| 摘要 |
There is disclosed a hydrothermally stable microporous crystalline materi al comprising a molecular sieve or zeolite having an 8-ring pore opening str ucture, such as SAPO-34 or aluminosilicate zeolite, able to retain a specifi c percentage of its surface area and micropore volume after treatment with h eat and moisture, such as at least 80% of its surface area and micropore vol ume after exposure to temperatures of up to 900 0C 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 e xhaust gas are also disclosed, as are methods of making such materials.
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