磁稳定床催化重整生物质焦油模型化合物甲苯

Catalytic reforming of biomass tar modeling compound toluene in magnetic stabilized bed

使用一种由磁场辅助控制流化的新型流化床反应体系——磁稳定床来进行生物质焦油模型化合物甲苯的水蒸气催化重整.为达到磁稳定床的效果,采用共沉淀-浸渍两步法,合成出具有磁性的Co-Fe/Al2O3催化剂.通过扫描电子显微镜（SEM）、X-射线衍射（XRD）、N2吸脱附（BET）对催化剂进行表征.对催化剂进行冷态试验,确定其磁稳定床操作区间;之后在同一工况下使用同种催化剂,分别于固定床、流化床、磁稳定床内进行催化活性及稳定性测试;最后使用SEM、热重（TG）对催化剂进行表征,探讨其表面积碳.结果显示：在650℃、载气流量为320m L/min、水蒸气与碳的摩尔比为1.4的工况下,磁稳定床催化效率高达96.4%,高于固定床的82.6%以及流化床的86.6%;同时,磁稳定床与流化床积碳轻微,而固定床催化剂表面积碳较为严重,且有明显烧结现象.

A fluidized bed reaction system with magnetic field assisted control was used in toluene,biomasstar modeling compound,and catalytic reforming process.In order to form a magnetic stabilized bed,a two-step method was used to synthesize a magnetic Co-Fe/Al2O3 catalyst.The chemical and structural properties of catalysts were characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD）,and N2 adsorption/desorption method.The cold experiment of the catalyst was carried out to determine the operation interval of the magnetic stabilized bed, and then the catalytic activity and stability were tested in fixed bed,fluidized bed and magnetic stabilized bed respectively under same catalyst and operating condition.Finally,the catalyst was characterized by SEMand thermogravimetry（TG） to discuss the surface carbon deposition.Results show that under condition of 650 ℃,carrier gas flow rate of 320 mL/min,the molar ratio of water vapor to carbon of 1.4,the catalytic efficiency of magnetic stabilized bed is 96.4%,higher than 82.6% of fixed bed and 86.6% of fluidized bed.Meanwhile,the magnetic stabilized bed and fluidized bed have slightly carbon deposition,while the carbon deposition of catalyst in fixed bed is more serious with obvious sintering.