2.1.1. Impregnation
KBr impregnated CaO catalyst was prepared by wet impregnation
method. CaO was impregnated with 25% of KBr. In the preparatory
method, 4 g of commercial CaO was dissolved in 40 ml of
distilled water and 1 g of KBr crystals was subsequently added to
it and stirred by magnetic stirrer. The stirring was done for 1 h
and 2 h to check the effect of time on the impregnation. The solution
was filtered using a filter paper (Whatmann 1) and dried in a
hot air oven to constant weight.