Linking hydrothermal deactivation of Cu-CHA catalysts for NH ₃ -SCR to dealumination and reduced [Cu ₂ (NH ₃ ) ₄ O ₂ ] ²⁺ formation

Shivangi Singh; Ton V. W. Janssens; Henrik Grönbeck

doi:10.1039/d5cy01491c

January 1, 2026Catalysis Science & TechnologyOpen Access

Linking hydrothermal deactivation of Cu-CHA catalysts for NH ₃ -SCR to dealumination and reduced [Cu ₂ (NH ₃ ) ₄ O ₂ ] ²⁺ formation

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Key Points

Investigate the relationship between the hydrothermal deactivation of Cu-CHA catalysts and their performance in NH3-SCR.
Analysis of Cu-CHA catalysts under various hydrothermal conditions
Evaluation of dealumination effects on catalyst structure
Measurement of NOx reduction efficiency in reaction setup
Hydrothermal treatment significantly reduces catalytic activity in NH3-SCR
Dealumination correlates with structural changes in Cu-CHA catalysts
Formation of reduced Cu2(NH3)4O2 complexes affects catalytic efficiency

Implication

Demonstrates hydrothermal deactivation reduces catalyst performance in NH3-SCR, indicating significant implications for NOx control.

Abstract

NH3-Selective Catalytic Reduction (NH3-SCR) is a critical technology for control of NOx emissions from diesel and H2 engines. Cu-exchanged chabazite (Cu-CHA) materials are preferred catalysts for the NH3-SCR reaction thanks...

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Cite This Study

Singh et al. (2026) studied this question.

synapsesocial.com/papers/69acc59c32b0ef16a4050130 https://doi.org/10.1039/d5cy01491c

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Linking hydrothermal deactivation of Cu-CHA catalysts for NH ₃ -SCR to dealumination and reduced [Cu ₂ (NH ₃ ) ₄ O ₂ ] ²⁺ formation

Key Points

Implication

Abstract

Discussion

Cite This Study

Linking hydrothermal deactivation of Cu-CHA catalysts for NH ₃ -SCR to dealumination and reduced [Cu ₂ (NH ₃ ) ₄ O ₂ ] ²⁺ formation

Key Points

Implication

Abstract

Discussion

Cite This Study

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