Ultrastable bimetallic catalyst with tuned surface electronic properties for highly selective oxidation of cyclohexane

Pingping Wu, Yunxiang Cao, Yue Wang, Wei Xing, Ziyi Zhong, Peng Bai*, Zifeng Yan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Well-dispersed Au-Pt (2–5 nm) and Au-Pd (1–5 nm) nanoparticles (NPs) supported on mesoporous silica (meso-SiO 2 ) were prepared by a facile one-pot synthesis method using 3-mercapto(propyl)trimethoxysilane (MPTMS) to anchor metal NPs to the support. The obtained catalysts were characterized and evaluated in cyclohexane oxidation with molecular oxygen. The bimetallic NPs catalysts prepared in this work exhibited a high stability with enhanced dispersion because of the intercalation of the metal alloy NPs in the meso-SiO 2 channels via the anchoring effect of MPTMS. The generation of surface Au δ− species in Au-Pt and Au-Pd catalysts was identified due to the alloying of Au with Pt and Pd. Although the electronic modification of Au atoms weakened the capability of Au for O 2 activation and leads to lower cyclohexane conversions on bimetallic catalysts, the deep oxidation reactions were reduced and a higher selectivity of desired products, K/A oil (cyclohexanol and cyclohexanone) was achieved. This work demonstrates an effective preparation method to improve the stability and surface chemical modification of Au NP catalysts, which provides general implications for other noble metal NPs catalysts.

Original languageEnglish
Pages (from-to)580-590
Number of pages11
JournalApplied Surface Science
Volume457
DOIs
StatePublished - 1 Nov 2018
Externally publishedYes

Keywords

  • Bimetallic catalyst
  • Cyclohexane oxidation
  • Noble metal nanoparticle
  • Surface electronic modification

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