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在微波辐射加热下用不同金属离子(Al3+、Ti4+、Fe3+)对Hβ分子筛进行改性,并将其用于催化苯与苯酐合成蒽醌。采用XRD、NH3-TPD和吡啶-IR对分子筛进行了表征。结果表明,微波辐射加热能提高分子筛的改性效率,改善其催化性能,且对分子筛晶体结构没有破坏作用。不同金属离子改性分子筛的催化效果差别很大,其中,0.5 mol/L的Al2(SO4)3溶液改性的Hβ分子筛催化效果最好,蒽醌产率38.87%,选择性92.78%。分子筛的表面酸性质对其催化性能有较大影响,催化剂表面的中强度酸是催化活性中心,L酸量与B酸量的比值对分子筛的催化性能有重要影响。
Hβ zeolite was modified with different metal ions (Al3 +, Ti4 +, Fe3 +) under microwave irradiation and used for the synthesis of anthraquinone from benzene and phthalic anhydride. The molecular sieves were characterized by XRD, NH3-TPD and pyridine-IR. The results show that microwave radiation can improve the molecular sieve modification efficiency, improve its catalytic performance, and the molecular structure of the molecular sieve has no disruptive effect. Among them, 0.5 mol / L Al 2 (SO 4) 3 solution modified Hβ zeolite had the best catalytic activity with anthraquinone yield of 38.87% and selectivity of 92.78%. The surface acidity of molecular sieve has a great influence on its catalytic performance. The medium acidity on catalyst surface is the center of catalytic activity. The ratio of L acid to B acid has an important influence on the catalytic performance of molecular sieve.