Amphiphilic confined Pt-based nanocatalysts produced by atomic layer deposition with enhanced catalytic performance for biphasic reactions. Issue 20 (27th September 2021)

• Record Type: Journal Article
• Authors: Xing, Shuangfeng; Gao, Zhe; Zhao, Shichao; Xiong, Mi; Wang, Pengfei; Zhang, Jianyuan; Wang, Sen; Wang, Guofu; Qin, Yong
• Is Part Of: Green chemistry. Volume 23:Issue 20(2021)
• Page Start: 8116
• Page End: 8123
• Publication Date: 2021-09-27
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d1gc02261j
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Confined catalysts with different wettability microenvironments are designed. The amphiphilic microenvironment in nanochannels simultaneously promotes the transport of reactants to active sites and thus improves the performance in biphasic reactions. Abstract : With the ever-increasing awareness of environmental problems, the use of a green reaction medium in chemical processes has become an urgent research topic for green and sustainable chemistry. Developing excellent catalytic systems to ensure highly efficient molecular transport processes in reaction systems is still a challenge. Here, we introduce a facile template-assisted atomic layer deposition method to assemble amphiphilic confined TiO2 /Pt@CNT and hydrophilic confined TiO2 /Pt@TiO2 /CNT. For TiO2 /Pt@CNT, the void space between the outer TiO2 nanotube and the inner CNT forms an amphiphilic nanochannel. For TiO2 /Pt@TiO2 /CNT, a TiO2 layer is additionally deposited on CNTs. Furthermore, amphiphilic confined TiO2 @Pt/CNT and hydrophobic confined C@Pt/CNT with similar tube-in-tube structures are also prepared, and Pt nanoparticles are supported on CNTs. Compared with the hydrophilic/hydrophobic counterparts, amphiphilic confined nanocatalysts exhibit substantially enhanced performance in biphasic benzyl alcohol oxidation and phenol hydrogenation reactions. Detailed analyses reveal that the amphiphilic microenvironment in nanochannels simultaneously promotes the transport of biphasic reactants to Pt sites, and thus improves the catalytic performance. Our assembly strategy can be used to reveal the relationship between the wettability microenvironment and molecular transport in nanochannels, which provides guidance to develop high-performance catalysts for other reactions.