Mixed oxide with high pore volume
A technology of mixed oxides and oxides, applied in zirconium compounds, chemical/physical processes, metal/metal oxides/metal hydroxide catalysts, etc., can solve problems that do not mention the characteristics of mixed oxides
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[0177] The following examples illustrate the invention.
[0178] particle size
[0179] The d50 was measured with a laser particle size analyzer model LS13320 from Beckman Coulter. Follow the manufacturer's guidelines for using the Fraunhofer model. This distribution is obtained by dispersion of the particles in water in the presence of a dispersant (sodium hexametaphosphate). A relative index of refraction of 1.6 was used.
[0180] Specific surface area (BET)
[0181] The specific surface area was automatically determined on a Macsorb analyzer model I-1220 of Moteng Company. Samples were carefully degassed to remove volatile adsorbed species prior to any measurement. For this, the sample can be heated in an oven at 200°C for 2 hours and then in the chamber of the device at 300°C for 15 minutes.
[0182] Hg porosimetry
[0183] The parameters of porosity were determined by mercury intrusion porosimetry. A McMeritick device Autopore IV 9500 was used following the ...
example 1
[0188] Example 1: Preparation of a mixture based on ceria (40%), zirconia (50%), lanthanum oxide (5%) and yttrium oxide (5%) Synthetic oxides
[0189] Aqueous acidic dispersion S was prepared by mixing:
[0190] - cerium nitrate solution ([CeO 2 ]=258g / L; density 1.442kg / L; at least 90.0mol% Ce IV / C IV +Ce III molar ratio), corresponding to 20 g of CeO 2 ;
[0191] - TZH-40 powder (average particle size = 28.9 μm; % ZrO 2 =43.2% (with ZrO 2 means)), corresponding to 25g of ZrO 2 ;
[0192] - Lanthanum nitrate solution ([La 2 o 3 ]=388.6g / L; density 1.612kg / L), corresponding to 2.5g of La 2 o 3 ;
[0193] -Yttrium nitrate solution ([Y 2 o 3 ]=197.1g / L; density 1.376kg / L), corresponding to Y of 2.5g 2 o 3 ;
[0194] - 55.9 g of 60 wt% nitric acid solution (13.14 mol / L; density 1.38).
[0195] The molar ratio of the dispersion H + / Zr is therefore equal to 2.9. This ratio is based on the following calculations:
[0196] H from cerium nitrate + : 0.05mo...
example 2
[0202] Example 2: Preparation of a mixture based on ceria (50%), zirconia (40%), lanthanum oxide (5%) and yttrium oxide (5%) Synthetic oxides
[0203] Mixed oxides were prepared in the same manner as in Example 1, except that;
[0204] -CeO 2 The amount is 25g instead of 20g;
[0205] -ZrO 2 The amount is 20g instead of 25g;
[0206] - H from cerium nitrate + : 0.06mol;
[0207] - The amount of 60 wt% nitric acid is 37.9 g instead of 55.9 g, so that the dispersion S exhibits a molar ratio H + / Zr=2.6.
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