Photoreduction of CO2
to fuels under sunlight
using optical-fiber reactor
指導教授：蘇順發 教授
學 生 ：周暐祥
報告日期：98/10/16
Introduction
• When sunlight reaches the surface
of the Earth, some of it is absorbed
and warms the Earth.
• Some sunlight is utilized by
green plants to produce
hydrocarbons that constitute
the world’s fossil fuel reserves,
but it takes millions of years.
Introduction cont.
• For recent year, more and more
fossil energy are consumed.
• When the fossil resource have
been used, it release a lot of the
CO2.
• And the fossil resource are not
renewable.
Introduction cont.
• As we know, the CO2 is one of
the greenhouse gas.
• For now a day, the temp. of the
earth is going to increase more
higher, and the climate is going
to be changed.
• So finding the renewable
resource is critical.
Introduction cont.
Reducing the CO2
• Removal of CO2 from Flue Gas
in the Packed Tower by
Ammonia Solution
• Production of precipitated
calcium carbonate from calcium
silicates and carbon dioxide
Introduction cont.
• photocatalytic reduction of CO2
into fuels by using natural
sunlight.
• Using sunlight recycle carbon
dioxide and produce fuels like
methanol or gasoline.
Photocatalytic conversion of CO2
into fuels reaction
• A continuous circular Pyrex
glass reactor (216 cm3) with a
quartz window for conduction of
light irradiation.
• Catalyst-coated optical fibers
were inserted in the reactor.
• the light source enter along the
fibers to conduct the
photocatalytic reaction on its
surface.
• The incident light is split to two
beams when hitting the internal
surface of fiber, due to the
difference of refraction index
between the TiO2 film and the
fiber.
• The UVA (320–500 nm) light was
obtained by using an appropriate
color filter.
• The temp. of the reactor maintain
。
around 75 C .
• The reactor was purged by CO2 gas
bubbling through distilled water for
。
1 h at 75 C before and during the
reaction.
• The space velocity of CO2 gas and
H2O vapor was maintained at 0.72
h1 for every experiment.
Results
• Bandgap energy of Cu (0.5 wt%)–Fe
(0.5 wt%)/TiO2–SiO2–acac is
substantially decreased to 1.55 eV,
which is promising to absorb the full
range of visible light.
• The largest production rate of
ethylene, 0.575 mmol/g-cat h is
observed on Cu(0.5 wt%)–
Fe(0.5wt%)/TiO2 coated over
optical fiber.
Conclusions
• The idea of recycling carbon dioxide
is not new, but has generally been
considered too difficult and
expensive to be worth the effort.
• But with oil prices exceeding $100
per barrel and concerns about global
warming mounting, researchers are
increasingly motivated to investigate
carbon recycling.
• The advantage of photo-driven
reaction is clearly benefited from the
un-limited solar energy.
Conclusions cont.
• The advantage of photo-driven
reaction is clearly benefited
from the un-limited solar energy.
• An efficient photoreactor with
high-photoactivity catalyst is
essential step toward a
commercial-scale application to
produce renewable fuels.
References
• Photoreduction of CO2 to fuels under
sunlight using optical-fiber reactor
The-Vinh Nguyen1, Jeffrey C.S. Wu
Department of Chemical Engineering,
National Taiwan University, Taipei 10617,
Taiwan, ROC Received 24 September 2007;
received in revised form 10 January 2008;
accepted 20 February 2008 Available
online 18 April 2008
• Scientists Use Sunlight to Make Fuel From CO2
http://www.redicecreations.com/article.php?id=2611
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