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 Solvent Free Selective Isomerization Of P-diethylbenzene To M-diethylbenzene Using Modified Hβ Zeolites

Mahesh S. Edake and Shriniwas D. Samant

DOI: 10.5185/amlett.2014.2586

Keywords: Zeolite Hβ; diethylbenzene; isomerization; heterogeneous catalysis; cation exchange.

Abstract: 

 Solvent free and selective isomerization of p-diethylbenzene (p-DEB) to m-diethylbenzene (m-DEB) was carried out using metal modified zeolite Hβ at high temperature. The metal modification of Hβ catalyst was carried out by using typical Lewis acidic cations Al3+, Fe3+, Ti4+, Sn4+ and Sb3+. The catalysts were characterized by XRD, FE-SEM, HR-TEM, FT-IR, N2-desorpt­­ion (BET), ICP-AES, NH3-TPD, pyridine-IR, and TGA techniques for structure, morphology, acidity and stability. Particle size of the crystallites was determined by HR-TEM and the size was in the range of 15 nm - 35 nm. At 250oC, Al-Hβ, Fe-Hβ and Ti-Hβ catalysts showed 69% - 75% conversion of p-DEB with 43% - 51% selectivity towards m-DEB.  This process is a greener alternative to the classical AlCl3 process.  Further, such an isomerization would make the styrene manufacture more economic. 

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