Article
Chemistry, Multidisciplinary
Hetong Li, Yuchun Zhang, Peng Fu, Ranran Wei, Zhiyu Li, Lei Dai, Andong Zhang
Summary: A type of nano NiO-Fe2O3/Al2O3 Fe-based OC was developed for glycerol CLSR, which can be easily reduced and re-oxidized. The study established optimal conditions and demonstrated improved cycle stability with the addition of Ni.
Article
Chemistry, Applied
Amit Mishra, Ryan Dudek, Anne Gaffney, Dong Ding, Fanxing Li
Summary: Supported nickel oxides are widely studied as oxygen carrier materials for chemical looping combustion and reforming of methane due to their high activity for methane conversion. However, coke formation remains a challenge for Ni-containing oxygen carriers. This study investigates the use of reducible, spinel-structured supports to enhance the coke resistance of NiO-based oxygen carriers.
Article
Energy & Fuels
K. Y. Kwong, A. R. P. Harrison, J. C. Gebers, J. S. Dennis, E. J. Marek
Summary: This research investigates the combustion of biomass char in fluidized beds using various particulate solids as either inert materials or oxygen carriers. The study finds that CuO and SrFeO3-delta release gaseous oxygen by thermal decomposition, while Fe2O3 competes with the combustion of biomass char for oxygen. The combustion time in the bed of Fe2O3 particles is similar to that in the inert bed of SiO2, despite the active role of iron oxide in the process.
Article
Energy & Fuels
K. Y. Kwong, A. R. P. Harrison, J. C. Gebers, J. S. Dennis, E. J. Marek
Summary: This research focuses on the combustion of biomass char in fluidized beds, finding that the oxygen carriers CuO and SrFeO3-δ have the best performance in accelerating combustion rate.
Article
Chemistry, Physical
Hessamodin Nourbakhsh, Yasin Khani, Akbar Zamaniyan, Farzad Bahadoran
Summary: CeZr0.5GdO4 spinel particles are introduced as oxygen carriers for methane reforming and decomposition, showing high activity and stability for continuous production of hydrogen and carbon monoxide with minimal CO2 and H2O emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Felix Donat, Agnieszka Kierzkowska, Christoph R. Muller
Summary: In chemical looping, using Fe and Co as the main and side reaction metals can effectively reduce the extent of carbon deposition and improve the catalytic effect of oxygen carriers on methane decomposition.
Article
Chemistry, Multidisciplinary
Shubo Chen, Wenguo Xiang, Shiyi Chen
Summary: Based on the density functional theory, a microscopic model of metal Fe, Al-doped NiO was established to study its effects on the performance of chemical looping combustion. The results showed that the Al-doped surface reduced the intermediate state energy and reaction energy, enhanced the activity of NiO surface, suppressed carbon deposition, and promoted subsequent reactions.
Article
Thermodynamics
Rei-Yu Chein, Cheng-Yang Lu, Wei-Hsin Chen
Summary: Syngas production based on chemical looping reforming was experimentally studied using a fixed-bed reactor. The results showed that efficient methane reforming and hydrogen production can be achieved under different reaction conditions.
Article
Chemistry, Physical
Negar Manafi Rasi, Alexander S. Hyla, Sathish Ponnurangam, Nader Mahinpey
Summary: This study investigates the synergetic effect of using TiO2 as a support for NiO in reaction with hydrogen fuel. The results show that the electronic interaction between TiO2 and NiO lowers the energy of intermediate states and the reaction energy, while the presence of more O vacancies created by TiO2 enhances the reactivity of the NiO-hydrogen reaction. This work provides insights into differentiating the electronic and geometric effects, contributing to the rational design of oxygen carriers and support systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Energy & Fuels
Arturo Cabello, Teresa Mendiara, M. Teresa Izquierdo, Francisco Garcia-Labiano, Alberto Abad
Summary: This study investigated the use of a low-cost Fe-based residue as an oxygen carrier in the Chemical Looping Combustion (CLC) and Chemical Looping Reforming (CLR) processes with biogas. The results showed that the methane combustion efficiency in the CLC process was higher (around 86%) compared to other low-cost Fe-based materials. The dry reforming of biogas in the CLR process achieved about 55% methane conversion and a yield of 1.3 mol (CO + H2)/mol CH4 for syngas production.
Article
Engineering, Environmental
R. Jovanovic, E. J. Marek
Summary: The study introduces a new modelling approach for the reduction of hematite to magnetite, a crucial reaction in atmospheres with high CO2/CO ratios. The model successfully predicts the reduction behavior of materials with different structures, providing valuable insights into the complexity of the investigated process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Amr Abdalla, Mansour Mohammedramadan Tijani, Mohanned Mohamedali, Nader Mahinpey
Summary: This study investigated the effects of introducing WO3 into NiO/ZrO2 oxygen carriers for methane CLC, and found that the dual metal oxide oxygen carriers exhibited enhanced oxygen capacity and lower carbon formation compared to their monometallic counterparts. The introduction of WO3 into the NiO/ZrO2 lattice structure led to the formation of an intermediate phase (NiWO4) which improved oxygen carriers' reducibility and metal dispersion. Impregnation synthesis method showed superior performance in terms of cyclic stability and coking resistance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Thermodynamics
Ahmed F. Ghoniem, Zhenlong Zhao, Mruthunjaya Uddi
Summary: This paper investigates the reaction kinetics of NiO supported on YSZ as an oxygen carrier for chemical looping combustion. The study examines the reactivity and oxygen carrying capacity of NiO/YSZ in a fixed bed reactor under different temperatures and concentrations of reactive gases. The results demonstrate that NiO/YSZ exhibits excellent cyclic regenerability and improved kinetics and oxygen utilization compared to pure nickel. The study also develops global models for oxidation and reduction processes, highlighting the effects of surface chemistry and solid diffusion.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Fanrui Meng, Jianshe Li, Xianchun Li, Huanran Wang, Yuejun Liu
Summary: The characteristics of chemical looping hydrogen generation using sewage sludge and corncob as fuel were investigated. The reduction depth and catalytic reaction mechanism of CuO-Fe2O3 oxygen carrier were analyzed. The adsorption properties of C molecules on CuFe2O4 surface were simulated using DFT.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Yi Wang, Liang Ma, Wei Li, Angela M. Deibel, Wenyuan Li, Hanchen Tian, Xingbo Liu
Summary: This study presents a well-functioning mixed-potential CO sensor using nickel oxide as the sensing material, capable of operating at high temperatures. The sensor exhibits notable and fast responses to 1000 ppm CO, and its sensing mechanism is attributed to the inverse reactions of CO reduction coupled with oxygen evolution. These findings enhance our understanding of CO sensing mechanisms for mixed potential sensors and suggest possibilities for expanding their working temperature limit in practical combustion control systems.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Thermodynamics
Gongxiang Song, Dexin Huang, Hanjian Li, Xuepeng Wang, Qiangqiang Ren, Long Jiang, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: A concentrated Photo-thermal TGA reactor (Pt-TGA) was used to investigate the gas generation characteristics and kinetics mechanism of biomass pyrolysis at fast heating rates. The study revealed the production of non-condensable gases and the increase in H-2 yield during pyrolysis, and the influence of heat and mass transfer on the reactions. Kinetic analysis indicated that the pyrolysis of biomass particles was controlled by a three-dimensional diffusion model.
Article
Energy & Fuels
Mengxia Qing, Siyuan Lei, Fanhai Kong, Liang Liu, Wei Zhang, Lele Wang, Tingting Guo, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: The generation and deposition of ammonium bisulfate in flue gas can cause serious blockage and corrosion to the air preheater, which poses a significant threat to the safe and economic operation of coal-fired power plants. Experimental results show that the generation and deposition of ammonium bisulfate/ammonium sulfate are influenced by the concentration of SO3 and NH3, the ratio of SO3 to NH3, and the deposition temperature.
Article
Energy & Fuels
Zhe Xiong, Zhou Fang, Long Jiang, Hengda Han, Limo He, Kai Xu, Jun Xu, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study investigated the effects of initial bio-oil production conditions on the steam reforming of bio-oil. The results showed that the biomass particle size had a significant impact on the tar yield, while the bio-oil production temperature and oligomer content also influenced the tar yield to some extent. In addition, the biomass particle size affected the gas yields from steam reforming, while the content of organics in bio-oil played a significant role in determining the gas yields.
Article
Chemistry, Applied
Yuanjing Chen, Syed Shatir A. Syed-Hassan, Qiaoling Li, Zengtong Deng, Xun Hu, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: Heterogeneity in char is almost inevitable in the pyrolysis of biomass pellet due to intra-particle mass/heat transfer limitation. This study investigated the effects of temperature and aspect ratio of cylindrical sawdust pellet on the heterogeneity of char structure. A heterogeneity index was proposed to quantify the degree of heterogeneity. Results showed that heterogeneity exists in both radial and axial directions and can be weakened by increasing temperature or enlarging the variance between radius and height of the pellet. The heterogeneity index decreased with increasing surface-area-to-volume ratio.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Peng Ling, Jun Xu, Tao Liu, Xiaoxue An, Xin Wang, Mohamed E. Mostafa, Hengda Han, Kai Xu, Long Jiang, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: This study investigated the pyrolysis kinetics and pyrolytic products distribution of coal slime and compared it with raw coal. The results showed that the pyrolysis of coal slime consists of three reaction stages, with the decomposition of volatiles as the main stage. The presence of inorganic minerals significantly influenced the pyrolysis reaction, and the alkene content of pyrolysis products decreased while the contents of CO2 and aromatics increased in coal slime compared to raw coal. These findings provide theoretical and practical guidance for the efficient thermochemical conversion and utilization of coal slime.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Thermodynamics
Baihe Guo, Jingchao Zhang, Yanlin Wang, Xiaolei Qiao, Jun Xiang, Yan Jin
Summary: The use of fly ash to prepare aerogel support for CO2 adsorption was studied. The results showed that the aerogel support made from fly ash had good microscopic properties and achieved high adsorption capacity under certain conditions.
Review
Energy & Fuels
Xin Wang, Jun Xu, Peng Ling, Xiaoxue An, Hengda Han, Yifeng Chen, Long Jiang, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: This study investigated the characteristics of sewage sludge and coal slime combustion, finding that co-combustion had a positive effect on desulfurization. Proper blend ratios and temperatures could effectively suppress the emission of SO2. The evolution of S functional groups showed different patterns during co-combustion. Calcium played an important role in the process, reacting with SO2 to form intermediate solid products and retaining SO2 in the ash.
Article
Energy & Fuels
Abdulmajid Abdullahi Shagali, Song Hu, Hanjian Li, Huanying Chi, Haoran Qing, Jun Xu, Long Jiang, Yi Wang, Sheng Su, Jun Xiang
Summary: The heating rate has a significant impact on the pyrolysis process, especially for reactions involving the co-pyrolysis of biomass and plastic. The synergistic effects of the blend samples are concentrated in the main decomposition region, and the co-pyrolysis process requires less activation energy compared to the pyrolysis of plastic alone.
Article
Thermodynamics
Jing Zhou, Meng Zhu, Lei Chen, Qiangqiang Ren, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study aims to construct the performance analysis and system optimization methods of supercritical CO2 (S-CO2) coal-fired CHP plants with MEA-based post-combustion carbon capture and storage (CCS) that has adapted for various S-CO2 CHP cycles. Results show that exergy efficiency of S-CO2 DPR coal-fired CHP units at 0% and 100% heating loads (HL) are 43.22% and 46.21%, increasing by 9.81% and 1.01% compared with S-CO2 recompression CHP units, respectively.
Article
Chemistry, Physical
Kuan Du, Beichen Yu, Yimin Xiong, Long Jiang, Jun Xu, Yi Wang, Sheng Su, Song Hu, Jun Xiang
Summary: Bio-oil emulsions were stabilized using solid emulsifiers such as coconut shell coke, modified amphiphilic graphene oxide, and hydrophobic nano-fumed silica. The stability of the emulsions was influenced by the particles used. The emulsion stabilized by Ni/SiO2 showed potential for catalytic hydrodeoxygenation of bio-oil, inhibiting the polymerization reaction and promoting the conversion of phenolic compounds.
Article
Engineering, Chemical
Jialin Zhang, Song Hu, Yong Ding, Rui Huang, Qiangqiang Ren, Sheng Su, Yi Wang, Long Jiang, Jun Xu, Jun Xiang
Summary: In this study, a hydrothermal-carbonization method was utilized to process waste biomass, resulting in the production of high-value carbon aerogels. The banana peel-based carbon aerogel showed the best performance in ethanol cracking, achieving a hydrogen yield of 41.86%. The enhanced ethanol cracking was attributed to the abundant pores in the carbon aerogel, which extended the residence time, and the presence of inorganic components (such as Ca, Mg, and K) on the surface of the aerogel, which promoted bond-breaking and reorganization in ethanol.
Review
Engineering, Chemical
Chong Tao, Limo He, Xuechen Zhou, Hanjian Li, Qiangqiang Ren, Hengda Han, Song Hu, Sheng Su, Yi Wang, Jun Xiang
Summary: This review discusses the characteristics and removal methods of volatile organic compounds (VOCs) in cooking oil fumes. The emission characteristics are influenced by cooking temperatures, cooking oils, and cuisines. Various purification methods, such as physical capture, chemical decomposition, and combination methods, are compared based on VOC removal rate, operability, secondary pollution, application area, and cost. The catalytic combustion method, particularly with noble metal and non-noble metal catalysts, shows high efficiency, environmental friendliness, and low cost.
Article
Engineering, Environmental
Mengxia Qing, Linlin Zhang, Liang Liu, Yaxin Chen, Yunda Su, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: SiO2 doping improves the de-NOx activity of MnCe/Ti catalysts at high temperatures and enhances their sulfur resistance at wide temperatures.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Samy Berthold Engamba Esso, Qunshan Yan, Zhe Xiong, Xun Hu, Jun Xu, Long Jiang, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study highlights the significance of plastic volatiles in the interactions between char and volatiles during co-pyrolysis of poly-propylene and biomass components. The interactions between char and volatiles affected the yield and chemical structure of PP-oil and biochar, with O-containing and aromatic species in biochar playing an active role. The study also found that different temperature conditions influenced the role of tarry and waxy materials in the char-volatiles interactions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Yiran Wang, Zhanming Zhang, Shu Zhang, Yi Wang, Song Hu, Jun Xiang, Tao Wei, Shengli Niu, Xun Hu
Summary: The coking behavior of a reforming catalyst is affected not only by the nature of metal species, but also by the properties of the carrier. Lewis acidic sites in the carrier can induce polymerization reactions, leading to the formation of polymeric coke and catalyst deactivation. Other forms of coke, such as carbon nanotubes, have less impact on catalyst activity.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)
