초록 ▼

A reversible adsorbent for carbon dioxide, which can be used as a decontaminant of closed environments, has been devised. It consists of a novel material formed by a surface modified silica gel with active sites for the chemisorption of CO2 at room temperature combined with a clay which acts as an a

A reversible adsorbent for carbon dioxide, which can be used as a decontaminant of closed environments, has been devised. It consists of a novel material formed by a surface modified silica gel with active sites for the chemisorption of CO2 at room temperature combined with a clay which acts as an agglomerant in a preferred weight ratio of 80/20. The carbon dioxide is liberated under heating at 110°C. The surface area of the material ranges between about 120 and about 240 m2/g with a total pore volume between about 0.4 and about 0.8 cc/g where about 80% of the total pore volume contains pores of a diameter between about 60 Åand about 180 Å. The material is capable of adsorbing between about 7.5 and 11.7 cc of dry CO2 per gram and can be regenerated between about 70°and about 150°C. without losing any adsorptive capacity. Dry carbon dioxide is chemisorbed as a surface ammonium carbamate which becomes a surface bicarbonate in the presence of water.

대표청구항 ▼

A method for producing a reversible adsorbent having between about 2.0 and 3.0 molecules of modifying agent per square nanometer and displaying near infrared bands at 7220, 6720, 6557, 5970-5480, 5270, 4945 and 4545 cm-1 for use in the removal of carbon dioxide comprising the steps of: providing a s

A method for producing a reversible adsorbent having between about 2.0 and 3.0 molecules of modifying agent per square nanometer and displaying near infrared bands at 7220, 6720, 6557, 5970-5480, 5270, 4945 and 4545 cm-1 for use in the removal of carbon dioxide comprising the steps of: providing a silica gel; providing a clay material; mixing said silica gel with said clay material to obtain a material containing between about 10 wt. % and about 30 wt. % of clay; forming an extruded solid material from said silica gel-clay material; and treating said extruded solid material in a solution containing a surface modifying agent so as to modify chemically the surface of said extruded solid material and thereby form said reversible adsorbent for removing carbon dioxide.