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Influence of alkali metals on Pd/TiO2 catalysts for catalytic oxidation of formaldehyde at room temperature

机译：碱金属对Pd的影响/二氧化钛催化剂的催化氧化甲醛在室温温度

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摘要

We previously observed that sodium (Na) addition had a dramatic promotion effect on Pd/TiO2 catalysts for formaldehyde (HCHO) oxidation. In this study, a series of alkali metal (Li, Na, K, Cs) doped Pd/TiO2 catalysts were prepared and tested for ambient temperature HCHO oxidation. The results showed that the doped alkali metals have a common promotion effect on the performance of the Pd/TiO2 catalysts for HCHO oxidation under ambient temperature, which followed the order K > Cs > Na > Li. X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), CO chemisorption, Transmission Electric Microscopy (TEM), temperature-programmed reduction by H-2 (H-2-TPR), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption by O-2 (O-2-TPD) methods were used to characterize the alkali metal doped catalysts to investigate the mechanism of the alkali metal promotion effect. The results showed that a negatively charged and well-dispersed Pd species was induced and stabilized by alkali metal addition, which facilitates the activation of chemisorbed oxygen, and then enhances the performance of alkali metal doped Pd/TiO2 catalysts for room temperature HCHO destruction. The K-Pd/TiO2 catalyst in particular possessed the highest Pd dispersion degree with active sites, attributing to the best activity in ambient temperature HCHO oxidation.
机译：我们以前观察到钠(Na)有一个戏剧性的提升影响Pd /二氧化钛吗催化剂对甲醛氧化(一氧化碳)。这项研究中,一系列的碱金属(Li Na, K,Cs)掺杂Pd /二氧化钛催化剂和准备测试环境温度一氧化碳氧化。结果表明,掺杂碱金属有一个共同的促销影响性能Pd /二氧化钛催化剂的一氧化碳氧化环境温度,随后订单K >Cs >南>。Brunauer-Emmett-Teller (BET)有限公司化学吸收作用,透射电子显微镜(TEM),程序升温还原的2(H-2-TPR)、x射线光电子能谱(XPS)和程序升温解吸坐坐(O-2-TPD)方法被用来描述碱金属掺杂催化剂调查机制的碱金属促销效果。结果表明,带负电的说法是诱导和Pd物种稳定的碱金属,促进化学吸附氧的活化,然后提高碱金属的性能掺杂Pd /二氧化钛催化剂室温一氧化碳破坏。拥有最高的Pd分散度活跃的网站,将最好的活动环境温度一氧化碳氧化。

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