论文名称：Improvement of catalytic activity over Cu-Fe modified Al-rich Beta catalyst for the selective catalytic reduction of NOx with NH3
论文类型：期刊论文
发表刊物：MICROPOROUS AND MESOPOROUS MATERIALS
收录刊物：SCIE、EI、Scopus
卷号：236
页面范围：211-217
ISSN号：1387-1811
关键字：Al-rich Beta; Cu-Fe-Beta; NH3-SCR; Synergistic effect; Sulfur resistance
摘要：Copper and iron bimetal modified Al-rich Beta zeolites from template-free synthesis were prepared for selective catalytic reduction (SCR) of NOX with NH3 in exhaust gas streams. Comparing to the Cu-based and Fe-based mono-component Beta catalysts, Cu(3.0)-Fe(1.3)-Beta bi-component catalyst shows better low-temperature activity and wider reaction-temperature window. Over 80% of NO conversion can be achieved at the temperature region of 125-500 degrees C. Due to the synergistic effect of copper and iron evidenced by XRD, UV-Vis-NIR, EPR and XPS measurements, the dispersion state of active components as well as the ratio of Cu2+/Cu+ and Fe3+/Fe2+ were improved over Cu(3.0)-Fe(1.3)-Beta. Isolated Cu2+ and Fe3+ ions which located at the exchange sites could be the active species at the low-temperature region, while FeOX cluster species may be more important to the high-temperature activity. During the test of sulfur resistance, Fe-containing samples including Cu(3.0)-Fe(1.3)-Beta and Fe(2.7)-Beta-4 present better performance compared to Cu(4.1)-Beta-4. Deactivation of Cu-based catalyst is attributed to the easier deposition of sulfates over the surface according to the results of TGA coupled with TPD experiments. (C) 2016 Elsevier Inc. All rights reserved.
发表时间：2016-12-01