Article
Engineering, Environmental
Jinzhi Cai, Zhenshan Li
Summary: A density functional theory-based rate equation was developed to predict the gas-solid reaction kinetics of CaO carbonation with CO2 in calcium looping. The negative activation energy of CaO carbonation close to equilibrium was accurately predicted through experimental validation.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Energy & Fuels
Nai Rong, Yan Wu, Jiuheng Wang, Long Han, Geng Wang
Summary: The study fabricated calcium-based sorbents with a starch pore former and a cement stabilizer for high-temperature CO2 capture. The addition of 10% starch template and 20% cement resulted in the highest CO2 uptake after 20 cycles. Different steam reactivation methods were explored to restore CO2-capture performance for the modified sorbents.
Article
Chemistry, Multidisciplinary
Vyacheslav V. Rodaev, Svetlana S. Razlivalova, Alexander I. Tyurin, Vladimir M. Vasyukov
Summary: A Zr-doped CaO sorbent with an average filament diameter of about 160 nm was fabricated using electrospinning. The sorbent showed an initial CO2 uptake capacity of 12.1 mmol/g, a specific surface area of 79 m(2)/g, an indentation Young's modulus of 520 MPa, and a hardness of 1.6 MPa. After 50 carbonation/decarbonation cycles, the sorbent still exhibited a decent CO2 uptake capacity of 9.7 mmol/g due to the uniform distribution of CaZrO3 in the CaO nanofibers.
Article
Engineering, Environmental
Yongqing Xu, Cong Luo, Huiying Sang, Bowen Lu, Fan Wu, Xiaoshan Li, Liqi Zhang
Summary: The study prepared NaCl-modified CaO-based sorbents through simultaneous hydration and impregnation, and investigated their cyclic CO2 capture capacity. The results showed that NaCl could tailor the temperature sensitivity of the sorbents and enhance their carbonation activity, particularly at higher temperatures.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Construction & Building Technology
Zuhua Xu, Zhixin Zhang, Jiansheng Huang, Kaifeng Yu, Guanming Zhong, Fuzi Chen, Xunyong Chen, Wengen Yang, Yaocheng Wang
Summary: Controlling environmental conditions can achieve different degrees of carbonation in concretes, but there is still a lack of unified conclusion on the impacts from external factors. In this review, the impacts of temperature, humidity, CO2 concentration and their coupling effects on carbonation of concretes are summarized, and future research perspectives are raised.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Chemical
Nai Rong, Jiuheng Wang, Kaiwei Liu, Long Han, Zhengyong Mu, Xvqing Liao, Wenjia Meng
Summary: Cellulose-templated CaO-based pellets were prepared and their CO2 capture capacity was improved by steam injection during calcination. The modified pellets with 10% steam injection showed a faster carbonation rate and achieved a higher CO2 uptake after 20 cycles compared to the raw and modified sorbents without steam reactivation. Additionally, the sintering of the sorbents was enhanced and their mechanical strength increased by nearly 4 times through simultaneous thermal and atmosphere-induced processes. However, the presence of steam under harsh conditions further aggravated the sintering and resulted in a significant decrease in CO2 uptake.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
F. Dashtestani, M. Nusheh, V. Siriwongrungson, J. Hongrapipat, V. Materic, S. Pang
Summary: This study investigated the impact of contaminants in biomass gasification producer gas on the CO2 capture performance of a CaO and Fe2O3 based sorbent material. Experimental results showed effective CO2 capture in the initial stages and a catalytic effect of the sorbent material in removing contaminants from the gas.
Article
Environmental Sciences
Xiao-Yong Wang
Summary: This study presents an analysis model of CO2 uptake of slag-blended concrete considering the service stage and the recycling stage. The analysis results show that the total CO2 uptake ratio increases with an increase in slag replacement ratio and water-to-binder ratio. Structural elements, concrete component shape, and crushed concrete diameter can impact the rate of CO2 uptake, but do not affect the total CO2 uptake ratio.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Zhixin Li, Qinhui Wang, Mengxiang Fang, Jianmeng Cen, Zhongyang Luo
Summary: In this study, modified CaO-based adsorbents doped with high aluminum cement were prepared by hydration method and their performance in different reactors was investigated. The results showed that the adsorbent doped with 5 wt.% high aluminum cement had the best CO2 capture capability in all reactors, especially in the bubbling fluidized bed reactor. The activation energy of the modified adsorbent in different reaction stages was also determined, showing potential for efficient carbon capture technologies.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Physical
Shuming Zhang, Su He, Ningbo Gao, Jianqiao Wang, Yihang Duan, Cui Quan, Boxiong Shen, Chunfei Wu
Summary: Biomass gasification is a promising technology for renewable energy production, but it faces challenges of low energy efficiency, low syngas production, and sintering of biomass ash. This study investigated the influence of in-situ generated heat from CaO-CO2 on cellulose CO2 gasification, and the results showed that energy compensation of CaO carbonation significantly improved the gasification temperature, gas yield, and H2/CO ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Xiaotong Ma, Xingkang Huang, Tai Feng, Mingfei Mu, Xiude Hu
Summary: CaO-based materials are effective sorbents for removing HCl and CO2, with HCl having a preference for interacting with surface oxygen atoms on the CaO (100) surface. The adsorption energy per HCl decreases as repulsion between HCl molecules increases with rising coverage, indicating a competing adsorption behavior with CO2. The presence of HCl inhibits CO2 adsorption and promotes CO2 desorption by lowering the absorption energy and reaction barrier in the HCl/CaO system compared to pristine CaO (100).
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Chemical
Long Ren, Mingchun Li, Sijin Wang, Laishi Li, Yusheng Wu
Summary: In this study, limestone-derived sorbents with enhanced carbonation reactivity and diffusivity were prepared by incorporating Na+ ions into the CaO lattice. The modified sorbents showed improved CO2 capture capacity and durability due to the formation of solid-state ion transport channels within the product layer.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Construction & Building Technology
Zhuohui Ma, Hongqiang Liao, Li Wang, Fangqin Cheng
Summary: The study shows that the addition of Fe2O3, Fe3O4, SiO2, MgO, and Al2O3 has an influence on the carbonation rate and efficiency of CaO, with synergistic effects observed with Fe2O3, Fe3O4, MgO, and Al2O3, while the effect with SiO2 is relatively small.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Environmental
Athanasios Scaltsoyiannes, Andy Antzaras, Georgios Koilaridis, Angeliki Lemonidou
Summary: Calcium looping is an attractive technology for post-combustion CO2 capture, hydrogen production, and energy storage applications. The carbonation reaction is a first-order process with respect to CO2 in the gas phase, and the developed kinetic model can predict the carbonation rate of CaO-based materials regardless of the type and percentage of the contained inert phase.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Seong Ho Han, Yubin Jun, Jae Hong Kim
Summary: This paper proposes a new process for CO2 curing of cement-based materials, using an aqueous carbonation submerged in amine solvents. This method enhances the strength of the materials and eliminates the need for large-scale equipment. Additionally, it allows for easy transportation and utilization of CO2 captured in liquid form, while reducing energy consumption for regenerating amine solvents.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)