Solid Fuel Conversion Via Chemical-Looping With Oxygen Uncoupling (CLOU) Using Co-Precipitation Derived Cu-Mn Oxygen Carriers

Innovations of Green Process Engineering for Sustainable Energy and Environment
AIChE Annual Meeting
November 7, 2013 - 1:00pm-1:15pm

Chemical-looping combustion (CLC) is an emerging CO2 capture and storage (CCS) technology. In CLC oxygen derived from a solid oxygen carrier is used to completely combust a (hydro-) carbonaceous fuel to CO2 and H2O. Thus , in CLC CO2 is inherently separated from the nitrogen in air. Conventional CLC for solid fuels requires a prior , relatively slow gasification step to produce a synthesis gas containing mostly CO and H2. An alternative strategy is chemical-looping with oxygen uncoupling (CLOU) [1]. Here , oxygen is released via a decomposition reaction , with the combustion reaction of the solid fuel with molecular oxygen being very fast. A suitable oxygen carrier for CLOU , typically a transition metal oxide , must possess a high oxygen storage capacity , thermal stability and fast decomposition kinetics at typical operating temperatures (800-1000 ˚C). In addition , resistance to attrition and agglomeration , cost and environmental impact have to be taken into account. With regards to equilibrium thermodynamics CuO and Mn2O3 are arguably the most attractive oxygen carriers for CLOU [1]. However , both copper and manganese have some drawbacks. For the CuO/Cu2O system , agglomeration and a comparatively low oxygen partial pressure (at temperatures below 850 ˚C) are the main disadvantages , whereas Mn2O3/Mn3O4 has a low oxygen storage capacity and at temperatures above 900 ˚C Mn3O4 is thermodynamically stable and cannot be re-oxidized back to Mn2O3 using air. In this study , mixed metal oxide oxygen carriers containing manganese and copper oxides were synthesized using a co-precipitation technique. The synthesized oxygen carriers were fully characterized and assessed with regards to solid fuel conversion under CLOU conditions. A comparison with the performance of the individual metal oxides revealed that the optimized Cu-Mn mixed oxides possessed an improved resistance to agglomeration , a higher oxygen carrying capacity , a high solid fuel conversion and an improved physical and chemical stability. These favorable characteristics make the newly developed Cu-Mn mixed oxides promising oxygen carriers for CLOU. Reference[1] Mattisson , T. , Lyngfelt , A. , Leion , H. , Int. J. Greenhouse Gas Control 2009 , 3 (1) , 11-19

Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access
Related Topics: