Adsorbents, methods of preparation, and methods of use thereof
2 Assignments
0 Petitions
Accused Products
Abstract
Adsorbents and methods of use thereof are provided. One representative, among others, includes an adsorbent having an alkali metal promoted, mixed trivalent layered double hydroxide (LDH) composition. When the mixed trivalent layered double hydroxide (LDH) composition is heated to a temperature ranging from about 300° C. to 450° C., an the adsorbent having an adsorption capacity of at least 0.8 millimoles of CO2 adsorbed per gram of adsorbent is formed.
-
Citations
31 Claims
-
1-10. -10. (canceled)
-
11. An adsorbent comprising an alkali metal promoted, mixed trivalent layered double hydroxide (LDH) composition, wherein the mixed trivalent layered double hydroxide (LDH) composition is heated to a temperature ranging from about 300°
- C. to 450°
C. to provide the adsorbent, and wherein the alkali metal promoted, mixed trivalent metal LDH composition has the following general formula;
[M11-x(M2yM3(1-y))x(OH)2(A)x/2.zH2O].v[M4wCO3]wherein the subscript “
x”
is a number between 0 an 1;
the subscript “
y”
is a number ranging from greater than 0 to about 0.05;
“
z”
is a number ranging from 0 to about 8;
the subscript “
w”
is the integer 1 or 2, wherein when “
w”
is the integer 1 the CO3 becomes HCO3;
“
v”
is a number ranging from 0 to about 0.01;
“
M1”
is a divalent metal selected from magnesium (Mg), calcium (Ca), strontium (Sr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn);
“
M2” and
“
M3”
are each a trivalent metal selected from aluminum (Al), chromium (Cr), Mn, Fe, Co, lanthanum (La), cerium (Ce), galium (Ga), indium (In), the lanthanide series of metals, and mixtures thereof;
“
A”
is an anion selected from CO3, SO4, and HPO4; and
“
M4”
is an alkali metal selected from sodium (Na), potassium (K), robidium (Rb), cesium (Cs), and lithium (Li).- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- C. to 450°
-
21. A method of separating carbon dioxide from a gas mixture comprising carbon dioxide and water vapor, the method comprising:
-
providing at least one adsorption zone comprising an alkali metal promoted, trivalent metal layered double hydroxide (LDH) adsorbent having an adsorption capacity of at least 0.8 millimoles of CO2 adsorbed per gram of LDH adsorbent;
passing the gas mixture comprising water vapor and carbon dioxide through the at least one adsorption zone wherein the alkali metal promoted, mixed trivalent metal LDH adsorbent adsorbs at least part of the carbon dioxide from the mixture to provide a carbon dioxide-depleted gas; and
regenerating the alkali metal promoted trivalent metal LDH adsorbent to provide a a carbon dioxide-rich gas. - View Dependent Claims (22, 23, 24, 25)
-
-
26. A method of separating carbon dioxide from a gas mixture using an adsorption process comprising:
-
passing the gas mixture comprising water vapor through at least one adsorption zone comprising an alkali metal promoted, mixed trivalent metal layered double hydroxide (LDH) adsorbent wherein the adsorption zone being at a first temperature and a first pressure, and wherein the alkali metal promoted, mixed trivalent metal LDH adsorbent adsorbs at least part of the carbon dioxide from the gas mixture;
separating a portion of the carbon dioxide from the gas mixture to form a carbon dioxide-depleted gas; and
regenerating the alkali metal promoted, mixed trivalent metal LDH adsorbent, wherein the adsorption zone being at a second temperature and a second pressure. - View Dependent Claims (27, 28, 29, 30)
-
-
31-32. -32. (canceled)
Specification