Spatial Ensembles of Copper-Silica with Carbon Nanotubes as Ultrastable Nanostructured Catalysts for Selective Hydrogenation

Jianwei Zheng, Jianwei Zheng, Huihuang Fang, Xinping Duan, Haiqiang Lin, Yanhui Yang, Youzhu Yuan

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Catalyst deactivation is one of the most important issues in heterogeneous catalysis. Constructing a stable nanoscale structure that maintains efficient activity and prolonged stability under redox conditions for catalysis, particularly hydrogenation reactions, remains attractive albeit the flourishing nanoscience. This work presents a facile route to synthesize a semi-encapsulated transition metal by assembling three-dimensional transition metal silicate nanotubes onto carbon nanotubes (CNTs) as precursors. The obtained materials expose an active surface of the transition metal for efficient catalysis and form a specific structure to inhibit the migration of metal nanoparticles (NPs) by establishing strong metal-support interactions. Cu@SiO2 prepared by common precipitation shows an inferior activity, and its performance is easily attenuated because of the aggregation of Cu NPs. The addition of CNTs as a carrier doubles the intrinsic activity of Cu catalysts. This hybrid catalyst, which consists of Cu species, SiO2, and CNTs, is among the best catalysts for dimethyl oxalate hydrogenation with boosting activity of 25 h-1 and enhanced stability of more than 200 h.

Original languageEnglish
Pages (from-to)27268-27276
Number of pages9
JournalACS Applied Materials and Interfaces
Volume12
Issue number24
DOIs
StatePublished - 17 Jun 2020

Keywords

  • Cu catalyst
  • carbon nanotubes
  • hybrid
  • self-assemble
  • stability

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