Zeolite Y: Synthesis, Modification, and Properties—A Case Revisited

Table 1

Si/Al values of zeolites NaY, HY, and DAY dealuminated for 5 h in steam.

Sample	Temperature K	Si/Al ratio
		𝑎0 (2)	𝑤DR (3)	𝑤TOT (4)	NMR (5)
NaY	—	2.8	2.8	2.8	2.9
HY	543	2.8	2.9	2.8	2.8
DAY	773	3.8	4.0	7.9	8.2
DAY	873	4.4	5.0	8.9	8.7
DAY	973	5.2	6.7	10.8	11.8