T. Borrmann et al.
catalytic conversion was carried out, and the products of The freeing of access to the rhodium had the effect of
this conversion analysed. It was found that the recycled reducing selectivity. It would be interesting to attempt
catalyst performed very comparable to the fresh catalyst optimization of the catalyst by controlled acid treatment
(
Table 3).
and to find a regime by which activity is increased while
the selectivity is not changed. Furthermore, it would be
interesting to test the rhodium containing silicates in
other catalytic applications, such as hydrogenation, and
also employ different metals.
4
. Conclusions
Nano-structured calcium silicate can be used as catalytic
support for rhodium. If rhodium is impregnated onto
the silicate, the metal is not well bound to the silicate Acknowledgements
support and can be leached into the product phase or
a solvent present. By adding rhodium trichloride to the We would like to thank Katherine Hobbes and Bryony
synthesis of the silicate a more robust catalyst has been J. James, Department of Chemical and Materials
created, which does not loose rhodium into solvents Engineering, School of Engineering, The University of
in contact with the catalyst. However, if alcohols are Auckland, Private Bag 92019, Auckland, New Zealand,
used in the making of the rhodium containing silicate, for the assistance in recording the scanning electron
the material suffers from catalyst leaching. The silicate microscope images. We also thank Professor Dr. Dr.
can be acid washed, which results in the loss of some mult h.c. Herbert W. Roesky for the free use of the
rhodium but appeared to remove blockage around the equipment necessary to carry out the hydroformylation
remaining catalytic centres to increase catalytic activity. tests.
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