Silica Based Catalyst Supports Are Inert, Aren’t They? – Striking Differences in Ethanol Decomposition Reaction Originated from Macro- & Surface Fine Structure Evidenced by Small Angle X-ray Scattering

Sápi, András and Dobó, Dorina G. and Sebők, Dániel and Halasi, Gyula and Juhász, Koppány L. and Szamosvölgyi, Ákos and Pusztai, Péter and Varga, Erika and Kálomista, Ildikó and Galbács, Gábor and Kukovecz, Ákos and Kónya, Zoltán (2017) Silica Based Catalyst Supports Are Inert, Aren’t They? – Striking Differences in Ethanol Decomposition Reaction Originated from Macro- & Surface Fine Structure Evidenced by Small Angle X-ray Scattering. ACS CATALYSIS, 121 (9). pp. 5130-5136. ISSN 2155-5435

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Abstract

1.8 nm Pt nanoparticles with narrow size distribution were anchored on mostly identical, amorphous silica supports (SBA-15, MCF-17, Silica Foam) and were tested in ethanol decomposition reactions at < 300 °C. The reaction on the Pt/SF (0.117 molecules·site-1·s-1) was ~2 times faster compared to Pt/MCF-17 (0.055 molecules·site-1·s-1) and Pt/SBA-15 (0.063 molecules ·site-1·s-1) at 300 °C. In the case of Pt/SBA-15, selectivity towards acetaldehyde was ~4 times higher compared to the Pt/MCF-17 and Pt/SF catalysts. In the case of Pt/MCF-17 and Pt/SF, the methane to acetaldehyde ratio was 0.27 and 0.24, respectively, while it was ~ 10 times higher for Pt/SBA-15 catalyst. The ethene selectivity was ~2 times higher in the case of Pt/MCF- 17 and Pt/SF compared to Pt/SBA-15. Pt/MCF-17 and Pt/SBA-15 produces ~ 50% more hydrogen compared to Pt/SF catalyst. Beside investigation of the sample with regular characterization methods, Small Angle X-ray Scattering (SAXS) studies showed striking differences in the nature of the surface of the different silica supports, which can be responsible for the activation, and selectivity deviation in ethanol decomposition reactions.

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