Preparation and characterization of SBA-15 supported Pd catalyst for CO oxidation

SBA-15 supported noble metal catalysts for CO oxidation have been extensively investigated. However, no reported work on the SBA-15 supported palladium catalyst for CO oxidation can be found in the literature. In this work, highly dispersed palladium nanoparticles were synthesized within the uniform channels of SBA-15 via a glow discharge plasma reduction treatment. The obtained Pd/SBA-15 catalyst shows a good activity for CO oxidation. The activity can be further improved by the hydrogen reduction thermally. The low-angle X-ray diffraction (XRD) patterns and transmission electron microscope (TEM) indicate that the ordered mesoporous structure was well maintained during the catalyst preparation and reaction processes. The wide-angle XRD patterns and TEM images show that the spherical palladium nanoparticles are highly dispersed within the SBA-15 channels and remain stable after the reaction. The diffuse reflectance infrared Fourier transformation (DRIFT) spectroscopy of adsorbed CO confirms that the structure change caused by different preparation conditions has a significant influence on the activity of the catalyst.

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• Highly dispersed nanoparticles were synthesized within the uniform channels via a glow discharge plasma treatment.
• The activity of the Pd/SBA-15 catalyst on CO oxidation was firstly evaluated.
• The highly dispersed nanoparticles remain stable after the reaction.
• The Pd/SBA-15 catalysts show a good activity on CO oxidation.
• The catalyst preparation method has a significant influence on the catalyst activity.