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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Related Experiment Video

Updated: Sep 2, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Supported Mn₂O₃-based catalysts for NO-SCO: an experimental study.

Jialin Qiang¹, Hui Li¹, Shien Hui¹

¹State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Rd., Xi'an, 710049, China.

Environmental Science and Pollution Research International

|August 6, 2022

Summary

Ce-doped Mnx/Al catalysts significantly enhance selective catalytic oxidation of NO (NO-SCO) at lower temperatures. The optimized Mn0.2Ce0.08/Al catalyst achieved 83.5% NO conversion, showing improved activity and stability.

Keywords:

Catalytic mechanisms Ce doping Mn2O3 Mnx/Al catalyst NO-SCO

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Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area

Published on: February 19, 2018

Area of Science:

Materials Science
Catalysis
Environmental Chemistry

Background:

Selective catalytic oxidation of nitric oxide (NO-SCO) is crucial for environmental remediation.
Manganese oxides and alumina-supported catalysts are investigated for NO oxidation.
Understanding the role of doping and support interactions is key to catalyst design.

Purpose of the Study:

To synthesize and characterize single-phase Mn2O3, supported Mn2O3/Al2O3, and Ce-doped MnxCe/Al catalysts.
To evaluate the catalytic activity and stability of these materials for NO-SCO.
To investigate the effects of Ce doping and operating parameters on catalyst performance.

Main Methods:

Catalyst synthesis and characterization using XRD, BET, XPS, SEM, O2-TPD, and H2-TPR.
Activity testing for NO-SCO under various conditions.
Density Functional Theory (DFT) calculations for reaction mechanism analysis.

Main Results:

Mn2O3 catalyst showed 78.2% NO conversion at 300°C.
Loading Mn2O3 on Al2O3 decreased activity, shifting the optimal temperature higher.
Ce doping enhanced Mn dispersion, increased surface adsorbed oxygen (Oα), and improved low-temperature activity, with Mn0.2Ce0.08/Al achieving 83.5% NO conversion at 290°C.
Optimized catalyst demonstrated good stability, water, and sulfur resistance.
DFT calculations suggested different reaction mechanisms (ER vs. LH-MvK hybrid) on different surfaces.

Conclusions:

Ce doping is effective in enhancing the low-temperature activity and oxygen mobility of Mn/Al catalysts for NO-SCO.
The Mn0.2Ce0.08/Al catalyst exhibits superior performance and stability.
Further research is needed to fully elucidate the catalytic mechanisms of Ce-doped catalysts.