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HZSM-5 zeolite was employed in the upgrading of biomass pyrolysis vapors in this study. The coking characteristics were investigated by means of TG, FT-IR, XRD, N2 adsorption–desorption, NH3-TPD, Py-IR, SEM and TEM methods. When the zeolite was used for three times about 120min, its activity had been lost and the amount of coke was 12.15% composed of 9.90% of I type filamentous coke and 2.25% of II...
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