文献类型：期刊文献

英文题名：NH3-SCR on Cu, Fe and Cu + Fe exchanged beta and SSZ-13 catalysts: Hydrothermal aging and propylene poisoning effects

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] Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, China; [2] Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, United States

年份：2019

卷号：320

起止页码：91

外文期刊名：Catalysis Today

收录：EI(收录号：20174104263247)

语种：英文

外文关键词：X ray diffraction - Nuclear magnetic resonance - Propylene - Temperature programmed desorption - Catalyst selectivity - Catalyst supports - Catalyst poisoning - Electron spin resonance spectroscopy - Ion exchange - Paramagnetic resonance

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 °C and SSZ-13 supported catalysts were aged at 750 °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), 27Al-nuclear magnetic resonance (27Al-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, N2 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 N2 selectivity for the hydrothermally aged Cu,Fe/SSZ-13 catalyst in the presence of propylene. ? 2017