Au, Pd and Rh nanoparticles were supported on Mn/Na 2 Ti 3 O 7 alkaline titanate nanotubes by the deposition–precipitation with NaOH method. The Pt-Mn/NT alkaline titanate showed outstanding catalytic performance accomplishing complete formaldehyde oxidation at 40 °C with apparent activation energy of 27 kJ mol −1 . The following tendency was observed for catalytic activity Pt > Au > Rh. The characterizations revealed the importance of the noble metals in the formation of vacancies and OH groups and their ability to activate the alkaline titanate surface oxygen species, which had an impact on the formation of acid sites (Brönsted and Lewis); another key factor for formaldehyde oxidation was metal dispersion. The presence of OH species facilitated the transformation of formaldehyde adsorbed on the M-Mn/alkaline titanate nanotubes, probably through the reaction with adsorbed O species, which promoted the decomposition of formaldehyde to CO 2 at room temperature. Graphic Abstract

中文翻译：

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负载在锰/碱钛酸盐纳米管上的 Au、Pt 和 Rh 纳米颗粒在室温下甲醛氧化中的性能比较

Au、Pd和Rh纳米颗粒通过NaOH沉积-沉淀法负载在Mn/Na 2 Ti 3 O 7 碱性钛酸盐纳米管上。Pt-Mn/NT 碱性钛酸盐显示出出色的催化性能，在 40 °C 下完成甲醛完全氧化，表观活化能为 27 kJ mol -1 。对于催化活性 Pt > Au > Rh 观察到以下趋势。表征揭示了贵金属在空位和 OH 基团形成中的重要性及其激活碱性钛酸盐表面氧物质的能力，这对酸性位点的形成有影响（Brönsted 和 Lewis）；甲醛氧化的另一个关键因素是金属分散。OH 物质的存在促进了吸附在 M-Mn/碱性钛酸盐纳米管上的甲醛的转化，可能是通过与吸附的 O 物质反应，促进甲醛在室温下分解为 CO 2 。图形摘要