Abstract
Highly dispersed ultra-small Pt nanoparticles limited in nanosized silicalite-1 zeolite were prepared by in situ encapsulation strategy using H2PtCl6·6H2O as a precursor and tetrapropylammonium hydroxide as a template. The prepared Pt@S-1 catalyst was characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), N2 adsorption-desorption, CO adsorption, and TGA techniques and exhibited unmatched catalytic activity and sintering resistance in the partial oxidation of methane to syngas. Strikingly, Pt@S-1 catalyst with further reduced size and increased dispersibility of Pt nanoparticles showed enhanced catalytic activity after low-temperature oxygen calcination. However, for Pt/S-1 catalyst, low-temperature oxygen calcination did not improve its catalytic activity.
Highlights
Methane has received extensive attention as a clean and efficient resource
The introduction of Pt species within the nanosized S-1 zeolite had a scarce effect on the crystallinity, which can be demonstrated by the fact that the peaks associated with the MFI structure in the X-ray diffraction (XRD) patterns were unchanged
We found a significant increase in the quality of the remove surfactants and organic templating agents [36]
Summary
Methane has received extensive attention as a clean and efficient resource. Methane utilization is divided into direct utilization and indirect utilization and the route of indirect use of methane to syngas is economically feasible [1,2]. There are three common methods for producing synthesis gas from methane: The steam reforming [3,4], the dry reforming [5,6] and the partial oxidation of methane (POM) [7,8]. POM is one of the most powerful processes for the production of downstream chemical products, especially methanol and Fischer–Tropsch synthesis [9,10,11]. Noble metals catalyzed by POM reactions exhibit incomparable catalytic performance and carbon deposition resistance [12,13]. Thanks to the high price of noble metals, its research and application are limited
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