Abstract
Propane dehydrogenation (PDH) is the extensive pathway to produce propylene, which is as a very important chemical building block for the chemical industry. Various catalysts have been developed to increase the propylene yield over recent decades; however, an active site of monometallic Pt nanoparticles prevents them from achieving this, due to the interferences of side-reactions. In this context, we describe the use of promoter-free hierarchical Pt/silicalite-1 nanosheets in the PDH application. The Pt dispersion on weakly acidic supports can be improved due to an increase in the metal-support interaction of ultra-small metal nanoparticles and silanol defect sites of hierarchical structures. This behavior leads to highly selective propylene production, with more than 95% of propylene selectivity, due to the complete suppression of the side catalytic cracking. Moreover, the oligomerization as a side reaction is prevented in the presence of hierarchical structures due to the shortening of the diffusion path length.
Highlights
Propylene is one of the most important petrochemical building blocks for the production of a diverse range of products, from solvents to plastics and other valuable intermediates, for example, polypropylene, acrylonitrile, acrolein, and acrylic acid
We report the example of a highly selective propane dehydrogenation over monometallic nanoparticles supported on weakly acidic siliceous MFI-type zeolite having the hierarchical nanosheet structure
There were no detectable PtO2 characteristics in X-ray diffraction (XRD) patterns of all supports indicating indicating the well dispersion of Pt or the relatively low amount of Pt loading (Figure 1A)
Summary
Propylene is one of the most important petrochemical building blocks for the production of a diverse range of products, from solvents to plastics and other valuable intermediates, for example, polypropylene, acrylonitrile, acrolein, and acrylic acid. Catalysts 2019, 9, 174 reference [7] and the Oleflex process from Universal Oil Products (or Honeywell UOP) [8] Because this reaction is a highly endothermic process and equilibrium-limited reaction, the relatively high temperature (above 550 ◦ C) is usually required for promoting the catalytic activity. This behavior facilitates several side-reactions, in particular, thermal/catalytic cracking and coke formation, resulting in the low propylene selectivity and the rapid deactivation of catalysts [9]. A great challenge to develop this process, especially in terms of increasing the efficiency of catalysts exhibiting high selectivity and stability in such severe operating conditions for the industrial production of propylene
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