Synthesis of bimetallic nanoparticle catalysts using microwave irradiation

Patent metadata

Field	Value
Publication number	US-10960470-B2
Application number	US-201414782844-A
Country	US
Kind code	B2
Filing date	Apr 11, 2014
Priority date	Apr 12, 2013
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

The present invention provides compositions and methods of making bimetallic metal alloys of composition for example, Rh/Pd; Rh/Pt; Rh/Ag; Rh/Au; Rh/Ru; Rh/Co; Rh/Ir; Rh/Ni; Ir/Pd; Ir/Pt; Ir/Ag; Ir/Au; Pd/Ni; Pd/Pt; Pd/Ag; Pd/Au; Pt/Ni; Pt/Ag; Pt/Au; Ni/Ag; Ni/Au; or Ag/Au prepared using microwave irradiation.

First claim

The invention claimed is:

1. A method of making a bimetallic randomly alloyed nanoparticle catalyst comprising the steps of:
providing a reaction vessel;
adding a reaction mixture comprising a first solution of poly(vinylpyrrolidone) and a suitable reducing agent in a first solvent to the reaction vessel;
heating the reaction mixture using a microwave;
adding a first metal precursor solution comprising a first metal-precursor-complex comprising Rh, Jr, Pd, Pt, Ni, Ag, or Au to the reaction mixture;
adding a second metal precursor solution comprising a second metal-precursor-complex comprising Ru, Co, Jr, Ni, Pd, Pt, Ag, Au, or a combination thereof to the reaction mixture;
wherein the first metal-precursor-complex and the second metal-precursor-complex are provided at a bimetallic ratio of from 1:9 to 9:1;
forming a bimetallic randomly alloyed nanoparticle comprising a first metal and a second metal, the first metal being that of the first metal-precursor-complex and the second metal being that of the second metal-precursor complex, the bimetallic randomly alloyed nanoparticle having a random distribution of the first metal and the second metal at the bimetallic ratio therein;
purifying the bimetallic randomly alloyed nanoparticle;
forming a suspension comprising a poly(vinylpyrrolidone)-capped metal complex and the purified bimetallic randomly alloyed nanoparticle; and
adding a pre-calcined SiO 2 to the suspension comprising the poly(vinylpyrrolidone)-capped metal complex and the purified bimetallic randomly alloyed nanoparticle, thereby forming the bimetallic randomly alloyed nanoparticle catalyst.

2. The method of claim 1 , wherein the one or more bimetallic randomly alloyed nanoparticles have a bimetallic ratio of about 1:1; 1:2; 1:3; 2:1; or 3:1.

3. The method of claim 1 , wherein the bimetallic randomly alloyed nanoparticle comprises a Rh:Pd bimetallic randomly alloyed nanoparticle; a Rh:Pt bimetallic randomly alloyed nanoparticle; a Rh:Ag bimetallic randomly alloyed nanoparticle; a Rh:Au bimetallic randomly alloyed nanoparticle; a Rh:Ru bimetallic randomly alloyed nanoparticle; a Rh:Co bimetallic randomly alloyed nanoparticle; a Rh:Ir bimetallic randomly alloyed nanoparticle; a Rh:Ni bimetallic randomly alloyed nanoparticle; a Ir:Pd bimetallic randomly alloyed nanoparticle; a Ir:Pt bimetallic randomly alloyed nanoparticle; a Ir:Ag bimetallic randomly alloyed nanoparticle; a Ir:Au bimetallic randomly alloyed nanoparticle; a Pd:Ni bimetallic randomly alloyed nanoparticle; a Pd:Pt bimetallic randomly alloyed nanoparticle; a Pd:Ag bimetallic randomly alloyed nanoparticle; a Pd:Au bimetallic randomly alloyed nanoparticle; a Pt:Ni bimetallic randomly alloyed nanoparticle; Pt:Ag bimetallic randomly alloyed nanoparticle; a Pt:Au bimetallic randomly alloyed nanoparticle; a Ni:Ag bimetallic randomly alloyed nanoparticle; a Ni:Au bimetallic randomly alloyed nanoparticle; a Ag:Au bimetallic randomly alloyed nanoparticle; or a combination thereof.

4. The method of claim 1 , wherein the bimetallic randomly alloyed nanoparticle is a Rh:Au bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:1, 1:2, 1:3, 2:1, or 3:1; a Rh:Ag bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:1, 1:2, 1:3, 2:1, or 3:1; a Rh:Pd bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:1, 1:2, 1:3, 2:1, or 3:1; or a Rh:Pt bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:1, 1:2, 1:3, 2:1, or 3:1.

5. The method of claim 1 , wherein the bimetallic randomly alloyed nanoparticle is a Rh:Au bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 2.33:1, 1.78:1, 1:1.2, 1:3.35, or 1:5.67.

6. The method of claim 1 , wherein the bimetallic randomly alloyed nanoparticle is a Rh:Ag bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 2.33:1, 1.5:1, 1.04:1, 1:2.7, 1:3.35. 1:4.88, or 1:1.2.

7. The method of claim 1 , wherein the bimetallic randomly alloyed nanoparticle is a Rh:Pd bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:3, 1:2, 1:1, 2:1, or 3:1; or wherein the bimetallic randomly alloyed nanoparticle is a Rh:Pt bimetallic randomly alloyed nanoparticle with a bimetallic ratio of about 1:3, 1:2, 1:1, 2:1, or 3.1.

8. The method of claim 1 , further comprising the step of loading the bimetallic randomly alloyed nanoparticle catalyst into a quartz U-tube suspended above a porosity frit.

9. The method of claim 1 , further comprising the steps of sonicating, isolating, washing, and drying the bimetallic randomly alloyed nanoparticle.

Assignees

• Univ Texas

Inventors

• Humphrey Simon M
• Garcia Stephany

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/45

  Nanoparticles · CPC title