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Selective side-chain oxidation of alkyl-substituted aromatics on TiO2 partially coated with WO3 as a photocatalyst

机译:烷基取代芳香族剂的选择性侧链氧化在TiO2上部分涂在WO3中作为光催化剂

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摘要

TiO2 particles partially coated with WO3 (WO3/TiO2) were used as photocatalysts for selective oxidation of toluene to benzaldehyde with molecular oxygen (O2) under photoirradiation at λ > 300 nm. The catalysts loaded with 8-10 wt% WO3 exhibit very high oxidation activity and produce benzaldehyde with ca. 50% selectivity, which is the highest selectivity among the photocatalytic systems reported so far. This is achieved because subsequent photocatalytic decomposition of the formed benzaldehyde is suppressed on the catalysts. On the photoactivated WO37TiO2, the exposed TiO2 surface behaves as the oxidation site, whereas the WO3 surface is much less active for oxidation. The WO3 loading decreases the amount of benzaldehyde adsorbed onto the TiO2 surface. This thus suppresses photocatalytic decomposition of benzaldehyde on the TiO2 surface, resulting in high benzaldehyde selectivity. The WO3/TiO2 catalyst successfully promotes side-chain oxidation of several kinds of alkyl-substituted aromatics and selectively produces aldehydes and ketones.
机译:在λ> 300 nm的光片化下,将用WO3(WO3/TIO2)部分涂覆的TIO2颗粒用作光催化剂,以选择性氧化甲苯和分子氧(O2)。装有8-10 wt%WO3的催化剂表现出很高的氧化活性,并用Ca产生苯甲醛。 50%的选择性,这是到目前为止报告的光催化系统中最高的选择性。这是因为随后在催化剂上抑制了形成的苯甲醛的光催化分解。在光活化的WO37TIO2上,暴露的TiO2表面表现为氧化位点,而WO3表面的氧化活性却大大降低。 WO3载荷减少了吸附在TiO2表面上的苯甲醛的量。因此,这抑制了苯甲醛在TiO2表面上的光催化分解,从而导致高苯甲醛选择性。 WO3/TIO2催化剂成功促进了几种烷基取代芳香族剂的侧链氧化,并有选择地产生醛和酮。

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