Effects of glycol on adsorption dynamics of idealized water droplets on LTA‐3A zeolite surfaces

Olsen, Richard K.; Kvamme, Bjørn

doi:10.1002/aic.16567

Cited by 9 publications

(3 citation statements)

References 61 publications

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“…Porous materials with a hierarchical pore system have demonstrated promising solutions for energy and environmental sustainability. , Although the traditional porous materials of zeolites, silica, and activated carbons have been widely studied, the design and preparation of highly porous materials with regular, periodic, and hierarchical frameworks are still challenging, since they are mainly limited by their inherent properties of low crystallinity, poor tunability, and uncontrolled structural arrangement. − …”

Section: Resultsmentioning

confidence: 99%

Bottom-Up Assembly of a Complex Superstructure from a Simple Low-Symmetry Block and Three Ni Nodes

Huang

Dong

et al. 2021

Crystal Growth & Design

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Design and synthesis of a superstructure with a hierarchical pore system from simple building blocks are a great challenge. Herein, we report the assembly of a complex superstructure (termed NTU-81) by using a strategy of bottom-up synthesis with a simple low-symmetry building block (4-(3,5-di(1H-imidazol-1-yl)phenyl)pyridine) and Ni nodes. Single-crystal X-ray diffraction revealed that NTU-81 ([C216H173N60Ni16O54, 2ZrF6·xGuest]) has three kinds of Ni clusters (Ni, Ni2O, and Ni3O) and two kinds of ligand connections (2-c and 3-c), which therefore makes the framework possess an unprecedented structural complexity and attractive hierarchical pore system. Notably, the crystallographically nonequivalent moieties in this monoclinic system fabricate 4-c and 5-c tetrakaidecahedrons, which are then organized into a cage-contained layer with a new topology (point symbol of {4.6.8}2{6.82}). Along with a charged pore surface, coordinated water molecules, and free pyridine N sites, NTU-81 shows highly efficient I2 capture in solution. These effects give rise to not only a new material for highly efficient I2 capture but also, more attractively, a design philosophy that can be extended to the construction of complex superstructures in a one-step reaction for desired applications.

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Section: Resultsmentioning

confidence: 99%

Bottom-Up Assembly of a Complex Superstructure from a Simple Low-Symmetry Block and Three Ni Nodes

Huang

Dong

et al. 2021

Crystal Growth & Design

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“…Ref. 70–75 provides overview of modern adsorption studies in classical MD modelling, including calculations of chemical potentials for adsorbed water and adsorbed guests, as well as for adsorbed ions and polar components. This is also relevant for injection of CO 2 /N 2 with addition of alcohol and/or surfactant.…”

Section: Advantages and Limitations Of Methods To Release Natural Gas...mentioning

confidence: 99%

Black Sea hydrate production value and options for clean energy production

Kvamme

Vasilev

2023

RSC Adv.

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“…Natural gas hydrates in sediments are unable to touch mineral surfaces due to extremely low chemical potential of the structured adsorbed water [21][22][23][24][25][26]. Another way to look at this fact is to consider distribution of atomistic charges in mineral surfaces.…”

Section: Small Alcohols As Surfactants In Hydrate Productionmentioning

confidence: 99%

Small Alcohols as Surfactants and Hydrate Promotors

Kvamme

2021

Fluids

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Many methods to produce hydrate reservoirs have been proposed in the last three decades. Thermal stimulation and injection of thermodynamic hydrate inhibitors are just two examples of methods which have seen reduced attention due to their high cost. However, different methods for producing hydrates are not evaluated thermodynamically prior to planning expensive experiments or pilot tests. This can be due to lack of a thermodynamic toolbox for the purpose. Another challenge is the lack of focus on the limitations of the hydrate phase transition itself. The interface between hydrate and liquid water is a kinetic bottle neck. Reducing pressure does not address this problem. An injection of CO2 will lead to the formation of a new CO2 hydrate. This hydrate formation is an efficient heat source for dissociating hydrate since heating breaks the hydrogen bonds, directly addressing the problem of nano scale kinetic limitation. Adding limited amounts of N2 increases the permeability of the injection gas. The addition of surfactant increases gas/water interface dynamics and promotes heterogeneous hydrate formation. In this work we demonstrate a residual thermodynamic scheme that allows thermodynamic analysis of different routes for hydrate formation and dissociation. We demonstrate that 20 moles per N2 added to the CO2 is thermodynamically feasible for generating a new hydrate into the pores. When N2 is added, the available hydrate formation enthalpy is reduced as compared to pure CO2, but is still considered sufficient. Up to 3 mole percent ethanol in the free pore water is also thermodynamically feasible. The addition of alcohol will not greatly disturb the ability to form new hydrate from the injection gas. Homogeneous hydrate formation from dissolved CH4 and/or CO2 is limited in amount and not important. However, the hydrate stability limits related to concentration of hydrate former in surrounding water are important. Mineral surfaces can act as hydrate promotors through direct adsorption, or adsorption in water that is structured by mineral surface charges. These aspects will be quantified in a follow-up paper, along with kinetic modelling based on thermodynamic modelling in this work.

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Effects of glycol on adsorption dynamics of idealized water droplets on LTA‐3A zeolite surfaces

Cited by 9 publications

References 61 publications

Bottom-Up Assembly of a Complex Superstructure from a Simple Low-Symmetry Block and Three Ni Nodes

Bottom-Up Assembly of a Complex Superstructure from a Simple Low-Symmetry Block and Three Ni Nodes

Black Sea hydrate production value and options for clean energy production

Small Alcohols as Surfactants and Hydrate Promotors

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