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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Tunable catalytic activities and selectivities of metal ion doped TiO_2 nanoparticles - oxidation of organic compounds
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Tunable catalytic activities and selectivities of metal ion doped TiO_2 nanoparticles - oxidation of organic compounds

机译:掺杂金属离子的TiO_2纳米粒子的可调催化活性和选择性-有机化合物的氧化

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A series of metal ion doped TiO_2 nanoparticles (M-TiO_2, M = Cr~(3+), Mn~(2+), Fe~(3+), V~(5+), Zn~(2+), Ni~(2+), Ag~+, Cu~(2+) and Co~(2+)) were prepared by a facile co-precipitation approach and characterized by means of ICP-AES, N2 adsorption-desorption isotherms, XRD, TEM and HRTEM. Their catalytic performance was investigated via the oxidation of organic compounds. The variation of metal ion species and doping contents allowed tuning the catalytic properties of the M-TiO_2. Among them, the catalyst Cu-10 displayed excellent activity (97.5%) in the oxidation of styrene and the selectivity of benzaldehyde was as high as 99.4%. Surprisingly, the product distribution of styrene oxidation experienced a reverse trend over the Co-TiO_2 catalysts with different doping amounts of cobalt ions: Co-10 was in favor of forming benzaldehyde (80.2% selectivity), in contrast with Co-15, which produced styrene oxide as the dominant product (84.7% selectivity). The M-TiO_2 catalysts also showed catalytic activities for the oxidation of benzyl alcohol and toluene to generate chlorine-free benzaldehyde in excellent selectivities (>99%).
机译:一系列金属离子掺杂的TiO_2纳米粒子(M-TiO_2,M = Cr〜(3+),Mn〜(2+),Fe〜(3+),V〜(5+),Zn〜(2+),采用简便的共沉淀法制备了Ni〜(2 +),Ag〜+,Cu〜(2+)和Co〜(2+),并通过ICP-AES,N2吸附-脱附等温线,XRD对其进行了表征。 ,TEM和HRTEM。通过有机化合物的氧化研究了它们的催化性能。金属离子种类和掺杂含量的变化可以调节M-TiO_2的催化性能。其中,催化剂Cu-10在苯乙烯的氧化中表现出优异的活性(97.5%),苯甲醛的选择性高达99.4%。出乎意料的是,在钴离子掺杂量不同的情况下,苯乙烯氧化产物的分布与Co-TiO_2催化剂相比出现了相反的趋势:与Co-15相比,Co-10有利于形成苯甲醛(选择性为80.2%)。苯乙烯氧化物为主要产物(选择性为84.7%)。 M-TiO_2催化剂还显示出催化活性,可用于苯甲醇和甲苯的氧化,以极好的选择性(> 99%)生成无氯的苯甲醛。

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