Patent · US Active

Microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure and methods of making and using same

US7645718B2 · kind B2 · utility

19Cited by

16References

30Claims

0Family size

Assignee

PQ Corporation · US

Inventors

Hong-Xin Li · Allentown, US
William E. Cormier · Lansdale, US
Bjorn Moden · West Chester, US

Key dates

Filing date	Mar 26, 2008
Grant date	Jan 12, 2010
Priority date	—
Expiry date	Mar 26, 2028

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2229/18
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

There is disclosed a hydrothermally stable microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure, such as SAPO-34 or aluminosilicate zeolite, able to retain a specific percentage of its surface area and micropore volume after treatment with heat and moisture, such as at least 80% of its surface area and micropore volume after exposure to temperatures of up to 900° C. in the presence of up to 10 volume percent water vapor for a time ranging from 1 to 16 hours. Methods of using the disclosed crystalline material, such as in the SCR of NOx in exhaust gas are also disclosed, as are methods of making such materials.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.