Many research works are being carried out to enhance the performances of internal combustion engines to meet out
the current energy demand and to reduce the emission with the alternate fuels. Energy production is heavily dependent on fossil
fuels that are not only diminishing, but also are considered the main cause of harmful emissions and global warming. Therefore
using vegetable oils such as Jatropha, palm, algae and waste cooking oils as alternative fuels in diesel engines has drawn a great
attention. Biodiesel from Jatropha, palm, algae and waste cooking oils is produced using the transesterification process.
Biodiesel fuel is one of the environmentally friendly alternative energy that can reduce toxic gas emissions and at the same time
reduces dependence on petroleum-based fuels. Therefore, the purpose of this paper is to provide a comprehensive review of
biodiesel as an alternative fuel for diesel engine applications. A significant number of literatures from various journals were
cited accordingly.
