Abstract
Catalytic performance of Pt impregnated parent and desilicated nano-crystalline zeolites, ZSM-5 and Beta for n-hexane isomerization was studied. Difference in channel systems of the zeolites and absence/presence of mesopores therein were found to be reflected in product distributions. ZSM-5 was desilicated by NaOH and zeolite Beta with tetramethylammonium hydroxide (TMAOH.) Desilication was found to afford comparable catalytic performance to that of the parent counterpart at reaction temperature lower by 25 °C. Observed product distributions could be substantiated with characterizations such as ammonia TPD, surface area determination and SEM. Desilicated zeolite Beta was seen to be less prone to coking as deduced from the TGA study. Location of Pt with reference to proton sites within the channels and that inside the pores viz a viz external surface also have been discussed briefly.
Graphical Abstract
Pt impregnated Zeolite Beta desilicated by TMAOH affords comparable isomer yields at temperature lower by 25 C to that by the parent zeolite. The modification also led to improved catalyst life.
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Acknowledgments
Bharat Modhera acknowledges Council of Scientific and Industrial Research (CSIR), New Delhi, India, for the award of a Senior Research Fellowship. Parimal Parikh thanks German Academic Exchange Service with whose financial support part of the present work was carried out. Authors thank Dr. Ajithkumar and Dr. Rajamohanan of National Chemical Laboratory, Pune for kindly getting us the NMR spectrum done.
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Modhera, B.K., Chakraborty, M., Bajaj, H.C. et al. Influences of Mesoporosity Generation in ZSM-5 and Zeolite Beta on Catalytic Performance During n-Hexane Isomerization. Catal Lett 141, 1182–1190 (2011). https://doi.org/10.1007/s10562-011-0610-6
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DOI: https://doi.org/10.1007/s10562-011-0610-6