【摘要】 生物油轻质组分中水的质量分数高达85%,除水困难,弃之浪费又造成污染.采用水相重整的方法可充分利用这部分物质,得到宝贵的氢气资源.实验室以Pt/Al2O3为催化剂,可得到757mL的气体,并且氢气的体积分数高达65.86%.由于Pt为贵金属催化剂,研究其在反应过程中的稳定性非常必要.为此,对反应后的催化剂进行了XRD、TEM、SEM和TPO表征,发现其性质发生了较大的改变.将催化剂煅烧处理后进行重复试验,发现其催化活性和对氢气的选择性均明显下降,即Pt/Al2O3在生物油轻质组分水相重整制氢反应体系中的稳定性较差,难以重复利用.更多还原

【Abstract】 The low-boiling fraction(LBF)of bio-oil contains about 85% water,which is difficult to remove completely.Nevertheless,abandoning it is not only a waste but also a pollutant to our environment.Then,aqueous-phase reforming(APR)is a promising way to categorise it as resource rather than waste.Using Pt/Al2O3 as catalyst,757 mL gas product was gained and at the same time the selectivity of H2 reached 65.86%.Considering the high price of Pt,it was necessary to study the stability of Pt/Al2O3 during this reaction.The used catalyst was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),scan electron microscope(SEM)and temperature programmed oxidation(TPO).It demonstrated that after reaction the properties of catalyst changed a lot.After calcining in air,the recycle use of catalyst was tested.However,the catalytic activity and selectivity of H2 dropped down substantially for subsequent APR runs.That is to say,the stability of Pt/Al2O3 is poor during APR of LBF.更多还原