چكيده به لاتين
This study aimed to reduce the production of biodiesel combustion gases using metal nanoparticles. The nanoparticles used in this study include CeO2, Al2O3 and Co3O4. These nanoparticles were used separately, binary and triad compounds in three concentrations (25, 50 and 100 ppm) in pure biodiesel. The biodiesel used in this study was prepared from waste cooking oils. Then, after characterizing the produced biodiesel and determining the type and amount of methyl esters contained therein by gas chromatography (GC-FID), the effect of adding different nanoparticles including cerium oxide, alumina gamma oxide and cobalt oxide (CeO2, Al2O3 and Co3O4) to the neat biodiesel was evaluated in a combustion system to reduce its emissions. Nanoparticles play the role of catalysts in the combustion process, increasing the combustion speed and resulting in more complete combustion. These nanoparticles were used separately, binary and triple compounds at three concentrations (25, 50 and 100 ppm) in neat biodiesel. The results of biodiesel analysis produced by comparison with standard showed that the highest amount of methyl ester belonged to C16: 0 and C20: 0. For the experiments, a semi-industrial boiler and gas analyzer (Testo 350z) were used to calculate the amount of exhaust gas (CO, CO2 and NOX). The results showed that the CO gas produced by combustion of samples containing cerium oxide and cobalt oxide separately and their binary composition decreased relative to neat biodiesel, as well as the CO emission value for the ternary compound at 50 ppm. The percentage of neat biodiesel decreased by 40%. NOX emissions decreased for all samples (except the sample containing 25 ppm alumina) relative to pure biodiesel, with the highest reduction observed in samples containing cerium oxide and cobalt nanoparticles in a concentration of 100 ppm. In this case, NOX production decreased 39 percent over pure biodiesel. Concerning CO2 gas, the percentage of this gas in the flue exhaust for all samples (except the sample containing 25 ppm cerium and cobalt oxide) was higher than that of pure biodiesel.