Synthesis and crystal structure of iron zeolitic frameworks

Patent metadata

Field	Value
Publication number	US-10207934-B2
Application number	US-201615218742-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	Jul 23, 2015
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

Iron-based crystal structures including FeO4 tetrahedrally coordinated in three dimensions in a framework analogous to a zeolite. The structures having the general formula AyB8Fe12O24(O/OH)6.xH2O in which A is Na, K, Cs, Rb or a combination thereof and B is an alkaline earth element or a combination of alkaline earth elements.

First claim

What is claimed:

1. An iron-based crystal structure having the formula:
B 8 (Fe 12-z D z O 24 )A y (O/OH) 6 .xH 2 O

In which:
A is Na, K, Cs, or a combination thereof;
1≤y≤6;
B comprises Be, Mg, Ca, Sr, Ba, or a combination thereof;
0≤x≤25;
D is an element that can take on tetrahedral coordination; and
0≤z≤about 6.

2. The iron-based crystal structure of claim 1 , wherein D is a main group element selected from Si, Ge, Al, Ga, P, As, and Zn.

3. The iron-based crystal structure of claim 1 , wherein D is a transition metal element or a mixture thereof.

4. The iron-based crystal structure of claim 3 , wherein D comprises V, Cr, Mn, Co, Ni, or Cu.

5. The iron-based crystal structure of claim 1 , wherein y is 1.

6. The iron-based crystal structure of claim 1 , wherein B is Ba or Sr.

7. The iron-based crystal structure of claim 1 , wherein A comprises Na, K, or a combination of Na and K.

8. The iron-based crystal structure of claim 7 , wherein A is a combination of Na and K, with Na having an atomic percent of A that is about 90% to about 99.5%.

9. The iron-based crystal structure of claim 1 , wherein A is a combination of Na and K, with Na having an atomic percent of A that is about 95% to about 99.5%.

10. The iron-based crystal structure of claim 1 , wherein 1≤x≤10.

11. The iron-based crystal structure of claim 1 , wherein A comprises Cs.

12. The iron-based crystal structure of claim 1 having the formula B 8 (Fe 12 O 24 )A y (O/OH) 6 .xH 2 O.

13. An iron-based crystal structure having the formula:
A y B 8 Fe 12 O 24 (O/OH) 6 .xH 2 O

In which
A is Na, K, Cs, or a combination thereof;
1≤y≤6;
B comprises Be, Mg, Ca, Sr, Ba, or a combination thereof; and
0≤x≤25.

14. The iron-based crystal structure of claim 13 , wherein y is 1.

15. The iron-based crystal structure of claim 13 , wherein B is Ba or Sr.

16. The iron-based crystal structure of claim 13 , wherein A comprises Na, K, or a combination of Na and K.

17. The iron-based crystal structure of claim 16 , wherein A is a combination of Na and K, with Na having an atomic percent of A that is about 90% to about 99.5%.

18. The iron-based crystal structure of claim 13 , wherein A comprises Cs.

19. The iron-based crystal structure of 13 , wherein 1≤x≤10.

20. The iron-based crystal structure of claim 13 , having the formula Na 2.84 Ba 8 Fe 12 O 24 (O/OH) 6 (H 2 O) 6.3 .

Assignees

• Univ South Carolina

Inventors

• Zur Loye Hans-Conrad
• Chance William Michael

Classifications

• C01B39/06

  Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements {, i.e. by direct or secondary synthesis} · CPC title

• C01B37/00

  Compounds having molecular sieve properties but not having base-exchange properties · CPC title

• C01B39/087

  Ferrosilicates · CPC title

• C01B39/00

  Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination (treatment to modify the sorption properties, e.g. shaping using a binder, B01J20/10; treatment to modify the catalytic properties, e.g. combination of treatments to make the zeolites appropriate to their use as a catalyst, B01J29/04; treatment to improve the ion-exchange properties B01J39/14) · CPC title

• C01B39/50 Primary

  Zeolites wherein inorganic bases or salts occlude channels in the lattice framework, e.g. sodalite, cancrinite, nosean, hauynite {(ultramarine C09C1/32)} · CPC title