This study was conducted to investigate the conditions used to prepare Pt/TiO₂ catalysts via a liquid-phase reduction method and to analyze the room-temperature oxidation characteristics of formaldehyde (HCHO) upon application of the catalysts. We found that the major factors determining the catalyst activity during catalyst preparation were the temperature used in liquid-phase reduction, the Pt/N₂H₄ ratio, and pH, whereas the reduction time and the addition of alkali metal had no significant effect. In addition, compared to the HCHO oxidation performance of catalysts obtained via the general method employed (gas-phase reduction), that of the catalysts obtained via liquid-phase reduction were superior. This result indicates that H₂O significantly contributes to enhancing the catalytic activity when using liquid-phase reduction method-based catalysts as the conversion of HCHO into reaction intermediates is accelerated and the hydroxyl groups serving as adsorption sites are restored.

中文翻译：

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基于液相还原法的Pt / TiO ₂催化剂的制备及HCHO室温氧化反应特性

进行了这项研究以研究通过液相还原法制备Pt / TiO ₂催化剂的条件，并分析了使用催化剂后甲醛（HCHO）的室温氧化特性。我们发现，决定催化剂制备过程中催化剂活性的主要因素是液相还原所用的温度，Pt / N ₂ H _4的比值和pH值，而还原时间和碱金属的添加没有明显影响。另外，与通过常规方法获得的催化剂的HCHO氧化性能（气相还原）相比，通过液相还原获得的催化剂的HCHO氧化性能优异。该结果表明H ₂当使用液相还原法为基础的催化剂时，O大大有助于提高催化活性，因为可加快HCHO向反应中间体的转化，并恢复用作吸附位的羟基。