Effect of Humidity on Formaldehyde Oxidation over Ce_0.8Zr_0.2O _y Catalyst

Abstract

In the preparation of a series of Ce_0.8Zr_0.2O _y catalysts catalyzing the removal of formaldehyde, BET, H₂-TPR, IR, SEM, XPS, and XRD were used to characterize the catalyst, and the influence of humidity on the catalyst activity was studied by adjusting the humidity during the process. The experimental results showed that the formaldehyde removal rate increased with the increase of humidity. When the humidity was higher than 50%, the formaldehyde removal rate decreased by 3% over that when the humidity was 50%.The characterization results showed that humidity facilitated the activation of oxygen and the formation of hydroxyl groups, which both promoted the formation and oxidative decomposition of intermediates and prevented the deposition of intermediates that clogged the pores, allowing more formaldehyde to be adsorbed and oxidized, which increased the activity of the catalyst. This provides new mechanistic evidence for the oxidation of formaldehyde and helps in the development of relatively low-cost materials for formaldehyde purification.

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Keywords

formaldehyde / humidity / Ce_0.8Zr_0.2O _y / catalytic oxidation

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