AUTHOR=da Silva Igor A. , Mota Claudio J. A. 

TITLE=Conversion of CO2 to Light Olefins Over Iron-Based Catalysts Supported on Niobium Oxide

JOURNAL=Frontiers in Energy Research

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2019.00049

DOI=10.3389/fenrg.2019.00049

ISSN=2296-598X

ABSTRACT=<p>Four iron-based catalysts supported on niobium oxide (Nb<sub>2</sub>O<sub>5</sub>) were prepared by impregnation and characterized by TPR, FRX, DRX, and textural analysis. The catalysts were tested in a fixed bed continuous flow unit to convert a mixture of CO<sub>2</sub> and H<sub>2</sub> to hydrocarbons at atmospheric pressure. All catalysts were active in the range of 623–723 K. The selectivity to hydrocarbons and light olefins increases with the use of alkali metal promoters (K or Cs). At 673 K, the Fe-Cr-K/Nb<sub>2</sub>O<sub>5</sub> showed 26% selectivity to light olefins, representing 5% yield with 20% CO<sub>2</sub> conversion. The niobium oxide-supported catalysts were more active and selective than the same catalyst formulation supported on SiO<sub>2</sub>.</p>