Effect of Preparation Parameters of MCM-41 Supported Pt/Ni Catalysts and their Hydrogenation Properties

A series of Pt₅₀Ni₅₀ supported on MCM-41 catalysts were prepared via wet co-impregnation of the metal salts H₂PtCl₆ and NiSO₄·6H₂O. The metal salts were reduced using NaBH₄ and catalytic activities of the catalysts were investigated for the hydrogenation of benzene to cyclohexane. The effect of vari...

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Bibliographic Details
Published in:Catalysis letters 2009-07, Vol.130 (3-4), p.440-447
Main Authors: Abu Bakar, N. H. H, Bettahar, M. M, Abu Bakar, M, Monteverdi, S, Ismail, J
Format: Article
Language:English
Subjects:
Benzene
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Chemistry and Materials Science
Colloidal state and disperse state
Cyclohexane
Ethanol
Exact sciences and technology
General and physical chemistry
Hydrogenation
Industrial Chemistry/Chemical Engineering
Metal particles
Morphology
Organometallic Chemistry
Physical Chemistry
Porous materials
Reduction
Reduction (metal working)
Surface properties
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:A series of Pt₅₀Ni₅₀ supported on MCM-41 catalysts were prepared via wet co-impregnation of the metal salts H₂PtCl₆ and NiSO₄·6H₂O. The metal salts were reduced using NaBH₄ and catalytic activities of the catalysts were investigated for the hydrogenation of benzene to cyclohexane. The effect of various reduction conditions such as reduction temperature, NaBH₄ concentration and the medium in which reduction was carried out was investigated. Results show that optimum catalytic activity occurs when catalysts are synthesized at 273 K using 0.3 M of NaBH₄ in a medium of ethanol. The variation in reduction rate with reduction conditions influenced the metal particle morphology which effected catalytic activity. Further comparison of the reactivity of Pt₅₀Ni₅₀ with that of the respective monometallic catalysts synthesized at optimum conditions, show that the Pt₅₀Ni₅₀ exhibited superior reactivity. Surface properties of the catalysts were characterized using H₂-TPR, H₂-adsorprtion and H₂-TPD analyzes. Studies on the morphology of the metal particles and composition were obtained via TEM and SEM equipped with elemental analysis.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-009-9922-1