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Ultra-dispersed noble metal heterogeneous catalyst and application thereof

A heterogeneous catalyst and noble metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., to achieve the effect of good dispersion, good activity, and uniform size

Pending Publication Date: 2020-11-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although ruthenium nanoparticles with different sizes have been synthesized using different capping agents, there are few reports on the synthesis of ruthenium nanoparticles in the sub-2nm system

Method used

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  • Ultra-dispersed noble metal heterogeneous catalyst and application thereof
  • Ultra-dispersed noble metal heterogeneous catalyst and application thereof
  • Ultra-dispersed noble metal heterogeneous catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Based on TiO 2-x Heterogeneous catalysts loaded with 10%Ru

[0024] Take 0.4g TiO 2 (B) After calcination at 600 °C for 1 h under a nitrogen atmosphere, a titania material with oxygen vacancies was obtained, which was labeled as TiO 2-x Material.

[0025] Then add the TiO prepared above into the 100mL beaker 2-x Material 0.2 g, then add 4ml pre-constituted RuCl 3 Aqueous solution (RuCl 3 The concentration of the aqueous solution is 10 mg / mL), stir and mix evenly, so that the RuCl 3 Adsorbed on TiO 2-x material. Then heat and stir at 70° C. until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine titanium dioxide and Ru after later calcination.

[0026] The solid mixture prepared above was placed in a tube furnace and calcined at 300 °C for 1 h in a hydrogen atmosphere to obtain TiO 2-x Supported Ru catalyst, Ru loading is 10%.

Embodiment 2

[0027] Example 2 Based on TiO 2-x Heterogeneous Catalyst Supported with 12%Ru

[0028] Take 0.4g TiO 2 (B) After calcination at 600 °C for 1 h under a nitrogen atmosphere, a titania material with oxygen vacancies was obtained, which was labeled as TiO 2-x Material.

[0029] Then add the TiO prepared above into the 100mL beaker 2-x Material 0.2 g, then add 4.8ml pre-constituted RuCl 3 Aqueous solution (RuCl 3 The concentration of the aqueous solution is 10 mg / mL), stir and mix evenly, so that the RuCl 3 Adsorbed on TiO 2-x material. Then heat and stir at 70° C. until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine titanium dioxide and Ru after later calcination.

[0030] The solid mixture prepared above was placed in a tube furnace and calcined at 300 °C for 1 h in a hydrogen atmosphere to obtain TiO 2-x Supported Ru catalyst with a Ru loading of 12%.

Embodiment 3

[0031] Example 3 Based on TiO 2-x Heterogeneous catalyst loaded with 15%Ru

[0032] Take 0.4g TiO 2 (B) After calcination at 600 °C for 1 h under a nitrogen atmosphere, a titania material with oxygen vacancies was obtained, which was labeled as TiO 2-x Material.

[0033] Then add the TiO prepared above into the 100mL beaker 2-x Material 0.2 g, then add 6ml pre-constituted RuCl 3 Aqueous solution (RuCl 3 The concentration of the aqueous solution is 10 mg / mL), stir and mix evenly, so that the RuCl 3 Adsorbed on TiO 2-x material. Then heat and stir at 70° C. until the deionized water in the beaker is completely volatilized to obtain a solid mixture. The solid obtained by this method can closely and uniformly combine titanium dioxide and Ru after later calcination.

[0034] The solid mixture prepared above was placed in a tube furnace and calcined at 300 °C for 1 h in a hydrogen atmosphere to obtain TiO 2-x Supported Ru catalyst, the Ru loading is 15%.

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Abstract

The invention discloses an ultra-dispersed noble metal heterogeneous catalyst and application thereof. The catalyst comprises a titanium dioxide carrier with oxygen vacancy and noble metal particles loaded on the titanium dioxide carrier; the loading capacity of the noble metal particles is 10-25%, and the noble metal particles are Au, Ag, Rh, Os, Ir, Ru, Pt or Pd particles, preferably Ru or Pd particles; and the average particle size of the noble metal particles is 1-3nm. Compared with a common titanium-dioxide-loaded noble metal catalyst, the heterogeneous catalyst provided by the inventionhas the advantages that precious metal particles are uniformly dispersed, and the precious metal particles are not agglomerated along with increase of the loading capacity; electrons are transferreddue to the combined action of oxygen vacancies of noble metal and titanium dioxide in the heterogeneous catalyst, so that the noble metal is rich in charges, and the catalyst is not prone to agglomeration.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an ultra-dispersed noble metal heterogeneous catalyst and its application. Background technique [0002] Supported metal catalysts are one of the most common heterogeneous catalysts and are widely used in the chemical industry. Both the metal and the support are very important, because in many cases, the support can not only stabilize the dispersed metal, but also change its morphology and electronic structure through the metal-support interaction, changing the performance of the catalyst. In particular, strong metal support interaction (SMSI), a term coined by Tauster et al. (Garten, J. Am. Chem. Soc. 1978, 100, 170 – 175) to describe the The phenomenon that platinum group metals (PGMs) on reducible oxides lose their ability to adsorb small molecules after reduction at high temperature has been studied for a long time. SMSI enables charge transfer and mass transfer from the support to...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/44B01J37/18C07D215/18
CPCB01J23/462B01J23/44B01J37/18C07D215/18B01J35/40
Inventor 魏中哲周强王建国
Owner ZHEJIANG UNIV OF TECH
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