Catalytic formaldehyde removal by "storage-oxidation" cycling process over supported silver catalysts

被引：107
作者：
Shi, Chuan [1 ,2 ]
Chen, Bing-bing [1 ,2 ]
Li, Xiao-song [2 ]
Crocker, Mark [3 ]
Wang, Yu [1 ,2 ]
Zhu, Ai-min [2 ]
机构：
[1] Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn MOE, Dalian, Peoples R China
[2] Dalian Univ Technol, Lab Plasma Phys Chem, Dalian, Peoples R China
[3] Univ Kentucky, Ctr Appl Energy Res, Lexington, KY 40511 USA
来源：
CHEMICAL ENGINEERING JOURNAL | 2012年 / 200卷
基金：
中国国家自然科学基金;
关键词：
Formaldehyde; Storage; Catalytic oxidation; Silver catalysts; FT-IR; DECOMPOSITION; ADSORPTION; METHANOL; SURFACE; CERIUM; OXIDES;
D O I：
10.1016/j.cej.2012.06.103
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
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.
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收藏
页码：729 / 737
页数：9
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