Patent ID: 7157404

Claim:
A process for preparing hydrocarbons by hydrogenation of carbon dioxide performed by flowing a gas mixture (H 2 /CO 2 =1.0˜5.0 v/v) into the reactor at 200˜500° C., 1˜100 atm and 500˜20,000 h −1 of the space velocity over a catalyst, wherein said catalyst is a pretreated Fe—Cu—K/γ—A1 2 O 3 by reduction and activation, including 5˜50 wt. % of Fe to total catalyst weight and containing 0.07˜1 of weight ratio of K/Fe and 0.05˜0.5 of weight ratio of Cu/Fe, wherein said activation is performed by flowing a gas mixture (H 2 CO 2 =0.2˜10 v/v) on Fe—Cu—K/γ—Al 2 O 3 at 200˜400° C., 10˜40 atm and 2˜200 ml/g-cat./min of the flow rate and then flowing a gas selected from the group consisting of nitrogen, argon, and helium on said Fe—Cu—K/γ—Al 2 O 3 at 100˜400° C., 1˜10 atm, and 10˜100 ml/g-cat./min of the flow rate.