Assistant Dr. Ziad Tariq Ahmed, an instructor at the department of biochemical engineering, University of Baghdad published a research entitled (Preparation of catalyst and its impact of purity of oily rocks for biodiesel production) in (Fuel) journal, Netherlands that is included within (Thomson Reutors). It is worth mentioning the Dr. Ziad has previously published another research the British journal (Renewable Energy) on (the production of biodiesel).