Abstract
Encapsulation of metal nanoparticles is a leading technique used to inhibit the main deactivation mechanisms in dry reforming of methane reaction (DRM): Carbon formation and Sintering. Ni catalysts (15%) supported on alumina (Al2O3) and ceria (CeO2) have shown they are no exception to this analysis. The alumina supported catalysts experienced graphitic carbonaceous deposits, whilst the ceria showed considerable sintering over 15 h of DRM reaction. The effect of encapsulation compared to that of the performance of uncoated catalysts for DRM reaction has been examined at different temperatures, before conducting longer stability tests. The encapsulation of Ni/ZnO cores in silica (SiO2) leads to advantageous conversion of both CO2 and CH4 at high temperatures compared to its uncoated alternatives. This work showcases the significance of the encapsulation process and its overall effects on the catalytic performance in chemical CO2 recycling via DRM.
Highlights
Reversing the present trend of growing greenhouse gas levels in the atmosphere and climate change is one of the significant scientific problems of the time
Following the recovery of the materials, X-ray diffraction (XRD) characterization determined the presence of Following the recovery of the materials, XRD characterization determined the presence of carbon, carbon, which appeared as a peak at 26° on all samples and a second peak at 42° on the Ni/ZnO@SiO2 which appeared as a peak at 26◦ on all samples and a second peak at 42◦ on the Ni/ZnO@SiO2 material material that is indicative of the development of graphitic carbon (JCPDS No 75-1621) (Figure 6) [47], that is indicative of the development of graphitic carbon (JCPDS No 75-1621) (Figure 6) [47], as XRD
This work serves to demonstrate the advantages of Ni/ZnO@SiO2 Yolk shell particles over two traditional catalytic materials: Ni/CeO2 and Ni/Al2 O3
Summary
Reversing the present trend of growing greenhouse gas levels in the atmosphere and climate change is one of the significant scientific problems of the time. Another study investigated an analogous material, 11 wt.% Ni/Ce@SiO2 in the yolk shell morphology, with a consistent ~100% conversion of CO2 at 750 ◦ C for 40 h, only at very low space velocities (WHSV = 6000 mL g−1 h−1 ) [26] Noble metals such as platinum and rhodium are known to have significant resistance to coking compared to nickel catalysts [27,28]. Yolk-shell catalysts are an exceptional improvement of the metal core-shell structure, with a characteristic void between the core and the shell which allows a configuration, offering a homogeneous reaction environment, while creating a high surface area to volume ratio [21] Under these premises, the intention of this work was to compare traditional materials such as.
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