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《Journal of Energy Chemistry》 2013年03期
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Regeneration of C_4H_(10) dry reforming catalyst by nonthermal plasma

Y.S.Mok  E.Jwa  Y.J.Hyun  
【摘要】:正Carbon deposition via coke formation is one of the critical problems causing catalyst deactivation during the reforming of hydrocarbons.An effort was made to regenerate the catalyst(Ni/7-alumina) by oxidation methods.Two approaches were carried out for the regeneration of the deactivated catalyst.The first one involves the plasma treatment of the deactivated catalyst in the presence of dry air over a temperature range of 300~500℃,while the second one only the thermal treatment in the same temperature range.The performance of the regenerated catalyst was evaluated in terms of C_4H_(10) and CO_2 conversions and the physicochemical characteristics were examined using a surface area analyzer,an elemental analyzer,scanning electron microscopy(SEM) and transmission electron microscopy(TEM).It was observed that the carbon deposit (coke) on the catalyst was about 9.89 wt%after reforming C_4H_(10) for 5 h at 540℃.The simple thermal treatment at 400℃reduced carbon content to 6.59 wt%whereas it was decreased to 3.25 wt%by the plasma and heat combination.The specific surface area was fully restored to the original state by the plasma-assisted regeneration at 500℃.As far as the catalytic activity is concerned,the fresh and regenerated catalysts exhibited similar C_4H_(10) and CO_2 conversion efficiencies.

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