CO2 capture helped by nanomaterials
Nanomaterials Help CO2 Capture
Bureau De Recherches Geologiques Et Minieres (BRGM) inventors Alain Seron, Fabian Delorme and Christian Fouillac have detailed a low-cost method for CO2 capture using nanomaterials such as mesoporous silica and carbon nanotubes in a U.S. Patent Application.
The method enables CO2 trapping in a reversible manner without the need for methods that are energetically costly (large increase in temperature, evaporation of a liquid phase, solid/liquid separation, etc.) and without any handling of the suspension constituting the trap which remains in place in the capture/release reactor throughout the cycle.
In addition, the method is performed under conditions of ambient pressure and temperature or near ambient conditions, with a slightly higher temperature favoring CO2 release.
The technique includes first suspending in a liquid phase a solid absorbent capable of trapping the gaseous CO2; the gas mixture is then converted into the liquid phase at a temperature between 0 degree C. and 30 degrees C., a temperature ranging from the liquid phase solidification temperature to the evaporation temperature. The process is carried out at a pressure between atmospheric pressure and 3 bars.
The absorbent solid is selected equally among: a carbonaceous material such as activated carbon or carbon nanotubes; an oxide, for example silicates such as zeolites, clays, mesoporous silicas, manganese oxides, pumice, perlite or diatomite; a phosphate or a phosphonate; and a hydroxide such as the layered double hydroxides quintinite-3T or hydrotalcite. Layered double hydroxides (LDHs) perform particularly well in absorbing CO2.
The method includes an additional step of recovering the captured gaseous CO2. The combination of the trapping steps and the recovery steps enable purification of the CO2.
The recovery step comprises a step of lowering the partial pressure of the gas to be trapped introduced into the liquid phase, this step being achieved either by lowering the partial pressure of CO2 (in particular by recirculating, in the reactor saturated with CO2, a stream of gas depleted of CO2 from a capture reactor in operation) or by use of a weak vacuum pressure at most equal to 0.2 bar with respect to the capture pressure, or by shutting off circulation of the gas containing CO2
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Labels: CO2 capture- nanotubes-nanomaterials-BRGM researchers
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=2&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=81&f=G&l=50&co1=OR&d=PG01&s1=nano&s2=nanotubes&OS=nano+OR+nanotubes&RS=nano+OR+nanotubes
Bureau De Recherches Geologiques Et Minieres (BRGM) inventors Alain Seron, Fabian Delorme and Christian Fouillac have detailed a low-cost method for CO2 capture using nanomaterials such as mesoporous silica and carbon nanotubes in a U.S. Patent Application.
The method enables CO2 trapping in a reversible manner without the need for methods that are energetically costly (large increase in temperature, evaporation of a liquid phase, solid/liquid separation, etc.) and without any handling of the suspension constituting the trap which remains in place in the capture/release reactor throughout the cycle.
In addition, the method is performed under conditions of ambient pressure and temperature or near ambient conditions, with a slightly higher temperature favoring CO2 release.
The technique includes first suspending in a liquid phase a solid absorbent capable of trapping the gaseous CO2; the gas mixture is then converted into the liquid phase at a temperature between 0 degree C. and 30 degrees C., a temperature ranging from the liquid phase solidification temperature to the evaporation temperature. The process is carried out at a pressure between atmospheric pressure and 3 bars.
The absorbent solid is selected equally among: a carbonaceous material such as activated carbon or carbon nanotubes; an oxide, for example silicates such as zeolites, clays, mesoporous silicas, manganese oxides, pumice, perlite or diatomite; a phosphate or a phosphonate; and a hydroxide such as the layered double hydroxides quintinite-3T or hydrotalcite. Layered double hydroxides (LDHs) perform particularly well in absorbing CO2.
The method includes an additional step of recovering the captured gaseous CO2. The combination of the trapping steps and the recovery steps enable purification of the CO2.
The recovery step comprises a step of lowering the partial pressure of the gas to be trapped introduced into the liquid phase, this step being achieved either by lowering the partial pressure of CO2 (in particular by recirculating, in the reactor saturated with CO2, a stream of gas depleted of CO2 from a capture reactor in operation) or by use of a weak vacuum pressure at most equal to 0.2 bar with respect to the capture pressure, or by shutting off circulation of the gas containing CO2
more
Labels: CO2 capture- nanotubes-nanomaterials-BRGM researchers
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=2&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=81&f=G&l=50&co1=OR&d=PG01&s1=nano&s2=nanotubes&OS=nano+OR+nanotubes&RS=nano+OR+nanotubes
Labels: Alain Seron, Bureau De Recherches Geologiques Et Minieres (BRGM), Fabian Delorme and Christian Fouillac
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