Article
Engineering, Chemical
Yun Li, Houfang Lu, Yingying Liu, Kejing Wu, Yingming Zhu, Bin Liang
Summary: In this study, nano-SiO2 was used to enhance CO2 absorption and desorption in high-viscosity DBU-glycerol solution. The effects of ultrasonic time, solids loading, and particle/cluster size of SiO2 on absorbent properties and absorption performance were investigated. The addition of nano-SiO2 significantly improved the absorption and desorption processes, by decreasing the average particle size and increasing the interfacial area between gas and liquid. The results showed that nano-SiO2 can effectively enhance both absorption and desorption processes in high-viscosity solutions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Eleana Harkou, Sanaa Hafeez, Panayiota Adamou, Zhien Zhang, Anastasios I. Tsiotsias, Nikolaos D. Charisiou, Maria A. Goula, S. M. Al-Salem, George Manos, Achilleas Constantinou
Summary: Greenhouse gas emissions are a major concern for scientists in mitigating global warming. The study focused on investigating different reactors and catalysts for CO2 methanation. 2D models were developed using CFD modelling methods, with good agreement between experimental and simulated results in a packed bed reactor. The coated wall reactor performed worse than the packed bed reactor, with approximately 30% difference in results due to lower residence time. Two membrane reactor configurations were proposed, and lower flow rates in the coated wall reactor resulted in higher conversion values. The optimal bed thickness was found to be 1 mm, and reducing the thickness of the membrane for CO2, H2, and H2O removal showed better conversion results.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Chemical
Helei Liu, Xiaotong Jiang, Raphael Idem, Shoulong Dong, Paitoon Tontiwachwuthikul
Summary: In this study, the kinetics of CO2 absorption in 1DMA2P solution were experimentally measured and a numerical kinetics model was developed. The model was validated by comparing with experimental data and showed a good agreement. The study provides an effective criterion for solvent screening.
Article
Engineering, Chemical
Ehsan Heidaryan, Ashkan Gouran, Kaveh Nejati, Babak Aghel
Summary: This article presents the successful CO2 capture in a continuous oscillatory baffled reactor for the first time. The impact of various operation variables and the constant baffle size and distance on CO2 capture was investigated. The results suggest that oscillations contribute to the enhancement of CO2 capture in the oscillating flow reactor. Moreover, the mixing intensity plays a crucial role in achieving efficient and stable CO2 capture. The study demonstrates that oscillating flow reactors can serve as effective liquid-gas contactors for CO2 capture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Qingyang Li, Zhenghong Bao, Novruz G. Akhmedov, Benjamin A. Li, Yuhua Duan, Malcolm Xing, Jingxin Wang, Badie Morsi, Bingyun Li
Summary: The study reveals that the addition of amino acids like glycine in potassium carbonate solvents can lead to carbamate formation, and amino acids significantly enhance the absorption rate of CO2. The mixed solvent of potassium carbonate and amino acids may be an ideal choice for CO2 removal.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Jiliang Ma, Jian Zhong, Xuebing Bao, Xiaoping Chen, Ye Wu, Tianyi Cai, Daoyin Liu, Cai Liang
Summary: A novel two-stage integrated bubbling-transport bed reactor was proposed for post-combustion CO2 capture using K2CO3/Al2O3 sorbents. The optimal adsorption temperature range was found to be between 60 degrees C and 100 degrees C, with wider range than traditional reactors. CO2 capture efficiency increased with sorbent circulation rate and desorption temperature, while better performance was observed with air desorption gas. Water vapor step-feeding enhanced maximum CO2 capture efficiency from 87% to 96% and showed strong anti-interference ability.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Zhoufeng Bian, Houchuan Xia, Wenqi Zhong, Bo Jiang, Yang Yu, Zhigang Wang, Kewei Yu
Summary: High hydrogen permeance is crucial for the positive effect of methanation reaction, while increasing pressure may decrease the conversion of CLH due to negative thermodynamic effect.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Athirah Mohd Tamidi, Kok Keong Lau, Siti Munirah Mhd Yusof, Nurulhuda Azmi, Shahidah Zakariya, Umar Patthi
Summary: Efficient carbon capture technology is crucial for achieving net-zero carbon emissions in the future. Ultrasonic irradiation can enhance the conventional CO2 absorption process by improving mixing and increasing gas-liquid mass transfer interface. This study investigates the performance of a continuous ultrasonic-assisted CO2 absorption process and identifies ultrasonic power as the most significant parameter affecting CO2 absorption performance. The results provide insights for optimizing CO2 absorption and demonstrate the effectiveness of ultrasonic irradiation.
Article
Engineering, Chemical
Thomas Pichler, Bernd Stoppacher, Alexander Kaufmann, Matthaeus Siebenhofer, Marlene Kienberger
Summary: The study experimentally validated the neutralization reaction of NaOH with CO2 in an airlift reactor, calculating the reaction rate based on the two-film theory and empirical equations. The experimental validation of the volumetric mass transfer coefficient, liquid phase circulation velocity, and gas holdup was performed, and a model for reaction rate and process efficiency was established with a deviation of 5%.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Engineering, Chemical
Xiaowen Zhang, Shangshang Zhang, Feiying Tang, Zhan Tan, Yi Peng, Sisi Zhao, Cong Xiang, Hongrui Sun, Fangfang Zhao, Kuiyi You, He'an Luo
Summary: Chemical absorption using aqueous tertiary amine solutions is a potential method for CO2 capture due to its high capacity and low energy consumption. However, the low CO2 absorption rate is a limitation for large-scale use. This study explored the use of five solid-base catalysts to enhance the absorption rate, with MgAl-layered double hydroxide (LDH) showing the highest catalytic activity. LDH improved the CO2 absorption rate by 92.7% compared to non-catalytic absorption. The catalytic effects of LDH were demonstrated through various techniques and a possible mechanism was suggested. This work opens up a new approach for developing solid-base catalysts to improve CO2 capture technologies.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Vahideh Alizadeh, Lars Esser, Barbara Kirchner
Summary: Deep eutectic solvents show promising potential as CO2 absorbents, contributing to sustainable CO2 reduction and combating global climate change. Molecular dynamics simulations provide insights into the CO2 absorption mechanism in the solvent, revealing varying interactions between different components and CO2 under different pressures.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Rouzbeh Ramezani, Renzo Di Felice
Summary: The study investigated the characterization and kinetics of CO2 absorption in potassium carbonate (K2CO3) solution promoted by diethylenetriamine (DETA). It was found that the addition of small amounts of DETA resulted in a significant enhancement in CO2 absorption rate, with a reaction order of 1.6 and an activation energy of 35.6 kJ mol(-1). DETA showed better performance compared to other promoters.
GREEN ENERGY & ENVIRONMENT
(2021)
Article
Thermodynamics
Jin Wang, Yimin Xuan, Jia Zeng, Qibin Zhu, Zhonghui Zhu
Summary: Proper design of a solar-driven photothermal catalytic reactor is proposed, which enables efficient CO2 reduction into solar fuels. A comprehensive numerical model, considering light harvesting, energy and mass transfer, and chemical conversion processes, is developed to analyze the effectiveness of the reactor and obtain the optimal design strategy. Methods are suggested to enhance the chemical reaction by controlling parameters such as light capture, radiation transfer, temperature field, and reactant supply in the catalyst layer. The designed reactor demonstrates outstanding catalytic performance with remarkable light absorptivity, energy confinement, and reactants enrichment characteristics.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Physical
Yonghui Wang, Subhasis Adhikari, Harmen van der Meer, Junyan Liu, Michel Orrit
Summary: Photothermal (PT) microscopy has great potential in imaging single absorbing nano-objects in soft matter and biological systems. In this study, we showed that the photothermal signal can be significantly enhanced by near-critical CO2, a cheaper alternative to xenon. The use of thin capillaries and COMSOL simulations further supported our experimental findings.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Chemical
Xin Liu, Yong-De Yan, Yun Xue, Yang-Hai Zheng, Wen-Da Xu, Yue-Lin Wang, Qing-Guo Zhang, Fu-Qiu Ma, Kai Zhu, Jing-Ping Wang
Summary: The radioactive spent resins from the nuclear power plant can leak radionuclide due to the generation of volatile substances during heat treatment. Molten salt oxidation (MSO) can prevent Co volatilization and facilitate sulfur removal from the resins. Ternary carbonate (Li2CO3-Na2CO3-K2CO3) and CaO were used as molten salt system and sulfur capture agent, respectively. The introduction of Co2+ promoted oxidation and the harmful gases were effectively absorbed by carbonate with CaO. Addition of CaO increased the retention rate of sulfur and Co2+ in waste salt at 800 °C. The enhanced molten carbonate system can efficiently treat Co-CERs and have potential applications in organic contaminant treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Qi Feng, Yanan Wang, Lei Wang, Wei Zhao, Moses Arowo, Lei Shao
SEPARATION SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Chemical
Taoran Liu, Dan Wang, Wei Wang, Qi Liang, Lei Shao
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Engineering, Chemical
Dan Wang, Taoran Liu, Lei Ma, Feng Wang, Lei Shao
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Energy & Fuels
Ziye Zhao, Lei Wang, Jinmeng Fan, Yunhua Song, Guangwen Chu, Lei Shao
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2020)
Article
Environmental Sciences
Lei Wang, Jimmy Yun, Hanxiao Zhang, Jianmeng Si, Xihong Fang, Lei Shao
Summary: In this study, a rotating packed bed (RPB) was used to enhance ozone transfer and BPA degradation, improving the efficiency of ozonation. The effects of operational parameters on degradation efficiency and overall mass transfer coefficient were investigated, showing that RPB effectively promoted gas transfer and BPA degradation.
Article
Energy & Fuels
Jinmeng Fan, Fei Fan, Wei Wang, Hanxiao Zhang, Lei Wang, Jiawei Chang, Qi Liang, Dan Wang, Zhibang Liu, Lei Shao
Summary: In this study, the combination of RSR and BCR was used to enhance the degradation of AR73 in dyeing wastewater, achieving high efficiency in ozone consumption and reaction time. The results demonstrated the effectiveness of the O-3/RSR-BCR process in decolorization of dyeing wastewater.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Engineering, Chemical
Zemeng Zhao, Zhibang Liu, Yang Xiang, Moses Arowo, Lei Shao
Summary: The study aimed to enhance the removal of dissolved oxygen from water using a novel rotor-stator reactor (RSR) and found that the nitrogen stripping combined with vacuum degassing technique achieved significantly higher deoxygenation efficiency and mass transfer coefficient compared to vacuum degassing alone. A correlation to predict mass transfer coefficient was established and the RSR was identified as a promising deaerator due to its improved gas-liquid contact.
Article
Engineering, Chemical
Arash Esmaeili, Amin Tamuzi, Tohid N. Borhani, Yang Xiang, Lei Shao
Summary: The CO2 removal model using a blended amine solution in a rotating packed bed showed good agreement with experimental data, with an average absolute deviation of less than 7.0%. The process analysis revealed that rotational speed and PZ concentration have significant effects on CO2 absorption efficiency.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Hao Xiao, Lei Wang, Zhibang Liu, Baochang Sun, Guangwen Chu, Yunhua Song, Lei Shao
Summary: This study measured the effective mass transfer area and local gas-side mass transfer coefficient in a rotor-stator reactor (RSR) and investigated the effects of operating conditions and stator rings on these mass transfer parameters. The results showed that the RSR with stator rings had higher mass transfer efficiency compared to the RSR without stator rings, indicating the potential industrial applications of RSR in processes controlled by gas-side mass transfer.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Zhibang Liu, Hanxiao Zhang, Yunhua Song, Yang Xiang, Hao Xiao, Huapeng Ma, Jimmy Yun, Lei Shao
Summary: This study explores the absorption of carbon dioxide using a two-phase absorbent in a rotating zigzag bed. The results demonstrate that the DEEA + DETA solution has a significant advantage in CO2 absorption performance compared to other absorbents. An artificial neural network model is also established to predict the absorption efficiency.
Article
Engineering, Chemical
Zhibang Liu, Arash Esmaeili, Hanxiao Zhang, Dan Wang, Yuan Lu, Lei Shao
Summary: In this study, the mass transfer characteristics in a rotating zigzag bed (RZB) with a CO2-NaOH system were investigated, and a mathematical model was established to illustrate the gas-liquid mass transfer mechanism. It was found that the rotational speed had the largest impact on the overall gas-phase volumetric mass-transfer coefficient (K(G)a) in the RZB. Experimental results showed that increasing the liquid flow rate, inlet gas flow rate, rotational speed, absorbent temperature, and absorbent concentration was conducive to gas-liquid mass transfer in the RZB. The model predictions agreed well with experimental results, indicating the model's potential for depicting the mass transfer process and guiding the application of RZBs in CO2 absorption.
Article
Engineering, Chemical
Peng Xu, Tianyang Wu, Yang Xiang, Jimmy Yun, Lei Shao
Summary: This study investigated the use of ozone in a rotating packed bed with liquid detention for the treatment of BR-46. The results showed that liquid detention significantly enhanced the treatment effect and ozone absorption rate. The utilization of liquid detention can extend the application of high-gravity technology to processes requiring long liquid residence time.
Article
Engineering, Chemical
Hong-Wei Liang, Wen-Ling Li, Zi-Sheng Feng, Han Chen, Hong-Wang Qiao, Lei Shao, Guang-Wen Chu, Yang Xiang
Summary: This study established a three-dimensional computational fluid dynamics model to simulate the gas-liquid flow and mass transfer characteristics in a bubble column. The predicted values of the modified eddy cell mass transfer model were found to be more consistent with experimental results. The study showed significant changes in gas holdup, bubble diameter, and gas-liquid interface area with and without mass transfer. Furthermore, the gas flow rate and static liquid height were found to have varying effects on the gas-liquid flow field and mass transfer characteristics.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
