• Adrian Ramirez
  • Lieven Gevers
  • Anastasiya Bavykina
  • Samy Ould-Chikh
  • Jorge Gascon

We report the synthesis of a highly active, selective, and stable catalyst for the hydrogenation of CO2 to short chain olefins in one single step by using a metal organic framework as catalyst precursor. By studying the promotion of the resulting Fe(41 wt %)-carbon composites with different elements (Cu, Mo, Li, Na, K, Mg, Ca, Zn, Ni, Co, Mn, Fe, Pt, and Rh), we have found that only K is able to enhance olefin selectivity. Further catalyst optimization in terms of promoter loading results in catalysts displaying unprecedented C2-C4 olefin space time yields of 33.6 mmol·gcat-1·h-1 at XCO2 = 40%, 320 °C, 30 bar, H2/CO2 = 3, and 24 000 mL·g-1·h-1. Extensive characterization demonstrates that K promotion affects catalytic performance by (i) promoting a good balance between the different Fe active phases playing a role in CO2 hydrogenation, namely, iron oxide and iron carbides and by (ii) increasing CO2 and CO uptake while decreasing H2 affinity, interactions responsible for boosting olefin selectivity.

Original languageEnglish
Pages (from-to)9174-9182
JournalACS Catalysis
Issue number10
Publication statusPublished - 2018
Externally publishedYes

ID: 47183720