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Synthetic method for mesoporous foamed silica-loaded precious metal nanometer catalyst

A technology of nano-catalyst and synthesis method, which is applied in the field of synthesis of mesoporous foamed silica-supported noble metal nano-catalyst, which can solve the problems of poor catalyst stability, aggregation and growth, etc., and achieve good stability, simple operation and low pollution.

Inactive Publication Date: 2017-02-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of noble metal nanoparticles is closely related to the synthesis method. Most of the noble metal nanoparticles prepared by traditional synthesis methods are loaded on the surface and in the pores of the carrier. During the calcination or catalytic reaction process, it is easy to cause the aggregation and growth of noble metal nanoparticles, and the stability of the catalyst is relatively low. Difference

Method used

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  • Synthetic method for mesoporous foamed silica-loaded precious metal nanometer catalyst
  • Synthetic method for mesoporous foamed silica-loaded precious metal nanometer catalyst
  • Synthetic method for mesoporous foamed silica-loaded precious metal nanometer catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Dissolve 2g of P123 in 32ml of deionized water and 5ml of concentrated hydrochloric acid solution, and stir at room temperature for 2 hours until clear. Slowly drop 2 g of 1,3,5-TMB into the solution and stir for 2 hours until the solution is clear. Then, 4.6 g of TEOS and 0.3 g of 3-mercaptopropyltrimethoxysilane (MPTMS) were added dropwise and stirred evenly. Then add 4ml of 0.02mol / L tetrachloroauric acid solution, and stir at 38°C for 24 hours. The resulting mixture was transferred to a crystallization kettle and placed in an oven at 100°C for crystallization for 24 hours. After the reaction, it was taken out, cooled, filtered with suction, washed, and dried to obtain a powdery solid. The white powdery solid was calcined at 550° C. for 6 hours in an air atmosphere. The reduction of the catalyst is to reduce at 500°C for 1h under a hydrogen atmosphere to obtain Au / M-SiO 2 catalyst. Depend on figure 1 N in 2 The adsorption-desorption isotherm and pore...

Embodiment 2

[0023] Example 2: Dissolve 2g of P123 in 32ml of deionized water and 5ml of concentrated hydrochloric acid solution, and stir at room temperature for 2 hours until clear. Slowly drop 2.8g of 1,3,5-TMB into the solution, and stir for 2 hours until the solution is clear. Then 4.6 g of TEOS and 0.32 g of 3-mercaptopropyltrimethoxysilane (MPTMS) were added dropwise and stirred evenly. Then, 2 ml of 0.02 mol / L tetrachloroauric acid solution and 2 ml of 0.02 mol / L chloroplatinic acid solution were added successively, and stirred at 38° C. for 24 hours. The resulting mixture was transferred to a crystallization kettle and placed in an oven at 110°C for crystallization for 24 hours. After the reaction, it was taken out, cooled, filtered with suction, washed, and dried to obtain a powdery solid. The white powdery solid was calcined at 500° C. for 8 hours in an air atmosphere. The reduction of the catalyst is to reduce at 500°C for 2h under a hydrogen atmosphere to obtain Au-Pt / M-SiO ...

Embodiment 3

[0024] Example 3: Dissolve 2g of P123 in 32ml of deionized water and 5ml of concentrated hydrochloric acid solution, and stir at room temperature for 2 hours until clear. Slowly drop 2.5g of 1,3,5-TMB into the solution and stir for 2 hours until the solution is clear. Then 4.6 g of TEOS and 0.35 g of 3-mercaptopropyltrimethoxysilane (MPTMS) were added dropwise and stirred evenly. Then 2ml of 0.02mol / L tetrachloroauric acid solution and 7ml of 0.01mol / L palladium chloride solution were added successively, and stirred at 40°C for 24 hours. The resulting mixture was transferred to a crystallization kettle and placed in an oven at 120°C for crystallization for 24 hours. After the reaction, it was taken out, cooled, filtered with suction, washed, and dried to obtain a powdery solid. The white powdery solid was calcined at 550° C. for 6 hours in an air atmosphere. The reduction of the catalyst is carried out at 500°C for 2 hours under a hydrogen atmosphere to obtain Au-Pd / M-SiO 2...

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Abstract

The invention discloses a synthetic method for a mesoporous foamed silica-loaded precious metal nanometer catalyst. According to the invention, ethyl orthosilicate (TEOS) is used as a silicon source, Pluronic P123 is used as a structure-directing agent, 1,3,5-trimethylbenzene is used as a pore-enlarging agent, a precious metal inorganic salt is used as a precursor, and 3-(mercaptopropyl)trimethoxysilane is used as a precious metal salt coupling agent; and a one-pot process is employed for synthesis of the mesoporous foamed silica-loaded Au(Au-Pt or Au-Pd) nanometer catalyst. The method provided by the invention has the advantages of simple synthesis process, good repeatability, high metal dispersity, etc.; the prepared catalyst has the advantages of good precious metal nanoparticle dispersity (wherein a particle size is in a range of 2 to 8 nm) and well-developed mesoporous channels (5 to 25 nm); and precious metal nanoparticles are directly connected with a silicon skeleton through interaction with organic groups on the skeleton, so the catalyst has substantially improved stability and prolonged service life.

Description

technical field [0001] The invention relates to a synthesis method of a mesoporous foam silicon dioxide loaded noble metal nano catalyst. Specifically, using organosilicon as the silicon source, Pluronic P123 as the structure-directing agent, 1,3,5-trimethylbenzene as the pore-expanding agent, and noble metal inorganic salt as the precursor, a mesoporous foam supported by silica was synthesized in one pot. Au(Au-Pt, Au-Pd) nanocatalysts. Background technique [0002] Since 1831, the British Phillips (Philips) proposed the contact method using platinum as a catalyst to produce sulfuric acid. By 1875, the method was industrialized, and the research and industrial application of noble metal catalysts have emerged in an endless stream. In the 1950s, Pt / Al was developed for oil reforming to produce high-quality gasoline 2 o 3 Catalyst: The "three-way catalyst" (based on platinum, supplemented by palladium and rhodium) was developed and widely used for the purification of autom...

Claims

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Application Information

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IPC IPC(8): B01J23/52
CPCB01J23/52B01J35/617B01J35/635B01J35/638B01J35/647
Inventor 吴萍萍白鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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