TITLE:
Adsorption of Light Hydrocarbons on LTA and FER Zeolites
AUTHORS:
Fortunato Migliardini, Fabio Iucolano, Domenico Caputo, Pasquale Corbo
KEYWORDS:
Hydrocarbon Adsorption; Hydrocarbon Trap; Ferrierite; Linde 5A; Engine Cold Start Emissions
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.7A,
July
12,
2013
ABSTRACT:
This paper reports the results of an experimental study
on adsorption of light hydrocarbons on small pore microporous materials. The
choice of hydrocarbons studied was affected taking into consideration the
application of adsorption processes in removal of light hydrocarbons from
exhaust streams of the petrochemical industry and of light-duty gasoline
vehicles under cold start conditions (C4-C5
paraffins and olefins). The materials investigated were 5A and Ferrierite zeolites, characterized by different
pore opening and Si/Al ratio. Equilibrium isotherm curves at room temperature
were determined by a gravimetric method on dehydrated zeolites, while
breakthrough curves in dynamic tests were used to evaluate the adsorption
properties of hydrated zeolites at low hydrocarbon partial pressure (0-1 kPa)
and in experimental conditions close to those of a HC trap at the engine exhaust.
The experimental results regarding the adsorption capacities were discussed
with the aim to understand how the physico-chemical characteristics of the
adsorbent material could affect its trapping capability in adsorbing different types of
hydrocarbons.