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Nanocomposite MFI-Alumina Hollow Fiber Membranes: Influence of NOx and Propane on CO2/N2 Separation Properties
journal contribution
posted on 2012-08-08, 00:00 authored by C−H. Nicolas, M. Pera-TitusThis study provides a detailed survey of the effect of
moisture,
NOx and light hydrocarbons (i.e., propane)
on the CO2/N2 permeation and separation properties
of MFI-type hollow-fiber membranes in view of on board CO2 capture applications in Diesel vehicles. Five different MFI-alumina
samples have been prepared including different degrees of isomorphous
boron and germanium substitution, as well as ex framework proton exchange
by copper. The quality of the synthesized hollow fibers has been primarily
assessed by pure N2 permeation and n-butane/H2 and SF6/N2 separation at room temperature.
The different materials show preferential CO2/N2 and CO2/NO selectivity at low CO2 feed concentrations
(∼10%) in the temperature range 298–373 K, which can
be appreciably promoted under the presence of propane (1 v/v %). The
materials show stable and high CO2 permeances even in the
presence of large amounts of water in the feed stream. On the basis
of the permeation and separation data measured in this study, we present
a refined simulation study of a membrane cascade system constituted
of two hollow-fiber membrane modules coupled to a DeNox unit for on
board CO2 capture and liquefaction/supercritical storage
in heavy vehicles (>40 tn).