MFI and FAU-Type Zeolites as Trapping Materials for Light Hydrocarbons Emission Control at Low Partial Pressure and High Temperature

Table 4

Adsorption capacities (wt%) derived by breakthrough curves at various temperature values for different HCs on HZSM-5, silicalite, and HY. HC partial pressure: 0.1 kPa, space velocity: 30000 h⁻¹.

Zeolite	, K	Ethylene	Isobutene	Toluene	Isobutene	C4-C5 paraffins
					Isobutane
HZSM-5	298	0.5	2.2	4.0	4.1	1.7
	348	—	3.7	2.9	5.4	0.8
	373	0	4.5	—	5.4	0.2
	398	—	—	1.4	—	—
	413	—	4.6	—	4.0	—
	423	—	—	1.0	—	—
	463	—	2.4	—	1.6	—
	523	—	0.6	—	—	—
Silicalite	298	0.2	1.1	5.0		0.3
	373	0	0.5	2.5	—	—
	423	0	0.1	1.6	—	—
HY	298	0.04	2.8	6.8	—	0.7
	348	—	—	—	—	0.2
	353	—	6.3	—	—	—
	373	0	—	5.2	—	0.1
	403	—	4.5	—	—	—
	423	0	—	2.1	—	—