Article
Engineering, Chemical
Wan Zhang, Yingjie Li, Yuqi Qian, Boyu Li, Jianli Zhao, Zeyan Wang
Summary: Calcium looping for CO2 capture involves cyclic calcination/carbonation of CaO, with fuel combustion supplying energy for the process. The presence of unburned char in the calciner can lead to CO generation in the carbonator, which can reduce NO in flue gases. The study found that CaO exhibits efficient catalytic effect on NO removal by CO, with high temperature and CO concentration leading to higher NO removal efficiency in the presence of CaO. The optimal carbonation temperature for better NO removal and CO2 capture was determined to be 650 degrees C, and the study also highlighted the beneficial effects of high CaO content and porous structure of calcium-based sorbents on NO removal by CO.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
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
Engineering, Chemical
Mingzhi Luo, Guoquan Zhang, Yuguo Fang, Lingzhuo Cao, Zhanbo Guo, Kun Wang, Jia Li
Summary: This article presents a two-step synthesis method for synthesizing calcium carbonate using ammonium carbonate and calcium chloride as raw materials. The pH of the mineralized solution was studied under different factors, such as temperature and ammonium carbonate concentration. The results showed that increasing the temperature promoted the formation of submicron calcite type calcium carbonate, while changing the concentration of ammonium carbonate had little effect on the crystal phase and size of the product.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Daniele Ferrario, Stefano Stendardo, Vittorio Verda, Andrea Lanzini
Summary: The cement industry is responsible for 6-7% of global anthropogenic CO2 emissions and needs to be decarbonized to meet international greenhouse gas emission goals. This study explores the feasibility of using a solar-driven calcium looping (CaL) process for carbon capture in a cement plant. Through detailed process modeling and energy analysis, the performance of the system is evaluated. It is estimated that implementing solar-driven CaL technology in a cement plant could reduce CO2 emissions by over 90%.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Woong-Geol Lee, Myong-Shin Song
Summary: In this study, the mechanism of carbonation reaction through CO2 capture by synthesizing ternary (CaO-Al2O3-Fe2O3) compounds was investigated. It was found that the synthetic SCAF underwent carbonation reaction at different sintering temperatures, and the reaction became more active with increasing reaction time. Therefore, the synthesized SCAF in this study is expected to be an effective material for CO2 capture.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Environmental
Bao-Qi Feng, Han-Qing Chen, Chao Ping, Xiang Huang, Wen-Long Liu, Bao-Xia Dong, Yun-Lei Teng
Summary: The study shows that inert additive-doped CaO-based CO2 adsorbents can be synthesized in one pot by the mechanochemical method, producing methane instead of CO2 emission. The prepared CaO@C and CaO@MgO@C composites exhibit high CO2 adsorption capacity and superior cycling stability, with much lower activity losses after 30 cycles compared to conventional adsorbents. This work provides a novel, simple, solution-free, and sustainable strategy for synthesizing effective CaO-based CO2 adsorbents.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Long Han, Kaili Ma, Yuelun Wu, Nijie Jing, Liang Jin, Pingjiang Wu, Guoqiang Xu, Jia Xia, Chengkun Zhang
Summary: The study developed a synthesized absorbent Fe/Ca-Al with enhanced CO2 absorption ability and mechanical strength, as well as improved heavy tar elimination performance. It provides useful information and possible solutions for overcoming development obstacles in calcium looping gasification processes.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Krzysztof Labus
Summary: The study assessed the sequestration capacity of selected carbonate rocks, serpentinite, and basalt for CaL process. The results showed that limestones had the highest conversion rates, while basalt had the lowest. Thermal pretreatment of samples was effective in enhancing the conversion rates.
Article
Engineering, Environmental
Dasol Choi, Soyoung Noh, Youngjune Park
Summary: Calcium looping (CaL)-based solar to thermochemical energy storage is a promising option for long-term thermal energy storage in concentrated solar power generation. In this study, multi-doping of transition metals and CaCl2 was investigated to enhance the optical absorption and carbonation reactivity of synthetic CaO-based materials. The proposed materials exhibited significantly enhanced optical absorption and maintained high performance throughout multiple cycles of CaL reactions. The reaction mechanism was studied, and a salt-promoted carbonation mechanism was proposed to improve the mass transfer of Ca2+O2- to adsorbed CO2. Based on the findings, the synergistic use of CaCl2 multi-doping method for synthetic CaO designs is suggested.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Benjamin M. Tutolo, Adedapo Awolayo, Calista Brown
Summary: The world adds about 51 Gt of greenhouse gases to the atmosphere each year, and aggressive action is needed in the form of carbon dioxide removal (CDR) and other technologies to prevent dire global consequences. Proposed CDR technologies should be capable of removing at least 1% of current annual emissions, about half a gigaton, from the atmosphere each year. Basalt carbonation coupled to direct air capture (DAC) shows promise, but there are challenges to implementing carbon removal technologies at the gigaton-per-year scale, such as maintaining carbonation efficiency and dealing with CO2 injection rates.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Wei-Hsin Chen, Kuan-Hsiang Chen, Aristotle T. Ubando, Wen-Jhy Lee, Man -Hin Chio
Summary: Chemical looping combustion (CLC) using iron-based oxygen carriers can efficiently capture carbon dioxide and produce high yields of CO2 and H2O under specific operating conditions. Fe3O4 and Fe2O3 are the major components of iron in OCs during most reduction and oxidation reactions. Decreasing oxygen input leads to increased carbon formation in the system.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Juan Pablo Rincon Duarte, Dorottya Kriechbaumer, Bruno Lachmann, Stefania Tescari, Thomas Fend, Martin Roeb, Christian Sattler
Summary: Technologies for capturing CO2 from industrial processes are crucial for addressing climate change. The CaL cycle, which can be integrated into existing cement plants and powered by renewable energy sources, has gained attention. However, material issues, such as reduced sorption capacity and particles attrition, pose challenges for the continuous cycling process. In this study, we analyzed the performance of cycled limestone under real CO2 capture conditions and identified suitable reactors for a solar CaL cycle in cement plants.
Article
Energy & Fuels
Joseba Moreno, Sally L. Homsy, Max Schmid, Gunter Scheffknecht
Summary: This study investigated the multicyclic behavior of limestone in a 20 kWth CaL facility and analyzed the performance of the carbonator under various process variables. The carbonator design achieved high CO2 capture efficiencies and apparent carbonation rates within the investigated operating conditions. The proposed design could potentially be integrated into existing load-following power plants for more flexible usage of CaL systems.
Article
Engineering, Chemical
Hyesung Lee, Tae Wook Kim, Soung Hyoun Kim, Yu-Wei Lin, Chien-Tsung Li, YongMan Choi, Changsik Choi
Summary: Carbon capture and storage (CCS) technology can greatly reduce CO2 emissions from power plants and kilns by 85 to 95%. Among CCS technologies, carbon dioxide capture using steel slag involves carbonating minerals with CO2 by combining oxidized metals in the slag. This study evaluated the performance of a mineral carbonation plant in capturing and sequestering CO2, achieving an average CO2 sequestration efficiency of 89.7%, demonstrating the effectiveness of mineral carbonation products in storing CO2 as chemically stable CaCO3.
Article
Engineering, Environmental
Lifeng Li, Alireza Rahbari, Mahdiar Taheri, Roelof Pottas, Bo Wang, Morteza Hangi, Leanne Matthews, Lindsey Yue, Jose Zapata, Peter Kreider, Alicia Bayon, Chi-Hwa Wang, Terrence W. Simon, Joe Coventry, Wojciech Lipinski
Summary: The two-step calcium oxide based calcination-carbonation cycle is studied for carbon dioxide capture and solar thermochemical energy storage applications. The performance of an indirectly-irradiated packed-bed solar thermochemical reactor is evaluated experimentally using simulated high-flux solar irradiation. The reactor temperature peaked at 1,035 degrees C and the average solar-to-chemical conversion efficiency ranged from approximately 1.3% to 8.6% for the experimental runs. Improvements in thermomechanical characteristics, reaction chamber seals, and reactor geometry are necessary for the presented reactor design.
CHEMICAL ENGINEERING JOURNAL
(2023)
