Nanoscale redox catalysts: Cr- and Cr,Al-pillared layer clays: Characterization and catalytic activity

Kiricsi, Imre and Molnár, Árpád and Pálinkó, István (1997) Nanoscale redox catalysts: Cr- and Cr,Al-pillared layer clays: Characterization and catalytic activity. SOLID STATE IONICS, 101-03 (Part 2). pp. 793-797. ISSN 0167-2738

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Abstract

Via the co-hydrolysis of CrCl3 and AlCl3 in the presence of swollen Na-montmorillonite, pillared layer clays were prepared. The location of chromium in the pillars and in the primary pillaring agent, the Al-13-Keggin ion, was investigated by various methods (mid and far IR and Al-27 NMR spectroscopies). We found that isomorphous substitution of chromium for aluminium did not occur, rather co-hydrolysis and co-pillaring took place. Upon heat treatment the loss of outer-sphere water and dehydroxylation at higher temperatures resulted in the formation of bulky alumina pillars decorated with chromia species, The resulting material was used in the oxidation of 1-phenyl-1-propanol in the presence of tert-butylhydroperoxide as co-oxidant.

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