Sulfur poisoning and regeneration of NOx storage-reduction Cu/K2Ti2O5 Catalyst

Qiang Wang, Jiahua Zhu, Suying Wei, Jong Shik Chung, Zhanhu Guo

科研成果: 期刊稿件文章同行评审

14 引用 (Scopus)

摘要

A new Cu/K2Ti2O5 catalyst has been developed recently to remove NOx through the NOx storage-reduction (NSR) process. However, its NSR performance in the presence of sulfur has not been investigated. In this article, the sulfur poisoning of the NOx storage-reduction catalyst Cu/K2Ti2O 5 and the corresponding deactivation mechanisms are reported for the first time. The effect of the sulfur concentration, adsorption/regeneration cycling tests, and temperature-programmed regeneration are studied. At low temperatures, the poisoning effect is negligible when the SO2 concentration is lower than 20 ppm, and the sulfated samples can be easily regenerated by 3.5% H2 at 550 °C. However, at high temperatures, the sulfur species are adsorbed on K+ sites to form K 2SO4 and, consequently, induce a structure transformation from K2Ti2O5 to K2Ti 6O13 nanoparticles. The structural change is reversible, and the sulfated catalyst can be regenerated by hydrogen at 650-700 °C.

源语言英语
页(从-至)7330-7335
页数6
期刊Industrial and Engineering Chemistry Research
49
16
DOI
出版状态已出版 - 18 8月 2010
已对外发布

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