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The influence of the physicochemical properties of a series of CaO catalysts   activated at different temperatures on the biodiesel production was   investigated. These catalysts show dissimilar yields in the   transesterification of triglycerides with methanol. We have found significant   relationships between structural properties (the type of the pore system, the   typical CaO crystal phase and the sizes of crystallites (up to 25 nm), the   minimal weight percentage of CaO phase, the total surface basicity and   potential existence of two types of basic active sites) of CaO prepared and   activated by means of thermal treatment at highest temperature and catalytic   efficiency. Benefits of this catalyst are short contact time, standard   operating temperature and atmospheric conditions, relatively low molar ratios   and small catalyst loading. These all together resulted in a very high   biodiesel yield of high purity. The properties of different biodiesel   (obtained with the use of the prepared CaO catalyst) blends with different   diesel and biodiesel ratios indicate that the higher the fraction of   biodiesel fuel the better the achieved fuel properties according to the EU   standards. A significant reduction of CO2 and CO emissions and only a   negligible NOx increase occurred when blends with an increased biodiesel   portion was used. The use of biodiesel derived blends, and the eventual   complete replacement of fossil fuels with biodiesel as a renewable,   alternative fuel for diesel engines, would greatly contribute to the   reduction of greenhouse gases emissions. [Projekat Ministarstva nauke   Republike Srbije, br. ON 172061 i TR 34008

Significance of the structural properties of CaO catalyst in the production of biodiesel: An effect on the reduction of greenhouse gases emission