Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2capture sorbents
《化学科学与工程前沿（英文）》
2022年
第16卷
第10期
页码 1460-1475
doi:
10.1007/s11705-022-2159-x
摘要：
Carbon nanotubes-based materials have been identified as promising sorbents for efficient CO2 capture in fluidized beds, suffering from insufficient contact with CO2 for the high-level CO2 capture capacity. This study focuses on promoting the fluidizability of hard-to-fluidize pure and synthesized silica-coated amine-functionalized carbon nanotubes. The novel synthesized sorbent presents a superior sorption capacity of about 25 times higher than pure carbon nanotubes during 5 consecutive adsorption/regeneration cycles. The low-cost fluidizable-SiO2 nanoparticles are used as assistant material to improve the fluidity of carbon nanotubes-based sorbents. Results reveal that a minimum amount of 7.5 and 5 wt% SiO2 nanoparticles are required to achieve an agglomerate particulate fluidization behavior for pure and synthesized carbon nanotubes, respectively. Pure carbon nanotubes + 7.5 wt% SiO2 and synthesized carbon nanotubes + 5 wt% SiO2 indicates an agglomerate particulate fluidization characteristic, including the high-level bed expansion ratio, low minimum fluidization velocity (1.5 and 1.6 cm·s–1), high Richardson−Zakin index (5.2 and 5.3 > 5), and low Π value (83.2 and 84.8 < 100, respectively). Chemical modification of carbon nanotubes causes not only enhanced CO 2 uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidization behavior for synthesized carbon nanotubes sorbent.
关键词：
CO2 capture
CNT-based sorbents
fluidization
SiO2 nanoparticles
fluidized bed reactors
Encapsulation of 2-amino-2-methyl-1-propanol with tetraethyl orthosilicate for CO2 capture
Sidra Rama, Yan Zhang, Fideline Tchuenbou-Magaia, Yulong Ding, Yongliang Li
《化学科学与工程前沿（英文）》
2019年
第13卷
第4期
页码 672-683
doi:
10.1007/s11705-019-1856-6
摘要：
Carbon capture is widely recognised as an essential strategy to meet global goals for climate protection. Although various CO capture technologies including absorption, adsorption and membrane exist, they are not yet mature for post-combustion power plants mainly due to high energy penalty. Hence researchers are concentrating on developing non-aqueous solvents like ionic liquids, CO -binding organic liquids, nanoparticle hybrid materials and microencapsulated sorbents to minimize the energy consumption for carbon capture. This research aims to develop a novel and efficient approach by encapsulating sorbents to capture CO in a cold environment. The conventional emulsion technique was selected for the microcapsule formulation by using 2-amino-2-methyl-1-propanol (AMP) as the core sorbent and silicon dioxide as the shell. This paper reports the findings on the formulated microcapsules including key formulation parameters, microstructure, size distribution and thermal cycling stability. Furthermore, the effects of microcapsule quality and absorption temperature on the CO loading capacity of the microcapsules were investigated using a self-developed pressure decay method. The preliminary results have shown that the AMP microcapsules are promising to replace conventional sorbents.
关键词：
carbon capture
microencapsulated sorbents
emulsion technique
low temperature adsorption and absorption
Newly-modeled graphene-based ternary nanocomposite for the magnetophotocatalytic reduction of CO2 with
《化学科学与工程前沿（英文）》
2022年
第16卷
第10期
页码 1438-1459
doi:
10.1007/s11705-022-2166-y
摘要：
The development of CO2 into hydrocarbon fuels has emerged as a green method that could help mitigate global warning. The novel structured photocatalyst is a promising material for use in a photocatalytic and magneto-electrochemical method that fosters the reduction of CO2 by suppressing the recombination of electron−hole pairs and effectively transferring the electrons to the surface for the chemical reaction of CO2 reduction. In our study, we have developed a novel-structured AgCuZnS2–graphene–TiO2 to analyze its catalytic activity toward the selective evolution of CO2. The selectivity of each nanocomposite substantially enhanced the activity of the AgCuZnS2–graphene–TiO2 ternary nanocomposite due to the successful interaction, and the selectivity of the final product was improved to a value 3 times higher than that of the pure AgCuZnS2 and 2 times higher than those of AgCuZnS2–graphene and AgCuZnS2–TiO2 under ultra-violet (UV)-light (λ = 254 nm) irradiation in the photocatalytic process. The electrochemical CO2 reduction test was also conducted to analyze the efficacy of the AgCuZnS2–graphene–TiO2 when used as a working electrode in laboratory electrochemical cells. The electrochemical process was conducted under different experimental conditions, such as various scan rates (mV·s–1), under UV-light and with a 0.07 T magnetic-core. The evolution of CO2 substantially improved under UV-light (λ = 254 nm) and with 0.07 T magnetic-core treatment; these improvements were attributed to the facts that the UV-light activated the electron-transfer pathway and the magnetic core controlled the pathway of electron-transmission/prevention to protect it from chaotic electron movement. Among all tested nanocomposites, AgCuZnS2–graphene–TiO2 absorbed the CO2 most strongly and showed the best ability to transfer the electron to reduce the CO2 to methanol. We believe that our newly-modeled ternary nanocomposite opens up new opportunities for the evolution of CO2 to methanol through an electrochemical and photocatalytic process.
关键词：
ternary nanocomposite
photocatalytic
electrochemical CO2 reduction
UV-light
magnetic core
Reduction potential of the energy penalty for CO capture in CCS
《能源前沿（英文）》
2023年
第17卷
第3期
页码 390-399
doi:
10.1007/s11708-023-0864-x
摘要：
CO2 capture and storage (CCS) has been acknowledged as an essential part of a portfolio of technologies that are required to achieve cost-effective long-term CO2 mitigation. However, the development progress of CCS technologies is far behind the targets set by roadmaps, and engineering practices do not lead to commercial deployment. One of the crucial reasons for this delay lies in the unaffordable penalty caused by CO2 capture, even though the technology has been commonly recognized as achievable. From the aspects of separation and capture technology innovation, the potential and promising direction for solving this problem were analyzed, and correspondingly, the possible path for deployment of CCS in China was discussed. Under the carbon neutral target recently proposed by the Chinese government, the role of CCS and the key milestones for deployment were indicated.
关键词：
CO2 capture and storage (CCS)
CO2 separation
energy penalty
Tuning porosity of coal-derived activated carbons for CO2 adsorption
《化学科学与工程前沿（英文）》
2022年
第16卷
第9期
页码 1345-1354
doi:
10.1007/s11705-022-2155-1
摘要：
A simple method was developed to tune the porosity of coal-derived activated carbons, which provided a model adsorbent system to investigate the volumetric CO2 adsorption performance. Specifically, the method involved the variation of the activation temperature in a K2CO3 induced chemical activation process which could yield activated carbons with defined microporous (< 2 nm, including ultra-microporous < 1 nm) and meso-micro-porous structures. CO2 adsorption isotherms revealed that the microporous activated carbon has the highest measured CO2 adsorption capacity (6.0 mmol∙g–1 at 0 °C and 4.1 mmol∙g–1 at 25 °C), whilst ultra-microporous activated carbon with a high packing density exhibited the highest normalized capacity with respect to packing volume (1.8 mmol∙cm−3 at 0 °C and 1.3 mmol∙cm–3 at 25 °C), which is significant. Both experimental correlation analysis and molecular dynamics simulation demonstrated that (i) volumetric CO2 adsorption capacity is directly proportional to the ultra-micropore volume, and (ii) an increase in micropore sizes is beneficial to improve the volumetric capacity, but may lead a low CO2 adsorption density and thus low pore space utilization efficiency. The adsorption experiments on the activated carbons established the criterion for designing CO2 adsorbents with high volumetric adsorption capacity.
关键词：
coal-derived activated carbons
porosity
CO2 adsorption
molecular dynamics
Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas
Solomon A. Aromada, Bjørn Kvamme
《化学科学与工程前沿（英文）》
2019年
第13卷
第3期
页码 616-627
doi:
10.1007/s11705-019-1795-2
摘要：
Evaluation of maximum content of water in natural gas before water condenses out at a given temperature and pressure is the initial step in hydrate risk analysis during pipeline transport of natural gas. The impacts of CO and H S in natural gas on the maximum mole-fractions of water that can be tolerated during pipeline transport without the risk of hydrate nucleation has been studied using our novel thermodynamic scheme. Troll gas from the North Sea is used as a reference case, it contains very negligible amount of CO and no H S. Varying mole-fractions of CO and H S were introduced into the Troll gas, and the effects these inorganic impurities on the water tolerance of the system were evaluated. It is observed that CO does not cause any distinguishable impact on water tolerance of the system, but H S does. Water tolerance decreases with increase in concentration of H S. The impact of ethane on the system was also investigated. The maximum mole-fraction of water permitted in the gas to ensure prevention of hydrate formation also decreases with increase in the concentration of C H like H S. H S has the most impact, it tolerates the least amount of water among the components studied.
关键词：
hydrate
hydrogen Sulphide
CO2
dew point
pipeline
Dynamic modelling and simulation of a post-combustion CO capture process for coal-fired power plants
《化学科学与工程前沿（英文）》
2022年
第16卷
第2期
页码 198-209
doi:
10.1007/s11705-021-2057-7
摘要：
Solvent-based post-combustion capture technologies have great potential for CO2 mitigation in traditional coal-fired power plants. Modelling and simulation provide a low-cost opportunity to evaluate performances and guide flexible operation. Composed by a series of partial differential equations, first-principle post-combustion capture models are computationally expensive, which limits their use in real time process simulation and control. In this study, we propose a first-principle approach to develop the basic structure of a reduced-order model and then the dominant factor is used to fit properties and simplify the chemical and physical process, based on which a universal and hybrid post-combustion capture model is established. Model output at steady state and trend at dynamic state are validated using experimental data obtained from the literature. Then, impacts of liquid-to-gas ratio, reboiler power, desorber pressure, tower height and their combination on the absorption and desorption effects are analyzed. Results indicate that tower height should be designed in conjunction with the flue gas flow, and the gas-liquid ratio can be optimized to reduce the reboiler power under a certain capture target.
关键词：
CO2 capture
post-combustion capture
simulation
dominant factor
Carbon Storage Potential of Shale Reservoirs Based on CO2 Fracturing Technology
Siwei Meng,Fengyuan Zhang,Jiaping Tao,Xu Jin,Jianchun Xu,He Liu,
《工程（英文）》
doi:
10.1016/j.eng.2023.11.018
摘要：
The development of shale reservoirs is important in ensuring China’s national energy security by achieving energy independence. Among the key technologies for shale oil production, CO2 fracturing is an effective method that can not only enhance oil recovery but also promote large amounts of CO2 storage, thereby supporting China’s goals of achieving a carbon peak and carbon neutrality. This research paper aims to study the impacts and prospective applications of CO2 fracturing in shale reservoirs, using real exploitation parameters from the GYYP1 well in the Songliao Basin. By utilizing numerical simulation, the dynamics of CO2 production are analyzed. Adsorption and diffusion are identified as pivotal mechanisms for CO2 storage in shale reservoirs. After the analysis of the fracturing process, approximately 22.13% of CO2 is found to be adsorbed, which decreases to 11.06% after ten years due to pressure decline. Diffusion increases the volume of CO2 interacting with a greater extent of shale, thereby enhancing the adsorption mechanism. Over time, the diffusion process results in a remarkable increase of 26.02% in CO2 adsorption, ensuring the long-term and stable storage of CO2 within the shale reservoir. This investigation delves into the contribution of these two crucial mechanisms of CO2 storage in shale reservoirs, ultimately predicting that, by 2030, approximately two million tons of CO2 can be effectively stored in the Daqing Oilfield through CO2 fracturing in shale oil reservoirs. Such an achievement will undoubtedly contribute to the sustainable development of the energy sector and foster the transformation and upgrading of China’s energy structure.
关键词：
CO
2
fracturing
Shale reservoir
Numerical simulation
Adsorption
Diffusion
标题
作者
时间
类型
操作
离岸碳捕集利用与封存技术体系研究
李姜辉,李鹏春,李彦尊,童峰
期刊论文
Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2capture sorbents
期刊论文
Encapsulation of 2-amino-2-methyl-1-propanol with tetraethyl orthosilicate for CO2 capture
Sidra Rama, Yan Zhang, Fideline Tchuenbou-Magaia, Yulong Ding, Yongliang Li
期刊论文
Newly-modeled graphene-based ternary nanocomposite for the magnetophotocatalytic reduction of CO2 with
期刊论文
Reduction potential of the energy penalty for CO capture in CCS
期刊论文
Tuning porosity of coal-derived activated carbons for CO2 adsorption
期刊论文
Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas
Solomon A. Aromada, Bjørn Kvamme
期刊论文
刘公平：面向CO₂捕集的混合基质膜设计制备（2022年4月16日）
2022年06月09日
会议视频
海洋CO2管道输送技术现状与展望
王子明,李清平,李姜辉,范振宁,张建
期刊论文
Dynamic modelling and simulation of a post-combustion CO capture process for coal-fired power plants
期刊论文
Carbon Storage Potential of Shale Reservoirs Based on CO2 Fracturing Technology
Siwei Meng,Fengyuan Zhang,Jiaping Tao,Xu Jin,Jianchun Xu,He Liu,
期刊论文
太阳能技术对我国未来减排CO2 的贡献
赵玉文
期刊论文
Evolution of CO2 Storage Mechanisms in Low-Permeability Tight Sandstone Reservoirs
Xiangzeng Wang,Hong Yang,Yongjie Huang,Quansheng Liang,Jing Liu,Dongqing Ye,
期刊论文
Corrigendum to “Interactions between the Design and Operation of Shale Gas Networks, Including CO2
Mahdi Sharifzadeh,Xingzhi Wang,Nilay Shah
期刊论文
and measurements: Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for COcapture in real conditions
期刊论文
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