Higher Alcohols Synthesis from CO<sub>2</sub> Hydrogenation over K<sub>2</sub>O-Modified CuZnFeZrO<sub>2</sub> Catalysts

Abstract

The CuZnFeZrO 2 catalysts were synthesized by co-precipitation method.,and then used to synthesize different content of K 2 O modified CuZnFeZrO 2 catalysts by deposition-precipitation method.Hydrogenation of CO 2 to higher alcohols over (K 2 O) x /CuZnFeZrO 2 catalysts were investigated at 523 K,3.0 MPa and 3000 h -1 .These catalysts were characterized by X-ray diffraction (XRD),temperature programmed reduction of H 2 (H 2 -TPR),and temperature-programmed desorption of CO 2 (CO 2 -TPD).The results showed the addition of an appropriate amount of Potassium to the CuZnZrO 2 catalysts improved catalytic activity ,the space time yield (STY) and C 2+ OH selectivity. When the Fe content is 5% best, at this time the space time yield of selectivity and alcohol of C 2+ alcohol reaches the maximum value, this time space and time conversion rate is 0.32g/ml·h.