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Related Experiment Video

Updated: Feb 5, 2026

Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems

Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems

Published on: November 18, 2015

Hydrothermal Stability of CeO

Jingjing Liu^1,2, Xiaoyan Shi^1,2, Yulong Shan^1,2

¹State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China.

Environmental Science & Technology

|September 13, 2018

Summary

This study shows CeO2-WO3-ZrO2 mixed oxides maintain excellent selective catalytic reduction (SCR) activity for nitrogen oxides (NOx) removal even after harsh hydrothermal aging. The catalyst demonstrates remarkable stability and efficiency in high-temperature conditions.

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Area of Science:

Materials Science
Environmental Chemistry
Catalysis

Background:

Selective catalytic reduction (SCR) using ammonia (NH3) is crucial for removing nitrogen oxides (NOx) from industrial emissions.
Developing catalysts with high activity and hydrothermal stability is essential for effective NOx abatement.

Purpose of the Study:

To investigate the impact of hydrothermal aging on the performance of CeO2-WO3-ZrO2 mixed oxide catalysts for NH3-SCR.
To understand the structural and chemical changes affecting the catalyst's stability and activity.

Main Methods:

Homogeneous precipitation method for catalyst synthesis.
Hydrothermal aging at 850 °C for 16 hours.
Characterization using N2-physisorption, XRD, Raman, H2-TPR, XPS, NH3-TPD, and in situ DRIFTS.

Main Results:

The CeO2-WO3-ZrO2 catalyst exhibited excellent NH3-SCR activity and hydrothermal stability.
After aging, surface area decreased by 89% and NH3 storage capacity by 71%, with new phase formation.
The aged catalyst maintained 80% NOx conversion at 300-500 °C under high space velocity (250,000 h-1).

Conclusions:

The CeO2-WO3-ZrO2 catalyst demonstrates superior hydrothermal stability for NOx removal.
Catalyst activity is attributed to retained redox-acid sites and their interaction, facilitated by Ce-Zr solid solutions and Ce4W9O33 formation.