Hydrothermal synthesis of γ-Al2O3 support and its hydrogenation performance
Ammonium aluminum carbonate hy-droxide(A ACH)as the precursor of y-Al2O3 was hy-drothermally synthesized from ρ-Al2O3 and ammoni-um bicarbonate.The influences of reactants ratio and reaction time on the synthetic product were investi-gated.Supports obtained from two different precursor samples were characterized by X-ray diffractometer,physical adsorption analyzer,and chemical adsorp-tion analyzer.The hydrodesulfurization and hydro-denitrification performance of corresponding cata-lysts were evaluated.The results showed that rod-like AACH with high crystallinity could be synthe-sized under the condition of the HCO3-to Al3+mole ratio of 1.5∶1.0 at 100 ℃ for 14 h.Compared with the support prepared by traditional pseudo boehmite,the support prepared by AACH had higher specific surface area and larger pore volume,the proportion of pore volume with effective pore size(4-10 nm)was higher,and more medium-strong acid was con-ducive to the reaction.And the desulfurization and denitrification activity of the prepared catalyst was better.
ammonium aluminum carbonate hy-droxidepseudo-boehmiteγ-Al2O3hydrothermal reactionhydrofining catalystdesulfurization and denitrification performance
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