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Influence of preparation method and boron addition on the metal function properties of RuSn catalysts for selective carbonyl hydrogenation
Author(s) -
Sánchez Maria A.,
Mazzieri Vanina A.,
Sad Mario R.,
Grau Ricardo,
Pieck Carlos L.
Publication year - 2011
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2536
Subject(s) - catalysis , chemistry , selectivity , sodium borohydride , ruthenium , fourier transform infrared spectroscopy , x ray photoelectron spectroscopy , metal , selective reduction , inorganic chemistry , boron , infrared spectroscopy , alcohol , organic chemistry , chemical engineering , engineering
BACKGROUND: Improvements in the selective hydrogenation of unsaturated fatty acid methyl esters in order to obtain unsaturated fatty alcohols have been attempted through the preparation and modification of supported group VIII metallic catalysts. Suitable catalysts appear to be those based on supported Ru modified by Sn. The influence of preparation and activation methods on the structural and electronic properties of the metallic phase and the effect of modifications to these properties on the catalytic performance of RuSn/Al 2 O 3 catalysts was studied regarding selective hydrogenation of carbonyl groups. RESULTS: Preparation methods have a marked influence on the electronic state of Ru and its interaction with Sn. Temperature‐programmed reduction (TPR), Fourier transform infrared spectroscopy of chemisorbed CO (FTIR‐CO) and X‐ray photoelectron spectroscopy (XPS) results clearly show that the incorporation of sodium borohydride in the preparation leads to a greater RuSn interaction when compared with catalysts prepared by co‐impregnation without B. The activation of catalysts without B (either by direct reduction or calcinations‐reduction) does not produce a strong RuSn interaction. B‐containing catalysts exhibit higher hydrogenolytic and lower dehydrogenating activities. Selectivity towards oleyl alcohol formation was 37% for this catalyst, while catalysts without B were not suitable for obtaining fatty alcohols. CONCLUSION: The degree of interaction between Ru and Sn strongly depends on catalyst preparation and activation method where strong interaction promotes selectivity with respect to oleyl alcohol formation. On the contrary, catalysts with a weak RuSn interaction do not show significant selectivity for the unsaturated alcohol. Copyright © 2010 Society of Chemical Industry