Manufacturing of perovskite oxygen carriers by spray granulation for chemical looping combustion

Chemical looping combustion is a technology under development allowing power production with inherent separation of CO2 during fuel combustion. Its principle relies on oxygen carrier materials which transport oxygen from the air to oxidise the fuel. One challenge is to develop and produce materials with suitable chemical and physical properties, low environmental impact, while minimising the production cost. Here we demonstrate that spray granulation, a scalable industrial process, is relevant to manufacture promising oxygen carrier materials from low cost and low environmental impact minerals and with good mechanical properties: Ca0.98Mn0.875Ti0.125O3 and Ca0.98Mn0.75Fe0.125Ti0.125O3. Iron substitution clearly reduces the sintering time. Increasing the calcination temperature and calcination time enhances the bulk density and resistance against physical attrition.