High stability cerium zirconium composite oxide and preparation method and application thereof
A composite oxide and oxide technology, applied in chemical instruments and methods, separation methods, combustion methods, etc., can solve the problems of unstable internal structure, collapse and sintering of crystal grains, achieve excellent anti-aging performance, and improve high temperature stability. the effect of improving catalytic performance
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Embodiment 1
[0072] The cerium-zirconium composite oxide is composed of 25% cerium oxide, 67.5% zirconia, 3.5% lanthanum oxide, and 4% yttrium oxide in terms of mass percentage.
[0073] The preparation method of the present embodiment cerium-zirconium composite oxide is as follows:
[0074] 1) In the first beaker, add 1000ml deionized water, add 38.58g cerium ammonium nitrate, 103.85g zirconium nitrate, 4.65g lanthanum nitrate, 6.78g yttrium nitrate into the first beaker, heat to 50°C and stir for 1 -2h, dissolve the raw materials until the solution is clear, and dilute to 2500ml with deionized water.
[0075] 2) In the second beaker, add 1000ml of pure water, 230ml of ammonia water, the concentration of ammonia water is 12mol / L, then add 25g of lauric acid, stir at room temperature until the lauric acid is completely dissolved and clear, and set the volume to 2500ml.
[0076] 3) Under stirring conditions, transfer the solution in the first beaker to the second beaker with a peristaltic ...
Embodiment 2
[0083] The cerium-zirconium composite oxide is composed of 40% cerium oxide, 50% zirconia, 4% lanthanum oxide, 2% yttrium oxide, and 4% neodymium oxide in terms of mass percentage.
[0084] The preparation method of the present embodiment cerium-zirconium composite oxide is as follows
[0085] 1) In the first beaker, add 1000ml deionized water, add 61.72g cerium ammonium nitrate, 77.16g zirconium nitrate, 5.32g lanthanum nitrate, 3.39g yttrium nitrate, 5.21g neodymium nitrate to the first beaker, heat Stir at 50°C for 1-2h, dissolve the raw materials until the solution is clear, and dilute to 2500ml with deionized water.
[0086] 2) In the second beaker, add 1000ml of pure water, 230ml of ammonia water, the concentration of ammonia water is 12mol / L, then add 25g of lauric acid, stir at room temperature until the lauric acid is completely dissolved and clear, and set the volume to 2500ml.
[0087] 3) Under stirring conditions, transfer the solution in the first beaker to the s...
experiment example 1
[0120] The physical and chemical indicators of the above samples were tested respectively, and the results are shown in Table 1.
[0121] Table 1 Basic physical and chemical indicators of catalysts
[0122]
[0123] From the data in Table 1, it can be seen that
[0124] (1) Pure ceria has very few oxygen vacancies and has extremely poor anti-aging ability;
[0125] (2) Adding sodium hydroxide can improve the anti-aging performance of cerium-zirconium composite oxide and increase oxygen vacancies;
[0126] (3) As the addition of sodium hydroxide increases, the lattice constant decreases, and the shrinkage rate of the unit cell increases with oxygen vacancies, indicating that the degree of lattice deformity deepens, but the anti-aging ability of the catalyst decreases;
[0127] (4) The final evaluation of the catalyst is the final catalytic performance of the cerium-zirconium composite oxide, which is the result of the combined effect of oxygen vacancies and aging specific ...
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