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Using β-MCM41 composite molecular sieves as supports of bifunctional catalysts for the hydroisomerization of n-heptane

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Abstract

β-MCM41 composite molecular sieves were hydrothermally synthesized using NaOH treated β zeolite as precursors, and Pt/β-MCM41 bifunctional catalysts were prepared by impregnation. Hβ, desilicated Hβ by NaOH treatment (Dβ), and the physical mixture of Hβ and MCM41 (β+MCM41) were also used as control supports for bifunctional catalysts. All the catalysts were characterized by ICP, XRD, BET, nitrogen adsorption–desorption isotherm and NH3-TPD, and evaluated in the hydroisomerization of n-heptane using an atmospheric fixed bed flow reactor. Dβ, β+MCM41, or β-MCM41 supported Pt catalysts showed higher selectivity to isoheptanes than the counterpart Pt/Hβ did due to the presence of mesopores in addition to the zeolite micropores. Moreover, Pt/β-MCM41 was demonstrated to be a much more selective catalyst among them because the connection between mesopores and micropores accelerated the diffusion of larger molecules of isoheptanes. Under optimal conditions, Pt/β-MCM41 provided a very high selectivity to isomerization of 96.5%, coupled with a considerable high conversion of n-heptane of 56.0%.

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Acknowledgments

The authors thank greatly the Jiangsu Provincial Key Natural Science Foundation for Universities (No. 06KJA53012), and National Natural Science Foundation of China (Nos. 20476046 and 20976084).

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Authors and Affiliations

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China

    Ping Liu, Yue Yao & Jun Wang

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  1. Ping Liu
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  2. Yue Yao
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  3. Jun Wang
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Correspondence to Jun Wang.

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Liu, P., Yao, Y. & Wang, J. Using β-MCM41 composite molecular sieves as supports of bifunctional catalysts for the hydroisomerization of n-heptane. Reac Kinet Mech Cat 101, 465–475 (2010). https://doi.org/10.1007/s11144-010-0239-2

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  • DOI: https://doi.org/10.1007/s11144-010-0239-2

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