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通过对Fe-ZSM-5催化剂中La的注来提高催化湿过氧化物的H₂O₂利用效率

Weiling Piao¹, Wenjing Sun¹, Danyang Yu¹

¹Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, People's Republic of China.

Environmental science and pollution research international

|September 25, 2023

概括

添加兰的铁氧化物 (Fe-La-ZSM-5) 在催化湿氧化氧化过程中显著提高过氧化的效率,用于降解有机污染物. 这种增强的催化剂提供了更大的稳定性和减少金属漏,用于实际的废水处理.

科学领域:

环境化学环境化学
催化剂是一种催化剂.
材料科学材料科学材料科学

背景情况:

带铁的化物 (Fe-zeolites) 是有效的催化剂,可以在温和条件下通过催化湿过氧化物氧化 (CWPO) 来降解高度的有机污染物.
优化过氧化 (H2O2) 使用效率和催化剂稳定性对于实际的CWPO应用至关重要.

研究的目的:

研究兰 (La) 兴奋剂对Fe-ZSM-5催化剂的影响,以提高CWPO中的H2O2利用率和催化性能.
为了比较Fe-ZSM-5和Fe-La-ZSM-5催化剂的催化活性,稳定性和污染物降解效率.

主要方法:

两步浸方法合成0.4重%的La-化1.0重%的Fe-ZSM-5催化剂.
在55°C下使用Fe-ZSM-5和Fe-La-ZSM-5对m-cresol (1000 mg/L) 进行催化湿过氧化 (CWPO).
包括TEM-EDS,FT-IR,NH3-TPD,拉曼光谱和H2-TPR在内的表征技术用于分析催化剂特性.

主要成果:

与Fe-ZSM-5相比,Fe-La-ZSM-5的H2O2利用效率比Fe-ZSM-5高15%,并且有类似的总有机碳 (TOC) 除去 (~40%).
兰兴奋剂减少了15%的金属漏,提高了催化剂的稳定性,在10天内保持了90%以上的转化.
描述显示了表面酸度的变化,更均的Fe物种分散,并促进了Fe-La-ZSM-5的可还原性,促进了H2O2分解成活性基的过程.

结论:

兰兴奋剂显著提高了有机污染物CWPO的Fe-ZSM-5催化剂的性能和稳定性.
改善的催化活性归因于增强的H2O2分解成基激素,由改变的表面特性和Fe物种驱动.
Fe-La-ZSM-5在实际和高效的废水处理应用中显示出相当大的潜力.

关键词:

催化湿过氧化物氧化催化剂.在Fe-La-ZSM-5催化剂中.在H2O2利用效率方面,使用效率很高.这就是M-cresol.污水处理污水处理污水处理

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