Method for preparing stable 6-hydroxyl platinum (IV) acid diethanolamine water solution

A technology of aqueous solution and ethanolamine, which is applied in the field of chemical catalysis, can solve problems such as difficulty in loading, reduction of dispersion and adhesion of active ingredients, and inapplicability

Inactive Publication Date: 2014-06-18
KUNMING INST OF PRECIOUS METALS
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AI Technical Summary

Problems solved by technology

[0005] (2) Pt(NO 3 ) 2 It is very unstable and must be prepared and used immediately, and excessive nitric acid is required. The obtained impregnating solution has strong acidity, which will dissolve the surface of the carrier material, destroy the original surface structure, and reduce the active ingredient on the carrier surface. Dispersion and adhesion, affecting catalytic performance [K Paul, C M Marten.langmuir, 1999,15,4508-4512; JVakros, K Bourikas, Ch Kordulis.J.Phys.Chem.,B,2003,107,1804- 1813]
[0006] (3) Use chloride or nitrate as a precursor to release toxic gases such as HCl and Cl during the production process of the catalyst 2 , NOx, which is not conducive to clean production
Chinese patents CN200810058248.8 and CN201310037275.8 reported two novel water-soluble halogen-free catalytic precursors [Pt(NH 3 ) 4 ]C 2 o 4 ,[Pt(NH 3 ) 4 ](CH 2 COO) 2 , but this type of precursor provides complex cations during chemical impregnation, and it is difficult to load the carrier with an electropositive surface, so it is not applicable

Method used

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  • Method for preparing stable 6-hydroxyl platinum (IV) acid diethanolamine water solution

Examples

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Effect test

Embodiment 1a

[0011] Example 1a: Intermediate H 2 Pt(OH) 6 preparation of

[0012] Take commercially available K 2 PtCl 6 48.6g (0.1mol) in 1000mL water, stir well, add 500mL aqueous solution containing 67.2g (1.2mol) of potassium hydroxide, heat to boil until the color of the solution turns light yellow-green, cool to room temperature, adjust the pH of the solution with acetic acid =5.0, a large amount of pale yellow precipitate H was precipitated 2 Pt(OH) 6 , collected by filtration, washed with water until no Cl was detected - Dry at 60°C to obtain 29.1 g of light yellow solid powder with a yield of 97.0%.

[0013] Structural determination data: Elemental analysis: Pt64.9%, H2.75% is consistent with the theoretical value (Pt65.2%H2.70%), in line with H 2 Pt(OH) 6 Structure.

[0014] b:(HOCH 2 CH 2 NH 3 ) 2 [Pt(OH) 6 ] for the preparation of an aqueous solution

[0015] Take 15.0 g (50.17 mmol) H 2 Pt(OH) 6 , add 100mL of 6.20% ethanolamine aqueous solution (equivalent to...

Embodiment 2

[0019] a: Intermediate H 2 Pt(OH) 6 preparation of

[0020] Take commercially available Na 2 PtCl 6 Dissolve 90.8g (0.2mol) in 1200mL water, add 800mL aqueous solution containing 96g (2.4mol) sodium hydroxide, heat to boil until the color of the solution turns light yellow-green, cool to room temperature, adjust the pH of the reaction solution to 4.0 with nitric acid, and precipitate A large amount of pale yellow precipitate H 2 Pt(OH) 6 , collected by filtration, washed with water until no Cl was detected - Dry at 60° C. to obtain 58.7 g of light yellow solid powder with a yield of 98.0%.

[0021] Structure determination data: Elemental analysis: Pt64.7%, H2.79% are consistent with theoretical values ​​(Pt65.2%H2.69%). Complies with H 2 Pt(OH) 6 Structure.

[0022] b: product (HOCH 2 CH 2 NH 3 ) 2 [Pt(OH) 6 ] preparation

[0023]Take 45 g (150.5 mmol) H 2 Pt(OH) 6 , add 100mL of 18.5% ethanolamine aqueous solution (equivalent to 303mmol), heat to dissolve, a...

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Abstract

The invention relates to a method for preparing a stable water solution of a compound 6-hydroxyl platinum (IV) acid diethanolamine (HOCH2CH2NH3)2[Pt(OH)6] of a precursor of a platinized catalyst. The method comprises following steps of (1) adding NaOH or KOH into a starting material N2PtCl6(N=H,Na,K), after completely substituting for chloridion by hydroxyl, regulating pH to be 4.0-5.5 with nitric acid or acetic acid so as to obtain light yellow H2Pt(OH)6 precipitate; (2) dissolving the precipitate into certain concentration of ethanol amine water solution so as to obtain the stable (HOCH2CH2NH3)2[Pt(OH)6] water solution with 95-200mg/mL Pt and pH of 8.5-10.0. The yield reaches over 95%.

Description

technical field [0001] Hexahydroxyplatinum (IV) acid bis(ethanolamine) is a complex of tetravalent platinum, the molecular formula is (HOCH 2 CH 2 NH 3 ) 2 [Pt(OH) 6 ], which is mainly used as a new precursor for the preparation of platinum-supported catalysts in the form of aqueous solution. The present invention relates to stable (HOCH 2 CH 2 NH 3 ) 2 [Pt(OH) 6 ] A kind of preparation technology of aqueous solution, belongs to chemical catalysis field. Background technique [0002] Platinum-supported catalysts are widely used in various fields such as petrochemical, pharmaceutical and chemical industries, the purification of toxic and harmful gases, especially the purification of motor vehicle exhaust, and the carrier materials used are mainly oxides of aluminum, silicon, titanium, and activated carbon. The chemical impregnation method is the mainstream method for industrial preparation of this type of catalyst. The key process is water-phase loading (that is, pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F15/00B01J23/42
Inventor 余娟叶青松刘伟平常桥稳晏彩先姜婧
Owner KUNMING INST OF PRECIOUS METALS
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