Sintering of platinum-black in hydrogen: Morphology and catalytic activity

Zoltán Paál, Helga Zimmer, John R. Günter, Robert Schlögl, Martin Muhler

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Pt-black (Pt-473 and Pt-633) reduced in aqueous solution with HCHO was sintered at 473 and 633 K in hydrogen. Electron micrographs show a considerable sintering, especially at 633 K. High-resolution EM indicates the presence of agglomerates of rounded crystals; lattice fringes are also seen. Samples sintered at different temperatures show identical catalytic activity in ring opening and aromatization of alkylcyclopentanes; their activity was also similar in bond-shift isomerization of heptane isomers. On the other hand, aromatization, hydrogenolysis, and C5-cyclic isomerization were more rapid on Pt-473, while C5-cyclization was more rapid on Pt-633. These effects are discussed in terms of various active sites for these skeletal reactions and their abundance on two samples which have different morphology, hence different hydrogen retention ability; also the chemical state of their carbon impurity may be different.

Original languageEnglish
Pages (from-to)146-160
Number of pages15
JournalJournal of Catalysis
Volume119
Issue number1
DOIs
Publication statusPublished - Sep 1989

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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