A study of the Ni-Sb interaction in a rare-earth Y-zeolite

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90056-N· OSTI ID:7017180

Goldwasser, M R; Rojas, D; Goldwasser, J ^[1]

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1. Univ. Central de Venezuela, Caracas (Venezuela)

Two series of catalysts were prepared by impregnating nickel and nickel-antimony over a rare-earth exchanged Y-zeolite. The nickel loadings for the monometallic catalysts were within 0.00-1.00% in weight; for the bimetallic systems the Ni loadings were in the 0.10-0.99% range while the Sb loadings were within 0.042-0.84% in weight. The effect of Sb addition on the structure and chemisorptive properties of Ni was examined using reduction studies, CO and H[sub 2] chemisorption, IR spectroscopy, and cracking of isooctane. Complete reduction to metallic nickel and metallic antimony was found for Ni- and Sb-rich catalysts. The addition of Sb dramatically decreased the chemisorption of H[sub 2] and CO. Infrared results suggest the formation of a single species, probably a Ni(CO)[sub x] species, for high-loading (> 0.3%) nickel catalysts (even after desorption of the gaseous CO at room temperature). For the Ni-Sb catalysts the bands were much weaker (in the presence of gaseous CO) and practically disappeared after the evacuation procedure. The cracking of isooctane showed a considerable increase in the formation of coke and hydrogen with increasing Ni loadings. The presence of antimony restored the amounts of coke and hydrogen to the original values present in the unsupported zeolite. Site blockage of Ni by Sb and weakening of the Ni-C bond by the addition of Sb are suggested to explain the results.

• OSTI ID: 7017180
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:2; ISSN 0021-9517; ISSN JCTLA5
• 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
ABSORPTION SPECTROSCOPY
ALKANES
ANTIMONY
BIMETALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COKE
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DEPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGEN
INFRARED RADIATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MICROSTRUCTURE
MINERALS
NICKEL
NONMETALS
OCTANE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PROCESSING
PYROLYSIS
QUANTITY RATIO
RADIATIONS
REACTION KINETICS
REDUCTION
REFINING
SEPARATION PROCESSES
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
ZEOLITES