Journal
CATALYSIS TODAY
Volume 281, Issue -, Pages 412-417Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2016.05.037
Keywords
Sodium addition; Pd/TiO2; Formaldehyde; Room temperature; Promoter-metal interaction
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Developing an effective material for indoor HCHO elimination at ambient temperature is of great significance. In this work, a series of Pd/TiO2 catalysts with different Na loadings were prepared and tested for their activity in HCHO oxidation. The results indicated that Na addition had a remarkable promotion effect on Pd/TiO2 catalysts for HCHO oxidation, and the optimal Na loading was 2 wt.%. Features of the catalysts including the reducibility, Pd dispersion and valence state of Pd and O were elucidated using a variety of characterization techniques. The results showed that 2.0Na-Pd/TiO2 exhibited more exposure of active Pd sites and contained abundant surface OH groups, giving it the best HCHO catalytic oxidation performance of the studied catalysts. The 2.0Na-Pd/TiO2 catalyst also had high resistance to effects of space velocity and relative humidity (RH), maintaining high HCHO conversion over a wide gas hourly space velocity range of 80,000-190,000h(-1) and RH of 25%-65%. (C) 2016 Elsevier B.V. All rights reserved.
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