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Catalytic cracking of n-dodecane over hierarchical HZSM-5 zeolites synthesized by double-template method

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Abstract

Hierarchical HZSM-5 zeolites have been prepared by a double-template method with tetrapropylammonium hydroxide and polydiallydimethylammonium chloride (PDDA) as micro- and meso-scale template, respectively, and Al(NO3)3 as aluminum source. The as-prepared zeolites were characterized by XRD, SEM, TEM, N2-adsorption–desorption, TGA, ICP, in situ FT-IR and NH3-TPD. The hierarchical HZSM-5 zeolite prepared at the PDDA/TEOS weight ratio of 0.2 in the synthesis gel (HZ-0.2P) had uniform mesopores (11–13 nm) and high acid site accessibility. An increase of the PDDA/TEOS resulted in enlargement of mesopore size and broadening of size distribution, together with appearance of some non-uniform accumulation pores. Moreover, the accessibility of acid sites in hierarchical HZSM-5 decreased. Catalytic cracking of n-dodecane carried out at 500 °C and 4 MPa in a wall-coated tubular reactor with HZSM-5 zeolites showed that HZ-0.2P exhibited the superior catalytic activity and stability, with the increase higher than 20% in the conversion of n-dodecane and reduction to ca. 1/2 in the deactivation rate compared with micro-porous HZSM-5 zeolite. This could be ascribed to its highest acid site accessibility, which improves the diffusion of n-dodecane and its cracking product molecules inside pore channels of catalyst.

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Acknowledgements

The authors gratefully acknowledge financial support from National Natural Science Foundation of China (Grant No. 21522605).

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Correspondence to Li Wang.

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Liu, H., Diao, Z., Liu, G. et al. Catalytic cracking of n-dodecane over hierarchical HZSM-5 zeolites synthesized by double-template method. J Porous Mater 24, 1679–1687 (2017). https://doi.org/10.1007/s10934-017-0410-5

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  • DOI: https://doi.org/10.1007/s10934-017-0410-5

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