Conversion of Green House CO₂ Gas into Useful Hydrocarbon Gasses by Photoreduction Method over TiO₂/SiO₂ from Volcanic Ash

Abstract:

In order to decrease CO₂ level, converting the gas into hydrocarbon fuel gasses has been performed by using photoreduction method under TiO₂/SiO₂ photocatalysis. The silica (SiO₂) for TiO₂/SiO₂ preparation was purified from volcanic ash, that mixed with TiO₂ suspended in water. The photoreduction process of CO₂ was carried out in a batch technique, by exposing CO₂ and water vapor in the presence of TiO₂/SiO₂ photocatalyst with UV lamp for 24 h. The gasses produced from the photoreduction were determined by gas chromatography method. In the research, the effects of HCl and HNO₃ as hydrogen ion supplier were also evaluated. The research results indicate that the photoreduction of CO₂ with the water vapor over the photocatalyst of TiO₂/SiO_{2-volcanic ash} has successfully produced methane and ethylene as fuel gasses, while in the presence of TiO₂ no ethylene was resulted. The methane produced by TiO₂/SiO₂ was observed to be larger than by TiO₂ powder. The content of TiO₂ in TiO₂/SiO₂ with low level strongly influenced the yield of the products. In contrast, the yield was independent on the TiO₂ content in high level. The presence of the acids was found to increase the methane produced , and no ethylene was formed, but instead, methanol was resulted. The effect of HCl was higher than HNO₃.

• Periodical: Materials Science Forum (Volume 901)
• Pages: 154-159
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.901.154
• Online since: July 2017
• Authors: Endang Tri Wahyuni*, Roto Roto, Indra P. Iqbah
• Keywords: CO₂, HCl, HNO₃, Methane, Photoreduction, TiO₂/SiO₂, Volcanic Ash

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