Porous one-dimensional polymeric graphitic carbon nitride-based nanosystems for catalytic conversion of carbon monoxide and carbon dioxide under ambient conditions

Patent metadata

Field	Value
Publication number	US-11299395-B2
Application number	US-202016846020-A
Country	US
Kind code	B2
Filing date	Apr 10, 2020
Priority date	Jan 14, 2020
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

In some aspects and embodiments, the present application provides a wide range of porous 1-D polymeric graphitic carbon-nitride materials that are atomically doped with binary metals in different morphologies. In some embodiments, the graphitic carbon-nitride materials can be prepared with high mass production from inexpensive and natural abundant precursors. In some embodiments, the materials were used successfully for the oxidation of CO to CO2 under ambient reaction temperature in addition to the reduction of CO2 into hydrocarbons. In some embodiments, the materials can be used for practical and large-scale gas conversion for household or industrial applications.

First claim

What is claimed is:

1. A graphitic-like carbon nitride nanostructure, wherein the nanostructure is doped atomically with one or more metal elements;
wherein the nanostructure comprises at least one of nanotubes, nanorods, or nanofibers; and
wherein the one or more metal elements comprise a metal element selected from the group consisting of gold (Au), palladium (Pd), copper (Cu), and platinum (Pt);
wherein the nanostructure is additionally characterized by at least one of the following features:
(i) wherein the nanostructure is doped with 1-1.2 wt. % Au/Pd, or 1-1.2 wt. % Pd/Cu, or 1-1.2 wt. % Pt/Pd;
(ii) wherein the nanostructure is selected from the group consisting of a carbon nitride nanotube doped with Au and Pd (Au/Pd/g C 3 N 4 NT); a carbon nitride nanofiber doped with Au and Pd (Au/Pd/gC 3 N 4 NF); a carbon nitride nanorod doped with Pt and Pd (Pt/Pd/CN nanorod); and a carbon nitride nanotube doped with Pd and Cu (Pd/Cu/gC 3 N 4 NF); or
(iii) wherein the nanostructure is porous, having surface area ranging from 300 m 2 g −1 to 350 m 2 g −1 , an average pore size/diameter ranging from 45 nm to 65 nm, and a pore volume ranging from 0.45 cc/g to 0.65 cc/g.

2. The nanostructure of claim 1 , wherein the one or more metal elements comprise Pd and at least a second metal element selected from the group consisting of Au and Pt.

3. The nanostructure of claim 1 , wherein the nanostructure is one-dimensional (1-D).

4. The nanostructure of claim 1 , wherein the nanostructure is functionalized with one or more metal-based nanoparticles, single atoms, metal oxide nanoparticles, or hybrid nanoparticles; and wherein the nanostructure is a catalyst for a CO oxidation reaction and/or a CO 2 reduction reaction.

5. The graphitic-like carbon nitride nanostructure of claim 4 , wherein the one or more metal elements are in the form of dopants, single atoms, nanoparticles, ions, oxide, or any combination thereof.

6. The graphitic-like carbon nitride nanostructure of claim 1 , wherein the nanostructure is doped atomically with Pd.

7. The graphitic-like carbon nitride nanostructure of claim 6 , wherein the nanostructure is doped atomically at least a second metal element selected from the group consisting of Au, Cu, and Pt.

8. The graphitic-like carbon nitride nanostructure of claim 7 , wherein the nanostructure is doped with 1-1.2 wt. % Au/Pd, or 1-1.2 wt. % Pd/Cu, or 1-1.2 wt. % Pt/Pd.

9. The graphitic-like carbon nitride nanostructure of claim 1 , wherein the nanostructure is doped with 1-1.2 wt. % metal elements.

10. The graphitic-like carbon nitride nanostructure of claim 1 , wherein the nanostructure is selected from the group consisting of a carbon nitride nanotube doped with Au and Pd (Au/Pd/g C 3 N 4 NT); a carbon nitride nanofiber doped with Au and Pd (Au/Pd/gC 3 N 4 NF); a carbon nitride nanorod doped with Pt and Pd (Pt/Pd/CN nanorod); and a carbon nitride nanotube doped with Pd and Cu (Pd/Cu/gC 3 N 4 NF).

11. The graphitic-like carbon nitride nanostructure of claim 1 , wherein the nanostructure is porous, having surface area ranging from 300 m 2 g −1 to 350 m 2 g −1 , an average pore size/diameter ranging from 45 nm to 65 nm, and a pore volume ranging from 0.45 cc/g to 0.65 cc/g.

12. The graphitic-like carbon nitride nanostructure of claim 1 , wherein the nanostructure is a catalyst for oxidizing CO in a CO gas mixture and/or reducing CO 2 in a CO 2 gas mixture at a temperature ranging from room temperature to 300° C., wherein the CO gas mixture contains 1%-100% of CO, and wherein the CO 2 gas mixture contains 1%-100% of CO 2 .

13. A graphitic-like carbon nitride nanostructure, wherein the nanostructure is doped atomically with one or more metal elements;
wherein the nanostructure comprises at least one of nanotubes, nanorods, or nanofibers; and
wherein the one or more metal elements comprise a metal element selected from the group consisting of gold (Au), palladium (Pd), copper (Cu), and platinum (Pt);
wherein the nanostructure is a catalyst for oxidizing CO in a CO gas mixture and/or reducing CO 2 in a CO 2 gas mixture at a temperature ranging from room temperature to 300° C., wherein the CO gas mixture contains 1%-100% of CO, and wherein the CO 2 gas mixture contains 1%-100% of CO 2 ;
wherein the CO and CO 2 conversion is enhanced using at least one other metal support selected from the group consisting of metal oxides, molecular sieves, carbon supports, ceramic-based materials, clay-based materials, and promoters,
wherein the metal oxides is at least one of TiO 2 , CeO 2 ,Fe 2 O 3 , SiO 2 , or Fe 3 O 4 ,
wherein the molecular sieves is a zeolite,
wherein the carbon supports is at least one of diamond, graphene, cellulose, lignin, and carbon nanotube,
wherein the ceramic-based materials comprises bioglass and hydroxyapatite,
wherein the clay-based materials comprises bentonite and halloysite, and
wherein the promotors comprises KOH, HCl, HNO 3 , and CH 3 COOH.

Assignees

• Univ Qatar

Inventors

• Eid Kamel Abdelmoniem Mohamed
• Abdullah Aboubakr Moustafa

Classifications

• B01J35/45

  Nanoparticles · CPC title

• B01J23/44

  Palladium · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• Y02C20/40

  of CO2 · CPC title

• B01J37/033

  Using Hydrolysis · CPC title