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论文类型：期刊论文

发表时间：2012-08-15

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI、Scopus

卷号：200

页面范围：729-737

ISSN号：1385-8947

关键字：Formaldehyde; Storage; Catalytic oxidation; Silver catalysts

摘要：Catalytic removal of indoor HCHO was proposed to proceed in a "storage-oxidation" cycling process. Two kinds of supported silver catalysts, namely Ag/HZSM-5 and Ag-MnOx-CeO2. were investigated as catalysts for this cycling process. Due to the highly dispersed silver clusters formed and its good redox properties, the Ag-MnOx-CeO2 catalyst showed better HCHO oxidation properties in both the storage phase (HCHO partial oxidation to HCOO- at room temperature) and oxidation-regeneration phase (total oxidation of the formates into CO2 and H2O at elevated temperatures). The presence of H2O (RH = 50%, 25 degrees C) was found to enhance the HCHO storage capacity for Ag-MnOx-CeO2 catalyst, while competitive adsorption of HCHO with H2O was observed over Ag/HZ catalyst. The results of DRIFTS indicate that the partial oxidation of HCHO into HCOO- is accelerated by the presence of H2O over the Ag-MnOx-CeO2 catalyst. In addition, the catalyst saturated with HCHO can be in situ regenerated without production of secondary pollutants and can be used repeatly. It is suggested that this is a promising approach for indoor HCHO elimination. (C) 2012 Elsevier B.V. All rights reserved.