III International Conference

PP-I-80INFUENCE OF CHEMICAL TREATMENT AND PROCESS CONDITIONS ONCATALYTIC PROPERTIES OF NANOFIBROUS CARBON IN H 2 S DIRECTOXIDATIONShinkarev V.V., Kuvshinov G.G. 1 , Kuvshinov D.G. 2Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia1 Novosibirsk State Technical University, Novosibirsk, Russia2 Queen's University Belfast, Northern Ireland, UKE-mail: kuvshinov_g@mail.ruThe influence of chemical pretreatment, water vapour content and oxygen excess oncatalytic characteristics of nanofibrous carbon in direct hydrogen sulfide oxidation reactionhave been investigated. It was shown, that preliminary acid treatment as well as water vapourexcess in reaction mixture improved selectivity and stability of nanofibrous carbon.Nanofibrous carbon can work efficiently in wide range of oxygen excesses.Importance of the efficient catalysts design for the direct selective oxidation of hydrogensulfide into sulfur and water is caused by wide application of the direct oxidation in newtechnologies for gas purification from hydrogen sulfide and the improvement of the currenttechnologies. This is for example SuperClaus process [1] and others, providing thepurification of low-concentrated waste gases from hydrogen sulfide by its selective oxidationwith molecular oxygen to yield sulfur and water at the last step. At present this process isperformed in the presence of supported metal oxide catalysts such as ICT-27-42 [2] andothers. Unfortunately, these catalysts exhibit insufficient activity at temperatures below 200 o Cand tend to activity or selectivity decreasing in the presence of water vapour and oxygenexcess. Nanofibrous carbonaceous materials (NFC) produced by hydrocarbons decompositionwith 8-group metals catalysts are the materials of the new class and can be applied in variousspheres. Recently the unique properties of NFC have been revealed. NFC can catalyze thereaction of selective molecular oxygen oxidation of hydrogen sulfide [3].The goal of this research was to find the influence of chemical pretreatment, water vapourcontent and oxygen excess on catalytic characteristics of nanofibrous carbon in directhydrogen sulfide oxidation reaction.The NFC samples were obtained in the result of decomposition of methane over nickelcontainingcatalysts at the temperature 550 o C in the form of mesoporous granules ofdiameters about 3 mm, which consist of tightly twisted graphite-like fibers of diameters of150