Molecular sieve SSZ-95, method of making, and use

Patent metadata

Field	Value
Publication number	US-10272422-B2
Application number	US-201816108007-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	May 21, 2014
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A new crystalline molecular sieve designated SSZ-95 is disclosed. In general, SSZ-95 is synthesized from a reaction mixture suitable for synthesizing MTT-type molecular sieves and maintaining the mixture under crystallization conditions sufficient to form product. The product molecular sieve is subjected to a pre-calcination step, and ion-exchange to remove extra-framework cations, and a post-calcination step. The molecular sieve has a MTT-type framework and a H-D exchangeable acid site density of 0 to 50% relative to molecular sieve SSZ-32.

First claim

What is claimed is:

1. A molecular sieve having a MTT-type framework, a mole ratio of 20 to 70 of silicon oxide to aluminum oxide, a total micropore volume of between 0.005 and 0.02 cc/g; and a H-D exchangeable acid site density of up to 50% relative to SSZ-32.

2. The molecular sieve of claim 1 , wherein the molecular sieve has a mole ratio of 20 to 50 of silicon oxide to aluminum oxide.

3. The molecular sieve of claim 1 , wherein the molecular sieve has a total micropore volume of between 0.008 and 0.018 cc/g.

4. The molecular sieve of claim 1 , wherein the molecular sieve has an external surface area of between 200 and 250 m 2 /g; and a BET surface area of between 240 and 280 m 2 /g.

5. The molecular sieve of claim 1 , wherein the molecular sieve has a H-D exchangeable acid site density of 0.5 to 30% relative to molecular sieve SSZ-32.

6. The molecular sieve of claim 5 , wherein the molecular sieve has a total micropore volume of between 0.008 and 0.018 cc/g.

7. The molecular sieve of claim 5 , wherein the molecular sieve has an external surface area of between 200 and 250 m 2 /g; and a BET surface area of between 240 and 280 m 2 /g.

8. The molecular sieve of claim 1 , wherein the molecular sieve has a H-D exchangeable acid site density of 2 to 25% relative to molecular sieve SSZ-32.

9. The molecular sieve of claim 8 , wherein the molecular sieve has a total micropore volume of between 0.008 and 0.018 cc/g.

10. The molecular sieve of claim 8 , wherein the molecular sieve has an external surface area of between 200 and 250 m 2 /g; and a BET surface area of between 240 and 280 m 2 /g.

11. The molecular sieve of claim 1 , made by a process comprising the steps of:
(a) providing as-made, structure directing agent-containing molecular sieve SSZ-32x having a silicon-to-alumina ratio of 20 to 70;
(b) subjecting the molecular sieve to a pre-calcination step at a temperature below the full decomposition temperature of the structure directing agent, for a time sufficient to convert at least a portion of the structure directing agent to a decomposition residue;
(c) ion-exchanging the pre-calcined molecular sieve to remove extra-framework cations; and
(d) subjecting the molecular sieve to a post-calcination step at a temperature below the full decomposition temperature of the structure directing agent, for a time sufficient to convert at least a portion of the structure directing agent to a decomposition residue;
wherein the post-calcined molecular sieve has a cumulative weight loss (CWL) of 0<CWL≤10 wt. % and a total micropore volume of between 0.005 and 0.02 cc/g.

12. The molecular sieve of claim 11 , wherein the post-calcined molecular sieve has a cumulative weight loss of between 4 and 9 wt. %.

13. The molecular sieve of claim 11 , wherein the post-calcined molecular sieve has a cumulative weight loss of between 5 and 8.5 wt. %.

14. The molecular sieve of claim 11 , wherein the molecular sieve has a total micropore volume of between 0.008 and 0.018 cc/g.

15. The molecular sieve of claim 11 , wherein the molecular sieve has an external surface area of between 200 and 250 m 2 /g; and a BET surface area of between 240 and 280 m 2 /g.

Assignees

• Ojo Adeola Florence
• Zhang Yihua
• Lei Guan Dao
• Zones Stacey Ian
• Chevron Usa Inc

Inventors

• Ojo Adeola Florence
• Zhang Yihua
• Lei Guan-Dao
• Zones Stacey Ian

Classifications

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title

• B01J37/082

  Decomposition and pyrolysis · CPC title

• C01P2006/14

  Pore volume · CPC title

• B01J2229/24

  to stabilize the molecular sieve structure · CPC title

• B01J35/1019

  Operations & Transport · mapped topic