Selective ion-exchange in MAPO-36 and its application in toluene disproportionation |
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Authors: | S Vishnu Priya J Herbert Mabel S Gopalakrishnan M Palanichamy V Murugesan |
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Affiliation: | (1) Department of Chemistry, Anna University, Chennai, 600 025, India |
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Abstract: | MAPO-36 was synthesized hydrothermally by isomorphic substitution of Mg2+ in the framework of AlPO-36 and ion-exchanged with Fe3+, Zn2+, La3+ and Ce3+ by wet method. The materials were characterized by XRD, TGA, TPD (ammonia) and SEM-EDX. XRD revealed absence of structural
degradation after ion-exchange. TPD (ammonia) showed selective ion-exchange of strong acid sites in ion-exchanged MAPO-36.
The weight loss around 550 °C in TGA for Fe, La and CeMAPO-36 suggested conversion of M(OH)2+ to MO+. Toluene disproportionation was carried over all catalysts in which diphenyl methane derivative was suggested to be the principle
intermediate in the formation of p-xylene and other products. The time on stream study showed exclusive formation of p-xylene after 6 h. |
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Keywords: | MAPO-36 MO+ Acidity Toluene disproportionation p-Xylene |
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