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分层的SAPO-34催化剂作为Cu Active站点的主机
Julio C Fernandes Pape Brito1, Ivana Miletto2, Leonardo Marchese3
1Department for Sustainable Development and Ecological Transition, Università del Piemonte Orientale, Piazza Sant'Eusebio 5, 13100 Vercelli, Italy.
Materials (Basel, Switzerland)
|August 26, 2023
概括
使用新的模板方法合成了带有铜 (Cu) 的分层SAPO-34催化剂. 这些催化剂对使用碳化合物 (HC-SCR) 进行氧化物 (NOx) 选择性催化降解具有前景.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 环境化学环境化学
背景情况:
- 氧化物 (NOx) 的选择性催化降解 (SCR) 对于排放控制至关重要.
- 与传统的微孔材料相比,层次式热石提供了更好的质量转移特性.
- 开发高效的HC-SCR催化剂对于减少有害排放至关重要.
研究的目的:
- 使用不同的中孔模板合成含Cu的分层SAPO-34催化剂.
- 调查模板剂对催化剂结构和Cu结合的影响.
- 评估这些催化剂在NOx与碳化合物的选择性催化降解中的性能.
主要方法:
- 在MSN中使用CTAB并将糖作为中等孔模板进行分层SAPO-34的自下而上的合成.
- 使用结构和光谱技术 (例如,DR UV-Vis) 进行物理化学表征.
- 用碳化合物 (HC-SCR) 选择性催化降解NO的催化活性评估.
主要成果:
- 在有序的半孔纳米颗粒 (MSN) 中封装的CTAB在分层SAPO-34中产生了高比例的Cu交换位点.
- 合成的催化剂表现出高的中孔表面积和体积.
- 纹理特性,高Cu负载和Cu位点特异化/局部化之间的协同作用导致了有希望的HC-SCR性能.
结论:
- 中等孔模板剂的选择对SAPO-34的等级结构和Cu的整合有很大的影响.
- 使用CTAB/MSNs合成的层次式SAPO-34显示出作为HC-SCR有效催化剂的潜力.
- 在层次框架内优化Cu的分类和定位是有效减少NOx的关键.
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