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ondensation reactions of propanal over Ce x Zr 1 − x O 2 mixed oxide catalysts
| Content Provider | Semantic Scholar |
|---|---|
| Author | Gangadharan, N. Shen, Min Gang Sooknoi, Tawan Resasco, Daniel E. Mallinson, Richard G. |
| Copyright Year | 2010 |
| Abstract | Vapor phase condensation reactions of propanal were investigated over CexZr1−xO2 mixed oxides as a model reaction to produce gasoline range molecules from short aldehydes found in bio-oil mixtures. Several operating parameters were investigated. These included the type of carrier gas used (H2 or He) and the incorporation of acids and water in the feed. Propanal is converted to higher carbon chain oxygenates on CexZr1−xO2 by two pathways, aldol condensation and ketonization. The major products of these condensation reactions include 3-pentanone, 2-methyl-2-pentenal, 2-methylpentanal, 3-heptanone and 4-methyl-3-heptanone. It is proposed that the primary intermediate for the ketonization path is a surface carboxylate. The presence of acids in the feed inhibits the aldol condensation pathway by competitive adsorption that reduces the aldehyde conversion. Water also promotes ketonization and inhibits aldol condensation by increasing the concentration of surface hydroxyl groups that enhance the formation of |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.ou.edu/catalysis/pubs/2010-9.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
