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The preparation method of water-soluble palladium nitrate

A palladium nitrate, water-soluble technology, applied in the field of catalysis, can solve the problems of affecting the loading and dispersion of active component palladium, low water solubility of nitrate compounds, corroding the shell of a purifier, etc., to simplify transportation procedures, save transportation costs, and save The effect of production costs

Active Publication Date: 2017-03-15
KUNMING GUIYI METAL MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the production process, it is also found that the use of such nitrate precursors also has some disadvantages and shortcomings: 1) The water solubility of nitrate compounds is very small, and it needs to be dissolved with nitric acid
Therefore, the impregnation solution has a strong acidity, which will dissolve the surface of the carrier material (γ-Al2O3) and the modified material (rare earth oxide), destroy the original structure of their surface, and affect the loading and dispersion of the active ingredient palladium ;2) Dried roasting after impregnation or through H 2 The reduction process will produce nitrogen oxides, which will pollute the environment and is not conducive to clean production; 3) The undecomposed nitrate will form nitric acid during the operation of the car through the action of water vapor, which will corrode the shell of the purifier

Method used

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  • The preparation method of water-soluble palladium nitrate
  • The preparation method of water-soluble palladium nitrate
  • The preparation method of water-soluble palladium nitrate

Examples

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Effect test

Embodiment 1

[0035] A kind of preparation method of water-soluble palladium nitrate, comprises the steps:

[0036] Step (1), after mixing aqua regia and equal volume of water evenly, add the raw material palladium to it, the solid-liquid ratio is 0.9:3, keep boiling for 2 hours, filter, and take the filtrate;

[0037] Step (2), adding ammonia water to the filtrate obtained in step (1) until the pH value is 8, then performing hydrolysis for 8 minutes, filtering, and washing the filter residue with hot water at 40°C until the pH is 7 to obtain palladium material;

[0038] Step (3), add the palladium material obtained in step (2) into concentrated nitric acid and record the total volume. The solid-to-liquid ratio of palladium material to concentrated nitric acid is 1:2.4, and the mass of palladium material to be dissolved is 1 / 1 of the total mass. At 3 o'clock, add the dilute nitric acid that massfraction is 50% to original total volume, then be heated to constant boiling, until palladium mat...

Embodiment 2

[0042] A kind of preparation method of water-soluble palladium nitrate, comprises the steps:

[0043] Step (1), after mixing aqua regia and equal volume of water evenly, add the raw material palladium to it, the solid-liquid ratio is 1.1:3, keep boiling for 3 hours, filter, and take the filtrate;

[0044] Step (2), adding ammonia water to the filtrate obtained in step (1) until the pH value is 8, then performing hydrolysis for 12 minutes, filtering, washing the filter residue with hot water at 70°C until the pH is 7, and obtaining palladium material;

[0045] Step (3), add the palladium material obtained in step (2) into concentrated nitric acid and record the total volume. The solid-to-liquid ratio of palladium material to concentrated nitric acid is 1:2.6, and the mass of palladium material to be dissolved is 1 / 1 of the total mass. At 3 o'clock, add the dilute nitric acid that massfraction is 50% to original total volume, then be heated to constant boiling, until palladium m...

Embodiment 3

[0049] A kind of preparation method of water-soluble palladium nitrate, comprises the steps:

[0050] Step (1), after mixing aqua regia and equal volume of water evenly, add the raw material palladium to it, the solid-liquid ratio is 1:3, keep boiling for 2.5h, filter, and take the filtrate;

[0051] Step (2), adding ammonia water to the filtrate obtained in step (1) until the pH value is 8, then performing hydrolysis for 10 minutes, filtering, washing the filter residue with hot water at 60°C until the pH is 7, and obtaining palladium material;

[0052] Step (3), add the palladium material obtained in step (2) into the concentrated nitric acid and record the total volume. The solid-liquid ratio of the palladium material to the concentrated nitric acid is 1:2.5, and the mass of the palladium material to be dissolved is 1 / 2 of the total mass. At 3 o'clock, add the dilute nitric acid that massfraction is 50% to original total volume, then be heated to constant boiling, until pal...

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Abstract

The invention relates to a preparation method of water-soluble palladium nitrate and belongs to the technical field of catalysis. By means of the method, Pd(NO3)2.nH2O can be prepared in batches, wherein the content of palladium in the Pd(NO3)2.nH2O crystal can reach 41%. The Pd(NO3)2.nH2O product is good in water solubility and an aqueous solution thereof is not less than eight hours. The reparation method is safe and reliable. The Pd(NO3)2.nH2O crystal product is stable in performances and is good in uniformity, and can satisfy a requirement of catalyst precursors. The preparation method changes a situation that the Pd(NO3)2.nH2O crystal in the prior art does not have water solubility and is difficult to use, can simplify transportation procedure and save transportation cost, reduces loss of palladium and acid, can reduce emission of waste gas and is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of water-soluble palladium nitrate. Background technique [0002] With the rapid development of my country's economy, noble metal functional material catalysts are widely used in industry. Especially the automotive industry. Since the 1970s, a large number of functional material catalysts for automobile exhaust purification have been popularized and used, and soon developed into the largest functional material catalysts in China. As a "noble cluster catalyst" among domestic noble metal functional material catalysts, palladium nitrate is mainly used as one of the coating formulations on the carrier of automobile exhaust gas purification catalysts. The annual demand for palladium nitrate in the automobile exhaust purifying agent market is about 70-120 tons / year, which is equivalent to 30-50 tons / year for metal palladium. 20%~30% of the gross ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/25C01G55/00
Inventor 李雄郑恩华黄言生许思勇向明才
Owner KUNMING GUIYI METAL MATERIAL
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