Novel nanoporous MnO_x (x = ∼1.75) sorbent for the removal of SO₂ and NH₃ made from MnC₂O₄·2H₂O

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• 作者：Xiaowei Ma^a ; Nicholas Campbell^a ; Lé ; naï ; c Madec^a ; Matthew A. Rankin^b ; Lisa M. Croll^b ; J.R. Dahn^a ; ^c ; ^{jeff.dahn@dal.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Nanoporous manganese oxide ; Oxalate ; Calcination ; BET surface area ; Dynamic flow test ; Respirators
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：465
• 期：Complete
• 页码：323-332
• 全文大小：3484 K

文摘

In this work, nanoporous manganese oxides (MnO_x) were prepared by thermal decomposition of MnC₂O₄·2H₂O at 225 °C for 6 h in air. The manganese oxalate dihydrate precipitate was made from manganese sulfate and ammonium oxalate during ultrasonication and stirring. The physical properties of the oxalate precursors and the resulting MnO_x samples were characterized with SEM, TGA–DSC, FTIR and powder XRD. The specific surface areas and porosity of MnO_x were studied by single-point BET and multi-point N₂ adsorption–desorption measurements. The amorphous MnO_x from oxalate prepared by sonication showed a specific surface area as large as 499.7 m²/g. Dynamic SO₂ and NH₃ flow tests indicated that the adsorption capacity of MnO_x, especially for SO₂, can be increased by increased surface area. Compared to the best Mn₃O₄-impregnated activated carbon adsorbent, nanoporous MnO_x could remove approximately three times as much SO₂ and a comparable amount of NH₃ per gram of adsorbent. This could lead to respirators of lower weight and smaller size which will be attractive to users.