Abstract

Palladium nanoparticles catalyze the reduction of Ag⁺ ions with hydrogen on their surface, thereby leading to the formation of bimetallic particles with the “core–shell” structure. The catalytic reaction of methylviologen reduction with hydrogen at ratio [Ag] : [Pd] > 1 is suppressed by silver atoms located on the surface of palladium nanoparticles. At [Ag] : [Pd] ≤ 1, the reduction takes place; however, it is preceded by an induction period, and, the higher the silver content on the nanoparticle surface, the longer the induction period. The rate constant of the catalytic reduction, which begins after the end of the induction period, decreases with increasing silver content on the surface of palladium nanoparticles.

中文翻译：

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Ag-Pd纳米颗粒的合成与表征：银对钯表面催化活性的抑制作用

摘要

钯纳米颗粒催化表面上的氢还原Ag ⁺离子，从而导致形成具有“核-壳”结构的双金属颗粒。钯纳米颗粒表面的银原子抑制了[Ag]：[Pd]> 1的氢气对甲基紫精的催化还原反应。当[Ag]：[Pd]≤1时，还原发生；然而，其之前是诱导期，并且纳米颗粒表面上的银含量越高，诱导期越长。在诱导期结束后开始的催化还原速率常数随钯纳米颗粒表面银含量的增加而降低。