Crotonaldehyde hydrogenation on Pt/TiO{sub 2} and Ni/TiO{sub 2} SMSI catalysts
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Chemical Engineering
A kinetic and DRIFTS (diffuse reflectance FTIR) investigation of crotonaldehyde adsorption and hydrogenation was conducted over TiO{sub 2}-supported Pt and Ni with the intent of gaining insight into the adsorption modes of molecules with carbonyl groups on these catalysts in the SMSI and non-SMSI states. Significant enhancement in selectivity toward crotyl alcohol was observed with each catalyst after reduction at 773 K. DRIFT spectra under reaction conditions identified crotonaldehyde species strongly adsorbed through the C{double_bond}C bond and weakly coordinated through both the C{double_bond}C and the C{double_bond}O bonds on these catalysts after reduction at 573 K, /which gave a peak at 1693 cm{sup {minus}1}. After reduction at 773 K, an additional adsorbed species with a strong band at 1660 cm{sup {minus}1}, indicating a significant interaction between the carbonyl group and the surface, was observed, which is presumed to be stabilized at interfacial Pt-TiO{sub x} and Ni-TiO{sub x} sites. A decrease in the surface coverage of this species paralleled a drop in selectivity to crotyl alcohol with time on stream. After reduction at 573 K, decarbonylation occurred during the initial few minutes on stream to create adsorbed CO on Pt/TiO{sub 2} in addition to carbon deposition, but these reactions were significantly suppressed after reduction at 773 K, presumably due to a TiO{sub x} overlayer which covers part of the Pt surface and breaks up the ensembles of Pt atoms required for these reactions.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-84ER13276
- OSTI ID:
- 350262
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 183; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure sensitivity of the hydrogenation of crotonaldehyde over Pt/SiO{sub 2} and Pt/TiO{sub 2}
The selective hydrogenation of crotonaldehyde over bimetallic catalysts