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Method for preparing catalyst used for modulating distribution of metal on molecular sieve

A molecular sieve and catalyst technology, which is applied in the field of catalyst preparation for modulating the spatial distribution of metal nanoparticles on a molecular sieve carrier

Active Publication Date: 2016-06-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of technology to precisely control the spatial deposition sites of metal nanoparticles on molecular sieves, and further research is urgently needed

Method used

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  • Method for preparing catalyst used for modulating distribution of metal on molecular sieve
  • Method for preparing catalyst used for modulating distribution of metal on molecular sieve
  • Method for preparing catalyst used for modulating distribution of metal on molecular sieve

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] On the one hand, a method for preparing a catalyst that modulates the distribution of metals on molecular sieves, the specific steps are as follows:

[0041] (1) pre-mixing the pore blocking agent with the molecular sieve I to obtain the molecular sieve II filled with the pore blocking agent molecules in the channels;

[0042](2) mixing and stirring the metal precursor solution and the molecular sieve II to obtain a mixed solution I;

[0043] (3) Adjust the pH value of the mixed solution I to be less than or equal to the isoelectric point of the element at the deposition position on the molecular sieve I, then age, centrifuge, and dry to obtain the catalyst A.

[0044] In catalyst A, the pores of molecular sieve I have been blocked by plugging agent molecules. After the metal precursor solution is mixed with molecular sieve II, the metal species will preferentially contact and react with the molecular sieve at the pores, making the pores blocked and Au species difficult...

Embodiment 1

[0075] Deposition of Au nanoparticles on specific Ti sites on the outer surface of molecular sieves

[0076] Take 0.5g of titanium silicon molecular sieve TS-1 containing tetraethylammonium hydroxide and place it in a beaker, add 40g of water and stir for 10 minutes, then add 10mL of 0.1mol / L chloroauric acid solution to form mixed solution I; mix solution I Stirring at room temperature for 30 minutes and maintaining the pH at 7, centrifuging the obtained mixed solution, washing, and drying to obtain a catalyst in which Au nanoparticles are only deposited near the Ti site on the outer surface of the titanium-silicon molecular sieve TS-1.

[0077] Carry out N 2 Physical adsorption, as shown in Table 1. Compared with the micropore volume of Au / TS-1, the micropore volume of the pure carrier TS-1 is almost unchanged, and both are small, indicating that the template agent blocks the micropore channels, and the Au nanoparticles are only deposited outside the molecular sieve. surfa...

Embodiment 2

[0080] Deposition of Au nanoparticles on specific Ti sites on the outer surface of molecular sieves

[0081] Take 0.5g of titanium-silicon molecular sieve TS-1 containing no pore-blocking agent in the micropores and place it in a beaker, add 40g of water at 60°C and stir for 100 minutes, then add 10mL of 0.1mol / L chloroauric acid solution to form a mixed solution I ; The mixed solution I was stirred at room temperature for 50 minutes and the pH was maintained at 7, the mixed solution was centrifuged, the solid was taken out, washed and dried to obtain a catalyst in which Au nanoparticles were only deposited near the Ti site on the outer surface of the titanium-silicon molecular sieve TS-1 .

[0082] Carrying out N on TiSi molecular sieve TS-1 and Au / TS-1 catalysts without pore-blocking agent in the micropores 2Physical adsorption, as shown in Table 1. Although the micropore volume of the pure carrier TS-1 is larger than that of Au / TS-1, it hardly changes, indicating that the...

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Abstract

Provided is a method for preparing a catalyst used for modulating distribution of metal on a molecular sieve.By control over the blockage of molecular sieve ducts and the pH of solution, or by selection of metal complexes of appropriate sizes and adjustment of deposition-precipitation process parameters and the pH of solution, catalytic activity metal elements can be selectively deposited on specific loci of the outer surface of the molecular sieve or deposited on specific loci of the inner surface of the molecular sieve as a priority.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing a catalyst, in particular to a method for preparing a catalyst for modulating the spatial distribution of metal nanoparticles on a molecular sieve carrier. Background technique [0002] 90% of the processes in the modern chemical industry are realized under the action of catalysts, among which supported metal catalysts are the most widely used type of catalysts. Among many factors affecting the performance of supported metal catalysts, the interaction between the metal and the support is an important factor determining the performance of the catalyst. It can affect the dispersion behavior and interaction mode of the metal active components on the carrier, thereby chemically modulating the metal active components and ultimately affecting the catalytic performance. [0003] As an important class of catalytic materials, zeolite molecular sieves cover many important l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/04B01J37/02B01J29/89
CPCB01J29/89B01J37/0203B01J37/0207B01J37/04B01J2229/183
Inventor 冯翔宋钊宁杨朝合刘熠斌陈小博巩家成杨瑞毛小倩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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