Photocatalyst, catalyst filter, catalyst module, and air purification system including the same

Patent metadata

Field	Value
Publication number	US-12544740-B2
Application number	US-202318158714-A
Country	US
Kind code	B2
Filing date	Jan 24, 2023
Priority date	Aug 18, 2022
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A photocatalyst including a first metal oxide; and a second metal oxide, wherein the first metal oxide is disposed on a surface of the second metal oxide, and wherein absorbance of the photocatalyst in a wavelength region of about 200 nanometers (nm) to about 600 nm is about 5% to about 50% greater than an absorbance of TiO 2 in the wavelength region of about 200 nm to about 600 nm.

First claim

What is claimed is:

1 . A photocatalyst, comprising:
a first metal oxide; and a second metal oxide, wherein the first metal oxide is disposed on a surface of the second metal oxide, and wherein absorbance of the photocatalyst in a wavelength region of about 200 nanometers to about 600 nanometers is about 5% to about 50% greater than an absorbance of TiO 2 in the wavelength region of about 200 nanometers to about 600 nanometers, wherein the first metal oxide consists of nano-sized primary particles, and the second metal oxide consists of micro-sized primary particles or secondary particles each comprised of a plurality of micro-sized primary particles.

2 . The photocatalyst of claim 1 , wherein the absorbance of the photocatalyst in a wavelength region of about 200 nanometers to about 400 nanometers is about 30% to about 400% greater than an absorbance of TiO 2 in the wavelength region of about 200 nanometers to about 400 nanometers.

3 . The photocatalyst of claim 1 , wherein a first metal of the first metal oxide has an oxidation number of +1.

4 . The photocatalyst of claim 1 , wherein the first metal oxide comprises at least one of copper, platinum, gold, silver, zinc, manganese, or a combination thereof.

5 . The photocatalyst of claim 1 , wherein the first metal oxide comprises at least one of Cu 2 O, Pt 2 O, Au 2 O, Ag 2 O, Zn 2 O, Mn 2 O, or a combination thereof.

6 . The photocatalyst of claim 1 , wherein an amount of the first metal oxide is about 0.5 parts by weight to about 10 parts by weight, based on 100 parts by weight of the second metal oxide.

7 . The photocatalyst of claim 1 , wherein the second metal oxide comprises at least one of titanium, zinc, zirconium, tantalum, tungsten, or a combination thereof.

8 . The photocatalyst of claim 1 , wherein the second metal oxide comprises at least one of TiO 2 , ZnO, ZrO 2 , Ta 2 O 5 , WO 3 , or a combination thereof.

9 . The photocatalyst of claim 1 , wherein the first metal oxide and the second metal oxide are each independently in the form of wires, clusters, crystals, or a combination thereof.

10 . The photocatalyst of claim 1 wherein a specific surface area of the second metal oxide is about 100 square meters per gram to about 500 square meters per gram.

11 . The photocatalyst of claim 1 , wherein average photocurrent density of the photocatalyst is about 20 microamperes per square centimeter to about 50 microamperes per square centimeter at a potential of 0.5 Volts vs. Ag/AgCl in response to irradiation having a wavelength of about 360 nanometers and about 365 nanometers.

12 . The photocatalyst of claim 1 , wherein a charge carrier density of the photocatalyst is about 3.0×10 20 /cm 3 to about 4.0×10 20 /cm 3 , as determined by Equation 1:

1

C
sc
2

=

(

2

e
⁢

ε
0

⁢
ε
⁢

N
D

)

[

(

E
S

-

E
FB

)

-

kT
e

]

Equation
⁢

1

wherein, in Equation 1,
N D denotes charge carrier density,
C sc denotes space charge capacity,
e denotes elementary charge,
ε denotes a non-dielectric constant of an electrode material,
ε 0 denotes vacuum permittivity,
E s denotes applied potential,
E FB denotes flat band potential,
k denotes a Boltzmann constant, and
T denotes an absolute temperature,
when measured in a 0.1 molar phosphate buffer solution and at a potential of about −0.5 Volts to about 2.0 Volts vs. Ag/AgCl.

13 . The photocatalyst of claim 1 , wherein the photocatalyst is used for decomposition and removal of a gaseous volatile organic compound.

14 . The photocatalyst of claim 1 , wherein the photocatalyst has:
a decomposition efficiency for a gaseous volatile organic compound that is greater than or equal to about 85% according to Equation 2, when measured at 23° C. and a relative humidity of 0%, and a decomposition efficiency for a gaseous volatile organic compound that is greater than or equal to about 90% according to Equation 2, when measured at 23° C. and a relative humidity of 50%:
decomposition efficiency (%)={(concentration of converted CO 2 )/(initial concentration of gaseous volatile organic compound)×100%}.  Equation 2

15 . A catalyst filter, comprising:
a porous ceramic support; and a photocatalyst disposed on a surface of the porous ceramic support,
wherein the photocatalyst comprises:
a first metal oxide; and
a second metal oxide,
wherein the first metal oxide is disposed on a surface of the second metal oxide, and
wherein absorbance of the photocatalyst in a wavelength region of about 200 nanometers to about 600 nanometers is about 5% to about 50% greater than an absorbance of TiO 2 in the wavelength region of about 200 nanometers to about 600 nanometers,
wherein
the first metal oxide consists of nano-sized primary particles, and

the second metal oxide consists of micro-sized primary particles or secondary particles each comprised of a plurality of micro-sized primary particles.

16 . The catalyst filter of claim 15 , wherein the porous ceramic support has a honeycomb structure.

17 . The catalyst filter of claim 15 , wherein the porous ceramic support is a single laminate or a multi-layered laminate.

18 . A catalyst module, comprising:
a catalyst filter; and an energy supply source, wherein the energy supply source supplies energy to the catalyst filter for catalyst activation, wherein the catalyst filter comprises: a porous ceramic support; and a photocatalyst disposed on a surface of the porous ceramic support,
wherein the photocatalyst comprises:
a first metal oxide; and
a second metal oxide,
wherein the first

Assignees

• Samsung Electronics Co Ltd

Inventors

• Koo Minseok
• Kwon Hyukjae
• Yang Dongsik
• Lee Hyun Chul
• Lee Jongmin
• Ji Sangmin

Classifications

• B01J21/063 Primary

  Titanium; Oxides or hydroxides thereof · CPC title

• B01D2259/804

  UV light · CPC title

• B01D2257/708

  Volatile organic compounds V.O.C.'s · CPC title

• B01D2255/802

  Photocatalytic · CPC title

• B01D2255/20761

  Copper · CPC title