Nano-catalyst composite for decomposing formaldehyde at room temperature and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2020269216-A1
Application number	US-201916545800-A
Country	US
Kind code	A1
Filing date	Aug 20, 2019
Priority date	Feb 25, 2019
Publication date	Aug 27, 2020
Grant date	—

Abstract

Some embodiments of the disclosure provide a nano-catalyst composite for decomposing formaldehyde at room temperature and a preparation method. According to an embodiment, a nano-catalyst composite includes an alumina carrier of a nano dual-via structure. An inner part and a surface of the nano-alumina dual-via structure are loaded with a non-stoichiometric nano-metal manganese dioxide (MnO2-x) catalyst. According to another embodiment, a preparation method of a nano-catalyst composite for decomposing formaldehyde at room temperature includes the following steps. (1) Loading manganese dioxide onto the nano-alumina carrier by an electron beam thermal evaporation technology. (2) Conducting hydrogenation treatment on the manganese dioxide catalyst on the nano-alumina carrier under a condition of specific hydrogen pressure, specific temperature, and a specific hydrogenation time, to obtain the non-stoichiometric nano manganese dioxide (MnO2-x) catalyst.

First claim

The disclosure claimed is:

1 . A nano-catalyst composite for decomposing formaldehyde at room temperature, prepared by a method comprising the steps of:
(1) loading manganese dioxide onto a nano-alumina carrier by an electron beam thermal evaporation technology; and (2) conducting a hydrogenation treatment on the manganese dioxide on the nano-alumina carrier under a condition of specific hydrogen pressure, specific temperature, and a specific hydrogenation time, to obtain a non-stoichiometric nano manganese dioxide (MnO 2-x ) catalyst; wherein: the nano-catalyst composite comprises an alumina carrier of a nano dual-via structure; and an inner part and a surface of the alumina carrier of the nano dual-via structure are loaded with a non-stoichiometric nano-metal manganese dioxide (MnO 2-x ) catalyst.

2 . The nano-catalyst composite according to claim 1 , wherein the formaldehyde is decomposed at room temperature by the non-stoichiometric nano-metal manganese dioxide (MnO 2-x ) catalyst of the nano-catalyst composite.

3 . The nano-catalyst composite according to claim 2 , wherein a non-stoichiometric ratio x of the nano manganese dioxide (MnO 2-x ) catalyst is between 0.05 and 0.2.

4 . The nano-catalyst composite according to claim 1 , further comprising a catalyst carrier, the catalyst carrier being an alumina of a nano dual-via structure.

5 . The nano-catalyst composite according to claim 4 , wherein a pore diameter of the alumina of a nano dual-via structure is between 80 nm and 350 nm.

6 . The nano-catalyst composite according to claim 1 , wherein a pore diameter of the alumina carrier of a nano dual-via structure is between 80 nm and 350 nm.

7 . The nano-catalyst composite according to claim 1 , wherein a non-stoichiometric ratio x of the nano manganese dioxide (MnO 2-x ) catalyst is between 0.05 and 0.2.

8 . A preparation method of a nano-catalyst composite for decomposing formaldehyde at room temperature comprising the steps of:
(1) loading manganese dioxide onto a nano-alumina carrier by an electron beam thermal evaporation technology; and (2) conducting a hydrogenation treatment on the manganese dioxide on the nano-alumina carrier under a condition of specific hydrogen pressure, specific temperature, and a specific hydrogenation time, to obtain a non-stoichiometric nano manganese dioxide (MnO 2-x ) catalyst.

9 . The preparation method according to claim 8 , wherein in the hydrogenation treatment condition, the specific hydrogen pressure is between 1.5 MPa and 2.5 MPa, the specific temperature is between 280° C. and 420° C., and the specific hydrogenation time is between 2 hours and 6 hours.

Assignees

• Univ Jiliang China

Inventors

• Fan Lili
• Huang Yuexiang

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/393

  Metal or metal oxide crystallite size · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title