Preparation method of bimetallic co-doped cerium dioxide catalyst with porous structure

A technology of ceria and porous structure, applied in the field of double metal co-doped ceria, the catalyst preparation field, can solve the problems of poor stability, achieve good stability, enrich oxygen vacancies and defects, and improve catalytic activity Effect

Inactive Publication Date: 2021-01-05
UNIV OF SCI & TECH BEIJING
6 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

For example, palladium (Pd) element, experimental results show that as the doping amount of palladium (Pd) increases, the reduction temperature of the oxide can drop below 200 ° C, but as the heating time i...
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Abstract

The invention relates to a preparation method of bimetallic co-doped cerium dioxide catalyst with porous structure, which comprises the following steps: dissolving a cerium (Ce) element, transition metal elements (V, Ti, Cr, Mn, Fe, Co, Ni, Cu and the like) and soluble salts (nitrate, acetate or chlorate) of noble metal elements (Rh, Pd, Au, Ru and the like) into an aqueous solution, adding the solution into an oxalic acid or ammonium oxalate solution, and carrying out coprecipitation to obtain a multi-component precipitate; and roasting in air to obtain the bi-metal co-doped cerium dioxide multi-component composite metal oxide catalyst. The uniform mixing and precipitation of various metal ions are realized through an oxalic acid coprecipitation method which is simple and convenient to operate, and the preparation method is simple and can be used for mass production; the bimetallic co-doped cerium dioxide catalyst with the porous structure has the characteristics of more variable valence metal ions, higher specific surface area, excellent reversible oxygen storage and release capability, synergistic effect among metal ions and the like, and has wide application prospect in the field of heterogeneous catalysis.

Application Domain

Heterogenous catalyst chemical elementsMetal/metal-oxides/metal-hydroxide catalysts

Technology Topic

OXALIC ACID DIHYDRATEAqueous solution +10

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  • Preparation method of bimetallic co-doped cerium dioxide catalyst with porous structure
  • Preparation method of bimetallic co-doped cerium dioxide catalyst with porous structure
  • Preparation method of bimetallic co-doped cerium dioxide catalyst with porous structure

Examples

  • Experimental program(3)

Example Embodiment

[0019] Example 1: Ce 0.7 Mn 0.3 Rh 0.02 O 2-x preparation
[0020] S1) take by weighing 75mmol (9.454g) oxalic acid dihydrate and pour it into the beaker of 200mL, add 75mL deionized water, stir 10 minutes with the rotating speed of 800rpm, form clear oxalic acid aqueous solution;
[0021] S2) take by weighing the cerium nitrate hexahydrate of 7mmol (3.040g) and the manganese acetate tetrahydrate of 3mmol (0.7352g) and the rhodium chloride trihydrate of 0.2mmol (0.0527g) in the beaker of 100mL, add 75mL deionized water, Stir at 800rpm for 10 minutes to form a clear metal salt solution;
[0022] S3) Pour the metal salt solution into the oxalic acid solution, stir at 800 rpm for 6 hours, and then stand at 50°C for 12 hours;
[0023] S4) after the above solution is separated, washed with deionized water, and dried at 80° C. for 12 hours;
[0024] S5) The dried sample is heated to 500°C at a heating rate of 2°C/min in an air atmosphere and kept for 4 hours to obtain Ce 0.7 Mn 0.3 Rh 0.02 O 2-x catalyst.

Example Embodiment

[0025] Example 2: Ce 0.7 Fe 0.3 Rh 0.02 O 2-x preparation
[0026] S1) take by weighing 75mmol (9.454g) oxalic acid dihydrate and pour it into the beaker of 200mL, add 75mL deionized water, stir 20 minutes with the rotating speed of 800rpm, form clear oxalic acid aqueous solution;
[0027] S2) Weigh 7mmol (3.040g) of cerium nitrate hexahydrate and 3mmol (0.8342g) of ferrous sulfate heptahydrate and 0.2mmol (0.0527g) of rhodium chloride trihydrate in a 100mL beaker, add 75mL of deionized water , stirred at 800rpm for 10 minutes to form a clear metal salt solution;
[0028] S3) Pour the metal salt solution into the oxalic acid solution, stir at 800 rpm for 4 hours, and then stand at 60°C for 18 hours;
[0029] S4) after the above solution is separated, washed with deionized water, and dried at 100° C. for 24 hours;
[0030] S5) The dried sample is heated to 400°C at a heating rate of 5°C/min in an air atmosphere and kept for 6 hours to obtain Ce 0.7 Fe 0.3 Rh 0.02 O 2-x catalyst.

Example Embodiment

[0031] Example 3: Ce 0.7 Cr 0.3 Pd 0.02 O 2-x preparation
[0032] S1) take by weighing 150mmol oxalic acid (19.100g) and pour it into the beaker of 200ml, add 75mL deionized water, stir 10 minutes with the rotating speed of 800rpm, form clear oxalic acid aqueous solution;
[0033] S2) Weigh 14mmol (6.0791g) of cerium nitrate hexahydrate and 6mmol (2.4009g) of chromium nitrate nonahydrate and 0.4mmol (0.090g) of palladium acetate in a 100ml beaker, add 75mL of water, stir with a rotating speed of 800rpm 10 minutes to form a clear metal salt solution;
[0034] S3) Pour the metal salt solution into the oxalic acid solution, stir at 800 rpm for 4 hours, and then stand at 40°C for 12 hours;
[0035] S4) after the above solution is separated, washed with deionized water, and dried at 100° C. for 24 hours;
[0036]S5) The dried sample is heated to 400°C at a heating rate of 4°C/min in an air atmosphere and kept for 6 hours to obtain Ce 0.7 Cr 0.3 Pd 0.02 O 2-x catalyst.

PUM

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