作　　者： ; ; ; ;

机构地区： 南京工业大学化学化工学院材料化学工程国家重点实验室

出　　处： 《工业催化》 2009年第10期45-50,共6页

摘　　要： 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 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.

关 键 词： 催化化学 生物质气化 焦油裂解 苯蒸汽重整 白云石 氧化镍催化剂

领　　域： [理学] [理学] [动力工程及工程热物理]