Effects of Si/Al Ratio on Passive NOx Adsorption Performance over Pd/Beta Zeolites

Huang, Shasha; Wang, Qiang; Shan, Yulong; Shi, Xiaoyan; Liu, Zhongqi; He, Hong

doi:10.3390/molecules28083501

Open AccessArticle

Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites

by

Shasha Huang

^1,2

,

Qiang Wang

^1,2,*,

Yulong Shan

^3,4,*,

Xiaoyan Shi

^3,4,

Zhongqi Liu

^3,4 and

Hong He

^3,4,5

¹

Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

²

Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

³

State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

⁴

University of Chinese Academy of Sciences, Beijing 100049, China

⁵

Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China

^*

Authors to whom correspondence should be addressed.

Molecules 2023, 28(8), 3501; https://doi.org/10.3390/molecules28083501

Submission received: 21 March 2023 / Revised: 7 April 2023 / Accepted: 13 April 2023 / Published: 16 April 2023

(This article belongs to the Special Issue Environmental Functional Materials and CO₂ Storage Materials)

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Abstract

In the current article, the effect of Si/Al ratio on the NO_x adsorption and storage capacity over Pd/Beta with 1 wt% Pd loading was investigated. The XRD, ²⁷Al NMR and ²⁹Si NMR measurements were used to determine the structure of Pd/Beta zeolites. XAFS, XPS, CO-DRIFT, TEM and H₂-TPR were used to identify the Pd species. The results showed that the NO_x adsorption and storage capacity on Pd/Beta zeolites gradually decreased with the increase of Si/Al ratio. Pd/Beta-Si (Si-rich, Si/Al~260) rarely has NO_x adsorption and storage capacity, while Pd/Beta-Al (Al-rich, Si/Al~6) and Pd/Beta-C (Common, Si/Al~25) exhibit excellent NO_x adsorption and storage capacity and suitable desorption temperature. Pd/Beta-C has slightly lower desorption temperature compared to Pd/Beta-Al. The NO_x adsorption and storage capacity increased for Pd/Beta-Al and Pd/Beta-C by hydrothermal aging treatment, while the NO_x adsorption and storage capacity on Pd/Beta-Si had no change.

Keywords: diesel exhaust; passive NO_x adsorber; Pd; Beta; Si/Al ratio

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MDPI and ACS Style

Huang, S.; Wang, Q.; Shan, Y.; Shi, X.; Liu, Z.; He, H. Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites. Molecules 2023, 28, 3501. https://doi.org/10.3390/molecules28083501

AMA Style

Huang S, Wang Q, Shan Y, Shi X, Liu Z, He H. Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites. Molecules. 2023; 28(8):3501. https://doi.org/10.3390/molecules28083501

Chicago/Turabian Style

Huang, Shasha, Qiang Wang, Yulong Shan, Xiaoyan Shi, Zhongqi Liu, and Hong He. 2023. "Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites" Molecules 28, no. 8: 3501. https://doi.org/10.3390/molecules28083501

APA Style

Huang, S., Wang, Q., Shan, Y., Shi, X., Liu, Z., & He, H. (2023). Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites. Molecules, 28(8), 3501. https://doi.org/10.3390/molecules28083501

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Effects of Si/Al Ratio on Passive NO_x Adsorption Performance over Pd/Beta Zeolites

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