Experimental Study On The Characteristics Of Catalytic Reforming Of Corn Straw Pyrolysis Gas To Synthetic Gas

Using biomass pyrolysis or gasification to produce syngas can make full and effective use of a large number of biomass resources,and at the same time can alleviate the increasingly tense energy crisis to a certain extent.However,the quality of traditional biomass pyrolysis gasification products is not high,and the content of tar and carbon dioxide is high,which not only makes the gasification efficiency of the plant lower,but also has a negative impact on syngas.For this reason,the project team made a closed-cycle biomass catalytic reformer to reduce the greenhouse gas(CH4+CO2)in syngas.A series of catalysts,including gamma-Al2O3,SiO2,TiO2 and ZSM-5,were prepared by isovolumetric impregnation method.The nickel loading was 10%and the copper content was 3%.The nickel loading was 5%.7.5%.10%,12.5%,15%with gamma-Al2O3 as the carrier,and the copper loading was 3%.The catalytic weight was carried out on the closed-cycle biomass pyrolysis catalytic reformer using corn straw as raw material.The effects of nickel loading,reaction temperature,mass ratio of water vapor to corn straw(S/B)and mass ratio of catalyst to corn straw(C/B)on the synthesis of syngas by catalytic reforming of corn straw were investigated.The catalysts were characterized by XRD.H2-TPR and SEM,and the results were as follows:When the catalytic furnace and pyrolysis furnace are both at 800 C,S/B is 0.5 and C/B is 0.5,the cycles of nickel-based catalysts supported by gamma-Al2O3,SiO2,TiO2 and ZSM-5 with nickel loading of 10%are compared.The experimental results show that under cyclic conditions,the content of greenhouse gas(CH4+CO2)can be significantly reduced,while the content of syngas(H2+CO)can be increased and the gas yield can be increased.Carbon conversion and gasification efficiency.The catalyst loading,reaction temperature,mass ratio of water vapor to corn straw(S/B)and mass ratio of catalyst to corn straw were investigated under cyclic conditions.The experimental results show that among the supported nickel-based catalysts prepared,the supported nickel-based catalysts supported on gamma-Al2O3 have the best activity with 10%nickel loading;when the reaction temperature is 850 C,S/B is 1,C/B is 0.5,H2/CO in syngas is 1.41,the greenhouse gas content(C02+CH4)is 20.39%,and the carbon conversion rate is 86.07%;the gas production rate of the unit is 1.15Nm3/Kg,and the gasification efficiency is 79.61%.The catalyst supported on gamma-Al2O3 was characterized by XRD,H2-TPR and SEM with 10%nickel loading.The results show that nickel-based catalysts supported on gamma-Al2O3 have good dispersibility,because NiO and support exist in the form of compounds and therefore have high dispersibility.