Cyclodextrin-cobalt (II) molecule-ion pairs as precursors to active Co3O4/ZrO2 catalysts for the complete oxidation of formaldehyde: Influence of the cobalt source
Cyclodextrin-cobalt (II) molecule-ion pairs as precursors to active Co3O4/ZrO2 catalysts for the complete oxidation of formaldehyde: Influence of the cobalt source
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DOI：
10.1016/j.jcat.2016.07.006
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发表时间：
2016-09-01
影响因子：
7.3
通讯作者：
Ponchel, Anne
中科院分区：
文献类型：
--
作者：
Bai, Lei;Wyrwalski, Frederic;Ponchel, Anne
本文报道了β-环糊精（β-CD）在浸渍法制备氧化锆负载钴氧化物催化剂中的应用及其对甲醛完全氧化的性能。通过紫外-可见光谱、动态光散射、质谱、热重-质谱分析、X-射线衍射和程序升温还原等方法，研究了β-CD对三种钴前体（硝酸钴、乙酸钴和乙酰丙酮钴）在不同制备阶段的影响。结果发现，β-CD对催化剂的最终性质有很大的影响，无论是在还原性和分散的活性物种。结果合理化钴前体和β-CD之间的络合的发生，并强调了抗衡阴离子发挥的关键作用。使用硝酸钴与β-CD/钴比0.1获得最佳组合，而环糊精对浸渍方法的有益影响成功地扩展到其他环糊精（α-CD和γ-CD）。(C)2016 Elsevier Inc. All rights reserved.
The present paper reports on the use of beta-cyclodextrin (beta-CD) during the preparation of zirconiasupported cobalt oxide catalysts by impregnation and their performances in the complete oxidation of formaldehyde. The effect of beta-CD was carefully characterized at different stages of the preparation with respect to three cobalt precursors (i.e. cobalt nitrate, acetate and acetylacetonate) by UV-Vis spectroscopy, dynamic light scattering, mass spectrometry, TG-MS analysis, X-ray diffraction and temperature-programmed reduction. It was found that beta-CD had a strong impact on the final properties of catalysts, both in terms of reducibility and dispersion of active species. The results were rationalized to the occurrence of complexation between the cobalt precursor and beta-CD and highlighted the pivotal role played by the counteranion. The best combination was obtained using cobalt nitrate with a beta-CD/cobalt ratio 0.1 while the beneficial impact of cyclodextrins for the impregnation method was successfully extended to other cyclodextrins (alpha-CD and gamma-CD). (C) 2016 Elsevier Inc. All rights reserved.