通过固定隔离的Fe-Cl站点来提高脱的Fe基催化剂的稳定性和活性
Fan Xue1, Jingnan Wang2, Panpan Li3
1Key Laboratory of Luminescence and Optical Information Technology, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, P. R. China.
这项研究引入了一种新的Fe-Cl/Al2O3催化剂,用于脱 (PDH). 固定单原子Fe-Cl位点显著提高了催化剂的稳定性和活性,超过了现有的基于Fe的催化剂.
科学领域:
- 不同质的催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 基于铁的催化剂由于其环保性质和催化活性,对脱 (PDH) 是有前途的.
- 同时提高这些催化剂的稳定性和活性仍然是一个重大挑战.
- 现有的单原子Fe/Al2O3催化剂在性能和耐用性方面面临限制.
研究的目的:
- 为脱 (PDH) 开发一种高度稳定和活性的基于Fe的催化剂.
- 通过定单原子Fe-Cl位,协同增强催化剂的稳定性和活性.
- 为了研究新型Fe-Cl/Al2O3催化剂的结构-活性关系.
主要方法:
- 合成一种新的Fe-Cl/Al2O3催化剂,通过在Al3+空缺的Al2O3.3中固定单原子Fe-Cl位.
- 催化剂的电子结构和活性位点的表征,使用诸如in-situ X射线发射光谱等技术.
- 在600°C的连续再生条件下,在脱 (PDH) 中催化性能的评估.
主要成果:
- Fe-Cl/Al2O3催化剂显示了Cl和Fe之间增强的电荷转移,导致更高的有效磁矩.
- 在连续再生下实现了250小时的特殊耐用性,具有高烯时空收益率 (1.2 molC3H6 gFe−1 h−1).
- 与Fe/Al2O3.3相比,催化剂抑制了焦炭的形成,并降低了C-H激活的激活能量屏障.
结论:
- 将Fe-Cl固定在Al2O3中的Al3+空缺中,可以协同增强PDH的稳定性和活性.
- 独特的原子分散的Fe-Cl活性结构是提高性能和抑制焦炭形成的原因.
- 增强的电荷转移和可能改变的自旋状态有助于改善脱过程中的催化活性.
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