Comparison of the performance for oxidation of formaldehyde on nano-Co3O4, 2D-Co3O4, and 3D-Co3O4 catalysts
Comparison of the performance for oxidation of formaldehyde on nano-Co3O4, 2D-Co3O4, and 3D-Co3O4 catalysts
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DOI：
10.1016/j.apcatb.2013.05.056
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发表时间：
2013-10-01
影响因子：
22.1
通讯作者：
Li, Junhua
中科院分区：
文献类型：
--
作者：
Bai, Bingyang;Arandiyan, Hamidreza;Li, Junhua
采用硬模板法制备了2D-Co 3 O 4和3D-Co 3 O 4催化剂，并采用沉淀法制备了纳米Co 3 O 4。考察了不同类型催化剂对甲醛氧化反应的催化活性。3D-Co 3 O 4催化剂在130 ℃和30，000 mL/（gh）的空速下获得100%的甲醛转化率，而2D-Co 3 O 4催化剂在相同空速条件下在150 ℃下完全氧化甲醛。活性的差异是由于硬模板法制备的介孔Co 3 O 4具有清晰的孔道结构，具有较大的比表面积和表面活性物种，允许反应物扩散并进行表面反应。3D-Co 3 O 4具有三维孔道结构、较大的比表面积、丰富的表面活性氧物种和暴露在（2 2 0）晶面上的活性Co 3+阳离子物种，具有最佳的甲醛氧化性能。在观察3D-Co 3 O 4 160 h后，甲醛的完全转化保持不变。因此，3D-Co 3 O 4催化剂对甲醛的催化活性和稳定性最好，在实际应用中可能是一种非贵金属催化剂。(c)2013爱思唯尔有限公司版权所有。
2D-Co3O4 and 3D-Co3O4 catalysts were prepared by the hard template method, and nano-Co3O4 was synthesized by precipitation method. The catalytic activity for the oxidation of formaldehyde over various types of catalysts was investigated. The 3D-Co3O4 catalyst attained a 100% conversion rate of formaldehyde at 130 degrees C with a space velocity of 30,000 mL/(gh), while the 2D-Co3O4 catalyst oxidized formaldehyde completely at 150 degrees C in the same space velocity conditions. The difference in activity is due to the clear channel structure of the mesoporous Co3O4 prepared by the hard template method, which has large specific surface area and surface active species that allows the reactant to diffuse and undergo surface reactions. The 3D-Co3O4 had the best performance of formaldehyde oxidation due to the three-dimensional porous channel structure, larger specific surface area, abundant active surface oxygen species and active Co3+ cationic species on the exposed (2 2 0) crystal face. Complete conversion of formaldehyde had remained the same after 3D-Co3O4 was observed for 160 h. Therefore, the 3D-Co3O4 catalyst has the best catalytic activity and stability for formaldehyde, which might be a non-noble catalyst for catalytic removal of formaldehyde in practical application. (c) 2013 Elsevier B.V. All rights reserved.