The effect of size-dependent nanoparticle energetics on catalyst sintering
The effect of size-dependent nanoparticle energetics on catalyst sintering
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DOI：
10.1126/science.1075094
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发表时间：
2002-10-25
期刊：
影响因子：
56.9
通讯作者：
Starr, DE
中科院分区：
文献类型：
--
作者：
Campbell, CT;Parker, SC;Starr, DE
金属吸附能的量热测量直接提供了负载型金属纳米粒子中金属原子的能量。随着金属覆盖率的增加，粒子长大，揭示了这种能量对粒子尺寸的依赖性，发现这种依赖性比通常的吉布斯 - 汤姆逊关系所预测的要强得多。结果表明，这一认识对于准确模拟催化剂中金属纳米粒子的长期烧结速率至关重要。
Calorimetric measurements of metal adsorption energies directly provide the energies of metal atoms in supported metal nanoparticles. As the metal coverage increases, the particles grow, revealing the dependence of this energy on particle size, which is found to be much stronger than predicted with the usual Gibbs-Thompson relation. It is shown that this knowledge is crucial to accurately model long-term sintering rates of metal nanoparticles in catalysts.