Article
Chemistry, Physical
Fan Yang, Qingbo Yu, Wenjun Duan, Zhenfei Qi, Qin Qin
Summary: Electrochemical catalytic gasification (ECG) is a new approach for achieving high efficiency coal gasification at low reaction temperatures. Compared to common coal gasification (CCG), ECG yields higher carbon conversion, CO production and combustible components, which increase with power. In the ECG process, thermal electrons play a significant role.
CATALYSIS COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Man Zhang, Hongyu Ban, Zhiqing Wang, Xinning Xiang, Xiaolei Wang, Qian Zhang
Summary: The impact of K(2)CO(3) catalyst on the gasification of petroleum coke was studied. The results showed that increasing the amount of K(2)CO(3) greatly reduced the gasification temperatures of the coke. However, beyond a certain concentration of K+, the catalytic reaction became saturated. Further increase in the catalyst did not inhibit the gasification rate. The vaporization of the catalyst was observed during high-temperature gasification. XRD, Raman spectroscopy, and N-2 adsorption analyses revealed that the presence of the catalyst altered the carbon crystallite structure of the residual coke.
Article
Thermodynamics
Hengyang Miao, Zhiqing Wang, Zhefan Wang, Haochen Sun, Xiangyu Li, Zheyu Liu, Libo Dong, Jiantao Zhao, Jiejie Huang, Yitian Fang
Summary: In this study, CO2 catalytic gasification was utilized for the utilization of coal gangue (CG). The effects of Na2CO3 and Na(2)SO(4) catalysts on the catalytic and activation reactions were comprehensively evaluated. The presence of alkali metal salts improved the gasification reactivity and aluminum extraction yield, and the effects increased with temperature. Na2SO4 loaded ash showed a significant variation in mineral species and achieved a peak extraction yield at 850°C. The aluminum ions solution obtained from Na(2)SO(4) loaded ash was purer and had a stronger ability to activate aluminum in minerals compared to that from Na2CO3 loaded ash. The research findings contribute to the high-value utilization of coal gangue and Na2SO4.
Article
Green & Sustainable Science & Technology
Agnieszka Korus, Giulia Ravenni, Krzysztof Loska, Irena Korus, Abby Samson, Andrzej Szlek
Summary: Gasification char is an effective catalyst for tar reforming due to its abundance of surface active sites for heterogeneous conversion of hydrocarbons and interactions with reforming agents. The reactivity of char during gasification in CO2 is mainly influenced by metal content, while the conversion of toluene is strongly correlated with the surface area available for reactions.
Article
Chemistry, Physical
Shilin Du, Yichen Dong, Feiqiang Guo, Beile Tian, Songbo Mao, Lin Qian, Chengyun Xin
Summary: The potential of using high metals containing coal gangue and lignite to prepare high-activity coal char-based catalysts for effective biomass tar decomposition is investigated. The loose structure and rough surface are formed for these char-based catalysts with heterogeneous distribution of a large number of inorganic particles. A high biomass tar conversion efficiency of 93.5% is achieved at 800 degrees C, showing the remarkable stability of the catalyst in biomass tar decomposition applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Qili Qiu, Danping Pan, Wendi Zhang, Fan Zeng, Longlong Liu
Summary: This study investigates the effects of KCl concentration on the gasification characteristics of lignite coal char. The presence of a catalyst reduces the required temperature and increases the reaction rate of gasification. Higher concentrations of KCl lead to an accelerated gasification reaction and stronger catalytic effects. Additionally, adding KCl decreases the activation energy and energy level required for the gasification reaction.
Article
Energy & Fuels
Deming Zhang, Libo Lu, Yifei Ren, Hui Jin, Wenwen Wei, Zening Cheng, Liejin Guo
Summary: This study investigated the impact of NaAlO2 on K2CO3-catalyzed coal gasification and found that the addition of NaAlO2 can inhibit ash agglomeration, reduce the volatility of alkali metals, and improve carbon gasification efficiency.
Article
Energy & Fuels
Meng Ma, Jiaofei Wang, Yonghui Bai, Peng Lv, Xudong Song, Weiguang Su, Lu Ding, Juntao Wei, Guangsuo Yu
Summary: Volatile-char interactions affect the chemical structure and reactivity of coal char, with O-containing functional groups playing an important role in char reactivity. The decrease in gasification reactivity due to volatile-char interactions is attributed to the decrease in aromatic C-O and C=O, and the increase in graphite carbon structures.
Article
Energy & Fuels
Zixin Jiao, Li Liu, Yan Zhao, Xiye Chen, Penghua Qiu
Summary: The study evaluated the cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 and found that increasing the blend ratio of CS and gasification temperature can weaken inhibition and enhance synergy. The addition of CS volatiles, especially potassium (K), can promote the cogasification reaction, with the promotion effect increasing with temperature. The comparison between CS-SM blend char and CS char volatiles-SM char showed different effects on gasification reactivity depending on the presence of alkali and alkaline earth metals.
Article
Chemistry, Applied
Hengyang Miao, Zhiqing Wang, Haochen Sun, Xiangyu Li, Yangang Mei, Zheyu Liu, Libo Dong, Jiejie Huang, Jin Bai, Yitian Fang
Summary: Simultaneously converting gangue into inorganic material and gaseous fuel is meaningful. Experimental results showed that catalytic gasification of gangue with Na2CO3 can effectively activate minerals, with the highest aluminum extraction yield of 92%. It was also found that temperature has a minimal effect on mineral types, while the gasification of carbon element promotes mineral reactions.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Xuejun Qi, Shuang Lin
Summary: The addition of iron catalyst has been found to increase the number of surface active sites in low-rank coal char, thereby enhancing its gasification reactivity.
SCIENTIFIC REPORTS
(2022)
Review
Engineering, Chemical
Fei Dai, Shengping Zhang, Yuanpei Luo, Ke Wang, Yanrong Liu, Xiaoyan Ji
Summary: Coal gasification is a core technology for clean coal utilization, enabling hydrogen-rich syngas production and reducing CO2 emissions. This review provides a brief overview of various coal gasification techniques, including conventional (fixed bed, fluidized bed, and entrained bed) and new (supercritical water, plasma, chemical-looping, and decoupling) gasification methods, discussing their gasifiers, process parameters, advantages, and challenges. Moreover, the potential of hydrogen production through different coal gasification technologies is analyzed. The decoupling gasification technology based on pyrolysis, coal char-CO2 gasification, and CO shift reaction is highlighted for its comprehensive coal utilization, low-energy CO2 capture and conversion, and efficient hydrogen production. This review also presents recent research advances in coal char-CO2 gasification, evaluating the influence of factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the gasification performance.
Article
Materials Science, Multidisciplinary
Tieying Wang, Kaichen Wang, Tianying Zhang, Feng Ye, Zhirong Liao, Chao Xu
Summary: This study investigated the wetting behavior of carbonate salts on coal fly ash ceramic substrates with varying expanded graphite contents through contact angle measurements. Results showed that the surface microstructure of substrates and adhesion of salt to substrates influenced the wetting behavior. The presence of salt infiltration during experiments required modification of measured contact angles to eliminate the infiltration effect.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Energy & Fuels
Chen Liang, Xiaofang Wang, Qinggang Lyu
Summary: Using oxygen and steam as gasifying agent in a Circulating Fluidized Bed (CFB) preheater can enhance the gasification reactivity of coal; replacing air by O-2-steam in the gasifying agent and controlling the modification temperature and steam to coal ratio can improve the gasification reactivity of modified char; the gasification reactivity of modified char increases and then decreases with the highest value at a steam to coal ratio of 0.87.
Article
Energy & Fuels
Huifang Feng, Jingli Sun, Hui Jin, Jiajing Kou, Liejin Guo
Summary: The study found that adding phenol can increase coal gasification efficiency and inhibit char formation, leading to an increased hydrogen yield. Phenol effectively suppresses char formation and enhances char reactivity.
Article
Chemistry, Physical
Xiaodong Huo, Zhiqing Wang, Jiejie Huang, Rong Zhang, Yitian Fang
CATALYSIS COMMUNICATIONS
(2016)
Article
Chemistry, Multidisciplinary
Xiaodong Huo, Zhiqing Wang, Jiejie Huang, Rong Zhang, Yitian Fang
Article
Thermodynamics
Qian Zhang, Qingfeng Li, Linxian Zhang, Zhongliang Yu, Xuliang Jing, Zhiqing Wang, Yitian Fang, Wei Huang
Article
Energy & Fuels
Li Li, Zhiqing Wang, Jiejie Huang, Shaohua Ji, Yangang Mei, Yongwei Wang, Yitian Fang
Article
Energy & Fuels
Yangang Mei, Zhiqing Wang, Huibin Fang, Yongwei Wang, Jiejie Huang, Yitian Fang
Article
Chemistry, Physical
Tao Liu, Shunxuan Hu, Zhongliang Yu, Jiejie Huang, JiaZhou Li, Zhiqing Wang, Yitian Fang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
Article
Thermodynamics
Yongwei Wang, Zhiqing Wang, Jiejie Huang, Yitian Fang
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
Article
Thermodynamics
Guang Li, Zheyu Liu, Junguo Li, Yitian Fang, Jie Shan, Shuai Guo, Zhiqing Wang
APPLIED THERMAL ENGINEERING
(2018)
Article
Engineering, Environmental
Qian Zhang, Qingfeng Li, Hongliang Wang, Zhiqing Wang, Zhongliang Yu, Linxian Zhang, Wei Huang, Yitian Fang
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Energy & Fuels
Songping Gao, Lingrui Zhai, Yuhong Qin, Zhiqing Wang, Jiantao Zhao, Yitian Fang
Article
Thermodynamics
Guang Li, Zheyu Liu, Tao Liu, Jie Shan, Yitian Fang, Zhiqing Wang
ENERGY CONVERSION AND MANAGEMENT
(2018)
Article
Energy & Fuels
Meijie Du, Jiejie Huang, Zheyu Liu, Xing Zhou, Shuai Guo, Zhiqing Wang, Yitian Fang
Article
Chemistry, Applied
Zhi-Rong Yang, Qing-Yan Meng, Jie-Jie Huang, Zhi-Qing Wang, Chun-Yu Li, Yi-Tian Fang
FUEL PROCESSING TECHNOLOGY
(2018)
Article
Chemistry, Physical
Guang Li, Zheyu Liu, Rongtao Feng, Weihong Jiao, Yitian Fang, Zhiqing Wang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2018)
Article
Chemistry, Physical
Guang Li, Zheyu Liu, Junguo Li, Yitian Fang, Tao Liu, Yangang Mei, Zhiqing Wang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2018)