A γ-FeO-modified nanoflower-MnO/attapulgite catalyst for low temperature SCR of NO with NH

• Published in: New journal of chemistry 2019-02, Vol.43 (6), p.249-25
• Main Authors: Xie, Aijuan, Tao, Yiyang, Jin, Xiang, Gu, Pengfei, Huang, Xiaoyan, Zhou, Xingmeng, Luo, Shiping, Yao, Chao, Li, Xiazhang
• Format: Article
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c8nj04524k

A mesoporous γ-Fe 2 O 3 -modified nanoflower-MnO 2 /attapulgite (γ-Fe 2 O 3 /nf-MnO 2 -ATP) catalyst was fabricated through a facile hydrothermal method. The results of TEM and XRD indicated that γ-Fe 2 O 3 /nf-MnO 2 -ATP presented a beautiful nanoflower shape and good dispersion. The BET results showed that the specific surface area and pore volume of γ-Fe 2 O 3 /nf-MnO 2 -ATP significantly increased after surface modification with γ-Fe 2 O 3 . Also, the XPS and NH 3 -TPD results illustrated that the γ-Fe 2 O 3 coating could enhance the amounts of surface chemisorbed oxygen and acidic sites. SO 2 and H 2 O tolerance tests and stability tests demonstrated that γ-Fe 2 O 3 /nf-MnO 2 -ATP can effectively inhibit SO 2 and H 2 O poisoning and improve the stability of the catalyst. The superior SCR performance can be attributed to the abundant acid sites, the strong adsorption of NO x , and the formation of more oxygen vacancies as well as metal-metal interactions. Therefore, γ-Fe 2 O 3 /nf-MnO 2 -ATP was proved to be an excellent catalyst for NH 3 -SCR and may be of interest in other environmental catalysis applications. A novel mesoporous γ-Fe 2 O 3 -modified nanoflower-MnO 2 /attapulgite catalyst has been fabricated through a facile hydrothermal method and used for low temperature SCR of NO x with NH 3 .