Process for producing nanostructured material, product and use

Patent metadata

Field	Value
Publication number	US-12370526-B2
Application number	US-201917415857-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Dec 21, 2018
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present invention describes a process for producing nanostructured material, produced from polymer waste doped with alkaline metals and/or alkaline earth metals, which is capable of capturing and storing CO2. The process for obtaining the material uses waste generated by the polymer industry and is therefore environmentally sustainable. The product produced, that is, the nanostructured material, shows high CO2 absorption capacity, being able to absorb up to 80% by weight in mass in CO2. In addition, the product produced shows low density, an important characteristic for application in vehicles. Therefore, the product obtained can be used for capturing and storing CO2 emitted by different emission sources, mainly mobile sources such as vehicles, but can also be used in industries such as the mining industry, oil industry, inter alia, in addition to the automotive industry.

First claim

The invention claimed is:

1. A process of making a nanostructured material, comprising the following steps:
(a) preparing a solution by solubilizing a metal hydroxide with a purity of 95 to 99.99% in acetyl acetone with a purity of 97 to 99%, in a ratio of 0.5 to 5 parts of metal hydroxide to 1 part of acetyl acetone;
(b) stirring the solution prepared in step (a) for 15 to 20 minutes;
(c) transferring the solution obtained in step (b) to an oven at a temperature of from 90° C. to 120° C. for a period of 18 to 36 hours, until a compound remains with mass constant forming a metal acetylacetonate (X(acac)n);
(d) transferring the compound obtained in step (c) to a polystyrene dissolved in an organic solvent;
(e) transferring the compound obtained in step (d) to a reactor and pressurizing the reactor to an inert atmosphere from 5 to 15 bar;
(f) heating the reactor at a rate of 5° C. to 10° C. min −1 to a temperature of 500° C. to 600° C. and maintaining at that temperature for a period of 3 to 8 hours;
(g) cooling the reactor to a temperature of 20° C. to 30° C.

2. The process of making a nanostructured material of claim 1 , wherein the metal hydroxide in step (a) is selected from the group comprising alkali and/or alkaline earth metals.

3. The process of making a nanostructured material of claim 1 , wherein the metal acetylacetonate (X(acac)n) in step (c) is selected from the group comprising calcium, magnesium, sodium and beryllium acetylacetonate, where X is Ca, Mg, Na or Be, respectively, and n is 1 or 2.

4. The process of making a nanostructured material of claim 1 , wherein the organic solvent in step (d) is ethyl acetate or acetone.

5. The process of making a nanostructured material of claim 1 , wherein the inert atmosphere in step (e) comprises nitrogen or argon.

6. The process of making a nanostructured material of claim 1 , wherein the ratio of the metal hydroxide to acetyl acetone in step (a) is 1:1.

7. The process of making a nanostructured material of claim 1 , wherein the oven temperature in step (c) is 105° C.

8. The process of making a nanostructured material of claim 1 , wherein, in step (d), the compound obtained in step (c) is transferred to the polystyrene dissolved in the organic solvent in the proportion of 1 g of the compound obtained in step (c) in 20 ml of organic solvent.

9. The process of making a nanostructured material of claim 1 , wherein the reactor in step (f) is heated to a temperature of 530° C.

Assignees

• Univ Minas Gerais
• Petroleo Brasileiro S A —Petrobras
• Fund De Amparo A Pesquisa Do Estado De Minas Gerais—Fapemig
• Fca Fiat Chrysler Automoveis Brasil Ltda

Inventors

• Belchior Jadson Claudio
• Araujo Maria Helena
• Camilo Moura Flavia Cristina
• Silveira Vieira Sara
• Carvalho Monteiro De Castro Mateus
• Caffaro Vicentini Pedro
• Neves Loureiro Luciana

Classifications

• Y02C20/40

  of CO2 · CPC title

• B01J20/04 Primary

  comprising compounds of alkali metals, alkaline earth metals or magnesium · CPC title

• B01D2253/25

  Coated, impregnated or composite adsorbents · CPC title

• B01J20/3204

  Inorganic carriers, supports or substrates · CPC title

• B01J20/3078 Primary

  Thermal treatment, e.g. calcining or pyrolizing · CPC title