Fe2O3/Al2O3氧载体化学链制氢联合甲烷干重整制备氢气和合成气

Syngas and Hydrogen Co-production on Fe2O3/Al2O3 Oxygen Carrier via Chemical Looping Hydrogen Generation Process With Methane Dry Reforming

化学链制氢联合甲烷干重整由还原、甲烷干重整、蒸汽氧化和空气氧化四个反应器组成,是一种连续的CO2回收、氢气和合成气制备的新方法。在小型流化床实验台中,研究温度和CO2/CH4比对Fe2O3/Al2O3载氧体甲烷干重整、制氢和循环特性的影响。结果显示:还原后的Fe2O3/Al2O3载氧体具有优秀的甲烷干重整催化特性。CO2/CH4比为1时,甲烷干重整存在轻微的积碳,制氢纯度超过99%。十次循环后,载氧体发现轻微烧结,甲烷转化率保持稳定,二氧化转化率呈缓慢下降的趋势。

A novel chemical looping process was introduced by combining chemical looping hydrogen generation and dry reforming of methane(CLHD) on a cost-effective iron-based oxygen carrier to produce high-purity syngas and hydrogen simultaneously.Four different reactors were contained in this proposed chemical looping process,i.e.reduction reactor,methane dry reforming reactor,steam oxidation reactor and air oxidation reactor.In this study,Fe2O3/Al2O3 oxygen carrier was synthesized by a coprecipitation route,and the influences of the CO2/CH4 ratio on the performance of methane dry reforming,hydrogen purity and redox stability were investigated in a fluidized bed reactor.It can be seen from the experimental results that the reduced Fe2O3/Al2O3 oxygen carrier shows a good catalytic activity on dry reforming of methane.Since the reaction temperature was 900℃ and the ratio of CO2/CH4 was 1,slightly deposited carbon formed in the dry reforming period,which created the purity of hydrogen exceeds 99% in the next steam oxidation period.After 10 cycles,slight sintering of oxygen carrier was observed.The methane conversion kept stable along with cycles while the conversion of carbon dioxide decreased slowly.