Chemical-looping
combustion (CLC) is mainly proposed for a circulating fluidized bed (CFB) using
various fluidizing gases such as carbon dioxide (CO2) or steam (H2O).
CO2 in the CLC is also a reactant and the process may be considered
as CO2 utilization. Prior
studies showed that bimetallic Cu-Fe oxygen carriers (OC) had higher
reactivities compared to monometallic iron oxide. In this study, the
Cu-Fe OCs with an inert support silicon dioxide (SiO2) or zirconium
dioxide (ZrO2) were synthesized using high pressure pelletization followed by calcination at 950 or 1100oC.
Reactivities of the OCs with coal char and their CO2 conversion
efficiency were investigated at 950 and 1050oC in multiple-cycle tests
under a CO2 gas environment. The OCs with a ZrO2 support can
be tested at a higher temperature than those with an SiO2 support due
to problems associated with sintering of SiO2-supported OCs when calcined
at 1100˚C. Results show high carbon conversions, carbon conversion rates, CO2
conversion efficiencies and cyclabilities of the combined Cu-Fe OCs with the
char under CO2.
Presenter(s)
Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits.
If you have already viewed this content,
please click here
to login.