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MgAPO-5 molecular sieves have been synthesized using diethylaminoethanol as the templating agent in a wide range of the MgO/Al2O3 ratio.The samples were characterized by XRD,SEM,solid state NMR,FT-IR and NH3-TPD.Using MgAPO-5 as acidic supports,bifunctional Pt/MgAPO-5 catalysts were prepared for hydrogenation of nitrobenzene to p-aminophenol (PAP).The results showed that the MgO/Al2O3 ratios influenced the Mg content and the acidity of MgAPO-5 samples,thereby greatly affecting the catalytic performance of Pt/MgAPO-5 catalysts.The selectivity to PAP over Pt/MgAPO-5 was dependent on the amount of strong acid sites of MgAPO-5.When the MgO/Al2O3 molar ratio was 0.5,the synthesized MgAPO-5 sample exhibited the largest amount of strong acid and a highest PAP yield of 41.1% was achieved over Pt/MgAPO-5 catalyst.
MgAPO-5 molecular sieves have been synthesized using diethylaminoethanol as the templating agent in a wide range of the MgO / Al2O3 ratio.The samples were characterized by XRD, SEM, solid state NMR, FT-IR and NH3-TPD. Using MgAPO-5 as acidic supports, bifunctional Pt / MgAPO-5 catalysts were prepared for hydrogenation of nitrobenzene to p-aminophenol (PAP). The results showed that the MgO / Al2O3 ratios influenced the Mg content and the acidity of MgAPO- the catalytic performance of Pt / MgAPO-5 catalysts. The selectivity to PAP over Pt / MgAPO-5 was dependent on the amount of strong acid sites of MgAPO-5.When the MgO / Al2O3 molar ratio was 0.5, the synthesized MgAPO-5 sample exhibited the largest amount of strong acid and a highest PAP yield of 41.1% was achieved over Pt / MgAPO-5 catalyst.