Gold nanoparticle superlattice embedded in porous silica and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-12251689-B2
Application number	US-202218065572-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Sep 28, 2016
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

The present invention relates to a catalyst composition comprising a gold nanoparticle superlattice embedded in hierarchical porous silica and a method for manufacturing the same. The catalyst composition comprising a gold nanoparticle superlattice embedded in hierarchical porous silica according to the present invention comprises micropores and mesopores in the superlattice, so that these pores are channelized to allow the rapid access of reactants to surfaces of gold nanoparticles, and the catalyst composition is very structurally stable and has excellent catalytic activity, and thus has an effect of exhibiting a CO conversion rate of 100% at room temperature.

First claim

The invention claimed is:

1. A method for manufacturing a catalyst composition, comprising the steps of:
(1) preparing a dispersion of gold nanoparticles functionalized with thiolated poly(ethylene glycol);
(2) adding a silica precursor to the dispersion of gold nanoparticles and stirring the dispersion to obtain a precipitate; and
(3) calcining the precipitate in an inert atmosphere to prepare a gold nanoparticle superlattice embedded in hierarchical porous silica.

2. The method for manufacturing a catalyst composition according to claim 1 ,
wherein, in step (1), the thiolated poly(ethylene glycol) has an average molecular weight of 0.1 to 5 kDa.

3. The method for manufacturing a catalyst composition according to claim 1 ,
wherein, in step (1), the gold nanoparticles functionalized with thiolated poly(ethylene glycol) have an average hydrodynamic diameter of 20 to 40 nm.

4. The method for manufacturing a catalyst composition according to claim 1 ,
wherein, in step (1), the thiolated poly(ethylene glycol) functionalized on the surfaces of gold nanoparticles has an average number density of 2 to 5 nm-2.

5. The method for manufacturing a catalyst composition according to claim 1 ,
wherein, in step (2), the silica precursor is at least one selected from the group consisting of tetraethyl orthosilicate, tetramethyl orthosilicate, tetrapropyl orthosilicate, tetrabutyl orthosilicate, tetrachlorosilane, and sodium silicate.

6. The method for manufacturing a catalyst composition according to claim 1 ,
wherein, in step (3), the calcination temperature is 400 to 500° C.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Choi Sung Min
• Kang Shin Hyun

Classifications

• B01J23/48 Primary

  Silver or gold · CPC title

• B01D53/864 Primary

  Removing carbon monoxide or hydrocarbons · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/031

  Precipitation · CPC title

• B01J21/08

  Silica · CPC title