CATALYTIC CONVERSION OF CARBON-DIOXIDE INTO HYDROCARBONS OVER ZINC PROMOTED IRON CATALYSTS

The hydrogenation of carbon dioxide to hydrocarbons over iron catalyst s was studied in a fixed bed reactor under pressure of 10 atm and temp erature of 573 K. Iron catalysts promoted with V, Cr, Mn and Zn prepar ed by precipitation method were adopted in the present study. The cata lysts were characterized by XRD, carbon dioxide chemisorption and (57) Mossbauer spectroscopy. The hydrocarbons were formed directly from car bon dioxide over iron catalysts. The iron promoted with Cr and Mn impr oved conversion of carbon dioxide and increased the selectivity of C-2 - C-4 alkenes. Whereas, the Zn promoted iron catalyst showed unusuall y very high selectivity for C-2 - C-4 alkenes. With varying Fe:Zn rati o, the smaller ratio of Zn increased the alkene selectivity. (C) 1997 Elsevier Science Ltd.