《Table 5 Evolution of pe rce ntage of che mical familie s pre se nt in bio-oil from flax shive s sam

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《Production of liquid bio-fuel from catalytic de-oxygenation:Pyrolysis of beech wood and flax shives》

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Several studies investigating the effect of using different catalyst loadings（catalyst-to-biomass ratios）have been published in literatures[13，27，28].The reason behind this is that for heterogeneous catalytic systems，the contact time betw een the catalyst and biomass，or vapour，is an important parameter[31].Therefore，effect of catalyst loading on the composition of the bio-oil w as examined.The Fe-HZSM-5 w ill be taken as case in point；the parameters are listed in Table 4.It should be noted that the nitrogen flow rate used w as500 mL/min and the apparent porosity of Fe-HZSM-5w as 0.61.