Deep oxidation of methane on a Pt/Si3N4 catalyst

Abstract

We have studied platinum catalysts supported on silicon nitride Si ₃N₄ in the process of deep oxidation of methane. We have used transmission electron microscopy and X-ray photoelectron spectroscopy to study the surface properties of the Pt/Si₃N₄ samples before and after the catalytic reaction. We have established that the metallic platinum particles in freshly prepared systems are characterized by average sizes of 1.7-5.3 nm, while after the catalytic reaction we observe formation of Pt crystallites up to 30-70 nm in size. We hypothesize that the observed deactivation of platinum catalysts in deep oxidation of methane is connected with crystallization of the metallic particles and their entrainment with the reaction products during catalysis.

Original language	English
Pages (from-to)	241-245
Number of pages	5
Journal	Theoretical and Experimental Chemistry
Volume	40
Issue number	4
DOIs	https://doi.org/10.1023/B:THEC.0000041809.10564.dd
Publication status	Published - Jul 2004

Keywords

Deactivation
Methane oxidation
Platinum
Silicon nitride

ASJC Scopus subject areas

Chemistry(all)

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Kurzina, I. A., Cadete Santos Aires, F. J., & Bertolini, J. C. (2004). Deep oxidation of methane on a Pt/Si₃N₄ catalyst. Theoretical and Experimental Chemistry, 40(4), 241-245. https://doi.org/10.1023/B:THEC.0000041809.10564.dd

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abstract = "We have studied platinum catalysts supported on silicon nitride Si 3N4 in the process of deep oxidation of methane. We have used transmission electron microscopy and X-ray photoelectron spectroscopy to study the surface properties of the Pt/Si3N4 samples before and after the catalytic reaction. We have established that the metallic platinum particles in freshly prepared systems are characterized by average sizes of 1.7-5.3 nm, while after the catalytic reaction we observe formation of Pt crystallites up to 30-70 nm in size. We hypothesize that the observed deactivation of platinum catalysts in deep oxidation of methane is connected with crystallization of the metallic particles and their entrainment with the reaction products during catalysis.",

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AU - Kurzina, I. A.

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AU - Bertolini, J. C.

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AB - We have studied platinum catalysts supported on silicon nitride Si 3N4 in the process of deep oxidation of methane. We have used transmission electron microscopy and X-ray photoelectron spectroscopy to study the surface properties of the Pt/Si3N4 samples before and after the catalytic reaction. We have established that the metallic platinum particles in freshly prepared systems are characterized by average sizes of 1.7-5.3 nm, while after the catalytic reaction we observe formation of Pt crystallites up to 30-70 nm in size. We hypothesize that the observed deactivation of platinum catalysts in deep oxidation of methane is connected with crystallization of the metallic particles and their entrainment with the reaction products during catalysis.

KW - Deactivation

KW - Methane oxidation

KW - Platinum

KW - Silicon nitride

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