneous-induced homogeneous combustion phenomenon to volatile auto-ignite mode depending on temperature conditions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Environmental Sciences
Zeshui Cao, Qiang Xu, Haopeng Kang, Jian Shi, Xuyang Lu, Bin Chen, Liejin Guo
Summary: Biochar is a renewable, carbon-neutral energy source that can replace traditional fossil fuels for iron and steel production, reducing carbon emissions and pollution. This study used a thermogravimetric analyzer to investigate the reaction characteristics and kinetics of biomass pyrolysis gas, biochar, and iron ore powder. It was found that the biochar with a C/O ratio of 1 could completely reduce hematite. The reduction process involved four stages, including the transformation of hematite to metallic iron. The results also showed that biochar played a leading role in the reduction process at temperatures below 700 degrees C, while CO produced by biochar gasification played a leading role at higher temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Thermodynamics
Lichao Ge, Can Zhao, Simo Chen, Qian Li, Tianhong Zhou, Han Jiang, Xi Li, Yang Wang, Chang Xu
Summary: In the preparation process of coal-based activated carbon, the carbonization process plays a significant role in the release of volatiles and the formation of pore structure. This study analyzed the properties of two raw materials and investigated their pyrolysis carbonization characteristics using thermogravimetric and Fourier transform infrared spectroscopy. The results showed that the heating rate had a significant impact on the release of volatiles during the carbonization process.
Article
Energy & Fuels
Liangliang Wang, Tengfei Wang, Yao Zhang, Xiaoqiang Peng, Wei Song, Jinshun Yang, Chengdong Yuan
Summary: The thermo-oxidative characteristics and kinetics of HQ heavy oil were studied using TG-DSC-FTIR-MS technique. The oxidation reactions of HQ heavy oil were divided into low temperature oxidation, fuel deposition, and high temperature combustion stages. The reaction mechanisms were analyzed using FTIR and MS analysis. The obtained data provide important references for understanding crude oil oxidation mechanism and simulating ISC processes accurately.
Article
Energy & Fuels
Norbert Miskolczi, Szabina Tomasek
Summary: This study investigated the pyrolysis process of municipal sewage sludge samples using thermogravimetric analysis. The results revealed that decomposition reactions occurred in the range of 200-600℃ and involved biodegradable components, proteins, and carbohydrates. The study also compared different methods for calculating the kinetic parameters and found variations in the activation energy range for samples from different sources.
Article
Energy & Fuels
Gang Liu, Bei Li, Jun Deng, Bing Lai-Wang, Chi-Min Shu
Summary: The study focused on coal oxidation reactions, determining two-step reactions for multi-step reaction mechanisms based on analyzing mass loss rate and gaseous products. The generation of CO2 and CO from carboxyl and aldehyde groups were observed to rapidly increase with temperature, reaching maximum values at 526 degrees C at a heating rate of 10 degrees C/min. The activation energy for coal was calculated to lie between 63.4 +/- 0.1 and 133.37 +/- 0.1 kJ/mol, and the use of two-step reaction mechanisms decreased the average deviation by 2.06% for simulating coal reactions.
Article
Energy & Fuels
Gang Liu, Bei Li, Jun Deng, Bing Lai-Wang, Chi-Min Shu
Summary: Self-ignition of coal is a global problem that requires further study on the reaction mechanism. By analyzing mass loss rate characteristics, gaseous products concentration, and kinetic parameters, a two-step reaction mechanism was determined for the multi-step reactions. The calculated activation energy suggests that the coal reaction is a complex process.
Review
Pharmacology & Pharmacy
Marek Wesolowski, Edyta Leyk
Summary: Using multiple measurement techniques ensures reliable interpretation of sample changes during heating, eliminating uncertainty and improving data interpretation. This paper briefly characterizes thermal analysis techniques coupled with spectroscopic or chromatographic techniques. Various design solutions for coupled thermogravimetry (TG) with infrared spectroscopy (FTIR), mass spectrometry (MS), and gas chromatography/mass spectrometry (GC/MS) systems are discussed. The importance of coupled techniques in pharmaceutical technology is highlighted, as they provide insights into the behavior and degradation of medicinal substances during heating, allowing determination of decomposition mechanisms and prediction of shelf life and storage conditions. In addition, design solutions for interpreting differential scanning calorimetry (DSC) curves using observation or simultaneous recording of FTIR spectra and X-ray diffractograms (XRD) are characterized, addressing the inherent non-specificity of DSC.
Article
Materials Science, Paper & Wood
Ningning Zhao, Haixia Ma, Ergang Yao, Zhong Yu, Ting An, Fengqi Zhao, Xiaojiao Yu
Summary: Al/CuO nanothermites show unique catalytic activities in accelerating the thermolysis of nitrocellulose and combustion characteristics of AP/HTPB propellant, with the morphology of CuO playing a significant role. Introducing well-defined nanostructures is a promising way to enhance the burning rate and catalytic effect of energetic materials.
Article
Energy & Fuels
Lihui Ye, Rongrong Wang, Guangbo Ji, Haohao Wu, Hao Qu, Lu Wang, Jian Liu
Summary: This study analyzed the pyrolysis kinetics of Chaohu algae to produce biochar and demonstrate its potential for electrochemical applications. Various characterization techniques were used to evaluate the properties of the biochar, revealing its unique advantages as a functionalizing material for electrodes in electrochemical applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Analytical
Qiuxiang Yao, Yongqi Liu, Xing Tang, Duo Ma, Linyang Wang, Li Ma, Jing Wang, Ming Sun, Xiaoxun Ma
Summary: The composition and structure of heavy components in coal tar are complex, and this study focused on the multistage gradient extractive separation and analysis of petroleum ether insoluble fractions from low temperature coal tar. The results provided information on the composition and structure of these fractions, which have implications for the further processing and utilization of coal tar.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
