Research dataset is provided in support of the publication 'Pyrolysis of wood pellet in the presence of oxygen carriers in a fluidised bed coupled with a DBD reactor for tar quantification'. The dataset includes time-based mole fractions of products (CH4, CO and CO2) for the four bed materials (alumina sand, Fe2O3, mayenite-supporte CuO and Cu2O) which were collected from Fourier-transform infrared spectroscopy (FTIR), raw X-ray diffraction data (for fresh Fe2O3, mayenite-supported CuO and Cu2O), a txt file of various plasma power used for the experiments, and the calibrations of the analyser, FTIR (for CO, CO2 and CH4).