《Table 3 Spe cific surface are as and spe cific pore volume s of catalysts use d》

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

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The values obtained for the specific surface area of the catalysts used are listed in Table 3.The BET surface area decreased after metal modifications.This observation is due to the fact that metal species w ere deposited on the catalyst surface during impregnation.For the supported catalysts on alumina，the decrease w as more pronounced because the surface area ofγ-Al2O3w as low er than that of the zeolites and therefore，the dispersion w as probably low er.The nitrogen gas adsorption-desorption isotherms for the same representative catalysts samples as mentioned above are illustrated in Figure 3.The specific pore volume for each analysed sample has been included in Table 3.A slight decrease in the specific pore volume of Fe-HZSM-5 as compared to that of HZSM-5 can be observed，corroboratingtheprevious statement claiming a partial coverage of the HZSM-5 pores by Fe.Concerning the isotherms in Figure 3，HZSM-5，Fe-HZSM-5 and H-Y basically show a combination of IUPAC Types I and IV isotherms[28].Hence，these samples possessed both microporous and mesoporous structures.γ-Al2O3displayed a slightly different isotherm than the others（closer to IUPAC Type III）；this may be due to the smaller surface area ofγ-Al2O3relative to the zeolite-based catalysts，w hich translated to a low er pore volume（0.22 cm3/g）.