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    Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite

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    Type
    Conference Paper
    Authors
    Akhtar, M. N.
    Al-Yassir, N.
    Al-Khattaf, S.
    Čejka, Jiří
    KAUST Grant Number
    K-C1-019-12
    Date
    2012-01
    Permanent link to this record
    http://hdl.handle.net/10754/600097
    
    Metadata
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    Abstract
    Aromatization of hexane and propane was investigated over Pt promoted mesoporous gallium-containing HZSM-11 with controlled mesoporosity generated by desilication. Prepared catalysts were characterized by nitrogen adsorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared of chemisorbed pyridine, and NH 3 temperature programmed desorption confirming the development of intracrystalline mesoporosity of Ga-containing HZSM-11. The catalytic activities, which were compared in the aromatization of n-hexane and propane, increased upon desilication. The aromatization of n-hexane decreased in the following order, Pt/mesoporous GaZSM-11 Pt/conventional GaZSM-11 mesoporous GaZSM-11 > conventional GaZSM-11. Hexane conversion reached 70.1% over mesoporous Pt/GaZSM-11 with Si/Ga of 61, as compared with 29.6 and 24.9% for corresponding mesoporous and conventional GaZSM-11 (Si/Ga = 94), respectively, for experiments at liquid hour space velocity of 3.6 h -1, and 540 °C. Comparison of BTX (benzene-toluene-xylene) selectivity at the conversion level of ∼21.0% revealed that Pt/mesoporous GaZSM-11 is more selective than corresponding mesoporous and conventional GaZSM-11. The BTX selectivity over Pt/mesoporous GaZSM-11 (Si/Ga = 94), which showed strong dependence on the conversion, reached 28.2%, whereas over corresponding mesoporous and conventional GaZSM-11catalysts reached 19.1% and 5.5%, respectively. A higher conversion and better selectivity can be attributed to the improved accessibility to the active extra-framework Ga species owing to the generation of mesopores inside the zeolite particles and shortening the contact time. It is worth mentioning that the prepared catalysts exhibited quite low activity in propane aromatization but exhibiting similar trends as for hexane aromatization. © 2011 Elsevier B.V. All rights reserved.
    Citation
    Akhtar MN, Al-Yassir N, Al-Khattaf S, Čejka J (2012) Aromatization of alkanes over Pt promoted conventional and mesoporous gallosilicates of MEL zeolite. Catalysis Today 179: 61–72. Available: http://dx.doi.org/10.1016/j.cattod.2011.06.036.
    Sponsors
    The authors would like to express their appreciations to King Abdulaziz City for Science and Technology for their financial support under project No. 12-3MT. The financial support made by King Abdullah University of Science and Technology (KAUST) (Award No. K-C1-019-12) is highly appreciated. The authors would like also to extend their appreciation to the support from King Fahd University of Petroleum and Minerals.
    Publisher
    Elsevier BV
    Journal
    Catalysis Today
    DOI
    10.1016/j.cattod.2011.06.036
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cattod.2011.06.036
    Scopus Count
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