Alberto Abad focused his research activity mainly on advanced and clean combustion and gasification processes in fluidized bed reactors, such as oxy-fuel combustion and chemical looping processes to produce energy, syngas or hydrogen with CO2 capture. He shows an intensive activity in the development of chemical looping technologies, mainly focused on the development of oxygen carriers, reaction kinetics determination, the design and operation of pilot plants, as well as the modelling of chemical looping units based on interconnected fluidized bed reactors. In the last years, he has focused on the use of biofuels in bioenergy or green hydrogen generation with CO2 capture to achieve CO2 removal.