What is photocatalyst?
PHOTOTROPH
Photocatalytic air purification system
• When TiO2 is exposed to UV light of
a wavelength below 385 nanometers
two highly reactive substances are
formed: hydroxyl radicals [OH] and a
superoxide ion [O2-1].
• These are highly reactive chemical
species can decompose volatile
organic compounds, odor,
formaldehyde, bacteria into harmless
substance like Carbon Dioxide and
water.
Hong Kong Air Purifier Center
Why nano photocatalyst
• Nano is a measurement
unit:
nm = 10-9m
• Only nano sized TiO2
has the photocatalytic
property
Photocatalytic Ceramic Filter
PACF200
• Thermo dip-coating
method to fix the TiO2
onto the ceramic surface
• 200 cells per inch2, large
specific surface area
• Washable
• Low pressure drop
• Long life
Philips UVA
• Emit long-wave UV-A radiation in the 350 400 nm range
• 5000hr useful life, life to 50% failures
9000hr
1
Activated Carbon Filter PACF156
• 156 cell per inch2,
large specific
surface area
• Low pressure
drop
• Highly absorptive
Efficiency 1
• According to GB/T 18801-2002 with
reports/ certificate issued by a Laboratory
registered under Hong Kong Laboratory
Accreditation Scheme (HOKLAS) or
Mutual Recognition Agreement (MRA)
partner
TBC removal >90% in 4 hours
TVOC removal >90% in 7 hours
HCHO removal >90% in 10 hours
Efficiency 2
• According to JIS 1701-Part 2 with reports/
certificate issued by a Laboratory
registered under Hong Kong Laboratory
Accreditation Scheme (HOKLAS) or
Mutual Recognition Agreement (MRA)
partner
Fabric Prefilter
• Arrestance 80%
• Regenerative
• Fire resistance
GB/T 18801
• Test volume 30m3
• Phototroph
PUVA60 with 2
Philips Actintic,
ceramic filter area
600mm x 300mm
• Surface flowrate
XXXm/s
JIS 1701-Part 2
• Acetaldehyde removal
>360umol/m2/hr
• Acetaldehyde
(CH3CHO),
Formaldehyde (HCHO)
• Gas flow rate 3L/min
Acetaldehyde removal
>360umol/m2/hr
2
Fire Test BS476 Part 4
Resistance Curve
Formaldehy de
PUVA w ith PECF200
Total Volatile Organic Compounds
Total Bacteria
1
100
0.9
90
0.8
70
0.7
60
0.6
C/Ci
Pressure drop Pa
80
50
0.5
40
0.4
30
0.3
20
0.2
10
0.1
0
0
0
1000
2000
3000
4000
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Operation hr
Air flow rate m3/h
Removal Efficiency Curve
Resistance Curve
Comparison
Comparison
Activated Carbon
Filter PACF156
Other activated
carbon filter
Pressure drop
Very Lower
Higher
Contact area
Larger
Smaller
Efficiency
Tested by IAQ
Certificate Issuing
Body
No test report or
non-accredited
testing body
Installation
Simple single frame
slide in, minimal
space required
Zigzag install, more
space required
Application
Replace existing
carbon filter but no
need to change any
existing HVAC
Need more accurate
calculation especially
on pressure drop
and space
Phototroph TiO2 filter Other TiO2 filter
Pressure drop
Lower
Higher
Contact area
Larger
Smaller
UV lamp
“Philip” UV lamp
UVA (More Safety)
Un-known UVC
Model
Supply in complete
module from
manufacturer factory
Need after on site
fabrication, may
damage the coating
Efficiency
Accredited laboratory No test report or
test results
non-accredited
testing body
Durability
Higher, thermo dipcoating
Lower
The chart is based on the test result from a CNAS accredited laboratory
which is a MRA parnter of HOKLAS according to GB/T 18801-2002
Application
Q&A
Thank you
www.hkapc.org
3