Engineering the Si/Al ratio of MWW zeolites for propylene/propane separation

Open Access

Table 1

Textural properties

Sample	Element content^a (wt%)			Si/Al	Na/Al	Chemical formula	Crystal system	Space group	S_BET^b (m² g⁻¹)	V_p^c(cm³ g⁻¹)	D^d(nm)
Sample	Na	Al	Si	Si/Al	Na/Al	Chemical formula	Crystal system	Space group	S_BET^b (m² g⁻¹)	V_p^c(cm³ g⁻¹)	D^d(nm)
MCM-22(15)	0.34	3.9	39.1	9.6	0.10	[Na_0.68H_6.12] [Al_6.8Si_65.2O₁₄₄]	Hexagonal	P6/mmm	546	0.23	0.83
MCM-22(30)	0.14	2.0	40.0	18.7	0.08	[Na_0.29H_3.41] [Al_3.7Si_68.3O₁₄₄]	Hexagonal	P6/mmm	594	0.26	0.90
MCM-22(60)	0.03	1.1	41.9	36.5	0.03	[Na_0.06H_1.84] [Al_1.9Si_70.1O₁₄₄]	Hexagonal	P6/mmm	550	0.23	0.88

^a Measured by XRF. ^b BET surface area. ^c Total pore volume. ^d Average pore width.

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