| Pd/Ce0.5Zr0.5O2三效催化剂负载方法 |
| 摘要点击 2876 全文点击 2723 投稿时间：2004-01-07 修订日期：2004-03-31 |
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| 中文关键词 三效催化剂 沉积沉淀法 Pd-载体 NOx吸附 负载方法 |
| 英文关键词 three-way catalyst deposition-precipitation Pd-support NOx adsorption loading method |
| DOI 10.13227/j.hjkx.20040605 |
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| 中文摘要 |
| 分别采用沉积沉淀、直接混合和传统的浸渍法制备1% Pd/Ce0.5Zr0.5O2 催化剂, 研究了Pd负载方法对催化剂活性影响.运用H2-TPR和原位漫反射红外(DRIFTS)研究了Pd-铈锆载体间的相互作用及Pd/Ce0.5Zr0.5O2催化剂上的三效反应机理.结果表明沉积沉淀法制备的Pd/Ce0.5Zr0.5O2催化剂(Pd-DP)表现出最强的Pd-载体作用及最优活性,原位红外实验发现Pd-DP上存在与传统的浸渍法制备的Pd-IMP催化剂不同的NO催化还原途径,推测Pd-载体间相互作用引起NO还原机理差异,进而导致活性差异.
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| 英文摘要 |
| Pd/Ce0.5Zr0.5O2 (CZ) catalysts were prepared by deposition-precipitation (DP), mixing (MIX) and conventional impregnation (IMP) methods, and the effects of the preparation methods on the three-way catalytic behaviors were investigated. Hydrogen temperature-programmed reduction (H2-TPR) and in situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were performed to understand the Pd-support interaction and the three-way catalytic reaction mechanisms. The experiments results reveal that the catalyst prepared by deposition-precipitation (DP) method shows the strongest Pd-support interaction and the best light-off performance. In situ DRIFTS results suggest that there exists alternative route of NO x reduction over Pd-DP catalyst. And it is supposed that Pd-support interaction leads to the difference of reaction mechanism and then the diversity of light-off performances. |
