氢解
纳米团簇
催化作用
氢溢流
选择性
纳米颗粒
氢
材料科学
钌
化学
化学工程
无机化学
光化学
纳米技术
有机化学
工程类
作者
Hongyan Ji,Xiao Wang,Xiaoxu Wei,Yuxuan Peng,Shuaishuai Zhang,Shuyan Song,Hongjie Zhang
出处
期刊:Small
[Wiley]
日期:2023-04-25
卷期号:19 (35)
被引量:11
标识
DOI:10.1002/smll.202300903
摘要
Hydrogenolysis is an effective method for converting polyolefins into high-value chemicals. For the supported catalysts commonly used, the size of active metals is of great importance. In this study, it is discovered that the activity of CeO2 -supported Ru single atom, nanocluster, and nanoparticle catalysts shows a volcanic trend in low-density polyethylene (LDPE) hydrogenolysis. Compared with CeO2 supported Ru single atoms and nanoparticles, CeO2 -supported Ru nanoclusters possess the highest conversion efficiency, as well as the best selectivity toward liquid alkanes. Through comprehensive investigations, the metal-support interactions (MSI) and hydrogen spillover effect are revealed as the two key factors in the reaction. On the one hand, the MSI is strongly related to the Ru surface states and the more electronegative Ru centers are beneficial to the activation of CH and CC bonds. On the other hand, the hydrogen spillover capability directly affects the affinity of catalysts and active H atoms, and increasing this affinity is advantageous to the hydrogenation of alkane species. Decreasing the Ru sizes can promote the MSI, but it can also reduce the hydrogen spillover effect. Therefore, only when the two effects achieve a balance, as is the case in CeO2 -supported Ru nanoclusters, can the hydrogenolysis activity be promoted to the optimal value.
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