Abstract
This study was conducted to investigate the effect of reducing pretreatment on physicochemical properties of zeolite catalysts and their performances on formaldehyde (HCHO) oxidation at ambient temperature. Pd/TS-1(Fresh) was tailored by different reductive gases (H2, CO) and liquid agents [ascorbic acid (AA), ethylene glycol (EG), sodium borohydride (NaBH4)]. Based on the characterization of HRTEM and CO chemisorption, it was shown that the reducing treatment could significantly reduce the size of Pd nanoparticles (NPs) based on the good dispersion of noble metal. The smallest size of Pd nanoparticles with 5.1 nm was achieved by using NaBH4 as reducing agent. Accordingly, the best activity was observed on the Pd/TS-1(NaBH4) sample, pretreated by NaBH4 in aqueous solution, which could eliminate HCHO completely even at room temperature. Combined with Raman, H2-TPR, and CO-DRIFT, the excellent catalytic performance of Pd/TS-1(NaBH4) are mainly ascribed to the high Pd dispersion, superior redox properties and abundant active O2 species.
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