(420a) Calcium Oxide Based Sorbents for Adsorption of CO2 at High Temperatures | AIChE

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(420a) Calcium Oxide Based Sorbents for Adsorption of CO2 at High Temperatures

Authors 

Reddy, E. P. - Presenter, University of Cincinnati
Smirniotis, P. (. - Presenter, Department of CME, University of Cincinnati
Lu, H. - Presenter, University of Cincinnati


Ca(NO3)2·4H2O,
CaO, Ca(OH)2, CaCO3, and Ca(CH3COO)2
·H2O were used as precursors for synthesis of calcium oxidesorbents
of CO2. Calcium acetate based sorbents resulted in the best
adsorption performance of CO2.In a wide operation window
of 600-800oC, this sorbent has shown high adsorption of CO2,
90% of which were achieved at the first 15 minutes of adsorption period.
Calcium acetate based sorbents also showed great regenerability in multi
adsorption-desorption cycles. After 25 cyclic adsorptions/desorption, the
sorbent still had a conversion of 64% during adsorption of CO2. High
conversion and good regenerability of calcium acetate based sorbents are attributed
to relatively large volume of mesopores and macropores produced during multi
steps decomposition of synthesis. Sorbents from other precursors showed poorer
performance since they had smaller pores, less pore volume and lower BET
surface area. These high performance calcium oxide sorbents have great
potential for numerous high temperature applications such as fuel cells, carbon
sequestration, novel reactors, and coal gasification etc.

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