Adsorption Desulfurization of Organic Sulfur Compounds in Model Fuels by Ni-Loaded Carbon

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  • Ni担持炭素を用いるモデル燃料中の有機硫黄の吸着脱硫
  • Niタンジタンソ オ モチイル モデル ネンリョウ チュウ ノ ユウキ イオウ ノ キュウチャクダツリュウ

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Abstract

Adsorption desulfurization of several organic sulfur compounds in model fuels (tetralin and n-dodecane) by metal (Co, Ni, Cu, Zn, Pb)-loaded carbons was studied with a batch-type Pyrex glass vessel or stainless autoclave at 25–350°C to develop a novel method of removing the sulfur present in coal extract. The results showed that nickel-loaded carbon (Ni/C) has the highest desulfurization performance, but the adsorption depends on the type of model fuel and the kind of sulfur compound. At ≤200°C, desulfurization was higher in n-dodecane than in tetralin and increased in the order of dibutyldisulfide<hexylsulfide<thiophene<diphenylsulfide<diphenyldisulfide<benzothiophene<dibenzothiophene (DBT)<4,6-dimethydibenzothiophene (4,6-DMDBT). The extent of desulfurization was almost unchanged after the removal of Ni by HCl washing, indicating that the desulfurization at ≤200°C by Ni/C mainly occurs on the C-support and depends strongly on the pore properties. The adsorption of organic sulfur increased remarkably at above 200°C, and the influence of the kind of sulfur compound was the reverse of that at ≤200°C. At 350°C, all sulfur species except 4,6-DMDBT could be removed almost completely. The adsorption of DBT or 4,6-DMDBT increased with holding time at ≥250°C and was larger in tetralin than in n-dodecane. GC-MS analysis following the experiments with DBT revealed the presence of biphenyl, meaning that cleavage of the organic C–S bond in DBT proceeds on Ni/C.

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