title: Design of a metal-promoted oxide catalyst for the selective synthesis of butadiene from ethanol.
abstract: The synthesis of buta-1,3-diene from ethanol has been studied over metal-containing (M=Ag, Cu, Ni) oxide catalysts (MO(x)=MgO, ZrO2, Nb2O5, TiO2, Al2O3) supported on silica. Kinetic study of a wide range of ethanol conversions (2-90%) allowed the main reaction pathways leading to butadiene and byproducts to be determined. The key reaction steps of butadiene synthesis were found to involve ethanol dehydrogenation, acetaldehyde condensation, and the reduction of crotonaldehyde with ethanol into crotyl alcohol. Catalyst design included the selection of active components for each key reaction step and merging of these components into multifunctional catalysts and adjusting the catalyst functions to achieve the highest selectivity. The best catalytic performance was achieved over the Ag/ZrO2/SiO2 catalyst, which showed the highest selectivity towards butadiene (74 mol%).
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University, Leninskye Gory 1, bld. 3, 119991 Moscow (Russia), Fax: (+7) 4959393570; "UNISIT" LLC, Leninskye Gory 1, bld. 75 V, 119991 Moscow (Russia).
authors.forename: Vitaly L
authors.initials: VL
authors.lastname: Sushkevich
authors.forename: Irina I
authors.initials: II
authors.lastname: Ivanova
authors.forename: Vitaly V
authors.initials: VV
authors.lastname: Ordomsky
authors.forename: Esben
authors.initials: E
authors.lastname: Taarning
mesh_terms: D002070:Butadienes / Q000138:chemical synthesis*; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D015195:Drug Design; D000431:Ethanol / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013696:Temperature
chemical_list: D002070:Butadienes; D019216:Metals, Heavy; D010087:Oxides; D000431:Ethanol; C031763:1,3-butadiene
keywords: domino reactions; kinetics; metal promoters; oxide catalysts; reaction mechanisms