Formation of small Pt-Ir bimetallic clusters in NaY zeolite probed with sup 129 Xe NMR spectroscopy and ethane hydrogenolysis

Journal Article · Thu Oct 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90163-C· OSTI ID:6999067

Yang, O B; Woo, S I ^[1]; Ryoo, R ^[2]

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1. Korea Advanced Inst. of Science and Technology, Seoul (Korea)
2. Korea Advanced Inst. of Science and Technology, Taejon (Korea)

Very small (about 1 nm) and homogeneous Pt-Ir bimetallic clusters were formed in the zeolite supercage by calcining NaY co-ion-exchanged with Pt(NH{sub 3}){sub 4}{sup 2+} and Ir(NH{sub 3}){sub 5}Cl{sup 2+} at room temperature and subsequent reduction treatment with H{sub 2} at 5,733 K. These bimetallic clusters were characterized by hydrogen and xenon adsorption, X-ray diffraction (XRD), {sup 129}Xe NMR spectroscopy, and ethane hydrogenolysis reaction. Pt-Ir bimetallic clusters showed specific characteristics different from those of Pt and It monometallic clusters and physical mixtures of corresponding monometallic clusters. The chemical shifts of Pt-Ir bimetallic clusters in {sup 129}Xe NMR and their catalytic activities in ethane hydrogenolysis were lower than those of the corresponding physical mixtures of Pt and Ir monometallic clusters. The activation energies of Pt-Ir bimetallic clusters in ethane hydrogenolysis were smaller than those of monometallic Pt and Ir clusters. The turnover frequencies (TOFs) of bimetallic clusters in ethane hydrogenolysis are widely different from those of monometallic clusters.

• OSTI ID: 6999067
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 137:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
ALKANES
ALLOYS
BIMETALS
CALCINATION
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL SHIFT
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DAYS LIVING RADIOISOTOPES
DECOMPOSITION
DEHYDROGENATION
DIFFRACTION
DISPERSIONS
ELEMENTS
ENERGY
ETHANE
EVALUATION
EVEN-ODD NUCLEI
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
INDUSTRIAL PLANTS
INORGANIC ION EXCHANGERS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ION EXCHANGE
ION EXCHANGE MATERIALS
IRIDIUM ALLOYS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNETIC RESONANCE
MATERIALS
MINERALS
MIXTURES
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC COMPOUNDS
PARTICLE SIZE
PETROLEUM REFINERIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
PYROLYSIS
RADIOISOTOPES
RARE GASES
REDUCTION
RESONANCE
SCATTERING
SILICATE MINERALS
SIZE
SOLID CLUSTERS
SORPTION
STABLE ISOTOPES
SYNTHESIS
THERMOCHEMICAL PROCESSES
X-RAY DIFFRACTION
XENON
XENON 129
XENON ISOTOPES
ZEOLITES