1. Preparation and characterization of super-microporous alumina with crystalline structure.
- Author
-
Li, Yongfeng, Su, Jiaojiao, and Li, Ruifeng
- Subjects
- *
ALUMINUM oxide , *CRYSTAL structure , *POROUS materials , *SURFACE area , *MOLECULAR self-assembly , *SURFACE active agents - Abstract
Super-microporous alumina (pore size between 1 and 2 nm) with polycrystalline walls and high surface area (more than 650 m 2 /g) was synthesized successfully via an evaporation induced self-assembly (EISA) pathway using readily available and inexpensive nonionic surfactant fatty alcohol polyoxyethylene ether (AEO-7) as the template. N 2 adsorption-desorption results showed that the obtained materials are super-microporous when removing the template at 400 °C, then if the calcination temperature increase from 600 °C to 1000 °C, a breakdown of the walls separating adjacent pores allows the transformation to mesopores (pore size > 2 nm). FTIR pyridine adsorption and NH 3 -TPD measurement suggested the presence of strong Lewis acid sites. Transmission electron microscopy (TEM) measurements indicated that the alumina possesses the disordered “wormhole-like” super-microporous structure with polycrystalline walls. Loaded with copper, the catalyst exhibited outstanding activity in the selective catalytic reduction of NO with methane and could achieve a NO x conversion 100% when the reaction temperature is over 600 °C. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF