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

Table 2

Composition and sources of hydrocarbon mixtures used for adsorption tests (provided by Praxair).

Mixture HC/N2	Composition of individual HC, ppm	Total concentration, C3 ppm
Ethylene/N2	1280	853
Isobutene/N2	643	857
Toluene/N2	358	835
C4-C5 alkanes^a/N2	n-Butane: 123	847
	Isobutane: 128
	n-Pentane: 105
	Isopentane: 102
	Neopentane: 100
	C5: 102
Isobutane-isobutene^b/N2	Isobutane: 323	858
	Isobutene: 320

Equimolar mixture (as C3) of n-butane, isobutane, n-pentane, isopentane, and neopentane.
^bEquimolar mixture (as C3) of isobutane and isobutene.