The Study Of Catalytic Reforming Of Phenol-ethanol To Produce Hydrogen Over Bimetallic Ni-Cu Catalysts Supported On Sepiolite

The aim of this paper is to study the performance of Ni-Cu bimetallic catalysts supported on the modified sepiolite and explore the optimum reaction conditions in fix bed for the steam reforming of phenol-ethanol as the bio-oil compound.Ni-Cu/sepiolite catalysts were prepared by co-precipitation method.The all as-prepared catalysts were characterized by using XRD,H2-TPR,and TEM.The catalytic steam reforming of phenol-ethanol was carried out in fixed bed reactor and the effects of reaction temperature,water to carbon ratio(S/C)and reaction time were investigated.The results showed that the hydrogen production yield of Ni-Cu/SEP catalyst was higher than Ni/SEP and Cu/SEP catalyst during the catalytic reforming process.The optimum technological conditions:reaction temperature 650 ?,range of S/C 8?10,the hydrogen production yield was up to 61.4%.Addition,the Ni-Cu/SEP catalyst showed good stability,without deactivation during 7h on steam.The different Cu/Ni(Cu:Ni = 0:1,0.25:1,0.5:1,0.75:1,1:1,1:0)molar ratios bimetallic catalysts supported on sepiolite were prepared by using the co-precipitation methodand characterized by using XRD,FT-IR,H2-TPR,and TEM.The catalytic performance of bimetallic catalysts and the effect of temperature and steam to carbon ratio was studied.In order to study the life of catalyst,the stability test was carried out and the used catalyst was characterized by XRD,TEM and TGA.The results shown the addition of Cu promoter to Ni/SEP catalyst decreased the particles size,improved metal dispersion and enhanced the redox ability.Specially,the Ni1Cuo0.25/SEP catalyst exhibited the smallest particles(10.2 nm)and highest metal dispersion(8.2%).In steam reforming of phenol-ethanol,the results shown the high temperature was positive for increasing carbon conversion and H2 yield,reaching 83.5%and 67.5%,respectively.In stable test,it found that the Ni1Cu0.25/SEP catalyst exhibited the outstanding stability during 24 h on steam.The spent catalysts after reaction were also characterized and the results shown Ni1Cu0.25/SEP catalyst exhibited the strongest carbon deposition resistance in comparison with Ni1Cu0/SEP and Ni0Cu1/SEP catalysts,suggesting that the formation of Ni-Cu alloy plays an important role in resisting to coke formation.The catalytic steam reforming of phenol-ethanol was carried out in fixed bed reactor and the effects of reaction temperature,water to carbon ratio(S/C)and weight hourly space velocity(WHSV)were investigated.The optimum technological conditions:reaction temperature 650 ?,S/C 8 and WHSV 3.0h-1 the hydrogen production yield was up to 61.4%.