Production of Biodiesel from Waste Cooking Oil

The overconsumption of conventional petroleum fuels contributes to the faster depletion of existing fuel reserves and a substantial price hike in petroleum crude oil prices. Thus, there is a solid demand to identify sustainable and adequate alternatives for traditional ongoing conventional petroleum-based fuels. The selection of a suitable alternative energy depends on its ready availability, renewability, and lowering pollution. Biodiesel has attracted immense popularity among renewable fuels due to its environment-friendly and non-toxic characteristics. Biodiesel is manufactured utilizing different types of feedstock, catalysts, and technologies. A feedstock that is waste could be a superior choice to produce biodiesel. Therefore, the authors have chosen waste cooking oil as feedstock to review in this book chapter. This review systematically investigates biodiesel production from different kinds of waste cooking oils. Further, it provides detailed knowledge of various methodologies to prepare waste cooking oil-based biodiesel, the addition of several nanocatalysts, the advantages and disadvantages of using this particular feedstock, and recent trends and challenges in this field.