Crystals in crystals: Nanocrystals within mesoporous zeolite single crystals

Claus H. Christensen, I. Schmidt, A. Carlsson, K. Johannsen, K. Herbst

Research output: Contribution to journalJournal articleResearchpeer-review


A major factor governing the performance of catalytically active particles supported on a zeolite carrier is the degree of dispersion. It is shown that the introduction of noncrystallographic mesopores into zeolite single crystals (silicalite-1, ZSM-5) may increase the degree of particle dispersion. As representative examples, a metal (Pt), an alloy (PtSn), and a metal carbide (beta-Mo2C) were supported on conventional and mesoporous zeolite carriers, respectively, and the degree of particle dispersion was compared by TEM imaging. On conventional zeolites, the supported material aggregated on the outer surface of the zeolite particles, particularly after thermal treatment. When using mesoporous zeolites, the particles were evenly distributed throughout the mesopore system of the zeolitic support, even after calcination, leading to nanocrystals within mesoporous zeolite single crystals.
Original languageEnglish
JournalJournal of the American Chemical Society
Issue number22
Pages (from-to)8098-8102
Publication statusPublished - 2005


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