Analysis of Dynamic CO2 Capture over 13X Zeolite Monoliths in the
Presence of SOx, NOx and Humidity
Abstract
In this investigation, CO2 capture performance of zeolite 13X monoliths
with 600 and 800 cpsi in presence of SO2/NO impurities under dry and
humid conditions were evaluated and compared with that of 13X beads.
Dynamic breakthrough tests demonstrated a drastic reduction in CO2
capture capacity and deterioration of kinetics under dry-clean
conditions, whereas, upon switching the feed from a clean gas to
contaminated gas which contained SO2 and NO, different adsorption
performance was observed. Specifically, in dry-contaminated mode, the
adsorbents retained their capture capacities with comparable kinetics to
that of dry-clean feed conditions, however, in humid-contaminated mode,
the adsorbents experienced improved CO2 uptake and CO2/N2 selectivity,
albeit at the expense of deteriorated kinetics. These findings indicate
that the presence of SO2 and NO contaminants, especially SO2
contaminants, lead to dramatic changes in the adsorption performance of
zeolite 13X monoliths, indicating the importance of evaluating adsorbent
materials under realistic conditions.