NiO-doped Au/Ti-powder: A catalyst with dramatic improvement in activity for gas-phase oxidation of alcohols

NiO-doped Au/Ti-powder: A catalyst with dramatic improvement in activity for gas-phase oxidation of alcohols
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NiO 掺杂的 Au/Ti 粉末:一种显着提高醇气相氧化活性的催化剂

DOI:
10.1016/j.apcata.2013.07.005
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发表时间:
2013-10
期刊:
Applied Catalysis A: General
影响因子:
--
通讯作者:
Yong Lu
Yong Lu
中科院分区:
其他
文献类型:
--
作者:
Huanyun Hu;Zhen Jiang;Shuo Zhang;Yong Lu

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采用Au/ ti粉(Au: 35 ~ 40 nm)掺杂NiO制备了一种活性稳定的NiO@Au/ ti粉催化剂,用于醇类气相氧化。发现金颗粒部分被微小的NiO片段覆盖,形成特定的NiO@Au集合,从而导致在280°C下苯甲醇氧化的转化率从仅~ 5%(未掺杂NiO)提高到~ 94%。此外,环丙基甲醇的选择性氧化可以在280°C的催化剂上进行,在整个300 h的测试中,选择性为94%,转化率为72-80%。利用x射线光电子能谱(XPS)和x射线吸收光谱(XAS)鉴定了NiO@Au系综上Ni2O3-Au+的杂化活性位点。
An active and stable NiO@Au/Ti-powder catalyst, which can be obtained by doping Au/Ti-powder (Au: 35–40 nm) with NiO, has been developed for the gas-phase oxidation of alcohols. Gold particles are found to be partially covered with tiny NiO segments to form specific NiO@Au ensembles thereby leading to a dramatic conversion improvement from only ∼5% (without NiO doping) to ∼94% for the benzyl alcohol oxidation at 280 °C. Additionally, the selective oxidation of cyclopropyl carbinol can proceed over this catalyst at 280 °C with a selectivity of 94% and a conversion of 72–80% throughout the entire 300 h test. The hybrid active-sites, Ni2O3-Au+, on the NiO@Au ensemble are identified using X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS).
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