Effect of K on the deactivation of model Pt black catalysts: electron 
spectroscopy and hexane test reaction

Wootsch, Attila; Wild, Ute; Schlögl, Robert; Paál, Zoltan

doi:10.1016/j.catcom.2004.05.007

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Effect of K on the deactivation of model Pt black catalysts: electron spectroscopy and hexane test reaction

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Wild, Ute
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl, Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Wootsch, A., Wild, U., Schlögl, R., & Paál, Z. (2004). Effect of K on the deactivation of model Pt black catalysts: electron spectroscopy and hexane test reaction. Catalysis Communications, 5(8), 419-423. doi:10.1016/j.catcom.2004.05.007.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0E68-9

Abstract

Pt black prepared by reduction with HCHO/KOH contains ca. 2% K impurity (Pt/K). It can be removed by washing it with HNO3 (Pt). Transformation of hexane/H2 was studied on these two samples after regeneration (O2/H2) and after exposure to trans–trans-hexa-2,4-diene at 603 K. XPS showed 47% C after this treatment on both samples, but with different carbon structure: more “graphite-like” entities on Pt, and an excess of “atomic” surface C (“C1”) on Pt/K. The loss of activity and changes in selectivity – related to the regenerated state – were less pronounced on Pt/K. The presence of K on Pt: (i) stabilizes chemisorbed hydrogen, (ii) hinders accumulation of “massive” hydrocarbonaceous deposits, (iii) and promotes their removal during regeneration.