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- Title
Ethanol Coupling Reactions over MgO–Al 2 O 3 Mixed Oxide-Based Catalysts for Producing Biofuel Additives.
- Authors
Vikár, Anna; Lónyi, Ferenc; Makoye, Amosi; Nagy, Tibor; Novodárszki, Gyula; Barthos, Róbert; Szabó, Blanka; Valyon, József; Mihályi, Magdolna R.; Deka, Dhanapati; Solt, Hanna E.
- Abstract
Catalytic conversion of ethanol to 1-butanol was studied over MgO–Al2O3 mixed oxide-based catalysts. Relationships between acid-base and catalytic properties and the effect of active metal on the hydrogen transfer reaction steps were investigated. The acid-base properties were studied by temperature-programmed desorption of CO2 and NH3 and by the FT-IR spectroscopic examination of adsorbed pyridine. Dispersion of the metal promoter (Pd, Pt, Ru, Ni) was determined by CO pulse chemisorption. The ethanol coupling reaction was studied using a flow-through microreactor system, He or H2 carrier gas, WHSV = 1 g E t O H · g c a t. − 1 · h − 1 , at 21 bar, and 200–350 °C. Formation and transformation of surface species under catalytic conditions were studied by DRIFT spectroscopy. The highest butanol selectivity and yield was observed when the MgO–Al2O3 catalyst contained a relatively high amount of strong-base and medium-strong Lewis acid sites. The presence of metal improved the activity both in He and H2; however, the butanol selectivity significantly decreased at temperatures ≥ 300 °C due to acceleration of undesired side reactions. DRIFT spectroscopic results showed that the active metal promoted H-transfer from H2 over the narrow temperature range of 200–250 °C, where the equilibrium allowed significant concentrations of both dehydrogenated and hydrogenated products.
- Subjects
ETHANOL; BUTANOL; HYDROGEN transfer reactions; BIOMASS energy; CATALYSIS; CATALYSTS; CARRIER gas
- Publication
Molecules, 2023, Vol 28, Issue 9, p3788
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules28093788