Cetane Number Improvement Of Diesel Fuels By Oxidation Of Their Own Components Over Supported HPA Catalysts

In the work, different sorts of supported HPA catalysts were synthesized using impregnation method. X-ray diffraction was utilized to ascertain the structure of the supports and catalysts; N₂-physical adsorption-desorption was used to confirm BET surface area and pore size of the different supports and catalysts; FT-IRwas also employed to characterize the structure of the supports and catalysts; TG-DTA was used to measure the dehydration of the catalysts in order to investigate the structure. The results indicate that SiO₂ and SBA-15 are amorphous and HPA are dispersed very well on the supports; all the supports and catalysts have a narrow pore distribution; supported HPA catalysts hold a Keggin type heteropoly anion structure.In a batch stirred reactor, the partial oxidation of 2-methylcyclohexanone was chosen as a model reaction to evaluate the activity of the catalysts. The results indicate that silica is the best support; the best calcination temperature is 200℃; 20% is the best loading level of HPA on silica; 235.0 mmol/L is the best initial concentration of 2-methylcyclohexanone.With Ignition Quality Tester (IQTTM), under ASTM D6890 standard, Cetane Number of the reactant and product were tested by Advanced Engine Technology (AET). The results indicate that 2-methylcyclohexanone decreased the Cetane Number of the system while the product methyl 3-oxoheptanoate improved it. After partial oxidation of 2-methylcyclohexanone, the Cetane Number of the system improves. Moreover, the Cetane Number of 2-methylcyclohexanone and 3-oxoheptanoate were obtained through calculation based on test results.