Preparation of Pt/Alumina Catalysts by the Sol-Gel Method

A series of alumina-supported Pt catalysts were prepared by using the sol-gel method. The effect of the variables of preparation, the nature of solvent removal and pretreatment were investigated. The total surface area, pore size distributions, Pt dispersions, and catalytic reactivity were measured...

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Bibliographic Details
Published inJournal of catalysis Vol. 144; no. 2; pp. 395 - 413
Main Authors Balakrishnan, K., Gonzalez, R.D.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 01.12.1993
Elsevier
Subjects
02 PETROLEUM
020400 - Petroleum- Processing
400201 - Chemical & Physicochemical Properties
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
Catalysis
CATALYST SUPPORTS
Catalysts: preparations and properties
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
Chemistry
ELEMENTS
Exact sciences and technology
General and physical chemistry
HEXANE
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POROSITY
SYNTHESIS
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENTS
Catalytic reaction
Deactivation
Hydrocarbon
Aliphatic compound
Saturated compound
Transition metal
Experimental study
Supported catalyst
Characterization
Heterogeneous catalysis
Platinum
Sol gel process
Preparation
Hexane
Xerogel
Alumina
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Summary:A series of alumina-supported Pt catalysts were prepared by using the sol-gel method. The effect of the variables of preparation, the nature of solvent removal and pretreatment were investigated. The total surface area, pore size distributions, Pt dispersions, and catalytic reactivity were measured for the various samples. It was determined that a stoichiometric water/aluminum alkoxide molar ratio of 3.0 gave the sample with the highest surface area. These sol-gel samples were fairly active in the reactions of n-hexane and showed desirable selectivities. Xerogel samples were found to be superior in comparison to the corresponding aerogel samples as far as total surface area and metallic dispersions were concerned. Mixing of silica to the alumina (after a prehydrolysis step) to an extent of 5 wt%, in order to form a 1.0 Pt/(95% alumina-5% silica) mixed metal oxide sample, increased the sample total surface area and metallic dispersion by a small extent, in comparison to the 1.0 Pt/alumina sample.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1993.1341