Refinery distillation units separate crude oil into light, medium and heavy fractions. After that, refiners start performing chemical reactions using catalysts — materials that accelerate chemical reactions — to change the oil’s natural molecules into the forms needed in modern fuels. In recent years, refiners have stepped up their efforts to recycle those catalysts to improve their profitability and environmental performance. In today’s RBN blog, we explain how catalysts, which were formerly disposed of as hazardous waste, are increasingly being recycled and reused in refineries.