22 research outputs found
Molecular Mechanisms for Adsorption in Cu-BTC Metal Organic Framework
We use molecular simulations to analyze the preferential adsorption sites of molecules that differ in size, shape, and polarizability in Cu-BTC metal organic framework. The cage system of the framework can be exploited to enhance adsorption of small gases. We find that nonpolar molecules adsorb preferentially in the small tetrahedral cages, whereas alcohols and water molecules adsorb close to the copper atoms in one of the big cages. Blocking potentially enhances selective adsorption and separation and we therefore investigate how to block these cages in a practical manner. We propose to use ionic liquids for it and we find that the addition of these components reduces the adsorption of polar molecules near the open metal centers. For this reason, the presence of ionic liquids reduces the attack of the molecules of water to the metallic centers improving the framework stability
Micelle Formation in Aqueous Solutions of Room Temperature Ionic Liquids: A Molecular Dynamics Study
1-Alkyl-3-methylimidazolium
cations in the presence of water are
used as a test system to study by molecular dynamics the formation
of micelles in aqueous mixtures of highly anisotropic room temperature
ionic liquids (IL). Structural properties, i.e., radial distribution
functions (RDF) and transport parameters, such as diffusion coefficients
and conductivities, are computed as a function of the IL/water mole
fraction. The concentration plots reveal a sharp change of the slope
of both the cation self-diffusion coefficient and the first peak of
the head鈥揾ead RDF at approximately the same value of the concentration.
This transition, considered as a measure of a critical micellar concentration,
appears only for the most anisotropic systems, composed of longer
alkyl chains. The formation of the micelles is confirmed from the
analysis of the tail鈥搕ail and cation鈥搘ater RDFs. As
a general result, we found that the larger the anisotropy of the ionic
liquid the lower the critical concentration and the larger the proportion
of monomers forming part of the micelles. The molecular dynamics predictions
are in line with the experimental evidence reported for these systems
Enhancing Separation Efficiency in European Syngas Industry by Using Zeolites
Syngas is traditionally used in industry for production of fuels in the kerosene, gasoline and diesel range via Fischer-Tropsch, for the manufacture of bulk chemicals like ammonia, methanol and dimethyl ether and for synthesis of a whole array of fine chemicals. The carbon monoxide/hydrogen ratio of the syngas is an important design variable to maximize production of these compounds. Therefore, the search of effective processes that enable said ratio adjustment as well as individual compound purification is an essential and ongoing effort for industry. In this work, we propose a development of a zeolite-based separation process to obtain carbon dioxide-neutral fuels and chemicals. The process designed is based on gas uptake and release, combining separation efficiency with low separation costs. Calculation of separation behavior has been done for mixtures generated by plasmolysis of CO2. Carbon dioxide dissociation into CO and O2 and as a result a mixture of carbon monoxide, oxygen and a residual carbon dioxide is obtained. Therefore, the purification of CO becomes necessary. Here we provide a purification process design based in multicomponent adsorption and separation in commercial available zeolites. The process identifies NaX and NaY as the most suitable zeolites for separation in a wide range of operating conditions
Enhancing Separation Efficiency in European Syngas Industry by Using Zeolites
Syngas is traditionally used in industry for production of fuels in the kerosene, gasoline and diesel range via Fischer-Tropsch, for the manufacture of bulk chemicals like ammonia, methanol and dimethyl ether and for synthesis of a whole array of fine chemicals. The carbon monoxide/hydrogen ratio of the syngas is an important design variable to maximize production of these compounds. Therefore, the search of effective processes that enable said ratio adjustment as well as individual compound purification is an essential and ongoing effort for industry. In this work, we propose a development of a zeolite-based separation process to obtain carbon dioxide-neutral fuels and chemicals. The process designed is based on gas uptake and release, combining separation efficiency with low separation costs. Calculation of separation behavior has been done for mixtures generated by plasmolysis of CO2. Carbon dioxide dissociation into CO and O2 and as a result a mixture of carbon monoxide, oxygen and a residual carbon dioxide is obtained. Therefore, the purification of CO becomes necessary. Here we provide a purification process design based in multicomponent adsorption and separation in commercial available zeolites. The process identifies NaX and NaY as the most suitable zeolites for separation in a wide range of operating conditions.</p
蟺-Complexation for olefin/paraffin separation using aluminosilicates
International audienc