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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
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  • Abstract
  • Description
  • Claims
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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 increases, Pd ions will be released from Ce 1-x PD x o 2-δ Precipitated in the crystal lattice and formed metal Pd on the surface, indicating that Pd doped ceria (CeO 2 ) has the problem of poor stability

Method used

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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
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Ce 0.7 mn 0.3 Rh 0.02 o 2-x preparation of

[0020] S1) Weigh 75mmol (9.454g) of oxalic acid dihydrate and pour it into a 200mL beaker, add 75mL of deionized water, and stir at a speed of 800rpm for 10 minutes to form a clear aqueous solution of oxalic acid;

[0021] S2) take by weighing 7mmol (3.040g) cerium nitrate hexahydrate and 3mmol (0.7352g) manganese acetate tetrahydrate and 0.2mmol (0.0527g) rhodium chloride trihydrate in a 100mL beaker, add 75mL deionized water, Stir for 10 minutes at a speed of 800rpm to form a clear metal salt solution;

[0022] S3) Pour the metal salt solution into the oxalic acid solution, stir at 800rpm for 6 hours, and then stand at 50°C for 12h;

[0023] S4) After separating the above solution, washing with deionized water, drying at 80° C. for 12 hours;

[0024] S5) The dried sample was heated to 500°C at a heating rate of 2°C / min in air atmosphere and kept for 4 hours to obtain Ce 0.7 mn 0.3 Rh 0.02 o 2-x catalyst...

Embodiment 2

[0025] Example 2: Ce 0.7 Fe 0.3 Rh 0.02 o 2-x preparation of

[0026] S1) Weigh 75 mmol (9.454 g) of oxalic acid dihydrate and pour it into a 200 mL beaker, add 75 mL of deionized water, and stir at a speed of 800 rpm for 20 minutes to form a clear aqueous oxalic acid 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 a speed of 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 800rpm for 4 hours, and then stand at 60°C for 18h;

[0029] S4) After separating the above solution, washing with deionized water, drying at 100° C. for 24 hours;

[0030] S5) The dried sample was heated to 400°C at a heating rate of 5°C / min in the air atmosphere and kept for 6 hours to obtain Ce 0.7 Fe 0.3 Rh 0.02 o 2-...

Embodiment 3

[0031] Example 3: Ce 0.7 Cr 0.3 PD 0.02 o 2-x preparation of

[0032] S1) Weigh 150mmol oxalic acid (19.100g) and pour it into a 200ml beaker, add 75mL deionized water, and stir at 800rpm for 10 minutes to form a 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, and stir at a speed of 800rpm 10 minutes, a clear metal salt solution was formed;

[0034] S3) Pour the metal salt solution into the oxalic acid solution, stir at 800rpm for 4 hours, and then stand at 40°C for 12h;

[0035] S4) After separating the above solution, washing with deionized water, drying at 100° C. for 24 hours;

[0036]S5) The dried sample was heated to 400°C at a heating rate of 4°C / min in the air atmosphere and kept for 6 hours to obtain Ce 0.7 Cr 0.3 PD 0.02 o 2-x catalyst.

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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.

Description

technical field [0001] The invention belongs to the field of environmental catalysis and nanoscience, and relates to a double-metal co-doped cerium oxide with a porous structure that can be used in various catalysis fields, and specifically includes a preparation method of the catalyst. Background technique [0002] With the development of industry and the rapid popularization of motor vehicles, industrial waste gas and tail gas emissions have become the main factors of environmental degradation. How to efficiently convert industrial waste gas and tail gas emissions has become the focus of human attention. Among them, efficient catalysts have become a current research hotspot. [0003] Ceria (CeO 2 ) as a resource-rich and cheap rare earth oxide with fluorite structure has been widely used in various fields such as catalysis, fuel cells and biomaterials. It has abundant oxygen vacancies and active sites for acid-base reactions, excellent Ce 3+ / C 4+ Due to their reversibl...

Claims

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Application Information

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IPC IPC(8): B01J23/652B01J23/656B01J23/89B01J35/10
CPCB01J23/6562B01J23/894B01J23/6522B01J2523/00B01J35/61B01J2523/3712B01J2523/72B01J2523/822B01J2523/842B01J2523/67B01J2523/824
Inventor 黄秀兵张凯悦王鹏
Owner UNIV OF SCI & TECH BEIJING
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