CONVERSION OF METHANE TO METHANOL BY PHOTOCATALYTIC TECHNOLOGY USING TITANIUM DIOXIDE (TIO2)-BASED PHOTOCATALYST
Methane gas (CH4) is one of the greenhouse gases that causes global warming. Methane is stable dan non-reactive, so it generally requires very high pressure dan temperature to react it. Photocatalytic technology can carry out thermodynamically difficult reactions at ambient conditions. The use of...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/70710 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Methane gas (CH4) is one of the greenhouse gases that causes global warming.
Methane is stable dan non-reactive, so it generally requires very high pressure dan
temperature to react it. Photocatalytic technology can carry out thermodynamically
difficult reactions at ambient conditions. The use of abundant ight source (UV,
visible and sunlight, methane dan water become an advantage in the photocatalytic
process of converting methane to methanol. Titanium dioxide (TiO2) is the most
widely studied as photocatalyst because it is stable, abundantly available dan has
good photocatalytic capabilities. However, the high bandgap energy (~3.2eV) dan
low visible light absorption lead the modification straregy is an urge to increase
the photocatalytic activity.
This research has succeeded in synthesizing modified catalyst TiO2/TiOF2
heterojunctions by varying the HF precursor volume dan hydrothermal synthesis
temperature. The higher the temperature dan volume of HF, the greater of TiOF2
composition in the composite, with sample name Ti-A (TiO2:TiOF2 = 88:12) dan
Ti-B (TiO2:TiOF2 = 45:55). The presence of TiO2 dan TiOF2 was confirmed from
the XRD dan SEM-EDX result. The ratio between TiOF2 dan TiO2 affects the ability
in absorbing light as observed from UV-vis diffuse reflectance spectroscopy with
bandgap values for Ti-A dan Ti-B 3.25 eV dan 3.3 eV, respectively. The Ti-A dan
Ti-B catalysts have a truncated bipyramidal shape with the percentage of [001]
facet calculated from Raman spectroscopy 52.4% dan 63.8%. respectively.
The effect of the catalyst, electron scavenger (FeCl2) dan H2O2 on the production
of methanol from methane was observed in this study. The results of ANOVA with
a significance level of 0.05 indicate that there are main effects dan interactions of
the factors tested. The best results were obtained in the experiment with Ti-A
catalyst, 15 ml FeCl2 dan 1 mL H2O2, which obtained by 0.7257 ?molh-1gcatalyst
-1.
There is a curvature in this study, indicating that there is an optimum point in the
range of levels tested. The formation of a TiO2/TiOF2 heterojunction with the
appropiate composition is proven to be able to increase the photocatalytic activity
of the TiO2/TiOF2 photocatalyst. |
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