Associate Professor Ikegami Ikegami of the University of Kumamoto in Japan developed the substance "Ln2O2SO4" that can absorb and release a large amount of oxygen. Can significantly reduce the amount of precious metals used for automotive exhaust gas purification.
Oxygen-adsorbing substances are widely used in automotive exhaust gas purification to automatically control the partial pressure of oxygen in the exhaust gas with a three-way catalyst. However, the existing CeO2-ZrO2 (CeO2)-type oxygen-absorbing material (CeO2-ZrO2) has the problem of releasing high-concentration H2S after adsorption of SO2, and it is difficult to significantly increase the amount of oxygen adsorbed on the structure of the adsorbed material.
The oxygen adsorption amount of the yttrium oxide is 0.25 mol/mol or less, and the rare earth oxide sulfate can reach 2 mol/mol, and the adsorption amount is 8 times that of the former. Moreover, the adsorption rate was also twice that of cerium oxide. It was verified that the material can support a wider range of engine operating modes, and has sufficient speed, SOx resistance, and particulate combustion activity in exhaust gas purification.
At present, it is recognized in the industry that Pr (ruthenium) has the fastest reduction rate and oxidation rate among rare earth elements, and it can work under low temperature conditions. However, using Pr has the risk of resource shortage. The University of Kumamoto intends to develop Clack's value (a ratio of the proportion of elements contained in the crust) in the future, and to replace Pr with La(镧)-Ce(铈) complexes rich in rare earth elements. May exceed the performance of the Pr class. In addition, this development is funded by the New Energy Industry Technology Development Agency (NEDO).
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