Preparation of Pt/alumina catalysts by the sol-gel method

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1341· OSTI ID:5224071

Balakrishnan, K; Gonzalez, R D ^[1]

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1. Tulane Univ., New Orleans, LA (United States)

Alumina-supported catalysts are widely used in the petroleum industry in reforming and hydrotreating processes. 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. The 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. 31 refs., 8 figs., 13 tabs.

• OSTI ID: 5224071
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 144:2; 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
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
ELEMENTS
HEXANE
HYDROCARBONS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POROSITY
SYNTHESIS
TRANSITION ELEMENTS