US 12,478,945 B2
Noxious gas purificant and its preparation and purification method thereof
Liwei Huang, Hangzhou (CN)
Filed by Liwei Huang, Hangzhou (CN)
Filed on Jun. 10, 2023, as Appl. No. 18/332,712.
Application 18/332,712 is a continuation of application No. 16/336,099, granted, now 11,911,740, previously published as PCT/CN2017/106121, filed on Oct. 13, 2017.
Claims priority of application No. 201610901763.2 (CN), filed on Oct. 14, 2016; application No. 201610901765.1 (CN), filed on Oct. 14, 2016; application No. 201610906056.2 (CN), filed on Oct. 17, 2016; application No. 201610906058.1 (CN), filed on Oct. 17, 2016; application No. 201610922408.3 (CN), filed on Oct. 20, 2016; application No. 201610939180.9 (CN), filed on Oct. 24, 2016; application No. 201710019937.7 (CN), filed on Jan. 1, 2017; and application No. 201710068265.9 (CN), filed on Feb. 2, 2017.
Prior Publication US 2024/0001332 A1, Jan. 4, 2024
Int. Cl. B01J 20/04 (2006.01); B01D 53/56 (2006.01); B01D 53/81 (2006.01); B01D 53/96 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); B01J 20/34 (2006.01)
CPC B01J 20/045 (2013.01) [B01D 53/565 (2013.01); B01D 53/81 (2013.01); B01D 53/96 (2013.01); B01J 20/28016 (2013.01); B01J 20/28045 (2013.01); B01J 20/3078 (2013.01); B01J 20/3433 (2013.01); B01J 20/3458 (2013.01); B01D 2253/112 (2013.01); B01D 2257/404 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A noxious gas purificant for the removal of nitrogen oxides from a gas stream at a temperature ranging from 150 to 550° C., wherein the preparation method of the purificant comprises following steps:
(1) mixing material U, material V according to stoichiometric reaction mole ratio and water in a mixing reactor, wherein said material U is at least one of the salts of sulfates and chlorides of component A, wherein component A is one of iron(II), iron(III), cobalt(II), manganese(II), copper(I), or copper(II) and said material V is (a) at least one of the hydroxides and carbonates of a component B, wherein component B is one of sodium, potassium and lithium, or (b) at least one of oxides, hydroxides and carbonates of a component F, wherein component F is one of calcium, barium and magnesium, or a combination of said (a) and (b); and
(2) molding a reaction product of step (1) to a shape of honeycombs, plates, granules, or loading on a general-purpose catalyst carrier;
(3) drying the reaction product at a temperature above 40° C.;
(4) activating the reaction product at a temperature above 150° C. after step (3); and
wherein the composition of the purificant comprises at least one component of the sulfates of sodium, potassium, lithium, calcium, barium and magnesium; or at least one component of the chlorides of sodium, potassium, lithium, calcium, barium and magnesium; or a combination of at least one of said sulfates or chlorides and the at least one of the carbonates of calcium, barium and magnesium.