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Abstract
The catalytic dehydrogenation of propane to propene is an alternative technique to supplement the traditional steam cracking and catalytic cracking process for satisfying the continuously increasing demand for propylene downstream products. In this study, the parent PtSn/γ-Al2O3 catalyst was fabricated via the one-step method for the subsequent La post-modification to prepare the catalysts for propane dehydrogenation. The prepared and spent catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption, scanning electron microscope (SEM), NH3 temperature-programmed desorption (NH3-TPD), H2 temperature-programmed desorption (H2-TPR), and thermogravimetric (TG) analysis. The catalytic performance and characterization results demonstrated that the addition of La into the parent catalyst could significantly improve the catalytic performance of the prepared catalyst. Especially, the PtSn-La2.2 catalyst with the 2.2 wt.% La addition exhibited the stable and highest propylene selectivity (>84%) under the investigation time of 800 min. The introduced La exhibits the ability to adjust the textural properties of the obtained catalysts, curb the acidity of support, promote the reduction of Pt species, and reduce the carbon accumulation on the prepared catalysts.
Highlights
Propylene, as one of the most important types of compounds in the modern petrochemical industry, is mainly used to produce polypropylene, acrylonitrile, propylene oxide, and other important intermediates [1,2,3,4,5,6,7]
The diffraction peaks corresponding to Pt, Sn, and La are not detected by X-ray diffraction (XRD) because of the extremely low loading
These results reveal that the addition of La can significantly reduce the carbon deposition on the prepared catalysts, prolong the catalyst lifetime
Summary
As one of the most important types of compounds in the modern petrochemical industry, is mainly used to produce polypropylene, acrylonitrile, propylene oxide, and other important intermediates [1,2,3,4,5,6,7]. Propylene is traditionally supplied from the steam cracking and the catalytic cracking process of naphtha or other oil byproducts [8]. The domestic and international market demand for propylene is dramatically growing with the continuous exploitation of propylene downstream products. There is an ever-growing gap between the demand for propylene and the productivity of traditional processes. Some on-purpose propylene production technologies (e.g., methanol to olefins, methanol to propylene, propane dehydrogenation, etc.) are widely developed to satisfy the increasing demand for propylene. Among these technologies, the propane dehydrogenation (PDH), regarded as a potential and high value-added propylene production route, has gained
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