U.S. Department of Energy

Robert L Thompson

Nicholas S Siefert

David Luebke

Hunaid B Nulwala

Brian W Kail

David Hopkinson

Christopher Matranga

Fan Shi

Congjun Wang

Lei Hong

Megan Macala

The present disclosure provides a method for the separation of a gas constituent from a gaseous mixture. The disclosure also provides polyethylene glycol disubstituted siloxane based solvents for use in the method. These solvents are of use for pre-combustion COcapture and are capable of replacing glycol-based solvents while offering operation at a higher temperature region. These solvents are also of use for generation of hydrogen from reformed natural gas or syngas, adjusting CO/Hratio for Coal & Biomass to Liquids, removal of COfrom syngas for coal & biomass to NH/Fertilizer, natural gas sweetening, and upgrading of landfill and biogas.

Di-substituted siloxane solvents for gas capture

Exemplary embodiments relate to methods for removal of COand other acid gases from gaseous fuels prior to combustion. Exemplary methods may be used for COcapture, Hpurification and natural gas sweetening. Exemplary methods use at least one ionic liquid that has excellent COsolubility, selectivity over hydrogen, low viscosity, and resistance to HS.

Sulfur tolerant hydrophobic ionic liquid solvent

The method provides for use of sensitized photocatalyst for the photocatalytic reduction of COunder visible light illumination. The photosensitized catalyst is comprised of a wide band gap semiconductor material, a transition metal co-catalyst, and a semiconductor sensitizer. The semiconductor sensitizer is photoexcited by visible light and forms a Type II band alignment with the wide band gap semiconductor material. The wide band gap semiconductor material and the semiconductor sensitizer may be a plurality of particles, and the particle diameters may be selected to accomplish desired band widths and optimize charge injection under visible light illumination by utilizing quantum size effects. In a particular embodiment, COis reduced under visible light illumination using a CdSe/Pt/TiO2 sensitized photocatalyst with HO as a hydrogen source.

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Pittsburgh, PA, United States of America

Robert L Thompson