Modified Chabazite Adsorbent Compositions, Methods of Making and Using Them

Patent metadata

Field	Value
Publication number	US-2017239641-A1
Application number	US-201615049659-A
Country	US
Kind code	A1
Filing date	Feb 22, 2016
Priority date	Feb 22, 2016
Publication date	Aug 24, 2017
Grant date	—

Abstract

A method for preparing an adsorbent is disclosed that includes mixing an NaY zeolite, aqueous Al(OH) 3 , and aqueous KOH, and then heating the resultant mixture for an allotted amount of time to achieve a composition comprising at least 90% single phase chabazite having an Si/Al ratio of 1.0 to 2.2.

First claim

What is claimed is:

1 . A method for preparing an adsorbent, comprising:
(a) mixing NaY zeolite, aqueous Al(OH) 3 , and aqueous KOH; and (b) heating the resultant mixture of step (a) for an allotted amount of time to achieve a composition comprising at least 90% single phase chabazite having an Si/Al ratio of 1.0 to 2.2.

2 . The method of claim 1 , wherein the single phase chabazite comprises a potassium cation with a K:Al molar ratio of at least 0.90.

3 . The method of claim 1 , wherein the heating of step (b) is to about 70° C. to 120° C. and further comprises holding the temperature between 70° C. to 120° C. for 1-8 days.

4 . The method of claim 1 , wherein the heating of step (b) is to about 90° C.-100° C. and further comprises holding the temperature between 90° C. to 100° C. for 1-8 days.

5 . The method of claim 1 , further comprising conducting an ion exchange of the single phase chabazite to yield a single phase NaCHA composition having an Si/Al ratio of 1.0 to 2.2, wherein the Na/Al molar ratio is greater than 0.95.

6 . The method of claim 5 , wherein conducting the ion exchange comprises mixing the composition comprising at least 90% single phase chabazite having an Si/Al ratio of 1.0 to 2.2 with a 1M aqueous solution of NaCl having a 10-fold excess, by mole % of NaCl relative to the moles of potassium cations in the single phase composition until the K is fully exchanged by Na to yield a single phase NaCHA composition.

7 . The method of claim 5 , wherein the single phase NaCHA composition is further ion exchanged to yield a single phase mixed cation CHA including at least two types of cations.

8 . The method of claim 7 , wherein each of the at least two types of cations are in a molar ratio relative to Al of at least 0.05.

9 . The method of claim 5 , further comprising conducting a subsequent ion exchange of the NaCHA composition with an aqueous solution of one or more of Li, Ag, K, Ca, Mg, Zn, Cu, Ba, and Sr cations.

10 . The method of claim 5 , further comprising conducting a subsequent ion exchange of the NaCHA composition with an aqueous solution of Li cations, K cations, or combinations thereof.

11 . The method of claim 5 , further comprising conducting a subsequent ion exchange of the NaCHA composition with an aqueous solution of Li cations to yield a Li,NaCHA composition.

12 . The method of claim 11 , wherein each of the two types of cations of the Li,NaCHA composition are in a molar ratio relative to Al of at least 0.05.

13 . The method of claim 5 , further comprising conducting a subsequent ion exchange of the NaCHA composition with an aqueous solution of K cations to yield a K,NaCHA composition.

14 . The method of claim 13 , wherein each of the two types of cations of the K,NaCHA composition are in a molar ratio relative to Al of at least 0.05.

15 . The method of claim 5 , wherein one equivalent of the NaCHA composition is ion exchanged with a equivalents of K cations in aqueous solution to yield an aK,NaCHA having a K:Na ratio of a:(b−a), where a is the desired number of potassium cations and b is the total number of cations per unit CHA, where the range of b is 11.25 to 18

16 . The method of claim 15 , wherein b is 12 to 18 and a is 1 to 7.

17 . The method of claim 15 , wherein b is about 12.8 to 15.3 and a is 1 to 7.

18 . The method of claim 17 , wherein the mixed cation exchanged chabazite is 1K,NaCHA; 2K,NaCHA; 3K,NaCHA; 4K,NaCHA; or 6K,NaCHA.

19 . The method of claim 1 , wherein the chabazite has a Si/Al ratio from 1.35 to 1.6.

20 . The method of claim 1 , wherein the chabazite has a Si/Al ratio from 1.0 to 2.0.

Assignees

• Air Prod & Chem

Inventors

• Coe Charles Gardner
• Ochs Geoffrey John
• Bonanno Marissa Ann
• Bongo Christopher Robert
• Casteel Jr William Jack
• Lau Garret Chi-Ho
• Zhao Qiao
• Whitley Roger Dean
• Sorensen Erin Marie

Classifications

• B01D2256/18

  Noble gases · CPC title

• B01J20/186

  Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity · CPC title

• C01B39/46

  Other types characterised by their X-ray diffraction pattern and their defined composition {(C01B39/023, C01B39/026, C01B39/06 take precedence)} · CPC title

• B01D2253/108

  Zeolites · CPC title

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title