Review of Core-shell structure zeolite-based catalysts for NOx emission control

Lingfeng Jia; Jixing Liu; Huifang Cheng; Zhen Zhao; Jian Liu

doi:10.1016/j.jes.2023.10.012

Review of Core-shell structure zeolite-based catalysts for NO_x emission control

J Environ Sci (China). 2025 Apr:150:451-465. doi: 10.1016/j.jes.2023.10.012. Epub 2023 Oct 20.

Authors

Lingfeng Jia¹, Jixing Liu², Huifang Cheng³, Zhen Zhao¹, Jian Liu⁴

Affiliations

¹ State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
² School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, China. Electronic address: jxliu0804@ujs.edu.cn.
³ School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, China.
⁴ State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China; Laboratory of Heavy Oil at Karamay, China University of Petroleum-Beijing at Karamay, Karamay 834000, China. Electronic address: liujian@cup.edu.cn.

PMID: 39306420
DOI: 10.1016/j.jes.2023.10.012

Abstract

Nitrogen oxides (NO_x) from diesel engine exhaust, is one of the major sources of environmental pollution. Currently, selective catalytic reduction with ammonia (NH₃-SCR) is considered to be the most effective protocol for reducing NO_x emissions. Nowadays, zeolite-based NH₃-SCR catalysts have been industrialized and widespread used in this field. Nevertheless, with the increasingly stringent environmental regulations and implementation of the requirement of "zero emission" of diesel engine exhaust, it is extremely urgent to prepare catalysts with superior NH₃-SCR activity and exceptional resistance to poisons (SO₂, alkali metals, hydrocarbons, etc.). Core-shell structure zeolite-based catalysts (CSCs) have shown great promise in NH₃-SCR of NO_x in recent years by virtue of its relatively higher low-temperature activity, broader operation temperature window and outstanding resistance to poisons. This review mainly focuses on the recent progress of CSCs for NH₃-SCR of NO_x with three extensively investigated SSZ-13, ZSM-5, Beta zeolites as cores. The reaction mechanisms of resistance to sulfur poisoning, alkali metal poisoning, hydrocarbon poisoning, and hydrothermal aging are summarized. Moreover, the important role of interfacial effect between core and shell in the reaction of NH₃-SCR was clarified. Finally, the future development and application outlook of CSCs are prospected.

Keywords: Core-shell structure; Interfacial effects; NH(3)-SCR; Resistance; Zeolite.

Publication types

Review

MeSH terms

Air Pollutants* / chemistry
Air Pollution / prevention & control
Ammonia / chemistry
Catalysis
Nitrogen Oxides* / chemistry
Vehicle Emissions* / analysis
Zeolites* / chemistry

Substances

Zeolites
Nitrogen Oxides
Air Pollutants
Vehicle Emissions
Ammonia