CPC B01J 20/18 (2013.01) [B01D 53/02 (2013.01); B01J 20/186 (2013.01); B01J 20/28002 (2013.01); B01J 20/2808 (2013.01); B01J 20/28083 (2013.01); B01J 20/28085 (2013.01); B01D 53/047 (2013.01); B01D 53/0462 (2013.01); B01D 2253/108 (2013.01); B01D 2253/1085 (2013.01); B01D 2253/308 (2013.01); B01D 2257/504 (2013.01); B01D 2257/80 (2013.01); B01D 2258/0283 (2013.01); B01D 2258/05 (2013.01); Y02C 20/40 (2020.08)] | 10 Claims |
1. A method of removing carbon dioxide from a gas stream comprising carbon dioxide, the method comprising:
contacting a first gas stream comprising carbon dioxide with a carbon dioxide adsorbent comprising a hierarchical zeolite; and
adsorbing carbon dioxide from the first gas stream onto the carbon dioxide adsorbent, thereby removing some of the carbon dioxide from the first gas stream to yield a second gas stream, wherein the second gas stream has a lower concentration of carbon dioxide than the first gas stream,
wherein the hierarchical zeolite comprises anatase and defines:
micropores having a pore width between about 0.4 nm and about 2 nm; and
one or both of:
mesopores having a pore width between about 2 nm and about 50 nm; and
macropores having a pore width greater than about 50 nm.
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