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| Experimental Study on Effects of Hydrothermal Aging on the Performance of Three-Way Catalytic Converter for a Natural Gas Engine |
| DOI：10.13949/j.cnki.nrjgc.2024.04.007 |
| Key Words:three-way catalyst（TWC） aging temperature water vapor content physical and chemical properties microstructure |
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| Abstract:Hydrothermal aging test of catalyst samples was carried out with hydrothermal aging test device， and the variational laws in the ignition performance of the catalysts before and after hydrothermal aging were analyzed. The effects of aging temperatures and atmospheres （water content） on catalyst activities， surface chemical states and microstructures were studied by X-ray photoelectron spectroscopy （XPS）， X-ray diffraction （XRD）， N2 physical adsorption and transmission electron microscopy （TEM）. The results show that the aging temperature has a great influence on the physicochemical properties of the catalyst. With the increase of aging temperature， the oxygen vacancy content of the catalyst decreases， the oxygen storage capacity decreases， the particle size of the auxiliary agent increases， the specific surface area decreases， the pore size increases， and the activity of the catalyst decreases. The change of water content in the aging atmosphere has little influence on the physicochemical properties of the catalyst. When the water content is 10%， the activity of the catalyst is the highest， the oxygen storage capacity of the catalyst is relatively high， and the specific surface area is the largest， which indicates that the appropriate hydrothermal aging is conducive to the improvement of catalyst performance. |
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