Carbon dioxide capture using high silicon low aluminum co2-selective adsorbent

A method for separating carbon dioxide from a gas stream containing carbon dioxide and water, the method comprising:

• performing a plurality of adsorption and desorption cycles, wherein each adsorption cycle comprises contacting an adsorbent with the gas stream where the adsorbent is a low aluminum pentasil zeolite having a silicon-to-aluminum molar ratio greater than 500:1, or being substantially aluminum-free, under conditions effective to cause the adsorbent to adsorb carbon dioxide and water from the gas stream to provide an adsorbed amount of carbon dioxide and an adsorbed amount of water on the adsorbent, and each desorption cycle comprises releasing substantially all of the adsorbed amount of carbon dioxide and substantially all of the adsorbed amount of water from the adsorbent;
• and
• wherein the adsorbent exhibits a carbon dioxide adsorption capacity that does not substantially decrease between each of the plurality of adsorption and desorption cycles.

A method for separating carbon dioxide from a gas stream containing carbon dioxide and water, the method comprising:

• contacting an adsorbent with the gas stream where the adsorbent has a low aluminum content defined by a silicon-to-aluminum molar ratio greater than 500:1, or being substantially aluminum-free, under conditions effective to cause the adsorbent to adsorb carbon dioxide from the gas stream;
• and
• subsequently performing a desorption step to release the adsorbed carbon dioxide and regenerate the adsorbent.