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    STUDIA CHEMIA - Issue no. 1-2 / 2001  
         
  Article:   ALKYLATION OF TOLUENE WITH METHANOL OVER MCM-22 AND MCM-36.

Authors:  E. DUMITRIU, IOANA FECHETE, P. CAULLET, H. KESSLER, V. HULEA, X. BOURDON. 		 
       
         
  Abstract:  MCM-36 materials were prepared by swelling the layered MCM-22 precursors with large organic molecules and then pillaring the resulting material with polymeric silica. The BET surface area of MCM-36 was 2.5 to 3 times higher than that of MCM-22. The catalytic activity and selectivity of both MCM-36 and MCM-22 were investigated in the gas-phase alkylation of toluene with methanol at reaction temperatures ranging from 498 to 673K. The methylation of toluene produces a mixture of xylenes as main products. The influence of reaction temperature, pulse number, and toluene/ methanol ratio upon the conversion of toluene and selectivities of the products were investigated. The superior catalytic performance of MCM-36 compared with MCM-22 for this reaction indicates that the open mesoporous structure can be successfully utilized to make acid sites of the layers accessible to large molecules.  
         
     
         
         
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