Key Words:Aluminum compounds;Combustion - Energy efficiency - Hematite - Oxygen - Pore size - Sintering;Chemical looping combustion - H2 temperature-programmed reduction - High energy efficiency - Reduction reaction - Sintering resistance - Solution combustion - Structural characteristics - Weight loss rates

Abstract:Chemical looping combustion (CLC) is an attractive technology for CO<inf>2</inf>capture with high energy efficiency. In this article, an Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>(Fe:Al = 3:1) oxygen carrier was first prepared by the solution combustion approach for the CLC process. The prepared oxygen carrier was characterized by different means. XRD identification has substantiated the necessity of calcinations to synthesize Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>oxygen carrier. SEM and TEM images showed the regular spherical and cubical shape and abundant porous structure in Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>oxygen carrier, respectively. Structural characteristics displayed that the pore shape of Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>particles was heterogeneous. The average pore size and surface area were 64.76 nm and 4.01 m²/g, respectively. Further, H<inf>2</inf>temperature programmed reduction (TPR) of Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>oxygen carrier indicated that the reduction reaction had only one distinct DTG peak with the weight loss rate reaching 4.75 wt %/min. Finally, five cycles of red-ox reaction by alternating with CH<inf>4</inf>and air demonstrated that Fe<inf>2</inf>O<inf>3</inf>/Al<inf>2</inf>O<inf>3</inf>oxygen carrier had excellent reactivity and sintering resistance and consequently was capable of the CLC process. &copy; 2012 American Chemical Society.<br/>

Volume:51

Issue:39

Translation or Not:no