Synthesis and Characterization of Pt-Ru-Sn Catalysts

<p>Magnesia-supported trimetallic Pt-Ru-Sn catalysts prepared through a cluster and a conventional synthetic route have been investigated in terms of their structural properties and their catalytic activity for the hydrogenation of citral and crotonaldehyde. FTIR results indicate that the majority of the stabilizing ligands remain attached to the PtRu₅(μ-SnPh₂)(C)(CO)₁₅ cluster used following impregnation onto the MgO support. Under H₂ reduction conditions, partial and full ligand removal are both observed at 473 and 573 K, respectively. HRSTEM analysis shows that cluster-derived samples exhibit significantly smaller average metal particle sizes, as well as narrower particle size distributions than the corresponding conventionally prepared ones. EDX measurements show that in the cluster-derived catalysts, the majority of the metal particles present are trimetallic in nature, with metal compositions similar to those of the original cluster. In contrast, the conventionally prepared materials contain mostly bimetallic and monometallic particles with variable compositions. XPS was used to determine how the variation in method of Sn addition to bimetallic Pt-Ru affects the electronic state for the trimetallic Pt-Ru-Sn/MgO system prepared by impregnation using multimetallic clusters, metal-salts, and the combination of both precursor types. Results show that the PtRu₅Sn/MgO material has a significantly higher percentage of Sn0 in comparison to Pt-Ru-Sn/MgO and PtRu₅-Sn/MgO, and a corresponding shift in both Pt and Ru peaks can be correlated to this relative change in Sn oxidation state. The formation of smaller metal particles and</p>

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Campus Access Dissertation

Discipline thesis:degree_discipline

Chemical Engineering

Year

2012

Author dc:creator

• Uffalussy, Karen Jeaneen

Contributors dc:contributor

• Michael D Amiridis

• Chemical Engineering
• Engineering
• bimetallic
• catalysis
• citral
• crotonaldehyde
• trimetallic
• XPS

Statement dc:rights

• © 2012, Karen Jeaneen Uffalussy

Repository record dc:identifier

https://scholarcommons.sc.edu/etd/600

OAI identifier oai:identifier

oai:scholarcommons.sc.edu:etd-1601