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Catalysts 2019, 9(3), 247; https://doi.org/10.3390/catal9030247

Investigation of Various Pd Species in Pd/BEA for Cold Start Application

1
Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
2
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
3
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
4
Wuxi Weifu Lida Catalytic Converter Co., Ltd., Wuxi 214028, China
*
Author to whom correspondence should be addressed.
Received: 16 February 2019 / Revised: 2 March 2019 / Accepted: 4 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Emissions Control Catalysis)
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Abstract

A series of Pd/BEA catalysts with various Pd loadings were synthesized. Two active Pd2+ species, Z-Pd2+-Z and Z-Pd(OH)+, on exchanged sites of zeolites, were identified by in situ FTIR using CO and NH3 respectively. Higher NOx storage capacity of Z-Pd2+-Z was demonstrated compared with that of Z-Pd(OH)+, which was caused by the different resistance to H2O. Besides, lower Pd loading led to a sharp decline of Z-Pd(OH)+, which was attributed to the ‘exchange preference’ for Z-Pd2+-Z in BEA. Based on this research, the atom utilization of Pd can be improved by decreasing Pd loading. View Full-Text
Keywords: Pd/BEA; Cold start; Pd species; NOx abatement Pd/BEA; Cold start; Pd species; NOx abatement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, B.; Shen, M.; Wang, J.; Wang, J.; Wang, J. Investigation of Various Pd Species in Pd/BEA for Cold Start Application. Catalysts 2019, 9, 247.

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