The Effect of Hydrogenated TiO2 to the Au/TiO2 Catalyst in Catalyzing CO Oxidation,Langmuir

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The Effect of Hydrogenated TiO2 to the Au/TiO2 Catalyst in Catalyzing CO Oxidation
Langmuir ( IF 3.7 ) Pub Date : 2021-03-11 , DOI: 10.1021/acs.langmuir.0c03167
Qi Xiao ₁ , Shuai Wei ₁ , Wei-Wei Wang ₁ , Chun-Jiang Jia ₁

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Supported Au catalysts are widely used for CO oxidation due to their extremely high activity, and the modification of a support structure is a crucial method to improve catalytic performance. Herein, we prepared gold catalysts supported on flaky TiO₂ and on TiO₂ hydrogenated at different temperatures (200, 400, and 600 °C). We found that the sample with the support pretreated in hydrogen at 600 °C (0.5Au/TiO₂-H600) showed the greatest advantages in activity and stability over the sample with as-prepared TiO₂ nanosheets (0.5Au/TiO₂-UC). First, calcination at 600 °C changed the exposed surface of TiO₂ from {001} to {101}, and gold nanoparticles (2–3 nm) were observed as highly reactive species on 0.5Au/TiO₂-H600. Moreover, the increase of oxygen vacancies on the surface of 0.5Au/TiO₂-H600 was conducive to oxygen activation and promoted the catalytic activity. Therefore, we emphasized the important role of the support and gave an effective method to improve the catalytic performance by regulating the support structure.

中文翻译：

氢化TiO ₂对Au / TiO ₂催化剂催化CO氧化的影响

负载的Au催化剂由于其极高的活性而被广泛用于CO氧化，并且载体结构的改性是提高催化性能的关键方法。在本文中，我们制备了负载在片状的TiO金催化剂₂和在TiO ₂在不同温度下氢化（200，400，和600℃）。我们发现，在600°C的氢气中预处理过的样品（0.5Au / TiO ₂ -H600）与在制备的TiO ₂纳米片材（0.5Au / TiO ₂ -UC ）。首先，在600°C下煅烧改变了TiO ₂的暴露表面从{001}到{101}，金纳米粒子（2-3 nm）被观察到在0.5Au / TiO ₂ -H600上具有高反应性。此外，0.5Au / TiO ₂ -H600表面氧空位的增加有利于氧的活化并促进了催化活性。因此，我们强调了载体的重要作用，并给出了通过调节载体结构来提高催化性能的有效方法。

更新日期：2021-03-23

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