چكيده به لاتين
Abstract:
Steam reforming of methane is an endothermic equation which used for production of syngas with H2/CO ratio of 2 or three or higher that is suitable for production of hydrogen. Experiment are done in two stages which in both stages catalysts are made by sequential impregnation techniques. In first stage 10%Ni/Al2O3 , 10%Ni-3%Mg/Al2O3 ,10%Ni-3%Ba/Al2O3 were made. In the following the prepared catalysts analysed for investigation of presence of Mg and Ba metals and comparing with monometalice catalyst. In next stage for scrutiny of effect of interaction of Mg, Ba, Ni metal on alumina support we used a taguchi design of experiment with a 9 series of experiment of this catalysts. For investigation of catalysts we used XRD , BET and TGA analysis and also reactor test. The presence of Ba metal show good stability to catalyst and presence of Mg metal make good activity for catalyst and presence of both metals in same time in catalyst in 10%Ni-3%Mg-5%Ba/Al2O3 load show favourable result in steam reforming of methan. The stability of the catalysts was evaluated in 750℃ and atmospheric pressure for steam reforming of methane, as the most important reaction for production of syngas, in a fixed bed reactor. All of the catalysts showed stability in 6h. The effect of temperature, S/C ratio and GHSV were investigated. 10%Ni-3%Mg-5%Ba/Al2O3 catalysts exhibited the best catalytic performance (XCH4(%)≅89.2 at750℃, S/C=2.5and GHSV=34000 ml/(g.h)). Results were accordance with XRD and BET characterization tests. The smaller particles, better dispersion, larger specific area and pore volume leads to the better performance for 10%Ni-3%Mg-5%Ba/Al2O3 catalyst.
Keywords: Steam reforming of methane, nickel alumina, promoter,impregnation and coking