Gas-sensing material with noble metal doped composite metal oxide and its production
A technology of noble metal oxides and composite metals, applied in the direction of material resistance, etc., can solve the problems of complicated operation steps, unsatisfactory sensitivity and selectivity, etc., and achieve the effects of controllable reaction conditions, improved sensitivity and selectivity, and good dispersion performance
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[0020] Example 1
[0021] Preparation of noble metal-added composite metal oxide gas-sensing material
[0022] Accurately weigh 1.488g Zn(NO 3 ) 2 ·6H 2 O, 7.014g SnCl 4 ·5H 2 O and 0.0577g PdCl 2 Dissolve in 500mL deionized water to prepare a mixed salt solution. Under strong stirring at 400 rpm, slowly add a dilute ammonia solution with a concentration of about 12% to the above mixed solution until the pH value is 8.0 to form a precipitation precursor. Leave to age for 24hr, filter and wash thoroughly until there is almost no Cl in the filtrate - And NO 3 -, The resulting precipitate was dried at 100°C for 5 hours and calcined in an air atmosphere at 600°C for 6 hours, where the heating rate was 3°C / min to obtain PdO x -ZnO-SnO 2 Composite metal oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:4, and the mass percentage of Pd in the composite oxide is 1%. From the TEM ( figure 1 ) It can be seen that the average particle size is about 35nm, and the specific surface of th...
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[0023] Example 2
[0024] PdCl 2 The added amount of was changed to 0.1163g, and the others were the same as in Example 1. PdO was prepared x -ZnO-SnO 2 Composite oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:4, and the mass percentage of Pd in the composite oxide is 2%. The average particle size of the composite material is about 25nm, and the specific surface area is 110.0m 2 / g.
Example Embodiment
[0025] Example 3
[0026] Change the amount of ZnO added to 2.976g, PdCl 2 The added amount was changed to 0.1595g, and the others were the same as in Example 1. PdO was prepared x -ZnO-SnO 2 Composite oxide powder, where Zn 2+ / Sn 4+ The molar ratio is 1:2, and the mass percentage of Pd in the composite oxide is 4%. The average particle size of the composite material is about 50nm, and the specific surface is 45.6m 2 / g.
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