Noble metal catalyst and its preparation method and application
A noble metal catalyst, noble metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc. Problems such as detachment and catalytic performance degradation, etc., achieve the effects of easy industrial application, high market promotion prospects, and low cost
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[0076] The preparation method of the noble metal catalyst of the present embodiment comprises the following steps:
[0077] ABOs 3 Preparation steps: mix the salt of A with the salt or ester of B, process according to the sol-gel method or hydrothermal method, and optionally load it on a carrier to obtain ABO 3 material or ABO supported on carrier 3 Material;
[0078] ABOs 3-Z Preparation steps: the obtained ABO 3 The material is reduced and calcined to obtain ABO 3-z Material;
[0079] Precious metal N rivet steps: the acid solution or salt solution of precious metal N and ABO 3-z The suspension is mixed, and the precious metal N rivets are added to the ABO by co-precipitation method 3-z , followed by drying and reduction calcination to obtain N / ABO 3-z noble metal catalysts.
[0080] ABOs 3 preparation steps
[0081] In this step, the salt of A and the salt or ester of B are mixed in the solvent according to the molar ratio of A and B of about 1:1, and then synt...
Embodiment 1
[0150] The structure of the noble metal catalyst of the present embodiment is N / A 1-x B 1-y o 3-z , where N is Au, A is Sr, B is Ti, x=0, y=0, z=0.01, specifically: Au / SrTiO 3-z .
[0151] Specific steps are as follows:
[0152] (1) Synthesis of SrTiO by hydrothermal method 3
[0153] Stir strontium nitrate and tetrabutyl titanate in 200mL ethylene glycol (EG) solution at a ratio of 1:1 (0.1mol), keep the temperature of the water bath at 80°C, and the solution becomes dry as the ethylene glycol evaporates Glue was added to 300 mL of NaOH solution with a concentration of 5 mol / L and stirred for 20 min. Then, the mixed solution was transferred to a 50mL hydrothermal kettle, and placed in an oven to heat at 200°C for 24h, and then washed with deionized water until the pH of the solution was 8, thereby preparing SrTiO 3 . The resulting SrTiO 3 It is ready for use after drying and grinding.
[0154] (2) Synthesis of SrTiO by hydrogen etching 3-z
[0155]The SrTiO prepar...
Embodiment 2
[0161] Except that the temperature of reduction calcination in step (2) in Example 1 was changed from 300 °C to 650 °C, the catalyst Au / SrTiO was prepared in the same steps as in Example 1 3-z , where x=0.07.
[0162] And, the CO catalytic activity was tested in the same manner as in Example 1, and the result was: the conversion rate to CO was 100% at 130°C.
[0163] In addition, the catalyst in embodiment 1 and embodiment 2 has been carried out EPR test, and the result is shown in figure 1 middle. It is obvious from the EPR diagram that the SrTiO 3-z After the catalyst was calcined at 300°C in a hydrogen-argon atmosphere, a small amount of oxygen vacancies formed, while at 650°C, a large number of oxygen vacancies formed. Therefore, the catalytic activity of the catalyst of Example 2 is better than that of the catalyst of Example 1.
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