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
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
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
Detection of CO
Veselina Georgieva, Richard Retoux, Valerie Ruaux, Valentin Valtchev, Svetlana Mintova
《化学科学与工程前沿（英文）》
2018年
第12卷
第1期
页码 94-102
doi:
10.1007/s11705-017-1692-5
摘要：
Detection of oxygen and carbon dioxide is important in the field of chemical and biosensors for atmosphere and biosystem monitoring and fermentation processes. The present study reports on the preparation of zeolite films doped with iron nanoparticles for detection of CO and O in gas phase. Pure nanosized LTL type zeolite with monomodal particle size distribution loaded with iron (Fe-LTL) was prepared under hydrothermal condition from colloidal precursor suspensions. The zeolite was loaded with iron to different levels by ion exchange. The Fe-LTL suspensions were used for preparation of thin films on silicon wafers via spin coating method. The reduction of the iron in the zeolite films was carried out under H flow (50% H in Ar) at 300 °C. The presence of iron nanoparticles is proved by ultra-violet-visible spectroscopy. The properties of the films including surface roughness, thickness, porosity, and mechanical stability were studied. In addition, the loading and distribution of iron in the zeolite films were investigated. The Fe-LTL zeolite films were used to detect O and CO in a concentration dependent mode, followed by IR spectroscopy. The changes in the IR bands at 855 and 642 cm (Fe–O–H and Fe–O bending vibrations) and at 2363 and 2333 cm (CO asymmetric stretching) corresponding to the presence of O and CO , respectively, were evaluated. The response to O and CO was instant, which was attributed to great accessibility of the iron in the nanosized zeolite crystals. The saturation of the Fe-LTL films with CO and O at each concentration was reached within less than a minute. The Fe-LTL films detected both oxygen and carbon dioxide in contrast, to the pure LTL zeolite film.
关键词：
zeolite films
detection of CO2 and O2
adsorption
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
Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2
《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
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作者
时间
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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
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
Newly-modeled graphene-based ternary nanocomposite for the magnetophotocatalytic reduction of CO2 with
期刊论文
Tuning porosity of coal-derived activated carbons for CO2 adsorption
期刊论文
Detection of CO
Veselina Georgieva, Richard Retoux, Valerie Ruaux, Valentin Valtchev, Svetlana Mintova
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
Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO2
期刊论文
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王子明,李清平,李姜辉,范振宁,张建
期刊论文
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赵玉文
期刊论文
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范慧,宋世栋,韩敏芳
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Kechao Zhao,Zhenhua Li,Li Bian
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刘月亮, 胡婷, 芮振华, 张政, 都凯, 杨涛, Birol Dindoruk, Erling Halfdan Stenby, Farshid Torabi, Andrey Afanasyevc
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Corrigendum to “Interactions between the Design and Operation of Shale Gas Networks, Including CO2
Mahdi Sharifzadeh,Xingzhi Wang,Nilay Shah
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Al2O3 and CeO2-promoted MgO sorbents for CO2 capture at moderate
Huimei Yu, Xiaoxing Wang, Zhu Shu, Mamoru Fujii, Chunshan Song
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普光气田地面集输系统的内腐蚀控制与监测
欧莉,李时杰,苏国丰
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