反应详情

An ammoniumheptamolybdate solution was prepared by dissolving 4.63 g of ammoniumheptamolybdate in 20 mL of deionized water. The volume of the solutions was then adjusted to 25 mL with deionized water to provide an impregnating solution with a molybdenum concentration of 0.15 mol/L. The zeolite powder was shaped by compacting it at 250 bar. The obtained zeolite support was calcined at a temperature of 500° C. for 4 hours. Then, an impregnation solution comprising 6.34 mL of the above ammoniumheptamolybdate solution and 2.66 g of deionized water was prepared and used to impregnate 10 g of the zeolite support in a porcelain dish. The freshly impregnated support was manually mixed with a spatula and then aged for 0.5 hrs. Then, the impregnate was placed in a programmable oven and dried under dry air (1 L/min) by increasing the temperature from ambient to 70° C. at a rate of 1° C. per minute and by holding at temperature for 10 hours. Then, the temperature was increased using the same rate to 120° C. and held for another 10 hours. Finally, using the same rate, the temperature was increased to 500° C. and held for 5 hours. The finished catalyst was sieved to remove the fines and to obtain the desired 315-500 microns fraction. The catalyst had a molybdenum content of 6% wt.