N<sub>2</sub>O在钾改性Cu-Co尖晶石型复合氧化物上的催化分解

窦喆; 张海杰; 潘燕飞; 徐秀峰

N₂O在钾改性Cu-Co尖晶石型复合氧化物上的催化分解

烟台大学化学化工学院, 山东省化学工程与过程重点实验室, 山东烟台 264005

基金项目: Research Project from Shandong Provincial Department of Science and Technology (2012GSF11708).

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中图分类号: O643
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出版历程
- 收稿日期: 2013-09-01
- 修回日期: 2013-12-04
- 刊出日期: 2014-02-28

Catalytic decomposition of N₂O over potassium-modified Cu-Co spinel oxides

School of Chemistry and Chemical Engineering; Shandong Provincial Key Lab of Chemical Engineering and Process, Yantai University, Yantai 264005, China

Funds: Research Project from Shandong Provincial Department of Science and Technology (2012GSF11708).

摘要

摘要: 制备了几个不同组成的Cu-Co尖晶石型复合氧化物，用于N₂O分解反应，在活性较高的Cu_0.8Co_0.2Co₂O₄表面浸渍碱金属盐溶液，制备改性催化剂，考察了碱金属助剂类型、钾前驱物和钾负载量等对改性催化剂活性的影响。用BET、XRD、SEM、XPS等方法表征了催化剂结构。结果表明，几种碱金属碳酸盐改性Cu_0.8Co_0.2Co₂O₄的催化活性发生了显著变化，其中，K改性催化剂的活性有明显提高，而Cs的表面改性反而降低了催化剂活性；钾前驱物对K/Cu-Co的催化活性也有较大影响，其中，加入碳酸钾明显提高了催化剂的活性，而加入硝酸钾和醋酸钾反而降低了催化剂活性；有氧无水、有氧有水气氛中，400 SymbolpB@C下N₂O在碳酸钾改性催化剂0.05K/Cu_0.8Co_0.2Co₂O₄上的转化率分别达到了100%和87.6%；该催化剂在400 SymbolpB@C下的恒温反应活性和稳定性均高于未改性催化剂。
- N₂O催化分解 /
- Cu-Co复合氧化物 /
- 助剂钾 /
- 催化活性
Abstract: Cu-Co spinel oxides with different compositions were prepared for N₂O catalytic decomposition in the presence of oxygen. The active catalyst of Cu_0.8Co_0.2Co₂O₄ was incipiently impregnated by alkali metal salt solutions to prepare the modified catalysts. These catalysts were characterized by BET, XRD, SEM and XPS techniques, and their catalytic activity for N₂O decomposition was tested. The effect of alkali metal species, potassium precursors and potassium loadings on catalytic activity was investigated. It was found that the catalytic activity of Cu_0.8Co_0.2Co₂O₄ modified by K₂CO₃ was much higher than that of bare oxide, while Cs/Cu_0.8Co_0.2Co₂O₄ was inferior to Cu_0.8Co_0.2Co₂O₄ for N₂O decomposition. In the case of K/Cu_0.8Co_0.2Co₂O₄ with different potassium precursors, the catalyst activity was largely enhanced by the addition of K₂CO₃, while the doping of KNO₃ and CH₃COOK notably depressed the catalytic activity. Over the optimal catalyst of 0.05K/Cu_0.8Co_0.2Co₂O₄, 100% and 87.6% conversion of N₂O was reached at 400 SymbolpB@ C under the atmosphere of oxygen only and oxygen-steam together, respectively. In addition, K₂CO₃-modified catalyst in both reaction atmospheres showed higher stability than un-modified catalyst.
- catalytic decomposition of N₂O /
- Cu-Co mixed oxides /
- potassium additive /
- catalytic activity

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参考文献(14)

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