Cation-exchanged montmorillonites synthesis

The synthesis of cation-exchanged montmorillonite is performed through the following reactions. 

Hence, the idea of direct use of cumene hydroperoxide as the raw material for the BPA synthesis which includes the following two steps the catalyzed cleavage of CHP and the condensation of so obtained phenol and acetone. It was found that the use of some specific combination of catalysts for the both steps provides high yields of BPA and low yields of impurities, without need for intermediate purification steps [69]. The use of an acid treated montmorillonite clay as the catalyst for the CHP cleavage, and a cross-linked cation-exchange resin with pyridyl ethyl mercaptan or... 

Materials and Synthesis. Sodium montmorillonite (Na-Mmt), Cloisite Na, was obtained fi om Southern Clay Products. The cation-exchange capacity, CEC, was 0.92 meq/g and the clay was used as received without any further drying. A commercial atactic polystyrene. 

Both Lewis and Brdnsted acid sites exist on pillared clays. The acidity depends on the exchanged cations, the preparation method and the starting clay [8], It is known that surface acidity is important for SCR reaction of NO by NH3 [4, 5, 9]. Different pillared clays were synthesized and tested for their activities in the SCR NO [10, 11]. Research on titanium pillared clays was initiated by Sterte [12], who first reported the synthesis of titanium pillared montmorillonite using TiCU solution in hydrochloric acid. Bernier et al. 

Clays [2] and zeolites [3] have been reported as good catalysts for Diels-Alder synthesis. Recently, we have studied the Diels-Alder cycloaddition between methyl acrylate (1) and cyclopentadiene (2) (Figure 1) and have shown that the solvent [4], the calcination of the solid [5] and the exchanged cation [6] play a decisive role. We now report the results obtained from the reactions of cyclopentadiene with methyl and (-)-menthyl acrylates, catalysed by K10 montmorillonites exchanged with different cations and dried at 120°C or calcined at 550°C. 

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