Performance of a perovskite-structured calcium manganite oxygen carrier produced from natural ores in a batch reactor and in operation of a chemical-looping combustion reactor system
Journal article, 2024

The potential for low cost of CO2 capture using chemical-looping combustion (CLC) should not be compromised by costs associated with the oxygen carrier. This justifies studies of oxygen carrier materials with reasonable production costs. In this study, a perovskite calcium manganite (CaMnO3-δ), was synthesized from manganese ore and limestone through a straightforward process involving mixing with polyvinyl-alcohol, sintering, crushing and sieving. The calcium manganite produced exhibited two primary crystalline phases: CaMnO3 (perovskite) and CaMn2O4 (marokite). Experiments were conducted using both a batch fluidized-bed reactor and a 300 W CLC reactor system in continuous operation to assess the oxygen uncoupling and reactivity of the calcium manganite. The results show that the oxygen uncoupling ability increases with temperature. Full syngas conversion was achieved at relatively low temperatures and low fuel-reactor bed mass over fuel power ratio in the 300 W unit. Elevated temperatures and ratio of fuel-reactor bed mass over fuel power enhance methane conversion significantly. The attrition of the calcium manganite was low, around 0.1 wt%/h for the last 15 h operation with methane. Batch reactor tests of fresh and used materials showed that there was no reduction in reactivity after 29 h of fuel operation.

Chemical looping with oxygen uncoupling

Manganese ore

Oxygen carrier

Perovskite structure

Simple production method

Calcium manganite

Author

Xiaoyun Li

Chalmers, Space, Earth and Environment, Energy Technology

Robin Faust

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Victor Purnomo

Chalmers, Chemistry and Chemical Engineering, Energy and Material

Daofeng Mei

CSIC - Instituto de Carboquimica (ICB)

Carl Johan Linderholm

Chalmers, Space, Earth and Environment, Energy Technology

Anders Lyngfelt

Chalmers, Space, Earth and Environment, Energy Technology

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology

Chemical Engineering Journal

13858947 (ISSN)

Vol. 497 154516

Subject Categories

Energy Engineering

Chemical Process Engineering

Materials Chemistry

DOI

10.1016/j.cej.2024.154516

More information

Latest update

8/23/2024