Article
Engineering, Environmental
Fangjun Wang, Shiyi Chen, Shubo Chen, Jun Du, Lunbo Duan, Wenguo Xiang
Summary: This study developed a series of Ni and Co doped CeO2/La2Ni2-xCoxO6 double perovskite composite oxygen carriers for chemical looping steam methane reforming (CL-SMR), achieving the co-production of syngas and hydrogen. The introduction of Co increased surface active sites, accelerating the activation of CH4, while the addition of Ni provided oxygen vacancies to promote oxygen migration. The optimal substitution ratios were 0.6 for cobalt and 1.4 for nickel. The CeO2/La2Ni1.4Co0.6O6 sample showed excellent syngas selectivity (95%) and high methane conversion (86%) at 850 degrees Celsius, with close to 100% hydrogen concentrations in the steam oxidation stage. DFT calculations demonstrated the strongly exothermic partial oxidation of methane, and the CeO2-loaded double perovskite was more conducive to CH4 activation and prevented carbon deposition. The Ni-Co synergistic effect greatly promoted the partial oxidation of methane, and the reduced metals combined with oxygen vacancies provided active stable points for water vapor cracking to generate high-purity hydrogen.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Shiwei Ma, Fang Cheng, Junguang Meng, Huijun Ge, Ping Lu, Tao Song
Summary: The feasibility of using Ni-enhanced red mud in chemical looping steam methane reforming (CL-SMR) was evaluated. It was found that the Ni-enhanced red mud displayed desirable reactivity and cyclic stability, with CO selectivity reaching 94.1% and H-2/CO ratio of 2.01 at the most suitable temperature of 900 C. The Ni species effectively activated the C-H bond of methane and facilitated the transfer of lattice oxygen.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Dingshan Cao, Haoran Ding, Cong Luo, Fan Wu, Xiaoshan Li, Liqi Zhang
Summary: In this study, cordierite monolith reactors coated with Ba1-xSrxCoO3-delta/CeO2 were prepared for chemical looping steam methane reforming (CL-SMR). The introduction of honeycomb ceramics effectively inhibited methane pyrolysis and carbon deposition, ensuring the H2/CO ratio of syngas was close to the theoretical value of 2. Results showed that the novel cordierite monolith reactor coated with perovskite oxide provided a promising oxygen carrier choice for the industrial application of CL-SMR.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Haoran Ding, Yonggang Jin, Stephen C. Hawkins, Liqi Zhang, Cong Luo
Summary: This study prepared CeO2-supported BaCoO3-δ oxygen carriers with different component distributions and evaluated their performance in CL-SMR. Among them, the sol-gel sample showed the best performance with a close-to-ideal H2/CO ratio of 2 and high syngas and hydrogen production.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Environmental
Sunkyu Kim, Leelavathi Annamalai, Raul F. Lobo
Summary: The combination of methane dehydroaromatization (MDA) and chemical looping (CL) combustion of hydrogen can overcome the thermodynamic constraints limiting conversion. The development of selective hydrogen-oxidation oxygen carriers in the CL is crucial for improving MDA performance. A novel oxygen carrier, silica-encapsulated Fe2O3, demonstrated high overall methane conversion and aromatics yield in a recirculating system. The silica layer prevented aromatics diffusion and promoted hydrogen transport and oxidation, while close physical contact between iron oxide particles and silica facilitated hydrogen conversion without full depletion of iron oxides.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Kun Zhao, Xiaojie Fang, Chaoxian Cui, Shunshun Kang, Anqing Zheng, Zengli Zhao
Summary: A novel composite oxide carrier of CeO2/La0.9Sr0.1Fe1-xNixO3 with varying doping ratios of Ni has been developed to achieve selective and stable production of syngas and hydrogen. The results show that the proper Ni doping ratio significantly enhances the carrier's performance and stability, while avoiding carbon deposition.
Article
Engineering, Chemical
Jon Powell, Suwimol Wongsakulphasatch, Rungrote Kokoo, Nichamon Noppakun, Chaiwat Prapainainar, M. A. A. Aziz, Suttichai Assabumrungrat
Summary: The study investigated the impact of operating conditions on hydrogen production and process thermal efficiency for the SE-CL-SMR process, finding that factors such as CaO/C ratio, MeO/C ratio, and oxidising agent species play a significant role. The introduction of CaO reduces coke formation, while increasing MeO/C and S/C enhances hydrogen yield and purity. The presence of CuO allows for adiabatic reactor operation and an increase in NiO:CuO ratio leads to higher methane conversion rates.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Review
Energy & Fuels
Jiahui He, Qian Yang, Zhe Song, Wenxi Chang, Chuande Huang, Yanyan Zhu, Xiaoxun Ma, Xiaodong Wang
Summary: Chemical looping steam methane reforming (CL-SMR) is a promising technology for generating high-purity hydrogen. However, carbon deposition on iron-based oxygen carriers (OCs) hinders its efficiency. This study analyzes strategies for improving the carbon resistance of OCs, providing valuable guidance for designing perspective OCs for CL-SMR process.
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
Engineering, Environmental
Dingshan Cao, Cong Luo, Fan Wu, Liqi Zhang, Xiaoshan Li
Summary: Chemical looping steam methane reforming (CL-SMR) is a novel process using solid oxygen carriers to produce syngas and hydrogen from methane. This study screened perovskites and found LaFeO3-CeO2 as an optimal oxygen carrier with high hydrogen production, stable reaction performance, and high purity hydrogen. CeO2 loading provides lattice oxygen for syngas production and enhances hydrogen production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
Xinfei Chen, Luwen Wang, Yan Lin, Tao Zeng, Zhen Huang, Yongqi Zhang, Ya Xiong, Jun Li, Lisheng Deng, Hongyu Huang
Summary: Ca2Fe2O5/Zr0.5Ce0.5O2 exhibited excellent reactivity in chemical looping dry reforming of methane. The migration of lattice oxygen during redox process was explored, revealing the release of lattice oxygen, structural change, and crystalline phase transformation. The understanding of oxygen migration provides a reference for improving the cyclic stability of Ca2Fe2O5/Zr0.5Ce0.5O2.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zhifeng Hu, Zhenwu Miao, Jiawei Wu, Enchen Jiang
Summary: Ni/Fe modification of natural ores can improve the reactivity and stability of oxygen carrier for chemical looping steam methane reforming (CL-SMR), enhancing performance and inhibiting agglomeration, with the optimum steam to OC ratio being 0.05. The high ratio of iron to nickel may lead to sintering and decline in OC performance, while the optimal CH4 to OC ratio for highest performance is 0.04.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Hui-Xin Zhang, Zheng-Qing Huang, Bolun Yang, Chun -Ran Chang
Summary: In this study, the oxygen migration properties of oxygen carriers (OCs) and the matching problem of oxygen migration rate with the methane dissociation rate were investigated using theoretical analysis. It was found that the migration rate of lattice oxygen and the dissociation of methane can be well matched at a low surface oxygen vacancy concentration, which is crucial for the selective production of syngas.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Haoran Ding, Sirui Tong, Zhifu Qi, Fei Liu, Shien Sun, Long Han
Summary: Chemical-looping steam methane reforming (CL-SMR) is a promising technology for syngas and hydrogen co-production. The performance of oxygen carriers in the partial oxidation of methane stage is crucial. This study investigated the performance of BaCoO3/CeO2 monolithic oxygen carrier for syngas production. The results showed that the oxygen carriers maintained ideal crystal structures and had a high gas-solid contact area.
Article
Chemistry, Applied
Zheng Cheng, Li Zhang, Nannan Jin, Yanyan Zhu, Lihua Chen, Qian Yang, Ming Yan, Xiaoxun Ma, Xiaodong Wang
Summary: The study investigated the effect of the interaction between CeO2 and BF3 during calcination on the performance of chemical looping dry reforming. It was found that CeO2/BF3 calcined at 900 degrees Celsius showed the best catalytic performance.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Xuezhu Li, Guiyuan Cai, Yongkui Li, Xing Zhu, Xianjin Qi, Xin Zhang, Bo Shu, Kongzhai Li, Yonggang Wei, Hua Wang
Summary: Using limonite as an in situ solid iron source promotes the crystallization of scorodite for effective arsenic removal from high-arsenic smelting wastewater. This method can precipitate 99.6% of arsenic in the wastewater as environmentally stable scorodite, with the residual arsenic concentration in the filtrate further reduced to 0.1 μg/L through additional treatment with fresh limonite.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Chunqiang Lu, Rongrong Deng, Ruidong Xu, Yannan Zhao, Xing Zhu, Yonggang Wei, Kongzhai Li
Summary: The CeO2/MnCo2O4 oxygen carrier significantly improves the redox stability for methane combustion in Chemical Looping Combustion (CLC). Among different compositions, the 10% CeO2/MnCo2O4 sample shows the highest stability during successive CLC testing, with a methane combustion capacity of 2.22 mmol/g and average methane conversion rate of over 90%.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Zhiyuan Yang, Yane Zheng, Kongzhai Li, Yajing Wang, Yuhao Wang, Hua Wang, Yaming Wang, Lihong Jiang, Xing Zhu, Yonggang Wei
Summary: A series of La-Mn-Fe-O perovskite oxides were successfully prepared and used for Chemical-looping reforming of methane. The La0.85MnFe0.15O3-800 showed better structural and thermal stability during 9 cycled reactions.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Electrochemistry
Heng Wang, Jianhang Hu, Kongzhai Li, Yu Wang, Feng Zhang, Hua Wang
Summary: The study investigated the effects of MPS, PEG, TU and ETU on copper electrodeposition and found that the additives have inhibitory effects on the process. MPS and PEG inhibit copper deposition through direct adsorption on the cathode surface, while TU and ETU inhibit it through complex intermediate reactions, resulting in flatter and finer-grained deposits. These findings suggest that TU and its derivatives are suitable additives for direct copper electrodeposition at low copper ion concentration.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Chemistry, Physical
Guixian Deng, Guifang Zhang, Xing Zhu, Qingjie Guo, Xiangbiao Liao, Xi Chen, Kongzhai Li
Summary: The modification of Ni-based catalysts by CeO2 and ZrO2 suppresses the negative effect of O-2, leading to high CH4 and CO2 conversion rates even at high temperatures. The interaction among Ni, CeO2, and ZrO2 results in well-dispersed Ni particles, contributing to long-term catalyst stability and high conversion rates.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Yanhui Long, Kun Yang, Zhenhua Gu, Shen Lin, Danyang Li, Xing Zhu, Hua Wang, Kongzhai Li
Summary: An efficient LaFeO3-based perovskite oxygen carrier doped with a small amount of Ni was designed to preferentially oxidize methane to syngas in COG, increasing the yield of H-2 from water splitting. Experimental and theoretical results demonstrate that the incorporation of Ni cations can greatly improve the activity and stability of the oxygen carrier, reducing the reaction temperature required.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Xianming Cheng, Zhenhua Gu, Fashe Li, Xing Zhu, Yonggang Wei, Min Zheng, Dong Tian, Hua Wang, Kongzhai Li
Summary: Chemical-looping combustion (CLC) is a promising technology for CO2 capture with low energy consumption, but carbon deposition from methane poses a challenge. This study investigated carbon formation behaviors of four typical oxygen carriers (OCs) and proposed a strategy to eliminate carbon by arranging them in a fixed-bed reactor. The findings show that NiO/ZrO2 OC is prone to carbon formation, while CuO/SiO2 OC has high CH4 conversion and minimal carbon formation. Mixing these OCs in a suitable sequence can significantly enhance CLC efficiency and resistance to carbon deposition.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Zhixu Lu, Xianjin Qi, Xing Zhu, Xuezhu Li, Kongzhai Li, Hua Wang
Summary: A method for treating high-arsenic wastewater using red mud was proposed for efficient arsenic removal; RM showed high arsenic removal capacity and stability in wastewater with varying concentrations; it has the potential to treat wastewater containing heavy metals and produce clean water for industrial purposes.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Applied
Zhiqiang Li, Xiangbo Feng, Zhenhua Gu, Chunqiang Lu, Danyang Li, Xing Zhu, Lei Jiang, Guixian Deng, Kongzhai Li
Summary: Adding NiO into CeO2-MgO oxygen carrier significantly enhances the activity for CH4 and CO2 conversion, especially at 800 degrees C. The addition of NiO also improves the selectivity and yield of CO. The formation of CeO2-NiO and NiO-MgO double solid solutions contributes to the stability of the oxygen carrier.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Wenming Liu, Le Li, Sixue Lin, Yiwei Luo, Zhenghong Bao, Yiru Mao, Kongzhai Li, Daishe Wu, Honggen Peng
Summary: Carbon dioxide and methane are major greenhouse gases contributing to global warming, but dry reforming of methane (DRM) can convert them into useful products. However, the coking formation on nickel-based catalysts is a challenge for industrialization. Confined indium-nickel intermetallic alloy nanocatalysts show superior resistance to coking in DRM, with the In0.5Ni@SiO2 catalyst demonstrating the best balance of carbon deposition resistance and reactivity. This study provides guidance on designing high-performance catalysts for methane dry reforming to utilize greenhouse gases efficiently.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Xiangbiao Liao, Yanhui Long, Yan Chen, Amirali Zangiabadi, Hua Wang, Qinggang Liu, Kongzhai Li, Xi Chen
Summary: A cyclic redox scheme with self-generated Ni nanoparticles/LaFeO3 heterogeneous structure was reported for efficient CO2 utilization at a low temperature of 800 degrees Celsius. The modified LaFeO3 sample showed stable and superior performance with high CO selectivity and CO2 conversion rates, even in the presence of impurities, over 100 redox cycles. The exsolved Ni metal nanoparticles on the perovskite surface served as catalytically active sites for methane conversion and activation of C-O bonds during CO2 reduction.
Review
Chemistry, Multidisciplinary
Dong Tian, Steven R. Denny, Kongzhai Li, Hua Wang, Shyam Kattel, Jingguang G. Chen
Summary: Transition metal carbides and nitrides, as interesting non-precious materials that can replace or reduce the loading of precious metals for catalyzing important electrochemical reactions, have attracted high interest from scientific communities. This review summarizes density functional theory studies, describes reaction pathways, identifies activity and selectivity descriptors, and provides a future outlook for designing carbide and nitride catalysts.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Physical
Kun Yang, Zhenhua Gu, Yanhui Long, Shen Lin, Chunqiang Lu, Xing Zhu, Hua Wang, Kongzhai Li
Summary: This study focuses on producing pure H-2 from coke oven gas (COG) using chemical looping reforming technology. La0.5Sr0.5FeO3 shows the highest methane conversion rate, hydrogen yield, and hydrogen purity among different perovskite oxides studied.
GREEN ENERGY & ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Hansheng Xiao, Hua Zhu, Wei Weng, Kongzhai Li, Wei Li, Wei Xiao
Summary: The conversion of carbon dioxide into a hydrogen-evolution electrocatalyst using a molten salt electrochemical method shows efficient modulation of thickness, adhesion, and interfacial confinement. The resulting Mo2C-Mo binder-free electrode displays enhanced electrocatalytic activity towards hydrogen evolution due to lower hydrogen adsorption energy at the Mo2C-Mo interface. This generic method integrates carbon dioxide fixation and surface carbonization of a metal to functional films.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Energy & Fuels
Yanhui Long, Zhenhua Gu, Shen Lin, Kun Yang, Xing Zhu, Yonggang Wei, Hua Wang, Kongzhai Li
Summary: Chemical looping combustion is a new combustion technology that can generate electricity and capture carbon dioxide for the long term. Research indicates that monolithic oxygen carriers exhibit better adaptability at high flow rates, and combining different orders of oxygen carriers can significantly enhance CH4 conversion and CO2 selectivity.
JOURNAL OF THE ENERGY INSTITUTE
(2021)