The Effects of Al2O3 Addition and WO3 Modification on Catalytic Activities of NiO/TiO2 for Acid Catalysis

NiO/Al 2 O 3 –TiO 2 /WO 3 catalysts for acid catalysis were prepared by the addition of Al 2 O 3 and the modification with WO 3 . The strong acid sites were formed through the bonding between dispersed WO 3 and TiO 2 . The larger the dispersed WO 3 amount, the higher both the acidity and catalytic a...

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Bibliographic Details
Published in:Catalysis letters 2008, Vol.120 (1-2), p.116-125
Main Authors: Sohn, Jong Rack, Lee, Sung Gyu
Format: Article
Language:English
Subjects:
Acids
Aluminum oxide
Bonding strength
Catalysis
Catalytic activity
Chemistry
Chemistry and Materials Science
Dispersion
Exact sciences and technology
General and physical chemistry
Industrial Chemistry/Chemical Engineering
Nickel oxides
Organometallic Chemistry
Physical Chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium dioxide
Tungsten oxides
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Summary:NiO/Al 2 O 3 –TiO 2 /WO 3 catalysts for acid catalysis were prepared by the addition of Al 2 O 3 and the modification with WO 3 . The strong acid sites were formed through the bonding between dispersed WO 3 and TiO 2 . The larger the dispersed WO 3 amount, the higher both the acidity and catalytic activity. The addition of Al 2 O 3 up to 5 mol% enhanced acidity and catalytic activity of NiO/Al 2 O 3 –TiO 2 /WO 3 gradually due to the interaction between Al 2 O 3 and TiO 2 and consequent formation of Al–O–Ti bond. The presence of NiO may attract reactants and enhance the local concentration of reactants near acid sites and consequently increase catalytic activity.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-007-9262-y