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
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
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
Thermodynamics
Xinsha Zhang, Meng Ma, Yonghui Bai, Weiguang Su, Xudong Song, Peng Lv, Jiaofei Wang, Guangsuo Yu
Summary: This study discusses the possibility of using torrefaction under CO2 as a pretreatment for industrial solid waste sludge, improving its gasification performance. The results showed that the torrefaction under CO2 can significantly enhance the gasification performance of the sludge.
THERMOCHIMICA ACTA
(2022)
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
Chemistry, Analytical
Haigang Zhang, Zhongjie Shen, Zizheng Dong, Yiru Yang, Jianliang Xu, Qinfeng Liang, Haifeng Liu
Summary: This paper investigates the effects of temperature and oxygen content on coal pyrolysis product distribution, char structure, and reactive properties. The results show that higher temperature enhances the release of volatiles and tar cracking, leading to increased gas phase yield and syngas concentration. However, temperatures above 900 degrees Celsius intensify char graphitization, which is not favorable for gasification. Oxygen introduction at 900 degrees Celsius accelerates the release of volatiles and intensifies depolymerization reaction, increasing the gas yields of CO and CO2. The presence of trace oxygen reduces char graphitization and improves gasification reactivity but high oxygen content (8%) leads to combustion on the char surface, destroying its structure and reducing gasification activity.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Ruidi Wei, Liwei Ren, Fujiang Geng
Summary: The study found that there were significant differences in gasification reactivity between coal chars and petcokes, with the gasification reactivity of coal chars increasing as coal rank decreased. The characteristics of the chars were closely related to their gasification reactivity, with lower degree of graphitization and more developed pore structure leading to higher gasification reactivity. Furthermore, the presence of oxygen-containing functional groups and active components in coal chars had a promoting effect on the gasification reaction.
JOURNAL OF THE ENERGY INSTITUTE
(2021)
Article
Energy & Fuels
Jingchun Huang, Chao Feng, Yun Yu, Di Xie, Zhenqi Wang, Wei Hu, Yu Qiao
Summary: Steam gasification of leftover rice involves pyrolysis, volatile reforming, and char gasification stages. Experiments conducted at temperatures ranging from 600 to 1000 degrees C show that raw leftover rice can be cracked into volatile products at 600 degrees C, generating high yields of tar and gas. The study also demonstrates that torrefied leftover rice generates lower gas yields at all pyrolysis temperatures. This research provides valuable data for designing suitable gasification reactors for food waste.
Article
Engineering, Environmental
Xin Niu, Yonglai Xu, Laihong Shen
Summary: Chemical looping gasification combined with torrefaction is an alternative technology to efficiently utilize rapeseed cake, improving its energy density and promoting the production of nitrogen species. The findings provide guidance for understanding nitrogen evolution and efficient biomass utilization.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Xin Li, Zhimin Lu, Jinzheng Chen, Xiaoxuan Chen, Yuan Jiang, Jie Jian, Shunchun Yao
Summary: The study demonstrates that oxidative torrefaction (OT) affects the combustion process of wood spheres, increasing char yield and combustion time while forming a more cross-linked aromatic structure that hinders volatile release, resulting in denser and heavier char particles. The findings suggest that mass yield serves as a good indicator for both OT and traditional inert torrefaction processes.
Article
Metallurgy & Metallurgical Engineering
Ya-jie Wang, Hai-bin Zuo, Jun Zhao, Guang-wei Wang
Summary: The study showed that the gasification reactivity of coal chars is influenced by coal rank and carbonaceous structure, with higher coal ranks leading to lower gasification reactivity and higher reaction orders.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Chemistry, Physical
Athanasios Lampropoulos, Georgios Varvoutis, Miguel A. Montes-Moran, J. Angel Menendez, Michalis Konsolakis, George E. Marnellos
Summary: The dry gasification process of solid fuels is a promising pathway for utilizing captured CO2 emissions. The study conducted comprehensive analysis and modeling for olive kernel and lignite coal chars gasification using pure CO2 as gasifying agent. The reactivity and kinetics of the gasification reactions were examined and correlated with the physicochemical properties of the chars. The activation energy values and gasification mechanism were also determined.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Applied
A. Galvez-Perez, M. A. Martin-Lara, M. Calero, A. Perez, P. Canu, G. Blazquez
Summary: This study found that both hydrolysed and raw olive cake samples are high-quality gasification feedstock to achieve good gasification performance at relatively low temperatures.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Jinzheng Chen, Zhimin Lu, Jie Jian, Zhengyan Bao, Jianfeng Cai, Shunchun Yao
Summary: Torrefaction pretreatment significantly affects the physicochemical characteristics of pyrolyzed char from cellulose, xylan, and lignin in lignocellulosic biomass. The torrefaction temperature strongly influences the char's yields, oxidative reactivities, and physicochemical structure. The accumulated char yield and reactivity show different sensitivity to the torrefaction temperature depending on the constituents, with a decreasing deviation from 2.4 wt% to 0.6 wt% as the torrefaction temperature increases. Raman spectra demonstrate a strong correlation between the relative amount of small and large aromatic rings and the accumulated char yield of torrefied samples, with high determination coefficients for cellulose, xylan, and lignin.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Thermodynamics
Hongli Fan, Fenghai Li, Meiling Xu, Mingxi Guo, Qianqian Guo, Guopeng Han
Summary: The combined study of ash fusion temperature adjustment and gasification reactivity change provides valuable reference for biomass utilization. Jincheng coal fine char (JF) was found to effectively increase the ash fusion temperatures of peanut hull and cotton stalk through conversion of K-containing minerals. However, JF exerted adverse effects on the gasification reactivity of both biomass, with stronger effects at high JF ratios and low temperatures. The influence of JF on gasification reactivity was lower for cotton stalk due to its higher ash yield and K2O content.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Yuhong Qin, Yanyun He, Weiping Ren, Mengjiao Gao, Tomasz Wiltowski
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Chemistry, Applied
Xing-Bao Wang, Zi-Zheng Xie, Liang Guo, Zhen-Yi Du, Wen-Ying Li
Summary: This study investigates the mechanism of dibenzofuran hydrodeoxygenation on the Pt(111) surface using density functional theory calculations. The results show that the five-membered-ring opening of tetrahydrodibenzofuran is easier than that of hexahydrodibenzofuran, leading to the formation of 2-cyclohexylphenol through a nonconsecutive hydrogenation pathway and multiple radical species. The investigation suggests that the target product bicyclohexane is most likely formed through a radical intermediate during the hydrodeoxygenation of dibenzofuran on the Pt(111) surface, providing valuable theoretical guidance for designing new catalysts in coal to liquid hydrodeoxygenation.
Review
Chemistry, Multidisciplinary
Antony Rajendran, Hong-Xia Fan, Jie Feng, Wen-Ying Li
CHEMISTRY-AN ASIAN JOURNAL
(2020)
Article
Energy & Fuels
Chong He, Fang Cao, Yuexing Wei, Zibing Zhao, Liping Cui, Yuhong Qin, Stanislav V. Vassilev, Christina G. Vassileva
Summary: The gasification behavior of coal and rice straw differs when gasified separately, but during co-gasification, the presence of rice straw particles promotes the shrinkage of coal particles due to their abundant alkaline components. The ash fusion mechanism of coal is characterized by a "softening-melting" process, while rice straw follows a typical "melting-dissolution" mechanism.
Article
Engineering, Chemical
Yi Huang, Jie Feng, Chang-Hai Liang, Peng Huang, Xiang-Wen Zhang, Qiang Xie, Wen-Ying Li
Summary: The efficient transformation of medium- and low-temperature coal tar into high-performance fuel and value-added chemicals has been achieved through an innovative coal tar processing process. A matrix of model compounds was used to represent the coal tar and hydrogenation products in order to optimize process parameters through kinetics modeling. The energy efficiency and element utilization associated with the entire process were calculated, and the energy use, CO2 emission, and target costing of the proposed coal tar process were evaluated through life cycle assessment.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Xiao Chen, Xing-Bao Wang, Shuhua Han, Dong Wang, Chuang Li, Weixiang Guan, Wen-Ying Li, Changhai Liang
Summary: This study reports a significant enhancement of intermediate selectivity and stability in the hydrogenation of anthracene over an irreducible SiO2 supported Pt catalyst due to SMSI-induced formation of intermetallic Pt silicide and Pt-SiO2 interface. The isolated Pt active sites by Si atoms lead to a preferential transfer of activated H species to the outer ring of anthracene, resulting in a high yield of symmetric octahydroanthracene. Furthermore, the Pt2Si/SiO2 catalyst shows excellent stability and broadens the understanding of SMSI effect in irreducible oxide supported metal particle catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Energy & Fuels
Chong He, Jin Bai, Lingxue Kong, Xiaoming Li, Jing Guo, Zongqing Bai, Yuhong Qin, Wen Li
Summary: The study investigated the effect of iron valence on the fusion behavior of synthetic coal ash. Results showed that the addition of metallic iron decreased the initial melting temperature of the ash by facilitating low-temperature eutectic reactions. The presence of Fe2+ in low-calcium ash promoted eutectic reactions in the Si-Fe-O system, while in high-calcium ash, the abundant calcium hindered the transition of Fe3+ to Fe2+, leading to an increase in initial shrinkage temperature.
Article
Green & Sustainable Science & Technology
Antony Rajendran, Hong-Xia Fan, Tian-You Cui, Jie Feng, Wen-Ying Li
Summary: This study reported a novel preparation method for oxidative desulfurization catalysts, which involves the hydrothermal synthesis of mesoporous tin oxide-supported octamolybdates and exhibits higher turnover frequency in the oxidative desulfurization reaction. This catalytic system shows promise in contributing to the establishment of an SOx-free environment.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Yuefeng Wang, Shugang Guo, Fang Cao, Chong He, Yuexing Wei, Yuhong Qin, Yanyun He, Xing Du, Stanislav V. Vassilev, Christina G. Vassileva
Summary: Water washing is an efficient method to alleviate ash-related problems in large-scale biomass gasification by reducing the concentrations of ash-forming elements. It can reduce ash deposition, corrosion, fouling, acid gas emission, and other issues caused by volatile ash-forming elements in biomass.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Crystallography
Ze Li, Jie-Ying Jing, Zhi-Qiang Qie, Wen-Ying Li
Summary: Jet fuel rich in hydroaromatics and cycloalkanes can be derived from direct coal liquefaction oil through the hydrogenation saturation process. An efficient catalyst, Ni2P/Al2O3, with high selectivity in transforming naphthalene hydrocarbons to hydroaromatics and cycloalkanes, was developed by the thermal decomposition of hypophosphite at different reduction temperatures. The results showed that the reduction temperature had a significant impact on the properties of the Ni2P/Al2O3 catalysts, and a reduction temperature of 400 degrees C yielded a catalyst with superior catalytic activity, attributed to smaller particle size, higher specific surface area, and suitable acidity.
Article
Chemistry, Analytical
Jieying Jing, Zemin Zhao, Xuewei Zhang, Jie Feng, Wenying Li
Summary: In this study, pulverized semi-coke was used to prepare activated carbon as a CO2 adsorbent via steam activation. The effects of preparation parameters on the structure and performance of the activated carbon were investigated. It was found that demineralization before activation greatly increased the microporous structure of the activated carbon, and pores smaller than 1 nm were favorable for CO2 sorption.
Article
Agricultural Engineering
Chong He, Yujia Du, Xingrui Cai, Jirui Wang, Yuhong Qin, Zibing Zhao, Huaizhu Li, Stanislav V. Vassilev, Christina G. Vassileva
Summary: The high contents of certain ash-forming elements in biomass ash can cause ash-related problems during co-gasification of coal and biomass, affecting gasifier operation. In this study, the sintering behavior of different ash mixtures was investigated and the sintering mechanism was revealed through phase studies. The results showed that the sintering temperature reached its minimum at a specific blending ratio of Jatropha seed cake ash in the coal-biomass ash mixture. The presence of specific crystalline phases and the transition of phosphorus from fluxing effect to refractory effect played important roles in the sintering process. These findings can be used for predicting the ash sintering temperature in coal-biomass gasifiers.
BIOMASS & BIOENERGY
(2023)
Article
Thermodynamics
Yuefeng Wang, Xingrui Cai, Shugang Guo, Chong He, Yuexing Wei, Yue Wang, Yuhong Qin, Stanislav V. Vassilev, Christina G. Vassileva, Yanyun He
Summary: The addition of biomass such as straw in the coal gasification process is one of the strategies for clean and efficient utilization of coal with decreasing CO2 emissions. However, the abundance of chlorine and alkaline metals contained in the corn straw is the key factor to aggravate the corrosion, deposition, and slagging of the co-gasifier. The effects of temperature (700-900 degrees C), residence time (2-12 min) and the addition ratios of corn straw on the migration behavior of Cl are studied during co-gasification of Shenmu coal and corn straw.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Environmental
Hongyu Niu, Xing-Bao Wang, Jingjie Luo, Jiaxin Liu, Chuang Li, Wen-Ying Li, Changhai Liang
Summary: This study investigates the C-S cleavage mechanism of dibenzothiophenes with or without steric hindrance under mild conditions. The reactive adsorption desulfurization mechanism on Pt/ZnO is proposed based on the adsorption model, Pt efficiency, and structural evolution of Pt active centers. By utilizing the interface between PtSx and ZnO, highly efficient cleavage of dibenzothiophenes (99.9% fracture) is achieved with or without steric hindrance (TOF = 15 h-1 or TOF = 128 h-1). This work has significant practical implications for the development of atmospheric industrial adsorbents for ultra deep reactive adsorption desulfurization.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Laisong Wang, Jie Feng, Yuncai Song, Wen-Ying Li
Summary: The study investigated the synergistic effects of co-gasification between coal and biomass at different blending ratios, temperatures, and contact conditions. The addition of biomass volatiles significantly enhanced the reaction performance of the blends, leading to more efficient synergy between the two types of particles. The study also showed that improving contact conditions and reducing particle distance could enhance synergy and improve gasification kinetics.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
