Article
Engineering, Environmental
Jinchen Ma, Daofeng Mei, Chaoquan Wang, Xin Tian, Zhaohui Liu, Haibo Zhao
Summary: This study investigated the fate of sulfur during in-situ gasification chemical looping combustion of coal, highlighting the resistance of Fe2O3/Al2O3 to sulfur and the positive effects of temperature and oxygen/fuel ratio on the conversion of sulfur compounds. Additionally, the research demonstrated the desulfurization function of coal ash and the effective conversion of sulfur-containing gases into SO2 using oxygen carrier materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Huan Zhou, Guoqiang Wei, Qun Yi, Zheming Zhang, Yingjie Zhao, Yuke Zhang, Zhen Huang, Anqing Zheng, Kun Zhao, Zengli Zhao
Summary: Chemical looping gasification (CLG) of Yunnan lignite with Fe-Mn mixed oxygen carriers (OCs) was conducted to produce high-purity synthesis gas and reduce pollutant emissions. The Fe-Mn composite OCs exhibited oxygen decoupling characteristics and synergistic effects between active components, making them suitable for the gasification process.
Article
Biotechnology & Applied Microbiology
Zhen Fan, Neng Huang, Kunlei Liu
Summary: Chemical looping combustion (CLC) is a fuel combustion technology that has less energy penalty for CO2 removal. This study systematically analyzes the feasibility of autothermal operation in CLC and discusses the selection of oxygen carrier, capacity and impact of support materials, circulation rate, heat-up feeds, aeration gas, reaction kinetics, and CLC operation, aiming to provide insights and approaches for the development of oxygen carriers.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2023)
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Thermodynamics
Haodong Huang, Jinchen Ma, Haibo Zhao, Chuguang Zheng
Summary: This work investigates the behavior of coal-derived chlorine in chemical looping combustion (CLC) and the potential adverse impacts of primary gaseous chlorine (HCl) on a Cu-based oxygen carrier (OC). The inactivation mechanism of the sol-gel-derived CuO/Al2O3 OC is studied. It is found that HCl is the main gaseous chlorine in coal CLC and shows high reactivity towards CuO. The presence of HCl can result in corrosion and degradation of the OC.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Applied
Yunchang Dong, Yanan Wang, Jinchen Ma, Hengfeng Bu, Chuanbao Zheng, Haibo Zhao
Summary: In this study, composite oxygen carriers were prepared using extrusion-spheronization method with fine iron and copper ores as raw materials and inert aluminosilicates as binders. After optimization, the oxygen carriers showed good performance in terms of reactivity and stability, indicating the suitability of the method for large-scale preparation of oxygen carrier particles.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Cao Kuang, Shuzhong Wang, Song Lv, Jianjun Cai, Ming Luo, Jun Zhao
Summary: Cu-based oxygen carriers modified by iron ore and chrysotile showed enhanced performance in in-situ gasification and chemical-looping with oxygen uncoupling processes, improving energy conversion efficiency, stability, and high-temperature tolerance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Shouxi Jiang, Laihong Shen, Jingchun Yan, Xin Niu, Bin Hu, Lingchang Wang
Summary: This study investigated the effects of sodium on coal combustion and NOx emissions in Zhundong coal. The results showed that water-soluble sodium had negative effects on coal conversion and NO generation during traditional combustion. However, when chemical looping was applied to Zhundong coal combustion, the NO emission was largely restrained and mainly came from pyrolysis. Additionally, the gasification agent facilitated NO generation and CO2 had a stronger effect on chemical looping.
Article
Energy & Fuels
Yanan Wang, Xin Tian, Haibo Zhao, Kunlei Liu, Yunchang Dong, Zhao Su, Chuguang Zheng
Summary: By using a combination of copper ore and red mud as oxygen carrier, better combustion performance was achieved in chemical looping combustion, with a synergistic effect observed between the two materials.
Article
Thermodynamics
Shiwen Fang, Zhengbing Deng, Yan Lin, Zhen Huang, Lixing Ding, Lisheng Deng, Hongyu Huang
Summary: This study explores the nitrogen migration law and control methods of nitrogen pollutants in the process of chemical looping gasification, providing important references for reducing nitrogen emissions.
Article
Energy & Fuels
Ashwani Kumar Dubey, Arunkumar Samanta, Pinaki Sarkar, Vinod Kumar Saxena
Summary: The study examined the effectiveness of CuO as an oxygen carrier in the chemical looping with oxygen uncoupling (CLOU) process using three Indian coals. It was found that the combustion reaction was most suitable at a mass ratio of 1:30 and 850 degrees C, with good repeatability over multiple cycles and minor agglomeration. Additionally, the kinetic analysis indicates that the combustion reaction kinetics is likely diffusion-dominated, with apparent activation energies in the range of 38.3-60.1 kJ/mol and 102.6-129.0 kJ/mol for different temperature zones.
Article
Energy & Fuels
Siqi Liu, Fang He, Kun Zhao, Haibo Zhao, Zhen Huang, Guoqiang Wei, Wen Yang
Summary: Coal chemical looping gasification (CCLG) is a promising technology with high resource utilization rate and environmental protection properties, requiring suitable oxygen carriers and optimized operating conditions for coal conversion and H2&CO production. This study tested a Cu-Fe bi-ore oxygen carrier and found that the optimal gasification conditions were at 950 degrees C with a oxygen carrier-to-coal mass ratio of 3:1 and steam rate of 0.08 ml/min, achieving a syngas yield of 58 mmol/g, 75.2% syngas selectivity, and 85.3% carbon conversion.
Article
Chemistry, Applied
Doki Yamaguchi, Liangguang Tang, Jose Orellana, Trevor D. Hadley, Sankar Bhattacharya, Kok-Seng Lim
Summary: The study developed a compact fully looped chemical looping reactor and found that the CLC performance increased with increasing operation time over 36 hours, as indicated by the increase in the CO2/CO molar ratio. The morphology changes and ash interaction of the Australian ilmenite did not noticeably affect the CLC performance or operation during continuous operation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Jinchen Ma, Xin Tian, Chaoquan Wang, Haibo Zhao, Zhaohui Liu, Chuguang Zheng
Summary: The study focused on the nitrogen conversion and distribution characteristics in the two elementary stages of coal conversion during the iG-CLC process. It was found that HCN was the dominant precursor of NOx in iG-CLC, and most NOx precursors were released during coal pyrolysis. The high CO2 concentration and reducing reaction atmosphere in the fuel reactor were found to inhibit the formation of NO.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
Xin Wu, Yunchang Dong, Jinchen Ma, Hengfeng Bu, Zhao Su, Laihong Shen, Haibo Zhao
Summary: In this study, a bimetallic oxygen carrier with good redox stability and sintering resistance is prepared in an industrial-scaled equipment. The oxygen carrier exhibits high combustion efficiency at high temperatures and shows potential for large-scale fluidized bed reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Shihai Cao, Hao Liu, Zhenhe Jia, Meng Guo, Wentong Gao, Zhaohan Ding, Weijie Yang, Liang Chen, Wenjing Wang
Summary: Amine-functionalized carbon nitride prepared by carboxylation and acylation reactions shows enhanced CO2 photoreduction efficiency due to increased CO2 adsorption capacity and reduced charge transfer resistance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Chang Liu, Zixun Yu, Fangxin She, Jiaxiang Chen, Fangzhou Liu, Jiangtao Qu, Julie M. Cairney, Chongchong Wu, Kailong Liu, Weijie Yang, Huiling Zheng, Yuan Chen, Hao Li, Li Wei
Summary: By constructing heterogeneous molecular catalysts using cobalt porphyrins and carbon nanotubes, the catalytic properties and activity were successfully modulated, resulting in sustainable production of hydrogen peroxide with high selectivity and activity.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Lulu Wen, Kang Sun, Xiaoshuo Liu, Weijie Yang, Luyan Li, Hai-Long Jiang
Summary: In this study, PdCu nanoparticles were encapsulated into a sulfonate functionalized metal-organic framework, UiO-66-SO3H, and their microenvironment was further modified by coating a hydrophobic polydimethylsiloxane (PDMS) layer. The resulting PdCu@UiO-S@PDMS catalyst exhibited high activity towards electrochemical nitrogen reduction reaction (NRR), surpassing other counterparts. Experimental and theoretical results revealed that the protonated and hydrophobic microenvironment provided protons for NRR and suppressed the competitive hydrogen evolution reaction, while the electron-rich PdCu sites favored the formation of the N2H* intermediate and reduced the energy barrier of NRR, contributing to its excellent performance.
ADVANCED MATERIALS
(2023)
Article
Engineering, Chemical
Cheng Shang, Zhijing Su, Song He, Zuwei Xu, Frank Einar Kruis, Haibo Zhao
Summary: This study combines computational fluid dynamics and population balance-Monte Carlo method (CFD-PBMC) to develop an accurate method for describing the spatiotemporal evolution and characteristics of dispersed systems. A efficient sub-model for particle migration is proposed to simulate the convection and diffusion processes. Several classical cases are simulated and compared with the classical weighted random walk method, showing good agreements except for radial migration. The measured speedups on the GPU are significantly higher compared to a standard high-performance computer, with a factor of about 450 for pure migration and about 50 for the CFD-PBMC method.
Article
Chemistry, Physical
Jingxue Wang, Kang Sun, Denan Wang, Xinwei Niu, Zhongyuan Lin, Siyuan Wang, Weijie Yang, Jier Huang, Hai-Long Jiang
Summary: The coordination environment around single Co sites in a UiO-type metal-organic framework is modulated to synthesize UiO-Co-N-x (x = 2, 3, and 4) catalysts for photocatalytic CO2 reduction. It is found that the photocatalytic performance is strongly influenced by the coordinated N atom number, with UiO-Co-N-3 exhibiting the highest activity. Photo-/electrochemical results confirm the fastest charge transfer kinetics between the photosensitizer and UiO-Co-N-3. Theoretical calculations and in situ diffuse reflectance infrared Fourier transform spectra reveal that UiO-Co-N-3 has the lowest energy barriers for the rate-determining step and desorption energy of CO* among all UiO-Co-N-x samples.
Article
Agricultural Engineering
Francisco M. Baena-Moreno, Daofeng Mei, Henrik Leion, David Pallares
Summary: The calcium looping technology is a promising method for CO2 capture and storage. Previous studies have focused on evaluating this technology using combustion flue gas, while little is known about its performance when capturing CO2 from biogas or gases resulting from hydrothermal carbonization. This experimental study assesses the performance of calcium looping for biogas and finds improved CO2-capture performance compared to combustion flue gas.
BIOMASS & BIOENERGY
(2023)
Article
Energy & Fuels
Xinyi Chen, Guangsheng Zou, Yanliang Yuan, Zuwei Xu, Haibo Zhao
Summary: The research investigates the use of Ni-doped nano-Fe/Ce oxygen carriers for the chemical looping dry reforming of methane. Thermodynamic analysis and reaction simulation are conducted on the CL-DRM process with iron-based oxygen carriers. The experimental results show that the Ni-doped Fe/Ce oxygen carriers achieve high performance and stable cyclic stability due to the high dispersion of Ni and the transformation of Fe oxides and CeO2.
Article
Energy & Fuels
Weijie Yang, Binghui Zhou, Liugang Chen, Ruiyang Shi, Hao Li, Xiaoshuo Liu, Zhengyang Gao
Summary: In this study, the catalytic activity of single-atom cobalt catalysts for the oxidation of NO and Hg0 was improved by doping different p-block elements to regulate the coordination environment. The adsorption energy of O2 and O was calculated to analyze the catalytic activity performance, and four potentially high-activity catalysts were identified. Microkinetic modeling was used to calculate the turnover frequency (TOF) of these catalysts, and the results showed that adjusting the coordination environment of the active metal center significantly improved the catalytic activity of single-atom catalysts in the oxidation of NO and Hg0.
Article
Energy & Fuels
Daofeng Mei, Anders Lyngfelt, Henrik Leion, Tobias Mattisson
Summary: Chemical looping combustion (CLC) is a technology that can generate heat and power while capturing CO2. Using biomass in CLC (bio-CLC) allows for negative CO2 emissions. This study investigates the interaction between alkalis in biomass and the process, focusing on charcoal impregnated with alkali chlorides. The results show that impregnation with alkalis improves the gasification rate, with carbonates resulting in earlier and more permanent defluidization compared to chlorides. Partial agglomeration and retention of alkalis in the oxygen carrier are observed, with similar reactivity noticed with CH4 and H2.
Article
Green & Sustainable Science & Technology
Daofeng Mei, Ivan Gogolev, Amir H. Soleimanisalim, Anders Lyngfelt, Tobias Mattisson
Summary: The steel slag from the Linz-Donawitz process, known as LD-slag, was investigated as an oxygen carrier in a chemical-looping combustor with biomass fuels. Heat treatment at high temperatures was required to improve operability. The results showed that with LD-slag as the oxygen carrier, a lower oxygen demand could be achieved with high solids circulation.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Chemistry, Physical
Weijie Yang, Liugang Chen, Binghui Zhou, Zhenhe Jia, Xiaoshuo Liu, Yanfeng Liu, Hao Li, Zhengyang Gao
Summary: In this study, the combination of single-atom catalysts and H2O2 as an oxidant is proposed for the catalytic oxidation of nitrogen oxide (NO). The reaction pathways for NO oxidation using H2O2 were determined through theoretical calculations and modeling, with *OOH identified as the most favorable pathway with the highest reaction rate and *HNO3 as the main oxidation product. Compared to conventional oxidants and catalysts, using H2O2 on Fe-N-4-C catalyst lowers the reaction energy barriers and enables the deep oxidation of NO. This research provides valuable insights for the development of materials for NO removal.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Weijie Yang, Zhenhe Jia, Binghui Zhou, Liugang Chen, Xunlei Ding, Long Jiao, Huiling Zheng, Zhengyang Gao, Qiang Wang, Hao Li
Summary: Surface states of typical homonuclear and heteronuclear DACs were probed, and spin-polarized density functional theory calculations were conducted to explore the CO2RR reaction mechanisms. The study reveals the difficulty in C-C coupling on DACs and provides insights into enhancing the selectivity and activity of the CO2RR.
Review
Engineering, Environmental
Yuru Liu, Ke Yin, Jiawei Wu, Daofeng Mei, Jukka Konttinen, Tero Joronen, Zhifeng Hub, Chao He
Summary: This review systematically analyzes the impact of ash compositions on the oxygen carrier in the chemical looping process (CLP), providing insights into the agglomeration and melting process caused by ash deposition. Strategies are proposed to mitigate the adverse effects of ash and recycle useful metals.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Wenfeng Fu, Kanghai Yu, Hao Song, Kai Zhang, Weijie Yang
Summary: A new descriptor was proposed in this study to accelerate the evaluation of different amine pairings and successfully establish a relationship between hydrogen bond strength and reaction energy barrier, providing theoretical guidance for the design of mixed amines.
Article
Chemistry, Physical
Weijie Yang, Liugang Chen, Zhenhe Jia, Binghui Zhou, Yanfeng Liu, Chongchong Wu, Zhengyang Gao
Summary: This study investigated the reaction pathways of NO oxidation with OH radicals over eight types of single-atom catalysts (SACs) through spin-polarized density functional theory calculations. Fe-N4-C was found to have the highest reaction rate among the SACs studied, indicating its potential for efficient catalytic oxidation of NO at room temperature. The catalytic activity of NO oxidation using OH radicals was found to be higher than that using O2 for the SACs system, as demonstrated by the catalytic reactions plotted on the unified volcano map.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
