Size-dependent strong metal-support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol
Size-dependent strong metal-support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol
复制标题
CO2 加氢制甲醇 Pd/ZnO 催化剂中尺寸依赖的强金属-载体相互作用
DOI：
10.1039/d1cy00606a
复制
发表时间：
2021
影响因子：
5
通讯作者：
Lu Junling
中科院分区：
文献类型：
--
作者：
Zhang Liangcai;Liu Xinyu;Wang Hengwei;Cao Lina;Huang Chenxi;Li Shang;Zhang Xiaohui;Guan Qiaoqiao;Shao Xiang;Lu Junling
强金属-载体相互作用在催化反应中的研究由来已久。合理利用SMSi效应不仅可以提高催化剂的稳定性，而且可以提高催化剂的活性和选择性。在本工作中，我们利用原子层沉积(ALD)技术合成了一系列Pd/ZnO催化剂，其Pd颗粒尺寸在1.6~7.9 nm之间。在高温下还原H2时，这些Pd/ZnO催化剂表现出与尺寸有关的SMSi效应，其中较大尺寸的Pd颗粒比较小尺寸的Pd颗粒更容易被ZnO包裹。在CO2加氢反应中，我们发现这种尺寸相关的SMSi，加上与尺寸相关的CO在Pd颗粒上的结合强度，为大于~2.5 nm的Pd颗粒提供了更高的活性和甲醇选择性。
Strong metal–support interaction (SMSI) has long been studied in catalytic reactions. Proper utilization of the SMSI effect might not only improve the stability of the catalysts, but also the activity and selectivity. In this work, using the atomic layer deposition (ALD) technique, we synthesized a series of Pd/ZnO catalysts with Pd particle sizes ranging from 1.6 to 7.9 nm. Upon H2 reduction at elevated temperatures, these Pd/ZnO catalysts display a size-dependent SMSI effect wherein the larger-size Pd particles are more prone to be encapsulated by ZnO compared to the smaller ones. In the reaction of CO2 hydrogenation, we show that such size-dependent SMSI, together with the size-related CO binding strength on Pd particles, provides a higher activity and methanol selectivity to the Pd particles larger than ~2.5 nm.