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首页> 外文期刊>RSC Advances >TiO2 nanoparticles vs. TiO2 nanowires as support in hydrogen peroxide direct synthesis: the influence of N and Au doping
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TiO2 nanoparticles vs. TiO2 nanowires as support in hydrogen peroxide direct synthesis: the influence of N and Au doping

机译：TiO2纳米颗粒与TiO2纳米线作为过氧化氢直接合成的支持：N和Au掺杂的影响

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The performance of Pd on titania support were evaluated in the direct synthesis of hydrogen peroxide. The equipment used was a high pressure, semi-batch apparatus equipped with a special injection system. Pd (1 wt%) catalysts on TiO _(2) materials with different nature were prepared by wet impregnation method. Three aspects were investigated: (a) the structure of the support (nanoparticles vs. nanowires); (b) the addition of a second active metal (Au); (c) the influence of N-doping of the support. All samples were characterized by means of XPS, TEM and XRD analyses. TiO _(2) nanoparticle supported catalyst demonstrated higher H _(2) O _(2) selectivity and higher turnover frequency (TOF) than the catalysts based on TiO _(2) nanowires. The addition of Au to the Pd TiO _(2) nanowire catalyst improved the H _(2) O _(2) selectivity due to altered particle size and electronic effects. Both N-doped versions of the catalysts gave rise to higher H _(2) O _(2) selectivity than the parent non-doped ones. The synthetic procedure was the source of this observation: larger mean Pd nanoparticles were present, thus favouring the formation of H _(2) O _(2) as the primary product.
机译：在过氧化氢的直接合成中评估了PD对二氧化钛支持的性能。所用设备是配备特殊注射系统的高压，半批量设备。通过湿浸渍法制备具有不同性质的TiO _（2）材料上的Pd（1wt％）催化剂。研究了三个方面：（a）载体的结构（纳米颗粒与纳米线）; （b）添加第二种活性金属（Au）; （c）N-掺杂载体的影响。通过XPS，TEM和XRD分析来表征所有样品。 TiO _（2）纳米颗粒负载催化剂比基于TiO _（2）纳米线的催化剂显示出更高的H _（2）o o _（2）选择性和更高的周转频率（TOF）。由于改变的粒度和电子效应，将AU添加到Pd TiO _（2）纳米线催化剂的选择性改善H _（2）O _（2）选择性。催化剂的N掺杂版本的两个掺杂版本使得比母体非掺杂物更高的H _（2）O _（2）选择性。合成程序是该观察的来源：存在较大的平均Pd纳米颗粒，从而有利于形成H _（2）O _（2）作为初级产物的形成。

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