Metal Organic Framework-Derived Iron Catalysts for the Direct Hydrogenation of CO2 to Short Chain Olefins
KAUST DepartmentChemical Engineering Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Online Publication Date2018-08-22
Print Publication Date2018-10-05
Permanent link to this recordhttp://hdl.handle.net/10754/631302
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AbstractWe report the synthesis of a highly active, selective, and stable catalyst for the hydrogenation of CO 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 C-C olefin space time yields of 33.6 mmol·gcat·h at XCO = 40%, 320 °C, 30 bar, H/CO = 3, and 24 000 mL·g·h. 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 CO hydrogenation, namely, iron oxide and iron carbides and by (ii) increasing CO and CO uptake while decreasing H affinity, interactions responsible for boosting olefin selectivity.
CitationRamirez A, Gevers L, Bavykina A, Ould-Chikh S, Gascon J (2018) Metal Organic Framework-Derived Iron Catalysts for the Direct Hydrogenation of CO2 to Short Chain Olefins. ACS Catalysis 8: 9174–9182. Available: http://dx.doi.org/10.1021/acscatal.8b02892.
PublisherAmerican Chemical Society (ACS)