The development of carbon monoxide oxidation catalysts for complex gas environments faces significant challenges in fire scenarios. Only a few representative gases are used as interfering components in simulated real smoke under laboratory conditions, which cannot accurately reflect the performance of catalysts in a real fire. Herein, Au/CeO catalysts with high activity were prepared by adjusting the morphology (rod, cube, polyhedron and irregular particles) and exposed crystal surface ratio of CeO. Rod-like Au/CeO (Au/CeO-NR) achieved 99 % CO conversion at 25 °C and demonstrated excellent water resistance. This excellent activity originates from the high oxygen vacancy concentration of the CeO-NR and the interaction between Au species and the carrier. A testbed was established by connecting a steady-state tube furnace with a catalytic fixed-bed reactor to evaluate the CO elimination performance of the catalyst under realistic combustion conditions. Despite competitive adsorption of small molecules (HO, acetone, etc.) on the active sites, Au/CeO-NR eliminates carbon monoxide in real combustion atmospheres at only 60 °C. This study provides a method for evaluating the catalytic activity of CO in realistic environments, which is promising for practical use in application scenarios dealing with toxic fumes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2025.137182 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Optimizing low-temperature CO oxidation under realistic combustion conditions: The impact of CeO morphology on Au/CeO catalysts.
J Hazard Mater
January 2025
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China; Suzhou Key Laboratory for Urban Public Safety, Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu 215123, PR China. Electronic address:
The development of carbon monoxide oxidation catalysts for complex gas environments faces significant challenges in fire scenarios. Only a few representative gases are used as interfering components in simulated real smoke under laboratory conditions, which cannot accurately reflect the performance of catalysts in a real fire. Herein, Au/CeO catalysts with high activity were prepared by adjusting the morphology (rod, cube, polyhedron and irregular particles) and exposed crystal surface ratio of CeO.
View Article and Find Full Text PDFPurification and Value-Added Conversion of NO under Ambient Conditions with Photo-/Electrocatalysis Technology.
Environ Sci Technol
January 2025
Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
As primary air pollutants from fossil fuel combustion, the excess emission of nitric oxides (NO) results in a series of atmospheric environmental issues. Although the selective catalytic reduction technology has been confirmed to be effective for NO removal, green purification and value-added conversion of NO under ambient conditions are still facing great challenges, especially for nitrogen resource recovery. To address that, photo-/electrocatalysis technology offers sustainable routes for efficient NO purification and upcycling under ambient temperature and pressure, which has received considerable attention from scientific communities.
View Article and Find Full Text PDFAdvances and Challenges in Speciation Measurement and Microkinetic Modeling for Gas-Solid Heterogeneous Catalysis.
J Phys Chem A
January 2025
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
Microkinetic modeling of heterogeneous catalysis serves as an efficient tool bridging atom-scale first-principles calculations and macroscale industrial reactor simulations. Fundamental understanding of the microkinetic mechanism relies on a combination of experimental and theoretical studies. This Perspective presents an overview of the latest progress of experimental and microkinetic modeling approaches applied to gas-solid catalytic kinetics.
View Article and Find Full Text PDFEngineered Porosity ZnO Sensor Enriched with Oxygen Vacancies Enabled Extraordinary Sub-ppm Sensing of Hydrogen Sulfide and Nitrogen Dioxide Air Pollution Gases at Low Temperature in Air.
Sensors (Basel)
November 2024
Department of Materials Science, Institute for Experimental Condensed Matter Physics, Heinrich Heine University of Düsseldorf, 40225 Düsseldorf, Germany.
We report the results of a zinc oxide (ZnO) low-power microsensor for sub-ppm detection of NO and HS in air at 200 °C. NO emission is predominantly produced by the combustion processes of fossil fuels, while coal-fired power plants are the main emitter of HS. Fossil fuels (oil, natural gas, and coal) combined contained 74% of USA energy production in 2023.
View Article and Find Full Text PDFUnintended side effect of the coal-to-gas policy in North China Plain: Migration of the sources and health risks of ambient PAHs.
Sci Total Environ
January 2025
Department of Atmospheric Sciences, School of Environmental Sciences, China University of Geosciences, Wuhan 430074, China. Electronic address:
Ongoing coal-to-gas (CTG) largely cut down both coal consumption and associated PM. However, a knowledge gap still existed in CTG impacts on the other energy and organic pollutant emissions. Coupling on-site investigation with statistical yearbooks, we provided a more realistic energy evolutions before (BCTG), during (DCTG), and after (ACTG) the CTG for Hebei Province.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!