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Dehydrogenation of Propane to Propylene with Highly Stable Catalysts of Pt-Sn Supported Over Mesoporous Silica KIT-6

  • Jose P. Ruelas-Leyva EMAIL logo , Alejandro Mata-Martinez , Alfonso Talavera-López , Sergio A. Gómez , Sergio A. Jimenez-Lam and Gustavo A. Fuentes
Published/Copyright: April 18, 2018

Abstract

During several reactions, similar to dehydrogenation of propane to propylene, coke is one of the main reasons for the catalyst deactivation. The coke formation and further deactivation of the catalyst are strongly dependent to the active site in the catalyst and/or the properties of the support. KIT-6 with interconnected porous and high surface area can handle with the coke formation, and can disperse easily the deposited Pt nanoparticles. In this sense, a series of Pt-Sn/KIT-6 catalysts were synthesized with distinct Sn loadings and used in the dehydrogenation of propane. The performance of these catalysts during reaction varied with the Sn loading. The specific activities for propylene formation obtained with the catalysts were comparable to the best result reported in the literature. The nanoparticles present in the catalyst through pretreatment and reaction condition was the Pt-Sn alloy (1:1 atomic ratio), and that alloy is suggested to be the active phase. This Pt-Sn alloy was stable during the entire reaction time, that even in two catalysts containing a considerable amount of coke, deactivation was not observed. Also, the support (KIT-6) with high connectivity helped to avoid deactivation by coke.

Acknowledgements

This work was financially supported by the Mexican National Council for Science and Technology (CONACyT; project CB-2015-01 # 256268); and the Autonomous University of Sinaloa (UAS; project PROFAPI-2015/251).

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A Appendix

The results of the nitrogen adsorption-desorption isotherms of KIT-6 can be seen in the Figure 7. The isotherm is type IV with a specific surface area, pore volume and pore diameter of 809 m2/g, 0.93 cm3/g and 45.8 Å, respectively. These values are in agreement with those reported in the literature for similar samples (Kleitz, Choi, and Ryoo 2003; Kleitz et al. 2010).

Figure 7: Nitrogen adsorption-desorption isotherms of KIT-6.
Figure 7:

Nitrogen adsorption-desorption isotherms of KIT-6.

The XRD analyses for the KIT-6 support are given in Figure 8. The low-angle diffraction pattern shows evidence of two reflections at 2 Teta values of 0.94° and 1.72° corresponding to the interplanar spacing (211) and (420), respectively (Kleitz, Choi, and Ryoo 2003; Kleitz et al. 2010).

Figure 8: Low-angle XRD analysis of KIT-6.
Figure 8:

Low-angle XRD analysis of KIT-6.

Received: 2017-12-18
Revised: 2018-03-08
Accepted: 2018-03-13
Published Online: 2018-04-18

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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