Kinetics and Mechanism of the Reaction between H2O2 and Tungsten Powder in Water

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• 作者：Miao Yang ; Xian Zhang ; Alex Grosjean ; Inna Soroka ; Mats Jonsson
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 1, 2015
• 年：2015
• 卷：119
• 期：39
• 页码：22560-22569
• 全文大小：543K
• ISSN：1932-7455

文摘

In this work, the reaction between H₂O₂ and tungsten powder in the presence of Tris(hydroxymethyl) aminomethane was studied experimentally. The production of hydroxyl radicals can be quantified indirectly by quantifying the scavenging product formaldehyde (CH₂O). XRD, XPS, and SEM analysis shows that no significant structural or compositional changes occur after reaction. We compared H₂O₂ consumption and CH₂O formation in both heterogeneous W_(s)/H₂O₂/Tris system and homogeneous W_(aq)/H₂O₂/Tris system. Increasing the amount of W powder leads to the increase in dissolution rate of W species, insignificant increase of H₂O₂ consumption rate and the decrease of final CH₂O production. By contrast, the consumption rate of H₂O₂ increases as increasing the concentration of dissolved W species. Based on the experimental results, a mechanism of H₂O₂ reacting with W powder in the presence of Tris is proposed. The mechanism well explained the relationship between surface reactions and homogeneous Haber鈥揥eiss peroxide chain breakdown.