Pt-KL zeolite catalysts of different preparation. Part I. Catalyst characterization

I. Manninger, Z. Paál, B. Tesche, U. Klengler, J. Halász, I. Kiricsi

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0.8% Pt on KL zeolite was prepared by reduction with H2 and NaBH4. Transmission electron microscopy and X-ray diffraction were used for characterization of morphology of the metal particles; acidity of the zeolite framework was measured with IR spectra of adsorbed pyridine. Reduction by NaBHP4 produced rather large, needle-like Pt crystallites on the outer surface of zeolite grains which contained very little acidity. Subsequent hydrogen treatment brought about their severe sintering; at the same time, small crystallites appeared. A bimodal distribution was seen when the catalyst was reduced with hydrogen; this sample exhibited appreciable acidity. X-ray diffraction data showed the presence of Pt particles above noise level in the case of borohydride-reduced catalyst only, in agreement with EM data.

Original languageEnglish
Pages (from-to)361-372
Number of pages12
JournalJournal of molecular catalysis
Issue number3
Publication statusPublished - Feb 1 1991


ASJC Scopus subject areas

  • Engineering(all)

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