Key reaction for formation of isobutene over ZrO{sub 2} and isoprene over CeO{sub 2} in CO hydrogenation
Conference
·
OSTI ID:468045
- Tokyo Inst. of Technology, Yokohama (Japan)
- Advance Polytechnic Center, Chiba (Japan)
CO hydrogenation over ZrO{sub 2} at 623 and 673 K selectively forms isobutene. {sup 13}C tracer experiment with {sup 13}CO showed that carbon of surface methoxide species is incorporated in central carbon of isobutene. CeO{sub 2} forms 2-methylpropanal and diisopropyl ketone at 523 K and isobutene and isoprene with high selectivities in C{sub 4} and C{sub 5} hydrocarbons, respectively, at 673 K. Addition of H{sub 2}O to a mixture of CO H{sub 2} at 583 and 653 K led to formation of ketones and secondary alcohol`s. These suggest that there is acyl species as a common intermediate, which converts to isobutene via aldol-condensation with formaldehyde and to isoprene via acetone formed from its reaction with H{sub 2}O or bulk oxygen followed by ketonization reaction.
- OSTI ID:
- 468045
- Report Number(s):
- CONF-960652--
- Country of Publication:
- United States
- Language:
- English
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