Chemical Looping Combustion (CLC) is an efficient CO2 capture technology. There is hardly any efficiency penalty, because of the atmospheric separation of air and combustion via metal oxides. Although the gas-fuelled technology is high developed, there are still major challenges with solid-fuels. The metal oxide, which is also called the oxygen carrier, is at the centre of interest. He delivers oxygen through a dual-fluidized bed, which is required for combustion free of interfering gases. The product of the reaction contains only CO2 and water vapour de-pending on the fuel. While condensing the water vapour, highly concentrated CO2 could be generated. In terms of size, the experimental reactor for CLC treated in this work, forms the missing link between pilot plants and smaller laboratory units. Rapid testing of new fuel and oxygen carri-ers proves to be expensive and costly in large plants. The adopted reactor is running in batch mode as a simple fluidized bed. Experimental parameters and characteristics of oxygen carriers can be researched at lower costs. For this purpose, there will be adaptations for the new operating Batch-reactor and also research for suitable operating conditions to approximate the results to large-scale units. The experiments show that the fluidization and the choice of fuel and oxygen carriers are most influencing to the progress of the reaction. There are CO2 conversion rates up to 80% achieved by using Braunit and Ilmenite as oxygen carriers. The experimental results in the Batch-reactor allow trends to be transferred to an 80kW solid fuel plant. In summary, in over 200 operating hours, the most important parameters and their effects can be identified. A transfer of results to a large plant is possible, but for an exact scale-up more experimental data is necessary.