Effects of W loading amounts on catalytic performances of Ni-W bimetallic catalysts for CH4-CO2 reforming reaction
CH4-CO2 reforming reaction is a technology for achieving CO2 resource utilization.During CH4-CO2 reforming reaction process,the sintering and carbon deposition of catalysts are the main factors restricting their industrialization.A series of Ni-W bimetallic catalysts were synthesized using the solid-state grinding method.The texture properties,phase compositions,number of active sites,and carbon deposition of the catalysts were analyzed by BET,XRD,H2-TPR,H2-TPD,XPS,TG-DTA and Raman.The effects of different W loading amounts(mass fraction)on catalytic performances and anti-carbon deposition performances of catalysts were evaluated.Compared with monometallic Ni-based catalysts,the introduction of W significantly reduces the particle size of the active component.However,with the increase of W loading,the particle size of the active component increases and the number of active sites significantly decreases in Ni-W bimetallic catalysts.Among them,the initial activity of the Ni2W/SBA-15 is the highest.At 700℃and 30000 mL/(g·h),the conversion rates of CH4 and CO2 are 58%and 66%,respectively.The TG-DTA results show that the Ni6W/SBA-15 produces the least amount of carbon deposition,which is 3.67%after 1450 min.
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