(771d) Development of Continuous Co-Electroless Deposition and Improvements Made to Catalyst Activity and Stability
- Conference: AIChE Annual Meeting
- Year: 2019
- Proceeding: 2019 AIChE Annual Meeting
- Group: Catalysis and Reaction Engineering Division
- Session:
- Time: Friday, November 15, 2019 - 1:24pm-1:42pm
This method was used to synthesize two classes of catalysts to demonstrate improved activity and increased catalyst stability. Methanol electrooxidation catalysts for DMFCs were synthesized by depositing Cu2+/Pt4+, Ni2+/Pt4+, and Co2+/Pt4+ onto Pd/C cores. By controlling ratio of M:Pt (where M is a non-Pt transition metal), maxima in activities were shown. All elemental compositions had Pt mass activity maxima over that of supported Pt/C alone. Additionally, shell compositions showing the highest activities matched those predicted by computational modeling of this reaction reported previously in the literature.[3][4] The second class of catalysts were Ir@Pt-Ir /h-BN for a high temperature (800°C) decomposition reaction. The sintering behavior of Pt is widely reported and is made worse by weak interaction between Pt and support (as in the case with h-BN, a support lacking oxide species).[5] Catalysts prepared by IWI tested under these conditions show rapid deactivation by means of Pt particle growth. However, catalysts made by the co-deposition of Pt and Ir together resisted Pt particle growth, evidenced by in situ XRD analysis under relevant high temperature, oxidizing conditions. This demonstrates a large improvement in catalyst stability (lifetime) over monometallic Pt and bimetallic Pt-Ir catalysts made by other methods.
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