An Innovative Approach for Highly Selective Direct Conversion of CO2 into Propanol using C2H4 and H2. Issue 9 (10th July 2014)

• Record Type: Journal Article
• Authors: Ahlers, Stefan J.; Bentrup, Ursula; Linke, David; Kondratenko, Evgenii V.
• Is Part Of: ChemSusChem. Volume 7:Issue 9(2014:Sep.)
• Page Start: 2631
• Page End: 2639
• Publication Date: 2014-07-10
• Subjects: Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201402212
• Languages: English
• ISSNs: 1864-5631

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Multifunctional catalysts are developed for converting CO₂ with C₂H₄ and H₂ into propanol. Au nanoparticles (NP) supported on TiO₂ are found to facilitate this reaction. The activity and selectivity strongly depend on NP size, which can be tuned by the method of Au deposition and by promoting with K. The promoter improves the selectivity to propanol. Under optimized reaction conditions (2 MPa, 473 K, and CO₂/H₂/C₂H₄=1:1:1), CO₂ is continuously converted into propanol with a near‐to‐100 % selectivity. Catalytic tests as well as mechanistic studies by in situ FTIR and temporal analysis of products with isotopic tracers allow the overall reaction scheme to be determined. Propanol is formed through a sequence of reactions starting with reverse water–gas shift to reduce CO₂ to CO, which is further consumed in the hydroformylation of ethylene to propanal. The latter is finally hydrogenated to propanol, while propanol hydrogenation to propane is suppressed.</p> </abstract>