Video Experimental Relacionado

Updated: Jun 18, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO₂ Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Coadsorción y separación de mezclas de CO2-CH4 en el altamente flexible MIL-53Cr) MOF

Lomig Hamon¹, Philip L Llewellyn, Thomas Devic

¹IFP, Direction Catalyse et Séparation, 69360 Solaize, France.

Journal of the American Chemical Society

|November 13, 2009

Resumen

El marco metálico-orgánico flexible MIL-53 ((Cr) es prometedor para la separación de dióxido de carbono (CO2) y metano (CH4). El CO2 ocupa preferentemente poros estrechos, lo que permite la separación selectiva de los gases.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química Química es la química.
Ingeniería Química Ingeniería Química.

Sus antecedentes:

Los materiales porosos flexibles son cruciales para las tecnologías de separación de gases.
El tereftalato de cromo MIL-53 (Cr) exhibe un efecto único de "respiración" durante la adsorción de gas.

Objetivo del estudio:

Para investigar la coadsorción del dióxido de carbono (CO2) y el metano (CH4) utilizando MIL-53Cr a temperatura ambiente.
Comprender la respuesta estructural de MIL-53 (Cr) a las mezclas de CO2/CH4 y evaluar sus capacidades de separación.

Principales métodos:

Difracción de polvo de rayos X de sincrotrón in situ y espectroscopia Raman para monitorear cambios estructurales y cantidades adsorbidas.
Gravimetría y análisis de la curva de avance para mediciones cuantitativas de coadsorción.
Simulaciones por computadora para modelar la composición de la fase adsorbida.

Principales resultados:

MIL-53 ((Cr) exhibe un comportamiento de "respiración" similar a la adsorción de CO2 puro, controlado principalmente por la presión parcial de CO2.
La inclusión de metano (CH4) impide la transformación de la forma de los poros grandes (LP) a la forma de los poros estrechos (NP).
El CH4 está excluido de la forma NP, que está ocupada exclusivamente por moléculas de CO2, lo que indica una adsorción selectiva.

Conclusiones:

MIL-53 ((Cr) demuestra una adsorción selectiva de CO2 sobre CH4, impulsada por la dinámica de llenado de poros.
La flexibilidad estructural del material y la adsorción selectiva de poros son claves para la separación de CO2/CH4.
MIL-53 ((Cr) muestra potencial para su aplicación en los procesos de adsorción por oscilación de presión (PSA) para la purificación de gas natural.

Más Videos Relacionados

A Synthetic Methodology for Preparing Impregnated and Grafted Amine-Based Silica Composites for Carbon Capture

A Synthetic Methodology for Preparing Impregnated and Grafted Amine-Based Silica Composites for Carbon Capture

Published on: September 29, 2023

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

Videos de Conceptos Relacionados

Adsorption of Gases on Solids

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...

Adsorption Isotherms II

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

Adsorption Isotherms I

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

Supercritical Fluid Chromatography

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...

¹³C NMR: ¹H–¹³C Decoupling

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

Analyte Adsorption and Distribution

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...