| 丁鑫,李国波,黄俊,张春阳,张亚平,王玲.Pd改性多活性位点催化剂NH3-SCR脱硝反应机理研究[J].分子催化,2022,36(1):1-11 |
| Pd改性多活性位点催化剂NH3-SCR脱硝反应机理研究 |
| Study on Denitration Reaction Mechanism of Pd Modified Multiactive Site Catalyst NH3-SCR |
| 投稿时间：2021-12-27 修订日期：2022-01-15 |
| DOI：10.16084/j.issn1001-3555.2022.01.001 |
| 中文关键词: SCR 多活性位点 催化剂 吸附 机理 |
| 英文关键词:selective catalytic reduction multi-active site catalyst adsorption mechanism |
| 基金项目:国家重点研发计划（2018YFC1902602） |
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| 摘要点击次数: 1394 |
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| 中文摘要: |
| 低温SCR脱硝技术具有效率高、能耗低、无二次污染等优点，是很有前途的脱硝净化技术.我们制备了一系列多活性位点催化剂（PdxVy/TiO2），并对其NH3-SCR脱硝性能进行了测试分析.结果表明，Pd0.12V4/TiO2催化剂在250℃时可达到接近100%的NOx转化率和N2选择性.结合XRD、TEM、XPS、H2-TPR、in situ DRIFT和DFT分析，考察了催化剂表面NOx催化脱除机理.所得数据表明，该催化剂对NH3、O2和NOx等反应气体分子表现出强烈的吸附性能，且均为化学吸附，所有组分（PdOx和VOx）在NOx的催化脱除中发挥着不可或缺的作用，而氧化还原循环（2V4+（Ti3+）+Pd2+ → 2V5+（Ti4+）+Pd0）归功于其优越的NOx催化性能，催化剂表面同时存在E-R机理与L-H机理. |
| 英文摘要: |
| Low temperature SCR denitration technology has the advantages of high efficiency, low energy consumption, no secondary pollution and so on, which is a promising denitration purification technology. In this work, a multi-active center (PdxVy/TiO2) catalysts were prepared, and the catalytic removal of NOx was investigated. The results show that the NOx conversion and N2 selectivity of Pd0.12V4/TiO2 catalyst can reach nearly 100% at 250℃. Combined with XRD, TEM, XPS, H2-TPR, in situ DRIFT and DFT analysis, the catalytic removal on catalyst surface mechanism of NOx was investigated. The obtained data revealed that the catalyst has strong adsorption capacity for NH3, O2 and NOx, and all components (PdOx and VOx) play an indispensable role in the catalytic removal of NOx, all components (PdOx and VOx) of the catalyst play an indispensable role in CB oxidation removal, and the redox cycle (2V4+(Ti3+) + Pd2+→2V5+(Ti4+) + Pd0) was attributed to its superior NOx catalytic performance, and there were both E-R and L-H mechanisms on the catalyst surface. |
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