Study of Ce, Sb, and Y exchanged titania nanotubes and superior catalytic performance for the selective catalytic reduction of NOx

被引：35
|
作者：
Damma, Devaiah [1 ]
Pappas, Dimitrios K. [1 ]
Boningari, Thirupathi [1 ]
Smirniotis, Panagiotis G. [1 ]
机构：
[1] Univ Cincinnati, Coll Engn & Appl Sci, Chem Engn, Cincinnati, OH 45221 USA
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 287卷
关键词：
Nitrogen oxides (NOx); Titania nanotubes; Manganese oxide (MnOx); NH3-SCR; Thermal stability; LOW-TEMPERATURE SCR; THERMAL-STABILITY; SULFUR RESISTANCE; CARBON NANOTUBES; SUPPORTED MNOX; TIO2; NH3; SURFACE; OXIDES; CERIA;
D O I：
10.1016/j.apcatb.2021.119939
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Metal exchanged titania nanotube (M-TNT, M = Ce, Sb, and Y) materials were used as supports to prepare manganese confined (Mn/M-TNT) catalysts for the NH3-SCR. All the fresh catalysts showed similar deNO(x) performance with great NOx conversion in the temperature range of 100 350 degrees C. However, after thermal aging, the NH3-SCR activity of Mn/Ce-TNT and Mn/Sb-TNT catalysts has dramatically decreased. Interestingly, the Mn/ Y-TNT catalyst maintained well its good NH3-SCR activity even after thermal aging at 650 degrees C. The tubular morphology and surface area/pore volume are reasonably maintained even after thermal aging at 650 degrees C when TNT exchanged with Y. The loss of active MnO2 (Mn4+) species, active oxygen species, and acid sites on the surface of the Mn/Y-TNT catalyst is significantly prevented during thermal treatment, therefore NH3-SCR activity is well preserved over the thermally aged Mn/Y-TNT catalysts.
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页数：18
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