LIQUID-PHASE FRIEDEL-CRAFTS ALKYLATION USING CUCR2-XFEXO4 SPINEL CATALYSTS

Iron oxide (Fe2O3) offers Lewis acidic sites for alkylation but gives low yield and cannot be reused. Therefore, spinels belonging to system CuCr2-xFexO4 were prepared by isomorphic substitution of octahedral c hromium by iron in the spinel lattice. These were found to have better catalytic activity for the liquid phase alkylation of benzene with be nzyl chloride giving diphenylmethane. CuFe2O4 gives the highest yield. The Lewis acidity of the catalysts is mainly responsible for the good catalyst performance. The ease of electron movement appears to improv e the yields. The propel ties of these catalysts were characterized by using DRIFT spectroscopy. The effects of various parameters on the ca talytic reaction have been investigated. (C) 1998 Elsevier Science B.V .