Research Institute of Petroleum Industry (RIPI) Journal of Petroleum Science and Technology 2251-659X 5 1 2015 03 01 Catalytic and Non-catalytic Conversion of Methane to C2 Hydrocarbons in a Low Temperature Plasma 69 78 444 10.22078/jpst.2015.444 EN Hamid Reza Bozorgzadeh Research of Industrial petroleum Institute (RIPI) 0000-0002-3437-679X Journal Article 2013 09 28 <span style="font-family: Calibri;"><span style="font-size: medium;">The direct conversion of methane to C</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> hydrocarbons, in a quartz tube reactor enforced by a DC corona discharge, was investigated at atmospheric pressure. The process was carried out in the presence of metal oxide catalysts of Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">, Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> (tetraethyl orthosilicate, TEOS), and Mn/W/CNT (supported on carbon nanotubes). The total yield to C</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> hydrocarbons in the presence of metal oxide catalysts in plasma environment was in the order of Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">> Mn/W/SiO</span>_{<span style="font-size: medium;">2 </span>}<span style="font-size: medium;">/ TEOS> </span><span style="font-size: medium;">Plasma only> Mn/W/CNT. The order changes to Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">>Mn/W/CNT>Plasma only> Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">/ TEOS, when the selectivity and yield of ethylene is considered. The highest yield to C</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> hydrocarbons was 15.8%, which was obtained by using Mn/W/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> in combination with gas</span><span style="font-size: medium;"> discharge plasma without external heating; it was lower when the same feed composition was tested over this catalyst at 825 °C. The catalyst Na</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">WO</span>_{<span style="font-size: medium;">4</span>}<span style="font-size: medium;">/Mn</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">O</span>_{<span style="font-size: medium;">3</span>}<span style="font-size: medium;">/SiO</span>_{<span style="font-size: medium;">2 </span>}<span style="font-size: medium;">–b1, which produces the least carbon oxides, gives rise to the highest production of higher hydrocarbons and ethylene. Catalysts Na</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">WO</span>_{<span style="font-size: medium;">4</span>}<span style="font-size: medium;">/Mn</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">O</span>_{<span style="font-size: medium;">3</span>}<span style="font-size: medium;">/SiO</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;"> /TEOS-b2 and Na</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">WO</span>_{<span style="font-size: medium;">4</span>}<span style="font-size: medium;">/Mn</span>_{<span style="font-size: medium;">2</span>}<span style="font-size: medium;">O</span>_{<span style="font-size: medium;">3</span>}<span style="font-size: medium;">/</span></span><span style="font-size: medium;">‍</span><span style="font-family: Calibri;"><span style="font-size: medium;">CNT-b3,</span><span style="font-size: medium;">due to their high selectivity toward carbon oxides, show low efficiency in producing more valuable hydrocarbons. </span></span> https://jpst.ripi.ir/article_444_550a141f12de6341fba65b0ad0433500.pdf