Correlation between zeolitic particle size and the low-temperature NOx storage capacity of Pd/ZSM-11 passive NOx adsorber

Yu, Qingjun; Cheng, Haodan; Pan, Rouxing; Li, Zhenguo; Yi, Honghong; Gao, Feifei; Zhang, Jie; Yao, Yuan; Tang, Xiaolong

doi:10.1016/j.jssc.2023.124189

Cited by 1 publication

(3 citation statements)

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“…Hydrothermal aging can increase the migration rate of PdO within the zeolite, leading to the redistribution and formation of Pd 2+ ionic species in SSZ-13, which enhances the NO adsorption capacity. However, this approach can degrade the zeolite framework to a certain extent. , It has been widely acknowledged that improving Pd dispersion in Pd/zeolites boosts their NO x storage capacity, making the study of methods to enhance Pd dispersion in zeolites crucial. , …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…24,25 It has been widely acknowledged that improving Pd dispersion in Pd/zeolites boosts their NO x storage capacity, making the study of methods to enhance Pd dispersion in zeolites crucial. 26,27 In this study, Pd/SSZ-13 samples with similar theoretical loadings were prepared using incipient wetness impregnation and quantitative ion-exchange methods. This was done to examine how different preparation techniques impact the lowtemperature cold-start NO x passive adsorption performance of Pd-loaded small-pore zeolites.…”

Section: Introductionmentioning

confidence: 99%

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Achieving High Dispersion of Pd in Small-Pore Zeolite SSZ-13: A High-Efficiency Low-Temperature NOx Adsorber

Liu,

Li,

Shao

et al. 2024

ACS Omega

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Passive NO x adsorber (PNA) materials are primarily considered for reducing nitrogen oxide emissions during the low-temperature cold start of a motor vehicle. Pd/SSZ-13 has attracted considerable attention because of its outstanding hydrothermal stability and sulfur resistance. Optimizing the dispersion of precious metal Pd in Pd/SSZ-13 is crucial for enhancing PNA performance and nitrogen oxide adsorption capability. In this study, we prepared Pd/SSZ-13 using different methods and evaluated their influence on the NO x adsorption capability. The characterization results show that the dispersion of precious metal Pd in the Pd/SSZ-13 catalyst prepared by the quantitative ionexchange method is as high as 92.13%, and the loading amount is as high as 98.93%. Pd predominantly exists as Pd 2+ , achieving near-total loading and further improving the catalyst's NO x adsorption capacity. This study offers innovative approaches and methods for applying Pd/SSZ-13 as a PNA material, serving as a reference for its further optimization and performance enhancement. Continued research into the preparation and adsorption performance of Pd/SSZ-13 materials could offer solutions to reduce motor vehicle nitrogen oxide emissions.

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