700 u00b0 c for a period of 6 h the nickel particles were deposited on the synthesized support via organic matrix decomposition method in a typical procedure a 500 ml solution of 0 3099 g of nickel nitrate hexahydrate 2 g of the calcined support and a 0 32 g 500 ml solution of urea were mixed and stirring at 95 u00b0 c for 48 hrs the obtained material was filtered and calcined at 400 u00b0 c for 6 hrs the obtained catalyst was denoted as vmgx where u201c x u201d is the of mgo present in the catalyst in the present case three different types of catalyst named vmg1 vmg2 and vmg3 contains 1 0 01 g 2 0 020 g and 3 0 030 g of magnesium nitrate hexahydrate with respect to the supporting material alumina by calcined aluminium isopropoxide gives alumina which on calcination turned to magnesium oxide anhydrous aluminium isopropoxide 4 1 g was dissolved in a mixture of ethanol 50 ml and concentrated nitric acid 50 ml and kept for 8 hr under vigorous stirring at room temperature 25 u00b0 c a second solution containing poly ethylene glycol block poly propylene glycol block poly ethylene glycol 2 g was dissolved in ethanol 50 ml magnesium nitrate hexahydrate 0 1953 g was added into the solution respectively then the two solutions was mixed and stirred for 8 h at room temp 25 u00b0 c for.