CaxLa1−xMn1−yMyO3−δ (M = Mg, Ti, Fe or Cu) as Oxygen Carriers for Chemical-Looping with Oxygen Uncoupling (CLOU)
Journal article, 2013

Perovskite materials of the type CaxLa1−xMn1−yMyO3−δ (M = Mg, Ti, Fe or Cu) have been investigated as oxygen carriers for the chemical-looping with oxygen uncoupling (CLOU) process. The oxygen carrier particles were produced by mechanical homogenization of primary solids in a rotary evaporator followed by extrusion and calcination at 1300°C for 6 h. The chemical-looping characteristics of the substituted perovskites developed in this work were evaluated in a laboratory-scale fluidized-bed reactor in the temperature range of 900−1000°C during alternating reducing and oxidizing conditions. The oxygen carriers showed oxygen releasing behaviour (CLOU) in inert atmosphere between 900−1000°C. In addition, their reactivity with methane was high, approaching complete gas yield for all of the materials at 950°C, the exception being the Cu-doped perovskite which defluidized during reduction. The rates of oxygen release were also investigated using devolatilized wood char as solid fuel, and were found to be similar. The required solids inventory in the fuel reactor for the perovskite oxygen carriers is estimated to be 325 kg/MWth. All of the formulations exhibited high rates of oxidation and high degree of stability with no particle fragmentation or agglomeration. The high reactivity and favourable oxygen uncoupling properties make these oxygen carriers promising candidates for the CLOU process.

chemical-looping combustion (CLC)

CO2-capture

perovskite

chemical-looping with oxygen uncoupling (CLOU)

oxygen carrier

Author

Mehdi Arjmand

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Ali Hedayati

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Abdul-Majeed Azad

University of Toledo

Chalmers

Henrik Leion

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Magnus Rydén

Chalmers, Energy and Environment, Energy Technology

Tobias Mattisson

Chalmers, Energy and Environment, Energy Technology

Energy & Fuels

0887-0624 (ISSN) 1520-5029 (eISSN)

Vol. 27 8 4097-4107

Novel combustion principle with inherent capture of CO2 using combined manganese oxides that release oxygen (NOCO2)

European Commission (FP7), 2012-03-01 -- 2017-02-28.

Areas of Advance

Energy

Subject Categories

Other Chemical Engineering

DOI

10.1021/ef3020102

More information

Latest update

9/10/2018