Probing metal cluster formation in NaY zeolite by /sup 129/Xe NMR

Journal Article · Wed Jun 22 00:00:00 EDT 1988 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00221a086· OSTI ID:5993246

Chmelka, B F; Ryoo, R; Liu, S B; de Menorval, L C; Radke, C J; Petersen, E E; Pines, A

The performance of zeolite-supported metal catalysts is known to depend upon preparatory treatments. Homogeneous and reproducible metal dispersion can be achieved only through careful control of calcination and reduction conditions, since migration and agglomeration of cluster precursors can occur with subsequent loss of catalytic activity. In spite of considerable research, the transformations undergone by metal guest species during calcination and reduction have not been established, primarily due to difficulties in characterizing chemical intermediates which exist as cluster precursors. By using the /sup 129/Xe NMR spectroscopy technique pioneered by Fraissard and co-workers and applied to recent advantage by the authors and others, they gain insight into the detailed chemistry of metal-zeolite catalyst preparation. They report for the first time changes in the chemical environment of NaY-supported platinum guest species by monitoring shifts in the /sup 129/Xe resonance signal induced by different chemical and thermal treatments.

• Research Organization: Univ. of California, Berkeley (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5993246
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:13; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DATA
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
INORGANIC ION EXCHANGERS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ION EXCHANGE MATERIALS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
PLATINUM
PLATINUM METALS
RADIOISOTOPES
REACTION INTERMEDIATES
RESONANCE
SODIUM COMPOUNDS
SPECTRA
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
XENON 129
XENON ISOTOPES
YTTRIUM COMPOUNDS
ZEOLITES