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中文摘要：
采用超声辅助的液相沉淀法制备不同La掺杂量的羟基磷灰石催化剂,采用XRD,BET,FT-IR,SEM,EDS和CO2-TPD等手段表征催化剂的结构和表面性质,并考察其在双氧水氧化剂存在下催化苯乙烯环氧化反应的性能.结果表明,随着La的引入,羟基磷灰石晶格中部分Ca2＋被La3＋取代,发生一定程度的晶格畸变,并使表面某些碱性位强度和数量有所增加,当La/（Ca＋La）原子比为0.02时,La掺杂型羟基磷灰石的表面强碱性位数量达到最大,表现出最佳的苯乙烯双氧水环氧化的催化活性,苯乙烯转化率和环氧苯乙烷选择性分别为76.2%和83.5%.La掺杂型羟基磷灰石可多次循环使用,具有较稳定的结构和催化性能.
英文摘要：
A series of lanthanum-doped hydroxyapatite（La-HAP） catalysts were prepared.The physicochemical properties of La-HAP were characterized by X-ray diffraction,Fourier transform inferred spectroscopy,scanning transmission electron microscopy-energy dispersive spectroscopy and CO2 temperature-programmed desorption.The catalytic activity of La-HAP for the epoxidation of styrene was investigated with H2O2 as an oxidant.The results indicated that with the introduction of La dopant,some Ca2＋ in hydroxyapatite lattice were replaced by La3＋,resulting in a lattice distortion and an increase in strength and quantity of surface base.The La-HAP catalyst with a La/（Ca＋La） atomic ratio of 0.02 exhibited a maximum number of strong basic sites and provided the highest catalytic activity with 76.2% styrene conversion and 83.5% selectivity to epoxide.Such La-HAP catalyst could be reused several times with considerable stabilities in structure and performance.
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