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Cascade Reaction of Ethanol to Butadiene over Multifunctional Silica-Supported Ag and ZrO2 Catalysts

Journal Article · · ACS Sustainable Chemistry & Engineering
 [1];  [2];  [2]
  1. Univ. of Virginia, Charlottesville, VA (United States); University of Virginia
  2. Univ. of Virginia, Charlottesville, VA (United States)
Although butadiene is currently a by-product of naphtha cracking, interest in producing butadiene from bio-based ethanol has increased because of the lower environmental impact of the ethanol to butadiene reaction. Furthermore, this work explores a multifunctional catalyst system composed of silica-supported Ag and ZrO2 used for the cascade reaction of ethanol to butadiene at 573 K. The Ag and ZrO2 components were synthesized on separate support particles enabling characterization of each component without interference from the other. High selectivity to butadiene (65%) at high ethanol conversion (75%) was achieved with an appropriate ratio of Ag and ZrO2 in the reactor. Silver catalyzed the initial dehydrogenation of ethanol to acetaldehyde while ZrO2 catalyzed the C-C coupling and subsequent dehydration reactions. The silica-supported ZrO2 exhibited superior selectivity relative to bulk ZrO2 in the Ag-promoted ethanol to butadiene reaction. Results from Zr K-edge X-ray absorption spectroscopy and UV-Vis spectroscopy showed that ZrO2 was highly dispersed on the silica support over a range of loadings. Infrared spectroscopy of adsorbed pyridine, CO, and CO2, and kinetics of probe reactions 1-butene double bond isomerization, 2-propanol decomposition, and ethanol hydrogenation of acetone were used to compare the acid-base nature and chemical reactivity of silica-supported ZrO2 to bulk ZrO2.
Research Organization:
Univ. of Virginia, Charlottesville, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-95ER14549; SC0012704
OSTI ID:
1865052
Alternate ID(s):
OSTI ID: 1903144
Journal Information:
ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 2 Vol. 10; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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