1. Comparative Study of Commercial Silica and Sol-Gel-Derived Porous Silica from Cornhusk for Low-Temperature Catalytic Methane Combustion.
- Author
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Owusu Prempeh, Clement, Hartmann, Ingo, Formann, Steffi, Eiden, Manfred, Neubauer, Katja, Atia, Hanan, Wotzka, Alexander, Wohlrab, Sebastian, and Nelles, Michael
- Subjects
POROUS silica ,COMBUSTION ,CATALYST supports ,CATALYTIC activity ,TEMPERATURE-programmed reduction ,CERIUM oxides ,MESOPOROUS silica - Abstract
The synthesis and characterization of sol-gel-derived cornhusk support for low-temperature catalytic methane combustion (LTCMC) were investigated in this study. The prepared cornhusk support was impregnated with palladium and cerium oxide (Pd/CeO
2 ) via the classical incipient wetness method. The resulting catalyst was characterized using various techniques, including X-ray diffraction (XRD), N2 physisorption (BET), transmission electron microscopy (TEM), and hydrogen temperature-programmed reduction (H2 -TPR). The catalytic performance of the Pd/CeO2 /CHSiO2 catalyst was evaluated for methane combustion in the temperature range of 150–600 °C using a temperature-controlled catalytic flow reactor, and its performance was compared with a commercial catalyst. The results showed that the Pd/CeO2 dispersed on SiO2 from the cornhusk ash support (Pd/CeO2 /CHSiO2 ) catalyst exhibited excellent catalytic activity for methane combustion, with a conversion of 50% at 394 °C compared with 593 °C for the commercial silica catalyst (Pd/CeO2 /commercial). Moreover, the Pd/CeO2 /CHSiO2 catalyst displayed better catalytic stability after 10 h on stream, with a 7% marginal loss in catalytic activity compared with 11% recorded for the Pd/CeO2 /commercial catalyst. The N2 physisorption and H2 -TPR results indicated that the cornhusk SiO2 support possessed a higher surface area and strong reducibility than the synthesized commercial catalyst, contributing to the enhanced catalytic activity of the Pd/CeO2 /SiO2 catalyst. Overall, the SiO2 generated from cornhusk ash exhibited promising potential as a low-cost and environmentally friendly support for LTCMC catalysts. [ABSTRACT FROM AUTHOR]- Published
- 2023
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