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    • Alkali/alkaline earth ion-exchanged and palladium dispersed MCM- 22 zeolite as a potential catalyst for eugenol isomerization and Heck coupling reactions

      P SAHU T V HARIPRIYA A SREENAVYA G V SHANBHAG A AUGUSTIN A SAKTHIVEL

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      Alkali and alkaline earth metal ions (Na+, K+, Cs+, Mg2+) exchanged MCM-22 zeolites were prepared and subsequently palladium (2 wt.%; Pd) was dispersed on above exchanged MCM-22 zeolitematerials. All the MCM-22 materials were systematically characterized by FTIR, powder X-ray diffraction, N2 sorption analysis and temperature-programmed desorption (TPD) of CO2. The XRD pattern and FTIR data confirmed the existence of theMCM-22 framework structure even after exchanging bulkymetal ions and palladiumloading.TPDstudies using CO2 supports that the cesium and magnesium incorporated MCM-22 possess a strong and large number of basic sites. The alkali and alkaline-earth metal ions exchanged MCM-22 catalysts were explored forindustrially important eugenol isomerisation, whereas the palladium containingMCM-22 materials were utilised forHeck coupling reaction of styrene with iodobenzene. The Cs-MCM-22 showed the best activity for the eugenolisomerization with the isoeugenol yield of 76%. The Cs/Pd-MCM-22 was shown as promising heterogeneous catalyst forHeck coupling reaction of styrene with iodobenzene and yield 99%stilbene. For both isomerization and Heck coupling reaction, the catalysts retain their activities even after several runs

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