在氧化物的选择性催化还原过程中,强金属氧化物-地石相互作用
Jiebing He1, Jiang Deng1, Tianwei Lan1
1State Key Laboratory of Advanced Special Steel, Institute of Materials, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China.
新的Cu-SSZ-13 @ MnGdOx (Cu-Z @ MGO) 催化剂在150°C达到90%以上的NO转化,用于氨选择性催化还原 (NH3-SCR). 强烈的金属氧化物-化物相互作用 (SMZI) 提高了低温性能.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 更严格的欧盟VII排放标准要求在200°C以下的高NO转化对于机动车氨选择性催化还原 (NH3-SCR) 催化剂.
- 复合金属氧化物与化物是开发有效的低温SCR催化剂的关键策略.
研究的目的:
- 开发一种具有增强低温活性的新型NH3-SCR催化剂.
- 调查结构-活动关系和开发的催化剂的潜在机制.
主要方法:
- -SSZ-13 @ MnGdOx (-Z @ MGO) 复合催化剂的制备.
- 催化剂的结构和形态的表征.
- 在不同温度下对NO转化和N2选择性的催化性能评估.
主要成果:
- 在150°C时,Cu-Z @ MGO催化剂显示了90%以上的NO转化和95%的N2选择性.
- 在Cu-SSZ-13 (Cu-Z) 上观察到一个均的中孔MnGdOx (MGO) 层,在接口处有一个再结晶区.
- 强烈的金属氧化物-化物相互作用 (SMZI) 效应被确定为高低温活性的关键,促进MGO分散和Mn/Cu氧化还原循环.
结论:
- 开发的Cu-Z @ MGO催化剂由于SMZI效应而表现出优异的低温NH3-SCR性能.
- SMZI增强了MGO的分散,并促进了协同的Mn/Cu氧化还原循环,以有效地减少NO.
- 这一战略为设计符合严格排放标准的高性能催化剂提供了一个有希望的途径.
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