Stabilization of Pt in SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Microspheres at High Mechanical Resistance, Promoted with W Oxides for the Combustion of CO
This study shows the development of a combustion promoter for the oil-refining process called fluid catalytic cracking (FCC). The investigation of a catalyst prepared for the combustion of CO composed of 0.05 wt% Pt supported on SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3<...
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| Autores principales: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/4746b6e8722542309951cb193cd84c9c |
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| Sumario: | This study shows the development of a combustion promoter for the oil-refining process called fluid catalytic cracking (FCC). The investigation of a catalyst prepared for the combustion of CO composed of 0.05 wt% Pt supported on SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–0.5 wt% W microspheres with high mechanical resistance, promoted with tungsten oxides (WOx) that can inhibit the sintering of Pt, is reported. The addition of WO<i>x</i> in SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> inhibited the decrease in the specific area when calcined from 550 °C to 950 °C. SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> support in the form of calcined microspheres with average diameters between 70–105 µm were produced by spray drying, using two atomization discs with vanes of different geometry: a straight rectangular blade disc (DAR) and a curved rectangular vanes disc (DAC). The DAR disk produced whole microspheres, while the DAC had hollow and broken microspheres. The microspheres were characterized by XRD, SEM, optical microscopy, N<sub>2</sub> physisorption (BET area) and fracture resistance tests. The Pt catalysts were evaluated by TPR, H<sub>2</sub> chemisorption and CO combustion. The catalyst of 0.05 wt% Pt/SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–0.5 wt% turned out to be the most stable. A thermal stabilization effect was observed at contents lower than 1 wt% W that allowed it to inhibit the sintering of the Pt catalyst. |
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