Hits:

Indexed by:期刊论文

Date of Publication:2017-10-01

Journal:JOURNAL OF CO2 UTILIZATION

Included Journals:Scopus、SCIE、EI

Volume:21

Page Number:100-107

ISSN No.:2212-9820

Key Words:Pyrolysis of MOFs; Hydrogenation of CO2; Carbon supported catalysts; Valuable hydrocarbons; Phase transformation

Abstract:Fe-based catalysts were acquired by one-step Fe-MIL-88B pyrolyzation and it showed high catalytic performance on hydrogenated conversion of carbon dioxide to valuable hydrocarbons. The iron compositions and catalytic performance of the catalysts were determined by pyrolysis temperatures according to XRD, SEM, TEM, N(2-)physisorption, Raman and evaluation results. Magnetite was obtained at 773 K while metallic iron was the main phase when the pyrolysis temperature increased to 973 K. Different catalytic performances over these catalysts were attributed to the transformation of iron species under the reaction conditions. Olefin-to-paraffin ratio (O/P) over pyrolyzed and K-doped catalysts was 1.3 and 5.5, respectively, and the two samples exhibited CO2 conversion with 46.0% and 43.1%, respectively. Higher catalytic performance was achieved when certain amount of Fe3O4 and chi-Fe5C2 existed in catalysts whereas metallic iron and/or theta-Fe3C had detrimental effects on lower conversion of CO2 and selectivity of valuable hydrocarbons.