Catalysts, methods, and systems for preparing carbamates

Patent metadata

Field	Value
Publication number	US-10000448-B2
Application number	US-201415124397-A
Country	US
Kind code	B2
Filing date	Mar 13, 2014
Priority date	Mar 13, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

Methods, systems and kits for preparing carbamates as well as catalysts for preparing the carbamates, are disclosed. The methods for preparing carbamate can include providing a catalyst comprising cerium oxide (CeO2) and at least one metal selected from the group consisting of iron (Fe), manganese (Mn), titanium (Ti), cobalt (Co), aluminum (Al), zinc (Zn), calcium (Ca), tin (Sn), indium (In), and any combination thereof; contacting the catalyst with at least one amine and at least one alcohol to form a mixture; and contacting the mixture with carbon dioxide under conditions sufficient to form the carbamate.

First claim

What is claimed is:

1. A catalyst comprising cerium oxide (CeO 2 ) and aluminum (Al) comprising formula Ce x Al y O 2 , wherein the catalyst is a calcined catalyst, and wherein x is 0.966 and y is 0.033.

2. The catalyst of claim 1 , wherein the catalyst is a heterogeneous catalyst.

3. A method of preparing a carbamate, the method comprising:
contacting a catalyst with at least one amine and at least one alcohol to form a mixture; and
contacting the mixture with carbon dioxide under conditions sufficient to form the carbamate,
wherein the catalyst comprises cerium oxide (CeO 2 ) and aluminum (Al) comprising formula Ce x Al y O 2 , wherein the catalyst is a calcined catalyst, and wherein x is 0.966 and y is 0.033.

4. The method of claim 3 , wherein the at least one alcohol comprises methanol, ethanol, propanol, butanol, n-hexanol, or a combination of any two or more thereof.

5. The method of claim 3 , wherein the at least one amine comprises at least one aliphatic amine.

6. The method of claim 5 , wherein the at least one aliphatic amine comprises methylamine, ethylamine, n-propylamine, n-butylamine, n-hexylamine, n-octylamine, or a combination of any two or more thereof.

7. The method of claim 3 , wherein the at least one amine comprises at least one aromatic amine.

8. The method of claim 7 , wherein the at least one aromatic amine comprises benzylamine.

9. The method of claim 3 , wherein a molar ratio of the at least one amine to the at least one alcohol in the mixture is about 1:40 to about 1:200.

10. The method of claim 3 , wherein a molar ratio of the at least one amine to the at least one alcohol in the mixture is about 1:100.

11. The method of claim 3 , wherein contacting the mixture with the carbon dioxide comprises heating the mixture and the carbon dioxide at a temperature of about 160° C. to about 180° C.

12. The method of claim 3 , wherein contacting the mixture with the carbon dioxide comprises heating the mixture and the carbon dioxide at a pressure of about 4.0 MPa to about 7.0 MPa.

13. The method of claim 3 , wherein contacting the mixture with the carbon dioxide comprises heating the mixture and the carbon dioxide for about 2 hours to about 16 hours.

14. The catalyst of claim 1 , wherein the catalyst further comprises at least one metal selected from the group consisting of iron (Fe), manganese (Mn), titanium (Ti), cobalt (Co), zinc (Zn), calcium (Ca), tin (Sn), indium (In), and a combination of any two or more thereof.

Assignees

• Univ East China Science & Tech

Inventors

• Hou Zhenshan
• Zhang Ran

Classifications

• B01J21/00

  Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium · CPC title

• B01J2523/31

  Aluminium · CPC title

• B01J23/83

  with rare earths or actinides · CPC title

• B01J23/34

  Manganese · CPC title

• Y02P20/584

  Recycling of catalysts · CPC title