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Selective dehydra-decyclization of cyclic ethers to conjugated dienes over zirconia

Journal Article · · Journal of Catalysis
 [1];  [2];  [3];  [4];  [5];  [4];  [6]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States); OSTI
  2. Univ. of Delaware, Newark, DE (United States)
  3. Univ. of Massachusetts, Amherst, MA (United States)
  4. Univ. of Delaware, Newark, DE (United States); Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI)
  5. Univ. of Pennsylvania, Philadelphia, PA (United States); Univ. of Delaware, Newark, DE (United States); Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI)
  6. Univ. of Massachusetts, Amherst, MA (United States); Univ. of Delaware, Newark, DE (United States); Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI)
ZrO2 provides high selectivity (>90%) to conjugated pentadienes through the dehydra-decyclization of C-5 cyclic ethers, even at high conversions. 1,3-Pentadiene was the major product in both reaction of 2-methyltetrahydrofuran and tetrahydropyran over ZrO2. The reaction of 3-methyltetrahydrofuran produced nearly stoichiometric amounts of isoprene. Other catalysts, including TiO2, γ-Al2O3, and H-ZSM-5, were generally much less selective and produced a mixture of diene isomers. A combination of TPD and steady-state measurements revealed that both piperylenes are exclusively produced through primary catalytic pathways from 2-methyltetrahydrofuran, avoiding any isomerization once formed. First-principle calculations on ZrO2 imply the presence of an energetically favored, surface isomerization of ring-opened intermediates to conjugated alkenolates that selectively dehydrate to conjugated dienes, providing high selectivity to the desired products. Finally, the stabilization of the conjugated alkenolate is key for understanding the ability of ZrO2 to selectively produce conjugated dienes from cyclic ethers, without the need for the thermo-limited diene isomerization.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI); Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001004
OSTI ID:
1977255
Journal Information:
Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 410; ISSN 0021-9517
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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