Method for controlling high dispersion of metal centers for catalysts by using auxiliaries

A catalyst metal, center height technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as difficult removal, affecting catalyst activity, and the role of difficult metal active centers

Active Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the addition of additives is generally done by ordinary impregnation, or controlled by surfactants, etc. The dispersion of additives is low and uneven, and it is difficult to interact with the metal active center well.
Moreover, most of the control agents are organic substances, and the residues directly affect the catalyst activity due to the difficulty of removal.

Method used

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  • Method for controlling high dispersion of metal centers for catalysts by using auxiliaries
  • Method for controlling high dispersion of metal centers for catalysts by using auxiliaries
  • Method for controlling high dispersion of metal centers for catalysts by using auxiliaries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step A: 0.01mol Mg(NO 3 ) 2 ·6H 2 O, 0.0015mol Al(NO 3 ) 3 9H 2 O, 0.001mol SnCl 4 ·6H 2 O. 0.2mol urea was dissolved in 200ml deionized water to prepare a mixed solution, crystallized at 90°C for 12h, the product was filtered and washed to pH 7, dried in an oven at 100°C for 10h, and a small amount of samples were taken for characterization to obtain MgAlSn-LDHs.

[0022] Step B: Weigh 2 g of MgAlSn-LDHs (prepared in Step A), impregnate an equal volume of H 2 [PtCl 6 ]·6H 2 O aqueous solution, oscillated evenly, washed to remove physically adsorbed ions, and dried at 80°C for 12 hours to obtain Pt / MgAlSn-LDHs.

[0023] Step C: heat the obtained Pt / MgAlSn-LDHs in a muffle furnace at 750 °C for 300 min, and after cooling down to room temperature, in a tube furnace for H 2 Reduction, reduction at 750°C for 300 minutes to obtain Pt / MgAlSn-MMO, a small amount of samples were taken for characterization.

Embodiment 2

[0029] Step A: 0.01mol Zn(NO 3 ) 2 ·6H 2 O, 0.0015mol Al(NO 3 ) 3 9H 2 O, 0.001mol SnCl 4 ·6H 2 O. 0.2mol urea was dissolved in 200ml deionized water to prepare a mixed solution, crystallized at 90°C for 12h, the product was filtered and washed to pH 7, dried in an oven at 100°C for 10h, and a small amount of samples were taken for characterization to obtain ZnAlSn-LDHs.

[0030] Step B: Weigh 2g ZnAlSn-LDHs (prepared in step A), impregnate an equal volume of H 2 [PtCl 6 ]·6H 2 O aqueous solution, oscillated evenly, washed to remove physically adsorbed ions, and dried at 80°C for 12 hours to obtain Pt / ZnAlSn-LDHs.

[0031] Step C: heat the obtained Pt / ZnAlSn-LDHs in a muffle furnace at 750 °C for 300 min, and after cooling down to room temperature, heat it in a tube furnace for H 2 Reduction, reduction at 750°C for 300 minutes to obtain Pt / ZnAlSn-MMO, a small amount of samples were taken for characterization.

Embodiment 3

[0037] Step A: 0.01mol Zn(NO 3 ) 2 ·6H 2 O, 0.0015mol Al(NO 3 ) 3 9H 2 O, 0.001mol ZrO(NO 3 ) 2 ·6H 2 O. Dissolve 0.2mol urea in 200ml deionized water to prepare a mixed solution, stir and crystallize at 90°C for 12h, filter and wash the product to pH 7, dry in an oven at 100°C for 10h, take a small amount of samples for characterization, and obtain ZnAlZr-LDHs.

[0038] Step B: Weigh 2g of ZnAlZr-LDHs (prepared in step A), impregnate an equal volume of H 2 [PtCl 6 ] aqueous solution, shake evenly, wash to remove physically adsorbed ions, and dry at 100°C for 12 hours to obtain Pt / ZnAlZr-LDHs.

[0039] Step C: heat the obtained Pt / ZnAlZr-LDHs in a muffle furnace at 750 ° C for 300 min, and after cooling down to room temperature, heat 2 Reduction, reduction at 750°C for 300 minutes to obtain Pt / ZnAlZr-MMO, a small amount of samples were taken for characterization.

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Abstract

The invention relates to a method for controlling high dispersion of metal centers for catalysts by using auxiliaries, belonging to the technical field of supported catalyst controlling. Through uniform dispersion of layered double hydrotalcite precursor layer board cations, uniform doping, namely high dispersion of auxiliary metal ions in roasting oxides is realized, an electronic structure on a carrier surface is modulated, and the anchor points of Pt metal centers are provided. The method is easy to operate and control, the types and the content of the auxiliaries can be adjusted, and a control agent is not needed, so that single-atom-dispersed or atomic cluster Pt metal centers are obtained.

Description

technical field [0001] The invention belongs to the technical field of supported catalyst control, and in particular provides a method for controlling highly dispersed catalyst metal centers. Background technique [0002] Supported metal catalysts are widely used in industry because of their high catalytic activity and selectivity. For supported metal catalysts, the size effect of metal particles is generally an important factor affecting the performance of the catalyst, especially for noble metal catalysts, most of which require highly dispersed active centers due to their high cost and the requirements of the reaction itself. The control of metal active centers depends on additives in many cases. Different from catalyst active centers, additives refer to substances added to catalysts or catalytic systems to increase the rate or selectivity of catalytic reactions. In the absence of a catalyst, the promoter itself has no appreciable catalytic activity. However, additives ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00B01J35/00B01J23/62B01J23/60B01J23/89
Inventor 何静马晓丹安哲
Owner BEIJING UNIV OF CHEM TECH
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