Development of novel materials and methodologies for removal of toxic and poisonous carbon monoxide (CO) gas is important to solve serious health and environmental related problems. Existing materials used for the removal of CO gas are quite expensive and therefore, the synthesis of low‐cost and earth‐abundant catalyst for CO oxidation is urgently needed. In the present work, we report the preparation of Pd nanoparticles loaded on porous carbon supports from the spent Pd/C and the subsequent catalytic oxidation of CO. Different Pd based catalysts are prepared by using various reducing agents with different reduction potential such as formaldehyde, green tea, ascorbic acid, and sodium borohydride. The prepared catalysts are characterized and employed for the oxidation of CO. All the prepared catalysts show excellent activity towards CO oxidation at room temperature either in presence or absence of moisture depending on the Pd0/Pd+2 ratio in Pd/C which follows the order Pd/C−NaBH4>Pd/C−HCHO>Pd/C−Ascorbic acid>Pd/C−Green tea. Experimental findings of the present work also reveal that depending on the oxidation state, and moisture plays a critical role in Pd catalytic properties on the oxidation of CO. Theoretical calculations performed using Vienna ab initio Simulation Package (VASP) support the experimental observations and further confirm that the reaction proceeds through Langmuir‐Hinshelwood mechanism.
The Cover Feature illustrates the use of green tea and NaBH4 as agents for the reduction of a Pd/C catalyst for the efficient oxidation of CO. In their Full Paper, A. Palliyarayil et al. demonstrate the efficient CO oxidation activity of Pd2+/C derived from waste sources in presence of moisture at room temperature. Different reducing agents such as green tea, sodium borohydride, formic acid and ascorbic acid are considered to control the oxidation state of Pd in the Pd/C catalyst. The correlation between the Pd oxidation state and moisture towards the CO oxidation is investigated both empirically and computationally. The spent Pd/C catalyst reduced by NaBH4 shows the best activity in both presence and absence of moisture whereas the catalyst prepared using green tea showed the highest activity for the CO oxidation in the presence of moisture at room temperature. More information can be found in the Full Paper by A. Palliyarayil et al.
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