TY - JOUR
T1 - Insight into hydrothermal aging effect on deactivation of Pd/SSZ-13 as low-temperature NO adsorption catalyst: Effect of dealumination and Pd mobility
AU - Zhao, Huawang
AU - Chen, Xiaoyin
AU - Bhat, Adarsh
AU - Li, Yongdan
AU - Schwank, Johannes W.
PY - 2021/6/5
Y1 - 2021/6/5
N2 - Pd/SSZ-13 samples with the same Pd loading (1 wt.%) but different Si/Al ratio (6 and 13) were hydrothermally aged at 800, 850, and 900 ºC, respectively. The Pd/SSZ-13 with a lower Si/Al ratio suffers a more severe deactivation. The Pd/SSZ-13 with a Si/Al ratio of 6 experiences structural damage due to dealumination, while the structure of the sample with a Si/Al ratio of 13 remains intact. The agglomeration of Pd
2+ ions to large PdO particles on the external surface of zeolite causes the deactivation. The Pd cations are mobile during aging. Besides dealumination, the Pd
2+ ions might be hydrolyzed and have a high mobility, which also results in the Pd
2+ ions agglomeration. The severe dealumination causes the deactivation after aging at 900 ºC. However, the Pd mobility might be the primary reason for the decline of NO adsorption capacity of Pd/SSZ-13 after aging at 800 and 850 °C.
AB - Pd/SSZ-13 samples with the same Pd loading (1 wt.%) but different Si/Al ratio (6 and 13) were hydrothermally aged at 800, 850, and 900 ºC, respectively. The Pd/SSZ-13 with a lower Si/Al ratio suffers a more severe deactivation. The Pd/SSZ-13 with a Si/Al ratio of 6 experiences structural damage due to dealumination, while the structure of the sample with a Si/Al ratio of 13 remains intact. The agglomeration of Pd
2+ ions to large PdO particles on the external surface of zeolite causes the deactivation. The Pd cations are mobile during aging. Besides dealumination, the Pd
2+ ions might be hydrolyzed and have a high mobility, which also results in the Pd
2+ ions agglomeration. The severe dealumination causes the deactivation after aging at 900 ºC. However, the Pd mobility might be the primary reason for the decline of NO adsorption capacity of Pd/SSZ-13 after aging at 800 and 850 °C.
KW - low-temperature NO adsorption
KW - Pd/SSZ-13
KW - hyhdrothermal aging
KW - dealumination
KW - Pd mobility
UR - http://www.scopus.com/inward/record.url?scp=85099392837&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2020.119874
DO - 10.1016/j.apcatb.2020.119874
M3 - Article
VL - 286
JO - APPLIED CATALYSIS B-ENVIRONMENTAL
JF - APPLIED CATALYSIS B-ENVIRONMENTAL
SN - 0926-3373
M1 - 119874
ER -