SOLAR-DRIVEN PHOTOCATALYTIC CO2 CONVERSION TO METHANOL USING N-DOPED TIO2
Carbon dioxide is a greenhouse gas which is harmful to the environment and to human’s life whose emission have always been increasing. Photocatalytic technology is one of the technologies utilized for reducing carbon dioxide emissions which has high potential due to the technology’s ability to co...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/67465 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Carbon dioxide is a greenhouse gas which is harmful to the environment and to human’s
life whose emission have always been increasing. Photocatalytic technology is one of the
technologies utilized for reducing carbon dioxide emissions which has high potential due
to the technology’s ability to convert carbon dioxide into value added chemicals like
methanol. Titanium Dioxide (TiO2) is a photocatalyst that has been widely used however
TiO2 has a quite large band gap ranging from 3,0 to 3,2 eV which can only be active in
the UV spectrum region. This drawback can be overcome using several methods, one of
those methods is nitrogen doping which can reduce the band gap and improve
photocatalytic activity in the visible light region.
The aim of this research is to synthesize nitrogen doped TiO2 to convert CO2 to methanol.
The photocatalyst will then be characterized which comprises of measuring crystallinty
using X-ray Diffraction (XRD), measuring morphology of catalyst using Scanning
Electron Microscope (SEM), measuring the band gap energy using UV-vis diffuse
reflectance spectroscopy (UV-vis DRS), and measuring the surface area and pore
diameter using Braunanear, Emmelt, dan Teller (BET). Variation to find the optimum
condition of photocatalysis includes varying the pH and the N/Ti molar ratio. The
photocatalytic process will be conducted in a batch reactor for 3 hours. The product will
then be analysed using gas chromatography to confirm the presence of methanol
The results of this research are the photocatalyst is the anatase phase with a crystal size
range of 83.5 to 91 nm through XRD results. UV-vis DRS results show that the
photocatalysts doped with nitrogen has an extended light absorption and a band gap of
2,93 eV for N-TiO2 3%. BET results show that the N-TiO2 2% photocatalyst has the
highest surface area of 120 m2/g. SEM results show that there is agglomeration of
particles where the particle size range is 294 to 303 nm. The methanol concentration in
the product is highest at pH 10 with N-TiO2 2% having the highest yield at 0.065
mol/g.cat. |
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