多孔镍/白云石颗粒对生物质气化焦油裂解的催化性能

通过添加镍的方法，改善多孔白云石颗粒对生物质气化焦油裂解的催化能力。采用配位沉淀法制备Ni/白云石粉末，再以Ni/白云石粉末为原料，制备多孔Ni/白云石颗粒。以苯为生物质气化焦油的模型成分，在Ni/白云石颗粒固定床对苯进行蒸汽重整，考察了多孔Ni/白云石颗粒制备过程中，焙烧温度和氧化镍含量等条件对其催化能力的影响。结果表明，多孔Ni/白云石颗粒的催化能力随焙烧温度和氧化镍含量而变化,在焙烧温度750 ℃和氧化镍质量分数13.5%的条件下，Ni/白云石颗粒上苯蒸汽重整的气体收率达到最大值83.0%。在焙烧温度（450～900） ℃和氧化镍质量分数0～22.5%时，积炭率基本保持在4.5%。900 ℃焙烧2 h，对积炭失活的多孔Ni/白云石颗粒进行再生，再生的多孔Ni/白云石颗粒对苯蒸汽重整的催化能力与新鲜多孔Ni/白云石颗粒相同。

Catalytic behaviors of porous Ni/dolomite pellets for decomposition of tar from biomass gasification

Catalytic activity of porous dolomite pellets for decomposition tar from biomass gasification was enhanced via introducing nickel （Ni）. Ni/dolomite powder was prepared via coordinated precipitation method and then formed to porous Ni/dolomite pellets. Steam reforming of benzene （as the model com- pound for tar） was carried out over porous Ni/dolomite pellets in a fixed bed reactor. Effects of calcina- tion temperature and nickel oxide content on catalytic activity of the porous Ni/dolomite pellets were investigated. Maximum gas yield of 83.0% was obtained over porous Ni/dolomite pellets prepared under calcination temperature of 750℃ and with nickel oxide content of 13.5% （mass fraction）. Coke formation rate was almost constant at 4.5% when the catalyst was prepared under calcination temperature of （450 -900）℃ and with nickel oxide content of 0 -22.5%. The coked porous Ni/dolomite pellets were regenerable by calcination at 900℃ for 2 h, with catalytic activity similar to that of fresh pellets.