NH3-SCR on Cu, Fe and Cu plus Fe exchanged beta and SSZ-13 catalysts: Hydrothermal aging and propylene poisoning effects

被引：95

作者：

Wang, Aiyong ^{[1
,2
]}

Wang, Yilin ^{[2
]}

Walter, Eric D. ^{[2
]}

Washton, Nancy M. ^{[2
]}

Guo, Yanglong ^{[1
]}

Lu, Guanzhong ^{[1
]}

Peden, Charles H. F. ^{[2
]}

Gao, Feng ^{[2
]}

机构：

[1] East China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China

[2] Pacific Northwest Natl Lab, Inst Integrated Catalysis, POB 999, Richland, WA 99352 USA

来源：

CATALYSIS TODAY | 2019年 / 320卷

基金：

中国国家自然科学基金;

关键词：

NH3-SCR; Cu; Fe; Beta; SSZ-13; NOX REDUCTION; V2O5/TIO2; CATALYST; SCR CATALYSTS; ACTIVE-SITES; ZEOLITE; DEACTIVATION; PERFORMANCE; KINETICS; NH3; DECOMPOSITION;

D O I：

10.1016/j.cattod.2017.09.061

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Cu, Fe and Cu + Fe ion exchanged Beta and SSZ-13 catalysts were prepared by solution ion exchange using commercial NH4/Beta, and NH4/SSZ-13 that was prepared in-house. To study hydrothermal aging effects, Beta supported catalysts were aged hydrothermally at 700 degrees C and SSZ-13 supported catalysts were aged at 750 degrees C. In order to reveal the effects of Fe addition in the co-exchanged catalysts, these catalysts were characterized by means of powder X-ray diffraction (XRD), N2 adsorption-desorption, electron paramagnetic resonance (EPR), Al-27-nuclear magnetic resonance (Al-27-NMR) and propylene coking followed with temperature programmed reaction (TPR), and further tested with standard NH3-SCR with and without the presence of propylene. Collectively, the catalyst characterizations and reaction testing indicated minor beneficial effects of Fe addition in Cu, Fe/Beta, where NH3-SCR activity, N-2 selectivity and hydrothermal stability were all slightly improved. In contrast, Fe addition did not show apparent beneficial effects in low-temperature SCR for the Cu, Fe/SSZ-13 case. At elevated reaction temperatures, however, the presence of Fe indeed considerably improved NO conversion and N-2 selectivity for the hydrothermally aged Cu, Fe/SSZ-13 catalyst in the presence of propylene.

引用

页码：91 / 99

页数：9

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